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Discussion Starter · #1 ·
As promised earlier, I have had a go at sorting the Dyno results available to me into meaningful categories which I have posted below. So far the runs are all on Maha rolling roads which is useful. It is worth noting that the cooling fans at Tuning Japanese are significantly more powerful than at Star Performance in Scotland and this may have an effect on the figures.

This thread is not intended to be "look at how good I am" but to allow us all to find the most effective tuning route for our future needs. Most of us spend lots of money and just hope that we chose well. This resource should with the help of others, allow much more accurate targeting of the goodies that are right for you.

I would like also like to include some more varied results, Rupert, can I have a copy of your recent T78 dyno sheet, Guy all your dyno runs from past / present cars would provide an important contribution. Gary, the Beast with it's 2835's would also be of great interest to all the members. Mario and Motorex do you have anything that we can post and do you know how to normalise the figures between your dyno and the UK Maha ones.

Anyone got some dyno info that is different to the ones posted will also be gratefully received. I seem to remember that Joss has some readings of his R34 as standard and then with an exhaust.

Don't be bashful as this will be of benefit to us all, as you can see from my results there is a big dip in power at 5800 RPM which I will be working on in the near future. Gary also stated that the beast is also still work in progress.

We all want the greatest bang for our bucks and I am sure that any conversations about tuning are good conversations as far as the garages are concerned.

Items that are also of interest as they play a significant role in the final output from your car are:- cam lift, cam duration, cam timing, head gasket thickness, air fuel ratio under load and maximum exhaust gas temperature taken before the turbo's.

I do not have much in the way of the set-up information for the dyno sheets posted but I would like to include a simple table on some or all of the above with each Dyno Sheet.

Mario posted on the downunder site that maximum power on his Skylines was produced at 12.666:1 Air / Fuel ratio and that he worked to a maximum of 1000°C before the turbos, to which I would say who are we to argue with someone of his obvious experience and quality of posting.

A big thanks to Tim at SVS for his contribution to help get the ball rolling.

Please E-Mail your Dyno Sheets and performance specification to h[email protected]
 

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Discussion Starter · #2 · (Edited)
Sorted by Maximum BHP

<tr />
<TABLE BORDER>
<TR><TD VALIGN=bottom NOWRAP>Max BHP</TD><TD VALIGN=bottom NOWRAP>Max Torque</TD><TD VALIGN=bottom NOWRAP>Torque</TD><TD VALIGN=bottom NOWRAP>Torque</TD><TD VALIGN=bottom NOWRAP>Torque</TD><TD VALIGN=bottom NOWRAP>Avg Boost </TD><TD VALIGN=bottom NOWRAP>Turbo</TD><TD VALIGN=bottom NOWRAP>Cams</TD><TD VALIGN=bottom NOWRAP>ECU</TD><TD VALIGN=bottom NOWRAP>Tuner</TD><TD VALIGN=bottom NOWRAP>Dyno</TD><TD VALIGN=bottom NOWRAP>Reference </TD></TR>
<TR><TD VALIGN=bottom NOWRAP>@RPM </TD><TD VALIGN=bottom NOWRAP>@RPM</TD><TD VALIGN=bottom NOWRAP>@ 4000</TD><TD VALIGN=bottom NOWRAP>@ 3000</TD><TD VALIGN=bottom NOWRAP>@ 2000</TD><TD VALIGN=bottom NOWRAP>in Bar </TD></TR>
<TR></TR>
<TR><TD VALIGN=bottom NOWRAP>444 @ 7790</TD><TD VALIGN=bottom NOWRAP>349 @ 5610</TD><TD ALIGN=right VALIGN=bottom NOWRAP>212</TD><TD ALIGN=right VALIGN=bottom NOWRAP>134</TD><TD ALIGN=right VALIGN=bottom NOWRAP>108</TD><TD ALIGN=right VALIGN=bottom NOWRAP>1.35</TD><TD VALIGN=bottom NOWRAP>Nismo Le Mans </TD><TD VALIGN=bottom NOWRAP>Trust 256/264 </TD><TD VALIGN=bottom NOWRAP>Top Secret </TD><TD VALIGN=bottom NOWRAP>Trust</TD><TD VALIGN=bottom NOWRAP>Maha</TD><TD VALIGN=bottom NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Tim%20SVS%20134.htm">Tim SVS R33 # 2 </A></TD></TR>
<TR><TD VALIGN=bottom NOWRAP>339 @ 7720</TD><TD VALIGN=bottom NOWRAP>259 @ 7720</TD><TD ALIGN=right VALIGN=bottom NOWRAP>215</TD><TD ALIGN=right VALIGN=bottom NOWRAP>134</TD><TD ALIGN=right VALIGN=bottom NOWRAP>106</TD><TD ALIGN=right VALIGN=bottom NOWRAP>0.7</TD><TD VALIGN=bottom NOWRAP>Nismo Le Mans </TD><TD VALIGN=bottom NOWRAP>Trust 256/264 </TD><TD VALIGN=bottom NOWRAP>Top Secret </TD><TD VALIGN=bottom NOWRAP>Trust</TD><TD VALIGN=bottom NOWRAP>Maha</TD><TD VALIGN=bottom NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Tim%20SVS%2007.htm">Tim SVS R33 # 1 </A></TD></TR>
<TR><TD VALIGN=bottom NOWRAP>457 @ 7880</TD><TD VALIGN=bottom NOWRAP>363 @ 5660</TD><TD ALIGN=right VALIGN=bottom NOWRAP>228</TD><TD ALIGN=right VALIGN=bottom NOWRAP>137</TD><TD ALIGN=right VALIGN=bottom NOWRAP>107</TD><TD ALIGN=right VALIGN=bottom NOWRAP>1.4</TD><TD VALIGN=bottom NOWRAP>Nismo Le Mans </TD><TD VALIGN=bottom NOWRAP>Trust 256/264 </TD><TD VALIGN=bottom NOWRAP>Top Secret </TD><TD VALIGN=bottom NOWRAP>Trust</TD><TD VALIGN=bottom NOWRAP>Maha</TD><TD VALIGN=bottom NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Tim%20SVS%2014.htm">Tim SVS R33 # 3 </A></TD></TR>
<TR><TD VALIGN=bottom NOWRAP>383 @ 7560</TD><TD VALIGN=bottom NOWRAP>270 @ 6480</TD><TD ALIGN=right VALIGN=bottom NOWRAP>238</TD><TD ALIGN=right VALIGN=bottom NOWRAP>155</TD><TD ALIGN=right VALIGN=bottom NOWRAP>114</TD><TD ALIGN=right VALIGN=bottom NOWRAP>0.95</TD><TD VALIGN=bottom NOWRAP>Std</TD><TD VALIGN=bottom NOWRAP>Std</TD><TD VALIGN=bottom NOWRAP>Std</TD><TD VALIGN=bottom NOWRAP>None</TD><TD VALIGN=bottom NOWRAP>Maha</TD><TD VALIGN=bottom NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Hugh%20095.htm">Hugh R34 standard </A></TD></TR>
<TR><TD VALIGN=bottom NOWRAP>383 @ 7390</TD><TD VALIGN=bottom NOWRAP>299 @ 7390</TD><TD ALIGN=right VALIGN=bottom NOWRAP>282</TD><TD ALIGN=right VALIGN=bottom NOWRAP>153</TD><TD ALIGN=right VALIGN=bottom NOWRAP>90</TD><TD ALIGN=right VALIGN=bottom NOWRAP>0.9</TD><TD VALIGN=bottom NOWRAP>Std</TD><TD VALIGN=bottom NOWRAP>Std</TD><TD VALIGN=bottom NOWRAP>Middlehurst</TD><TD VALIGN=bottom NOWRAP>Charlie</TD><TD VALIGN=bottom NOWRAP>Maha</TD><TD VALIGN=bottom NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Charlie%2009.htm">Charlie R33 standard</A></TD></TR>
<TR><TD VALIGN=bottom NOWRAP>493 @ 6650</TD><TD VALIGN=bottom NOWRAP>441 @ 5830</TD><TD ALIGN=right VALIGN=bottom NOWRAP>323</TD><TD ALIGN=right VALIGN=bottom NOWRAP>212</TD><TD ALIGN=right VALIGN=bottom NOWRAP>135</TD><TD ALIGN=right VALIGN=bottom NOWRAP>1.41</TD><TD VALIGN=bottom NOWRAP>HKS GT 2530</TD><TD VALIGN=bottom NOWRAP>HKS step 1</TD><TD VALIGN=bottom NOWRAP>FCon-V</TD><TD VALIGN=bottom NOWRAP>None</TD><TD VALIGN=bottom NOWRAP>Maha</TD><TD VALIGN=bottom NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Hugh%2014.htm">Hugh R34 modified </A></TD></TR>
<TR><TD VALIGN=bottom NOWRAP>453 @ 7320</TD><TD VALIGN=bottom NOWRAP>355 @ 5740</TD><TD ALIGN=right VALIGN=bottom NOWRAP>337</TD><TD ALIGN=right VALIGN=bottom NOWRAP>235</TD><TD ALIGN=right VALIGN=bottom NOWRAP>120</TD><TD ALIGN=right VALIGN=bottom NOWRAP>1.11</TD><TD VALIGN=bottom NOWRAP>Std + steel internal</TD><TD VALIGN=bottom NOWRAP>HKS step 1</TD><TD VALIGN=bottom NOWRAP>Apexi PFC</TD><TD VALIGN=bottom NOWRAP>Rod Bell</TD><TD VALIGN=bottom NOWRAP>Maha</TD><TD VALIGN=bottom NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Keith%20111.htm">Keith R33 modified </A></TD></TR>
</TABLE>
 

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Discussion Starter · #3 ·
Sorted by Torque at 4000 RPM

</tr>
<TABLE BORDER>
<TR><TD VALIGN=top NOWRAP>Max BHP</TD><TD VALIGN=top NOWRAP>Max Torque</TD><TD VALIGN=top NOWRAP>Torque</TD><TD VALIGN=top NOWRAP>Torque</TD><TD VALIGN=top NOWRAP>Torque</TD><TD VALIGN=top NOWRAP>Avg Boost </TD><TD VALIGN=top NOWRAP>Turbo</TD><TD VALIGN=top NOWRAP>Cams</TD><TD VALIGN=top NOWRAP>ECU</TD><TD VALIGN=top NOWRAP>Tuner</TD><TD VALIGN=top NOWRAP>Dyno</TD><TD VALIGN=top NOWRAP>Reference </TD></TR>
<TR><TD VALIGN=top NOWRAP>@RPM </TD><TD VALIGN=top NOWRAP>@RPM</TD><TD VALIGN=top NOWRAP>@ 4000</TD><TD VALIGN=top NOWRAP>@ 3000</TD><TD VALIGN=top NOWRAP>@ 2000</TD><TD VALIGN=top NOWRAP>in Bar </TD></TR>
<TR></TR>
<TR><TD VALIGN=top NOWRAP>444 @ 7790</TD><TD VALIGN=top NOWRAP>349 @ 5610</TD><TD ALIGN=right VALIGN=top NOWRAP>212</TD><TD ALIGN=right VALIGN=top NOWRAP>134</TD><TD ALIGN=right VALIGN=top NOWRAP>108</TD><TD ALIGN=right VALIGN=top NOWRAP>1.35</TD><TD VALIGN=top NOWRAP>Nismo Le Mans </TD><TD VALIGN=top NOWRAP>Trust 256/264 </TD><TD VALIGN=top NOWRAP>Top Secret </TD><TD VALIGN=top NOWRAP>Trust</TD><TD VALIGN=top NOWRAP>Maha</TD><TD VALIGN=top NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Tim%20SVS%20134.htm">Tim SVS R33 # 2 </A></TD></TR>
<TR><TD VALIGN=top NOWRAP>339 @ 7720</TD><TD VALIGN=top NOWRAP>259 @ 7720</TD><TD ALIGN=right VALIGN=top NOWRAP>215</TD><TD ALIGN=right VALIGN=top NOWRAP>134</TD><TD ALIGN=right VALIGN=top NOWRAP>106</TD><TD ALIGN=right VALIGN=top NOWRAP>0.7</TD><TD VALIGN=top NOWRAP>Nismo Le Mans </TD><TD VALIGN=top NOWRAP>Trust 256/264 </TD><TD VALIGN=top NOWRAP>Top Secret </TD><TD VALIGN=top NOWRAP>Trust</TD><TD VALIGN=top NOWRAP>Maha</TD><TD VALIGN=top NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Tim%20SVS%2007.htm">Tim SVS R33 # 1 </A></TD></TR>
<TR><TD VALIGN=top NOWRAP>457 @ 7880</TD><TD VALIGN=top NOWRAP>363 @ 5660</TD><TD ALIGN=right VALIGN=top NOWRAP>228</TD><TD ALIGN=right VALIGN=top NOWRAP>137</TD><TD ALIGN=right VALIGN=top NOWRAP>107</TD><TD ALIGN=right VALIGN=top NOWRAP>1.4</TD><TD VALIGN=top NOWRAP>Nismo Le Mans </TD><TD VALIGN=top NOWRAP>Trust 256/264 </TD><TD VALIGN=top NOWRAP>Top Secret </TD><TD VALIGN=top NOWRAP>Trust</TD><TD VALIGN=top NOWRAP>Maha</TD><TD VALIGN=top NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Tim%20SVS%2014.htm">Tim SVS R33 # 3 </A></TD></TR>
<TR><TD VALIGN=top NOWRAP>383 @ 7560</TD><TD VALIGN=top NOWRAP>270 @ 6480</TD><TD ALIGN=right VALIGN=top NOWRAP>238</TD><TD ALIGN=right VALIGN=top NOWRAP>155</TD><TD ALIGN=right VALIGN=top NOWRAP>114</TD><TD ALIGN=right VALIGN=top NOWRAP>0.95</TD><TD VALIGN=top NOWRAP>Std</TD><TD VALIGN=top NOWRAP>Std</TD><TD VALIGN=top NOWRAP>Std</TD><TD VALIGN=top NOWRAP>None</TD><TD VALIGN=top NOWRAP>Maha</TD><TD VALIGN=top NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Hugh%20095.htm">Hugh R34 standard </A></TD></TR>
<TR><TD VALIGN=top NOWRAP>383 @ 7390</TD><TD VALIGN=top NOWRAP>299 @ 7390</TD><TD ALIGN=right VALIGN=top NOWRAP>282</TD><TD ALIGN=right VALIGN=top NOWRAP>153</TD><TD ALIGN=right VALIGN=top NOWRAP>90</TD><TD ALIGN=right VALIGN=top NOWRAP>0.9</TD><TD VALIGN=top NOWRAP>Std</TD><TD VALIGN=top NOWRAP>Std</TD><TD VALIGN=top NOWRAP>Middlehurst</TD><TD VALIGN=top NOWRAP>Charlie</TD><TD VALIGN=top NOWRAP>Maha</TD><TD VALIGN=top NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Charlie%2009.htm">Charlie R33 standard</A></TD></TR>
<TR><TD VALIGN=top NOWRAP>493 @ 6650</TD><TD VALIGN=top NOWRAP>441 @ 5830</TD><TD ALIGN=right VALIGN=top NOWRAP>323</TD><TD ALIGN=right VALIGN=top NOWRAP>212</TD><TD ALIGN=right VALIGN=top NOWRAP>135</TD><TD ALIGN=right VALIGN=top NOWRAP>1.41</TD><TD VALIGN=top NOWRAP>HKS GT 2530</TD><TD VALIGN=top NOWRAP>HKS step 1</TD><TD VALIGN=top NOWRAP>FCon-V</TD><TD VALIGN=top NOWRAP>None</TD><TD VALIGN=top NOWRAP>Maha</TD><TD VALIGN=top NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Hugh%2014.htm">Hugh R34 modified </A></TD></TR>
<TR><TD VALIGN=top NOWRAP>453 @ 7320</TD><TD VALIGN=top NOWRAP>355 @ 5740</TD><TD ALIGN=right VALIGN=top NOWRAP>337</TD><TD ALIGN=right VALIGN=top NOWRAP>235</TD><TD ALIGN=right VALIGN=top NOWRAP>120</TD><TD ALIGN=right VALIGN=top NOWRAP>1.11</TD><TD VALIGN=top NOWRAP>Std + steel internal</TD><TD VALIGN=top NOWRAP>HKS step 1</TD><TD VALIGN=top NOWRAP>Apexi PFC</TD><TD VALIGN=top NOWRAP>Rod Bell</TD><TD VALIGN=top NOWRAP>Maha</TD><TD VALIGN=top NOWRAP><A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Keith%20111.htm">Keith R33 modified </A></TD></TR>
</TABLE>
 

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dyno runs

dont start the dyno at tuning japanese is set to take about 30 sec to do a run. the one at star is set at 60 sec, so the heat on the cars at star were a lot more hotter than the cars at tuning japanese.
the dyno took a reading at the air filters then the dyno worked out the power from that .at star they dont do much work to turbo cars so they dont need to do short runs.
so he was told by maha to let the dyno work out the power that way rather than change the software.

jim from star spoke to tim from tuning japanese about the time
the runs take.

if you want to see power loss go back to tuning japanese and
get tim to run your car for 1 min then see your power because at the end of my dyno run the charge temp in the intercooler was 57 deg.
on the road flat in 3rd no more than 28 deg.

you always get one smart arse
 

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Discussion Starter · #6 ·
Message length

Sorry to say I cannot update the latest dyno figures as the maximum file size has been cut in half since yesterday.

I have prepared additional information supplied by Peter E and by Mike Smith which due to the above change, I am at this time unable to upload.

Has this post been sabotaged?

If it has, WHY?

Joss, if you have control of this, can you explain what has happened.
 

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Chill

Hugh.

Joss is the only one with access to modifying this site. I think :confused: . But Joss wouldn't screw with anything. Probably some gremlins in their somewhere.

glen.
 

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Limited !!

Guy's

I think Joss did tweak the site limiting the size of the signiture attachments
as the sierra boys were overloading things with their evil properganda.:rolleyes: :rolleyes:

Maybe that is causing it. :confused: :confused:
 

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Discussion Starter · #10 · (Edited)
Guy Ratcliffe, Rupert and Gary Passingham sheets added

Sorry about the quality of the text, but it's the only way I know of to get round the numeric character limit that has been introduced.

Click on the links above to see the Dyno sheet details.

The above information can be seen more clearly at <A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/"> Dyno Comparison Figures </a></td>

<tr />
<br />
<img src="http://www.sol.co.uk/h/hugh/Dyno%20Runs/index.gif"
<br />
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Tim%20SVS%2007.htm"> Tim SVS R33 # 1
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Charlie%2009.htm"> Charlie R33 standard
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Hugh%20095.htm"> Hugh R34 standard
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Tim%20SVS%20134.htm"> Tim SVS R33 # 2
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Keith%20111.htm"> Keith R33 modified
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Tim%20SVS%2014.htm"> Tim SVS R33 # 3
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Hugh%2014.htm"> Hugh R34 modified
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/MikeSmith%20102.htm"> Mike Smith R33 modified
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/PeterE%20.975.htm"> PeterE R33 modified
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/ScottMartin08.htm>Scott Martin R32 standard
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Guy123.htm"> Guy R33 modified
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Guy125.htm"> Guy R33 modified # 2
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Guy141.htm"> Guy R34 modified
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Rupert16.htm"> Rupert R33 modified
<A HREF = "http://www.sol.co.uk/h/hugh/Dyno%20Runs/View%20Pages/Gary183.htm"> Gary GT-art R33 "The Beast" </a></td>

The last three sheets can be seen at the web site of <A HREF = "http://www.tuning-japanese.co.uk/"> Tuning Japanese </a></td> where more details of their rolling road and tuning services can also be found.
 

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Dyno's

Hello all,

There is a significant difference between dynos in the UK and Australia. The defacto standard here in Australia for 4WD dynos is Dyno Dynamics, which have a reputation for reading very low.

Do your dynos give you PAW (Power At the Wheels) or do they try to guesstimate the driveline losses and present you with a crank power estimate?

A stock R33 GTR on average records about ~140kW (~190 HP) at all four wheels in 4th gear. I record the power loss through the drivetrain (on GTR's on a Dyno Dynamics unit in 4th upto 8,000rpm) to be roughly ~100kW.

So the average R33 records an estimated flywheel power of ~240kW (~320 HP).

I hope this helps some,

Mario.
 

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Discussion Starter · #12 ·
Power At the Wheels

Mario

The dyno prints also show power at the wheels - the blue line and blue numbers.

The green line shows the estimated transmission losses when coasting back down to idle speed.

The red line shows estimated engine BHP to DIN standard
 

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file size

I have not changed the text post limit which is 5,000 characters... I've raised it to 7,500 to help.

I have reduced the max size of images and the byte size they can have ... this is because the site is uploading close to my max free amount of 3Gigabytes per month .. after that *I* get charged a fortune ... so if pics are smaller, downloads are less.

e.g. that .gif file is 287K, so if 50 people look at it, that's 14 mega bytes uploaded, whereas if it were text, it would be a few K.

To be honest, the better places for big pics is on the site proper, where I can optimise everything and it's easier to find ... If you'd like me to do that, email me [email protected] and send pics, text, etc. and when I next do the site, I'll put it up (normally Saturday morning)

Cheers
 

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Dyno sheet

Hello all,

I'm not sure if this will work, as this message board always seems to stuff up on me, but here goes anyway:

I have upped some dyno sheets (into my site). They're not the very big ones - but some that might be of interest. The R34 one is very interesting, as it shows the differences with the Power FC, AVC-R and vernier cam wheels.

Mario.
www.exvitermini.com
 

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Discussion Starter · #15 ·
Dodgy calculations

Here goes, this is all a bit ropey but I have had a go at translating one of Mario's Dyno sheets into something more familiar.

Talk about a different way of judging performance, none of the units of measure are the same.

The hardest to compare to the Maha dyno runs that have previously been posted is the torque which on Mario's sheet is rated in Newton's, at first I thought it was really Newton / Metres, but the figures looked a bit suspect.

I then checked out some Dyno Dynamics WEB sites and found this conversion for one of their Dyno's:- Maximum Tractive Effort - 16,000 (N) 3700 (lb) Maximum Roller Torque - 1800 (NM) 1300 (ft. lb) at http://www.cybermatic.com/dynoshop/850specs.htm . I then applied the ratio of 16,000 Newton's = 1300 ft lb / to the sheet. The figures still look crazy with Rupert's engine torque of 476 and Gary's engine torque of 503 and Mario's wheel torque of 840 ft lbs, it's got to be out by miles.

The next difference is the wheel speed instead of engine RPM, I assumed a tyre size of 245 / 40 / 18 which = a tyre dia of 25.7", a third gear ratio of 1.302 and a diff ratio of 4.111 to calculate back the speed into RPM. There will be some tyre slippage which I have ignored. Again the RPM's on the sheet look less than we typically see - what do you think?

Kilowatts to BHP should be easy and I used the ratio of 1kw = 1.34 BHP, but then I noticed it's at the wheels.

Looking at Rupert's wheel HP of what looks like 473 and engine BHP of 630 and Gary's 493 and 648 I derived an average conversion of 1.323163 which I then applied to Mario's 550 BHP, to get a maximum estimated engine output of 728BHP.

Mario / anyone else let me know where the mistakes are, I am sure that I have made several assumptions too many.

See http://www.sol.co.uk/h/hugh/Dyno Runs/photos/Mario18.jpg for a laugh.
 

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Power

I placed two dyno sheets onto the site, the 415kW @ 1.8 Kg/cm2 (~555 HP) and the 450kW @ 2.0 Kg/cm2 (~600 HP) ones.

Those figures are at the wheels and there was always wheelspin. It is simply not possible to obtain an accurate figure when pushing that much power through the drivetrain (as the wheelspin means that the dyno will plot the tractive effort at a lower speed, hence lower power figures will be provided).

In some cases, wheel speed was out of line with the roller speed by over 40km/h (~25 mph). We know this to be correct, as prior to the power runs, we ran without boost and verified that the dyno roller speed matched the wheel speed, upto redline.

Then there is also the issue of intercooling being far less efficient due to lack of airflow through the core as opposed to when the car is in motion (not to mention the sheer amount of air that the engine breathes is severely limited in a workshop environment).

Guy: I was using the 2835R turbos - not 2835. They're very different turbos, the little 'R' at the end implies more than just a few thousand yen price difference.

Peak power was made at something like 8250, I believe, with peak torque being made 7750 or so. As I said, it is very difficult to know exactly due to the chronic wheelspin.

Either way, we know that the car was making way more power than the dyno was reporting, and I'd much rather quote lower figures than overestimate the cars potential (ergo not quoting the maximum power outputs it made).

Hugh: Tyre size used on those runs was 265/40/18.

I hope that helps some.

Mario.
 

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Mario,

Could you ( or anyone else that knows ) give me a run down of what the differences are with the 2835R's as opposed to the standard Turbos and the performance advantages ?

Thanks :D
 

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Thanks Guy,

I meant in comparison with the 2835's.

Is there an 'R' spec for each size of Turbo or is this just on the 2835's ?

I don't know if I want to go that big but would like the best Turbo's I can get once I decide on my target BHP.

By best I mean least lag and most boost for their size :)

Cheers
 

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Jez

HKS have various turbo configurations, all exclusives, that are not available to purchase from Garrett. Further, they make their own exhaust and compressor housings to suit the Garrett cores and wheels.

They have two additional range specs, apart from their normal line-up, and these are the 'S' and 'R' series turbos. The Pro series is just a **** - so it isn't even worth describing here.

Both the 'S' and 'R' denote that the turbo has been modified to use an alternate cut of compressor wheel, as well as a specially modified compressor housing (usually the inlet has been enlarged).

As in the 2835 to 2835R, the inlet goes from 70mm to 100mm, respectively. That in itself is a huge difference - then take into account the modifed exhaust housings (about 2mm larger exhaust wheel outlet with a 90 trim wheel on the R spec, as opposed to an 84 trim wheel on the standard 2835).

Basically, the difference is massive. You can expect around 700-750 HP from the 2835 (in the largest size) and 800-850 HP from the 2835R.

This is at sane boost levels and efficiencies, as it is possible to push the turbos harder (to which the R responds much better, as it is a larger and more efficient compressor) and I know you can get 900 HP out of them - but your intercooling had better be damn good.

FYI:

2540 and 2540R
2835 and 2835R
3037 and 3037S
3540 and 3540R

...and a few others I can't disclose... ;)

Mario.
 

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Thanks for the info :D

How does the different layout of the 'R' blowers affect lag and how much more do they cost than the normal turbo's ?
 
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