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View Poll Results: -7 or -5 turbos?
-5 for power - gimme gimme gimme! 141 58.26%
-7 for spool-up - it's a street car after all! 101 41.74%
Voters: 242. You may not vote on this poll

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Old 10th September 2011, 06:40 PM   #181 (permalink)
Taven888 is yo
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were as i hate dyno dynamics!

Same day, car ran

Area 52 dyno dynamics
476bhp

Noble Motersport Mahal Rollers
472bhp

Same Day.
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Old 11th September 2011, 04:48 PM   #182 (permalink)
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I thought that the point of 7s was to spool up quicker .

If they cant do that then there is surelly no point in having them because you will never get 5s power (regardless of what dyno's reading you decide to use)

If we are to compare them obviously power is important but torque is king.

Personally I think that your graph is an advert for 5s not 7s
Using your chosen dyno chart you have 350 ft lbs at 4500 with max torque of 380.

My rb 26 which has roughly the same mods but with 5s produces loads more torque at all levels and seems to spool up quicker ???



And my graph isnt anything special for 5s

(If you want to compare exactly to compare the ft lbs take the reading and divide by the gear ratio)
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Last edited by RSVFOUR; 11th September 2011 at 05:01 PM..
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Old 11th September 2011, 06:02 PM   #183 (permalink)
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Weres the boost?

Just to add i dident choose -7s
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Old 12th September 2011, 12:02 AM   #184 (permalink)
RSVFOUR is has actually finished his 32GTR
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boost is a bit of a red herring in the spool up department because both of my 5s settings seem to spool up at least as quick as both of yours with 7s

BTW Im only commenting on the figures you posted - All the other 7s graphs I have ever seen boost up faster than 7s but give less power - thats fine if thats what you want

And I will repat ny personal opinion that if 7s dont spool up quicker than 5s the to me , there is no point in looking at them.
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Old 12th September 2011, 04:46 PM   #185 (permalink)
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My spool could be affected by the cams tho
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Old 14th September 2011, 09:35 AM   #186 (permalink)
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has anyone measured any backpressures when using -5's?? Would be interesting to see their relationship against boost.
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Old 17th September 2011, 10:30 PM   #187 (permalink)
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i havent
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Old 18th September 2011, 01:35 AM   #188 (permalink)
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Quote:
Originally Posted by Taven888 View Post
My spool could be affected by the cams tho
very true although they are very similar to mine running 5s so maybe they dont match well with the 7s
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Old 22nd May 2012, 08:35 PM   #189 (permalink)
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Quote:
Originally Posted by Taven888 View Post
little boost increase and +2 degrees timing. DOTTED lines was previous.




backed feul reg off to take some feul out.



and BOOOOOOM .........................
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Old 22nd May 2012, 08:42 PM   #190 (permalink)
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heres a graph for a well specced engine on -5s
1.2 bar of boost, dyno dynamics, ported head and stage 1 cams, massive trust intercooler and 660cc densos flat out

flywheel power its dyno dynamics so you can be sure it wont be inflated



and afr and boost, and showing wheel hp



i dont have it anymore but i trapped 123 mph at santa pod on a far from perfect run, it was a good engine.
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Old 22nd May 2012, 09:37 PM   #191 (permalink)
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Your a funny guy!
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Old 2nd June 2012, 05:34 PM   #192 (permalink)
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thought id add my latest dyno graph, different car to above though.
spec is.
je pistons
550 cc injectors
stock afms
stock fuel pump rewired
-7s
stock cams and ports afaik
stock intercooler



this tune was done last week, the dyno cell was 34 degrees, acts peaked at 48 degrees.

that is hub power at 1.4 bar spike, 1.2 bar held.
11.8 afr on my wideband
max 48 degrees timing on pfc
550c injectors so far ive seen 80% duty, will be in the 80s in fifth gear.
afm volts showing 5150 so flat out lol, i have nismo afms to go on it if i push it further.
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Old 28th June 2012, 10:00 PM   #193 (permalink)
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As said earlier above with 5s producing better spool then 7s, would 5s spool quicker than 7s on the same car, same engine, cams, headwork? I would go for 5s for more power with similar spool it seems.
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Old 12th July 2012, 12:33 PM   #194 (permalink)
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Out of interest, how long does your tuners take to do a full tune (not retune)

I'm seeing some inconsistent boost pressures and wobbly graphs. No full tune can be done in 1 or even 2 full days.
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Old 13th July 2012, 12:19 AM   #195 (permalink)
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My tuning has always taken a full day but a lot of that time is letting the engine cool down after blasting it
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Old 13th July 2012, 08:48 AM   #196 (permalink)
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If you have seen the perimeters of what a full tune needs and you could appreciate what it takes to fill out each individual box then you should know that there is not enough time in a full day to tune a car, and thats on a small map of a power FC.

Its become common practice among tuners to map cars in blocks as opposed to each individual point. I would love to see a tuner chime in here, perhaps even a screen shot of their maps.
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Old 2nd October 2012, 09:39 AM   #197 (permalink)
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Which turbo is better? the -7's or the -9's?

My GTR will be daily driven on the street, it will probably see a track but not for quite a while.

Its just my fun daily for now
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Old 2nd October 2012, 04:37 PM   #198 (permalink)
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Neither ! Dash 5's are what the factory should have put on all the cars in the first place. Then if anyone decided to change the turbos they would only make the cars perform poorly or have less power or less enjoyable to drive in traffic. Then the debate would be which is better , "Dash 5's or dash 10's " because dash 7's and 9's are not even in the running. I drive mine daily to and from work 45 min each way and clock up unreal mileage then rebuild the engine and do it again.
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Old 2nd October 2012, 06:52 PM   #199 (permalink)
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I have had Dash 5 turbos in most of the common configurations, on a factory engine then with Jun Stage 2 cams and titanium valve parts and Manley inconel valves , before and after porting ,with stock boost with / then without the restrictor / then full blast and all you can get from the dash 5 , stock engine internals then not, stock red line then redline at 9,500, RB26 up to RB28, without and with Methanol injection. My engine now costs more than most peoples cars and EVERYWHERE in the process the dash 5 was the better and more enjoyable all round best twin set-up. If it wasn't for a mistake that I made i would have been on my way to putting 80 - 90,000 km a yr on the car. Dash 5's rule for best overal, I can't even see how there is a debate going on ?
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Old 2nd October 2012, 07:46 PM   #200 (permalink)
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-5

go for -5
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