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View Poll Results: -7 or -5 turbos?
-5 for power - gimme gimme gimme! 139 59.66%
-7 for spool-up - it's a street car after all! 94 40.34%
Voters: 233. You may not vote on this poll

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Old 21st March 2010, 10:05 AM   #136 (permalink)
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Originally Posted by scoooby slayer View Post
how is that possible on 550 cc injectors ? im running around 500 whp and on the absolute limit of 660 densos with base pressure at 3.5 bar aswell.
Leaner tune I'd imagine
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Old 21st March 2010, 10:21 AM   #137 (permalink)
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Leaner tune I'd imagine
but how lean can it be im at 11.4 at the limiter, surely he cant be much above 12 ? i just dont see how 514 awhp is possible, thats 600hp+ on 550cc, possibly an optimistic dyno ?
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Old 21st March 2010, 07:22 PM   #138 (permalink)
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but how lean can it be im at 11.4 at the limiter, surely he cant be much above 12 ? i just dont see how 514 awhp is possible, thats 600hp+ on 550cc, possibly an optimistic dyno ?
It's a Dynapack (Hub Dyno) so no, not optimistic at all, One of the most accurate dyno's on the planet!

I am running a fair wack of fuel pressure on a big pump.....It is getting very high in injector duty and I do need to replace them with some 700's.

....Gibson GTR's were 740hp in quali trim with 550cc injectors....
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Old 3rd April 2010, 04:58 PM   #139 (permalink)
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Personally I think it has to be 5s

Just over 500 at the hubs (abbey) at 1.5 bar with more if I want to do some headwork . This is with tomei cams 700 injectors an Fcon V pro gold (no afms) and a good map
highest boost tried was 1.5 bar but even at 1.3 its pretty interesting

What I like most about 5s is the torque - nearly 500 ft lbs at 4500rpm (well 488) and it stays there.

Dont think sevens will produce that



Not bad for an estate car
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Old 3rd April 2010, 08:19 PM   #140 (permalink)
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Personally I think it has to be 5s

Just over 500 at the hubs (abbey) at 1.5 bar with more if I want to do some headwork . This is with tomei cams 700 injectors an Fcon V pro gold (no afms) and a good map
highest boost tried was 1.5 bar but even at 1.3 its pretty interesting

What I like most about 5s is the torque - nearly 500 ft lbs at 4500rpm (well 488) and it stays there.

Dont think sevens will produce that



Not bad for an estate car
That is very similar to mine, same turbos and cams, on the same dyno....

....You are just running more sensible injectors!
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Old 3rd April 2010, 08:46 PM   #141 (permalink)
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torque curve looks a lot different to me mabe thats the f con and map
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Old 4th April 2010, 12:54 AM   #142 (permalink)
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Didn't think it was much different....You have peak about 500rpm lower
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Old 6th April 2010, 10:09 PM   #143 (permalink)
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Honest to god, these cars should have come from the factory with -5's. They are perfect for lower to mid horsepower. I had dash 10***8217;s for 4 months and really didn***8217;t like them and took them off. They are now collecting dust in the garage. Dash 7***8217;s would be not enough in my opinion. Hell right now due to mods and changes, I***8217;m not running any boost controls (gate pressure) and dash 5***8217;s are still fun.
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Old 6th April 2010, 11:31 PM   #144 (permalink)
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Honest to god, these cars should have come from the factory with -5's. They are perfect for lower to mid horsepower. I had dash 10ís for 4 months and really didnít like them and took them off. They are now collecting dust in the garage. Dash 7ís would be not enough in my opinion. Hell right now due to mods and changes, Iím not running any boost controls (gate pressure) and dash 5ís are still fun.
did u have your -10s on a 2.6ltr?
i ran hks gtrs on my previous 2.6ltr & it was very laggy, the hks gtss were much better!
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Old 6th April 2010, 11:36 PM   #145 (permalink)
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-7s feel to me like what GTRs should have come out with factory, I reckon -5s feel more like a "street tuned" setup - driveable and responsive but still laggier than I would call a production type setup, but man they can wake up and bugger off when you let them get on steam
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Old 7th April 2010, 04:33 AM   #146 (permalink)
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-7s feel to me like what GTRs should have come out with factory, I reckon -5s feel more like a "street tuned" setup - driveable and responsive but still laggier than I would call a production type setup, but man they can wake up and bugger off when you let them get on steam
If the -5's were to come out factory....You would be best also having some 260deg cams too.

....I know they are probably going to bee too small, but I will be interested to try my -5's and 260cams in a RB30.
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Old 7th April 2010, 03:06 PM   #147 (permalink)
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My engine was totally rebuilt ($21,000 CDN) with the head done by JUN. I have a ported head with the JUN 264 / 10.5 stage II cams. Really nice head setup. When I had the dash 10's on I was also running Methanol injection. The Meth had 30% water and that got the turbines going sooner then usual. I didn't like the Methanol injection set up I had so I ripped it all out and the boost controls too. I just didn't think it was going to take me so lone to get it all back together the way I wanted it. I ended up working on the house and that project swelled.
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Old 20th April 2010, 02:53 AM   #148 (permalink)
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ya -5s must be nice to have!
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Old 24th April 2010, 05:22 AM   #149 (permalink)
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I'm running only on gate pressure but still it has lots of poop ! That's why I had the opinion that if the car came from the factory with them on and vertually no boost it still had more HP than the crap that came from the factory. My OEM turbos had multiple problems with them. The oil seals on the compressor side were hooped and they also sent oil inot the exhaist and they had great huge cracks right across the the waste gate side of the housing. Did I mention they had 60,000 km on them. Just crap !
I liked the methanol injection but my tank was in the trunk in the spare tire well and it made me nervous having that kind of fuel in the "passanger comparment" when I have my kids seats in the back. I'm Thinking on how to make a molded tank that is safe at the same time for this location. Devils own Meth injection is the next thing I buy and a handful of injection nozzles and some solinoids to stage them.
Dash 5's are really the nicest I had so far for the street, you really don't see any difference in how long it takes to spool them but they have more GO !
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Old 21st June 2010, 08:54 AM   #150 (permalink)
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latest map on our 2.6 engine @ 1.6 bar

800cc injectors
HKS fuel reg
Twin Bosch pumps
GT2860-5's
standard cams
3" from turbo elbows back (standard elbows)

521AWHP
611BHP flywheel est
456lbft



nice flat torque from 4800-7000rpm
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