G35 NA stroker with ITBs
#1
09-30-2008, 11:18 PM
Join Date: Aug 2007
Location: Louisville, KY
Posts: 33
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G35 NA stroker with ITBs
We appreciate Paul (IvoryGT) bringing his car to us for a 4.15L NA stroker with one of the first ITB setups. As I write this we are delivering the car back to him, so please be patient with us for questions.
The build consisted of an Injected/BC 4.15L street-compression stroker with stock heads and BC 272 cams, valves and springs - all held together by L19 head studs and an IP billet main girdle. We did a quick Haltech Platinum tune in order to get the car back to the customer in time for body modifications before an event coming up. There is still more power to unlock especially in the heads, which we hope to do after the customer has enjoyed his car for a bit. The very limited time I drove the car, it was a blast!
We have built a number of these stroker VQs from 300-1300HP and this one went together flawless as usual. Of course working on NA cars is a breath of fresh air compared to the normal FI setup with pipes, lines, and turbos everywhere. The individual throttle bodies perform well and delivered worthwhile gains all the way through and make all the difference in high-end power. The peak hp increased 26whp, but at 7500rpm gains of 50+whp were unlocked over the stock plenum with spacer. Combined with a Haltech Platinum, the sysem idles well and throttle response is awesome. The core Jenvey ITB pieces are quality, but serious time needs to be spent finalizing it before they can ship it as a "kit". Many issues had to be overcome for installation such as fuel rails, throttle cable, valve cover swap and more.
The dynos below are pure DynoDynamics numbers, not Dynojet or fairy-tale numbers like we have seen in the past. The comparison dyno explains that well, look at the gains! 19% increase in displacement and 39% increase in power over stock!
5th gear dyno pull:
4th gear dyno comparison of:
Red = 4.15L stroker with ITBs
Blue = 4.15L stroker with plenum spacer
Green = Stock nonrevup 350Z with plenum spacer
The build consisted of an Injected/BC 4.15L street-compression stroker with stock heads and BC 272 cams, valves and springs - all held together by L19 head studs and an IP billet main girdle. We did a quick Haltech Platinum tune in order to get the car back to the customer in time for body modifications before an event coming up. There is still more power to unlock especially in the heads, which we hope to do after the customer has enjoyed his car for a bit. The very limited time I drove the car, it was a blast!
We have built a number of these stroker VQs from 300-1300HP and this one went together flawless as usual. Of course working on NA cars is a breath of fresh air compared to the normal FI setup with pipes, lines, and turbos everywhere. The individual throttle bodies perform well and delivered worthwhile gains all the way through and make all the difference in high-end power. The peak hp increased 26whp, but at 7500rpm gains of 50+whp were unlocked over the stock plenum with spacer. Combined with a Haltech Platinum, the sysem idles well and throttle response is awesome. The core Jenvey ITB pieces are quality, but serious time needs to be spent finalizing it before they can ship it as a "kit". Many issues had to be overcome for installation such as fuel rails, throttle cable, valve cover swap and more.
The dynos below are pure DynoDynamics numbers, not Dynojet or fairy-tale numbers like we have seen in the past. The comparison dyno explains that well, look at the gains! 19% increase in displacement and 39% increase in power over stock!
5th gear dyno pull:
4th gear dyno comparison of:
Red = 4.15L stroker with ITBs
Blue = 4.15L stroker with plenum spacer
Green = Stock nonrevup 350Z with plenum spacer
#4
09-30-2008, 11:39 PM
#7
10-01-2008, 12:23 AM
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#8
10-01-2008, 12:33 AM
Join Date: Aug 2007
Location: Louisville, KY
Posts: 33
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.. Sweet project 
