Making a G35 run like a G37?
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#25
Originally Posted by Stefnopolis
So far... (1) Intake, headers, and exhaust (2) G37 pistons in the G35 VQ
(3) Bore it to 3.7 (never heard of that being done) ... What about boring it out to a 3.8 ... Then TT .. would be like the new GTR
(3) Bore it to 3.7 (never heard of that being done) ... What about boring it out to a 3.8 ... Then TT .. would be like the new GTR
Stock parts are almost never superior to a quality aftermarket one in terms of performance and ability to withstand the stresses of racing.
#26
Originally Posted by partyman66
Why would you use G37 pistons in a modified G35? If you go to all the trouble of boring out the motor and upgrading the pistons, go with some serious aftermarket ones that can withstand unbelievable abuse.
Stock parts are almost never superior to a quality aftermarket one in terms of performance and ability to withstand the stresses of racing.
Stock parts are almost never superior to a quality aftermarket one in terms of performance and ability to withstand the stresses of racing.
#27
Well its possible to do what you said. From what i have heard wouldnt make a significant change...
According to what i read from cosworth..
A simple approach to increasing displacement is to punch out a motor as far as its bore spacing will allow and add as much stroke as possible. This works for old rev-limited V8s with cast iron blocks (where piston speeds aren't such a concern, since reciprocation mass ultimately limits revs). But in a VQ with the potential to spin up to 9000rpm, that's not the case. From a basic displacement perspective, the available room allows Cosworth to increase stock stroke by 6mm from 81.4 to 87.4mm and bore (limited by the factory bore spacing) from 95.5 to 96.0mm, increasing total displacement from 3498cc to 3796cc, or (((((((((3.8 liters.))))))))))
Increasing the stroke by 6mm has a noticeable effect on piston speeds-a significant concern for an NA engine designed for high-rev power. The original dimensions are over-square (larger bore than stroke) with a bore/stroke ratio of 1.17, while the 3.8-liter dimensions would bring the engine closer to square (equal bore and stroke) with a ratio of 1.10. Although the engine is still over-square, which is typically good for higher revs, the mean piston speed at 8500rpm has increased from 23.1m/s to 24.8m/s; 25 m/s is roughly F1 engine territory.
According to what i read from cosworth..
A simple approach to increasing displacement is to punch out a motor as far as its bore spacing will allow and add as much stroke as possible. This works for old rev-limited V8s with cast iron blocks (where piston speeds aren't such a concern, since reciprocation mass ultimately limits revs). But in a VQ with the potential to spin up to 9000rpm, that's not the case. From a basic displacement perspective, the available room allows Cosworth to increase stock stroke by 6mm from 81.4 to 87.4mm and bore (limited by the factory bore spacing) from 95.5 to 96.0mm, increasing total displacement from 3498cc to 3796cc, or (((((((((3.8 liters.))))))))))
Increasing the stroke by 6mm has a noticeable effect on piston speeds-a significant concern for an NA engine designed for high-rev power. The original dimensions are over-square (larger bore than stroke) with a bore/stroke ratio of 1.17, while the 3.8-liter dimensions would bring the engine closer to square (equal bore and stroke) with a ratio of 1.10. Although the engine is still over-square, which is typically good for higher revs, the mean piston speed at 8500rpm has increased from 23.1m/s to 24.8m/s; 25 m/s is roughly F1 engine territory.
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#29
Originally Posted by biggz786786
get all the bolt on's and get a new FD! then get a really good custom tune! that will for sure keep up with a g37
BUT...with all the bolt on's and labour you might aswell pay an extra grand to go FI
BUT...with all the bolt on's and labour you might aswell pay an extra grand to go FI