zerosports or garret
06 January 2006, 07:11 PM
#31
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Join Date: Nov 2001
Location: Leeds - It was 562.4bhp@28psi on Optimax, How much closer to 600 with race fuel and a bigger turbo?
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no, just recommending a supplier 
I believe you've first hand experience of his turbo's too?
David
I believe you've first hand experience of his turbo's too?
David
07 January 2006, 10:39 PM
#34
If I can take this back to #25 by JB:
The 20g on a 2.5 is a huge improvement on bhp at early rev points.
Between the 20g/2L and the 20g/2.5 what other mods were introduced please; are the fuels the same etc or are the curves real 'apple for apple' comparisons where the only difference is the capacity?
Can you plot the same John for torque?
Finally what was boost at , say, 3K 4K 5K etc rpm.
Graham.
The 20g on a 2.5 is a huge improvement on bhp at early rev points.
Between the 20g/2L and the 20g/2.5 what other mods were introduced please; are the fuels the same etc or are the curves real 'apple for apple' comparisons where the only difference is the capacity?
Can you plot the same John for torque?
Finally what was boost at , say, 3K 4K 5K etc rpm.
Graham.
07 January 2006, 11:13 PM
#35
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Join Date: Nov 2000
Location: 32 cylinders and many cats
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I changed from ported OEM headers with aftermarket uppipe to Gruppe-S headers/uppipe, otherwise both apples
Boost on the 2.5 was 1 bar at about 2400 RPM, 1.4 bar soon after, rolling gently to 1.27 bar at the top.
Boost on the 2.0 was 1 bar at about 3000 RPM, then I can't remember in detail, but I think it was about 1.7 bar dropping to about 1.5 bar at the top.
More capacity (if you have the strength and breathing and ability to rev) with the same turbo is a double gain in some ways - you have more naturally aspirated torque to spool up your turbo, think of it as earlier as well as higher. I didn't find it had the strength in terms of holding the gaskets to support a higher output though than a boggo 2.0, but I could have been unlucky. I won't start going on about how I want to fiddle with an iron block on a turbo motor otherwise I will go all dewy eyed and keep going on about 4G63s...
Torque plots (at the wheels):
Boost on the 2.5 was 1 bar at about 2400 RPM, 1.4 bar soon after, rolling gently to 1.27 bar at the top.
Boost on the 2.0 was 1 bar at about 3000 RPM, then I can't remember in detail, but I think it was about 1.7 bar dropping to about 1.5 bar at the top.
More capacity (if you have the strength and breathing and ability to rev) with the same turbo is a double gain in some ways - you have more naturally aspirated torque to spool up your turbo, think of it as earlier as well as higher. I didn't find it had the strength in terms of holding the gaskets to support a higher output though than a boggo 2.0, but I could have been unlucky. I won't start going on about how I want to fiddle with an iron block on a turbo motor otherwise I will go all dewy eyed and keep going on about 4G63s...
Torque plots (at the wheels):
Last edited by john banks; 07 January 2006 at 11:19 PM.
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