Quote:
Originally Posted by rchalmers3
Dougal your Isuzu 3.9L sounds very similar to the 2H. It turns slow and has a similar displacement. Hey, I have an idea and request: Do you have enough info on the 2H to map the T25 .49 A/R and T25 .64 A/R for us?? If you don't, maybe you could map them using your motor.
It would be interesting to see exactly what the margin of saftey is you are refering to.... in a graphical format!
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The capacity of the two engines is similar enough, that the main difference comes down to the revs.
The 2H revs about 10% more which gives you another 10% possible air consumption. I'll post up a map later on but it may take a while as I'm currently investing my spare time in some turbo adapters.
The compressor maps of the T25 with the 0.64 A/R exhaust housing aren't any different, but it'll give a little less exhaust restriction so it won't be as likely to blow the exhaust valves open. My Isuzu was a factory turbo and fitted to trucks with exhaust brakes, so it has no problem running up to 40psi exhaust backpressure.
The 2H I wouldn't like to put through the same test.