.49 a/r vs. .89 a/r ~ What differences would I see?

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09-01-2003, 06:28 PM

blades

0.0 BAR

Thread Starter

Join Date: Jun 2003

Posts: 12

.49 a/r vs. .89 a/r ~ What differences would I see?

I've currently got a Sunbird turbocharger on my 2.2 S-10 pickup. It has a compressor a/r of .48 and an exhaust a/r of .49

I'm looking at a replacement turbo that has the same compressor a/r, but has an exhaust a/r of .89

What sort of differences could I expect to see if I used this turbo with that much difference in the exhaust a/r?

The S-10 2.2 is not a high-revving engine, and if it came down to a choice, I would prefer to have the boost available at a lower rpm. My current turbo has what I would consider substantial heat damage, chips, and frayed edges on the turbine impeller, but in spite of this it still boosts pretty well. I'm only running 9 psi, and don't plan on going over that until I rebuild my engine to withstand higher boost.

09-01-2003, 07:02 PM

cd1fidy

0.5 BAR

Join Date: Apr 2003

Posts: 80

Re:.49 a/r vs. .89 a/r ~ What differences would I see?

then keep the one you have a .89 ar would have some extreme lag

09-01-2003, 07:19 PM

shortyz

3.0 BAR

Join Date: Dec 2002

Posts: 3,396

Re:.49 a/r vs. .89 a/r ~ What differences would I see?

fidy is right.

gj fidy

09-02-2003, 08:56 AM

customcoach

1.5 BAR

Join Date: Feb 2003

Posts: 828

Re:.49 a/r vs. .89 a/r ~ What differences would I see?

What turbos are these? If they are Garretts you can swap the exhaust housings around, put your .48 AR on the new turbo if its in better shape than your old one. It should only be six bolts holding it on there. The .89 AR will never spoool up on that low reving engine in my opinion.