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Old 11-12-2008, 06:51 PM   #1 (permalink)
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Default Do I need to lower compression?

I have a 98 Si, d16y8, bone stock for the time being. If I got a T25 or T3, running at 10psi or less, would I need to do something to lower my compression?
I ask because I know the y8 is a relatively high-compression engine, but I'm reading alot of people turboing d16's on stock internals, and as far as I can tell, without changing the pistons or anything. Are these people installing thicker head gaskets to lower the compression? If so, what's a good target compression for a y8 running a T25 or T3 at about 10psi?
This is kind of the basics of what I'm planning:
-- either an hf manifold or a log-style; I want to retain AC + PS.
-- T25 or T3, preferably a used (in good condition, or rebuilt) Garrett. Internal WG.
-- a long, slim FMIC (I've seen some that are as slim as 5.5")
-- OBD1, chipped, don't know what tuning... perhaps Uberdata?
-- upgraded fuel pump and injectors. Will have to look into these a little more...

Looking forward to constructive replies!

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Old 11-12-2008, 07:13 PM   #2 (permalink)
 
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most boost like 7psi on stock internals just under 200whp
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Old 11-12-2008, 08:22 PM   #3 (permalink)
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you will be fine just make sure the tune is good and 250 is safe do more research
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Old 11-12-2008, 08:37 PM   #4 (permalink)
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stock comp is very low to begin with.. thicker head gaskets were band aids back in the day to lower comp when tuning was not there AKA FMU
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Old 11-12-2008, 08:38 PM   #5 (permalink)
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btw d16y8 is 9.6:1 not high at all
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Old 11-13-2008, 05:21 PM   #6 (permalink)
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Thanks for the input guys! It's much appreciated!
I had posted the same question in another forum, and got much less useful replies than in here.
Now I know where to ask my questions...

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Old 11-14-2008, 08:31 AM   #7 (permalink)
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11.5:1 and 10psi, still running just fine. Great motor on Pump gas. Made 240 at the wheels.
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