Spoolio
15+ Year Contributor
- 730
- 10
- Sep 3, 2003
-
Port Charlotte,
Florida
whats actually involved in putting like 95 pistons in my 91 6bolt?
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Would love to know whom told you this. Remember we are forced induction engines. The lower the compression the more boost can typically be run before onset of knock (pump gas) which can offset any gains thru compression.nightspeed87 said:( Learned today that you approx gain 4% increase with these pistons and are better choice over 1g pistons... )
DSM90AWD said:Would love to know whom told you this. Remember we are forced induction engines. The lower the compression the more boost can typically be run before onset of knock (pump gas) which can offset any gains thru compression.
A few years back I'd met up with a guy in NJ that was a pretty serious racer and told me that without a doubt, the 2G piston in a 1G was a huge waste of his money w.r.t. performance as he saw zero gains
andytalon said:Not bad mouthing you, but for a turbocharged car the best comp. is 8.5:1 it is a proven fact. Not asking for any comments, just stating my fact.
DSM90AWD said:I invite differing viewpoints, but fact denotes dyno numbers / 1/4 mile times..etc to substantiate a point. I'd love to see a before/after compare with all other things being equal if you have it.
In the conversation I noted above, the gentleman said the following about his buildup (VPC, 18G, FMIC, 660s)... he said his Extrude Honed intake gave him 35HP on TurboTrix Dyno, his 272 cams gave him 25HP on TurboTrix dyno, the 2G pistons gave him zero HP on TurboTrix Dyno but cost about as much as the other mods. He also started going thru headgaskets pretty regularly (higher compression = more succeptable to knock). Granted he did not have a means to control timing, which with the 1Gs can be pretty radical after 5.5K RPMs (big spike at 6K).
I don't dispute that higher compression pistons will help power production if have control over timing/fuel and properly tuned for it. But for the person whom looks to do this swap as a mod to perfectly fine 1G engine, I still say money is best spent elsewhere.
Also spending the money for parts (rings, HG) / machine work (machining rods, honing of bore..bla..bla..bla) to stick in used cast pistons is a bad idea all around. Forged pistons that fit the 1G rods can be had for ~$400 (I'm sure even cheeper) and will stand up to misjudgements in tuning much better-er