[Mk2] [Turbo] Rev2 pistons

[chrishewett]

Will rev 2 (us l4 turbocharged ) pistons fit ok in a rev3 torbo?

[bobhatton]

Will rev 2 (us l4 turbocharged ) pistons fit ok in a rev3 torbo?

They will fit if the bore is the correct size but will raise the compression ratio.

[chrishewett]

Thanks for the reply. I figured that would be the case. Can you guess at the possible compression ratio given std other components? We will measure accurately later this week.

[mr2magic]

Cr would be 8.8:1

[bobhatton]

Cr would be 8.8:1

Yes, up from 8.5:1

[chrishewett]

Assuming 8.8 what would be maximum safe boost?

[bobhatton]

Assuming 8.8 what would be maximum safe boost?

Safe is no more than stock for Rev 2

[MR2 Rich]

Assuming 8.8 what would be maximum safe boost?

Safe is no more than stock for Rev 2

Wouldn't it depend on what turbo he is using and fuel used?

[mr2magic]

Isn't this one of those......don't go there!!.....topics?

[bobhatton]

Assuming 8.8 what would be maximum safe boost?

Safe is no more than stock for Rev 2

Wouldn't it depend on what turbo he is using and fuel used?

Yes.
Run race fuel and 1.5 bar boost would be ok, being on the right part of a compressor map would let more boost be run as well as water injection.

[MR2 Rich]

You say 1.5bar but wouldn't that vary with different turbos? Say a Ct26 vs a GT30 at 1.5bar would be the same pressure but different flow rate? Wouldn't they?

[bobhatton]

You say 1.5bar but wouldn't that vary with different turbos? Say a Ct26 vs a GT30 at 1.5bar would be the same pressure but different flow rate? Wouldn't they?

Yes they would, but with high octane fuel you can run much higher boost on any turbo

[mr2magic]

Yep, the more efficient the turbo, the lower the intake charge temp. and the lower the chance of temp. related detonation/pre ignition. The same goes for the higher octane rating of the fuel - the higher the rating the less chance of temp./pressure related detonation/pre ignition.