Engine build questions

[AnLe]

for the map sensor matter, I had some mechanical problems and for lack of ideas I played around 3bmap sensor and stock boost program, it gave smooth 1.5bar (I had of course fuel maps for the current setup)

[4WheelDrifter]

There are some scary chip around that shouldn't be. I'm just glad my old chips gave Mihnea a laugh, not a fright! I just looking forward to driving my S2 again. I've got an A3 to show who's boss.
I had to get my ECU out of the bin again. Bitch!

[ThatGUY]

Not to be rude...

but back to my question. The stock compression on the 93 AAN is 9.3:1 if I use the metal head gasket it should be 9.1:1--Right?

@Mihnea would 9.1:1 be ok.

If I wanted to lower the compression by .1 or .3 how much lower does the top of the piston need to be (from the pin to the piston top)?

Thanx
Andrew

[sla_s2]

yes, peak is 1.4 and then it drops to 1 bar. car has free flow exhaust and cone filter, runs on 98 octane fuel. acoording wide band measurements the mixture is not lean at all.

sla s2

p.s. as i said this was made for experiment only and i showed this curve for everyone to see it, there is no need to laugh mihnea

So you got 479Nm at 1.4 bar peak manifold pressure on a stock 3B K24 with stock everything else, and not on very high octane fuel? I have to admit if that is true it sounds very strange. It is also the strangest power profile I have seen on any S2 engine, stock or tuned.

[Uukrul]

p.s. as i said this was made for experiment only and i showed this curve for everyone to see it, there is no need to laugh mihnea

well, that "experiment" is still killing my 3B without success. And I can forgive that chip if there will be "big bang" - the power is impressive

p.s. I am going to rebuild engine anyway

[Jamo]

Interesting that the code was "borrowed" for the Digitec chips never knew that.

[kwlw]

Interesting that the code was "borrowed" for the Digitec chips never knew that.

He is still running digitec. For a few years now. No problems after rebuild. Note, that Uu is running bigger IC than stock (maybe it's the key).

When rebuilding engine, some detonation signs were seen on pistons, but only minor ones.

Sau