Noz Posted November 6, 2012 Share Posted November 6, 2012 Anyone run higher compression? Seen some 11:1 pistons for the NA, just wondered the limitations of higher GTE compressions and how you would know when you lower it or be able to raise it. Just researching my limitations for stock 10.1 Quote Link to comment Share on other sites More sharing options...
johnny g Posted November 6, 2012 Share Posted November 6, 2012 11:1 is too high for any real boost to be honest. I'd stick with 9.5:1 as a maximum for any boost. Stock TT is 8.5:1 IIRC. Quote Link to comment Share on other sites More sharing options...
Lee P Posted November 6, 2012 Share Posted November 6, 2012 Depends how much power you want to run and the fuel you use really. High compression is great I ran 9.5:1 and loved it. With a good ecu 9.5:1 is fine to a point and then you would have to run an additive of some sort to help against det. I wanted to push it a bit more really with mine to see how much further you could go on pump fuel. I think for 600hp you could get away with between 9.5:1 - 10:1 on 99 but you would need a syvecs, good injectors and racing plugs Quote Link to comment Share on other sites More sharing options...
Noz Posted November 6, 2012 Author Share Posted November 6, 2012 I was aiming for 9.5:1. I only mentioned the 11:1 as it had me thinking. So, how can a better ECU run higher power with the same compression, my thinking of det is caused by the heat generated, how can a better ECU control the volume being sent into the chamber and reduce chances of det? Quote Link to comment Share on other sites More sharing options...
johnny g Posted November 6, 2012 Share Posted November 6, 2012 I was aiming for 9.5:1. I only mentioned the 11:1 as it had me thinking. So, how can a better ECU run higher power with the same compression, my thinking of det is caused by the heat generated, how can a better ECU control the volume being sent into the chamber and reduce chances of det? The ECU has a finer control on the fuelling and timing, but also the closed-loop knock can listen for knock and retard very quickly to prevent any damage. Quote Link to comment Share on other sites More sharing options...
Lee P Posted November 6, 2012 Share Posted November 6, 2012 **Edit-- beat me to it lol...** The 11:1 pistons for the NA would be used if you were keeping it an NA and you were trying to get more power. You will want a good ecu if you want to keep your engine in one piece and get the most out of high compression. The ECU needs to react quick, have very good knock control, engine trips and fine fuel trimming. Quote Link to comment Share on other sites More sharing options...
Noz Posted November 6, 2012 Author Share Posted November 6, 2012 Im most likely going to go with AEM, i spose im limiting myself on power with a higher compression at that point. Quote Link to comment Share on other sites More sharing options...
Lee P Posted November 6, 2012 Share Posted November 6, 2012 Im most likely going to go with AEM, i spose im limiting myself on power with a higher compression at that point. Mine was on a standalone AEM but it would have been better on the Syvecs. AEM FIC would be no good Quote Link to comment Share on other sites More sharing options...
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