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> Raising boost and compression ratio
post Mar 30, 2017 - 3:12 PM
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rhodesyboy

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Hi I'm probably going to do a forged rebuild this summer and I'm just wondering on peoples experience with boost and compression ratios.

It's a 3sgte rev3 and I am tempted to run about 15-16 psi with a 9:1 compression ratio, i know its only .5 up from stock but there is a fair bit more boost to go with it.
I should also be able to get front mounted intercooler by then and will of fitted decat downpipe, 3 inch front pipe and possibly a hybrid turbo from gt4 play.
I always fill up with tesco momentum which is 99RON and can always fit a water/methonal injection system if needs be for running the boost and compression ratio i want.

So yeah if anyone has done something similar to what i want or thinks it's a good/bad idea input is always welcomed, cheers.
post Mar 30, 2017 - 10:16 PM
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HardHead93

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The 4th gen 3sgte has 9:1 compression pistons and can run up to 17 psi of boost on 93 octane fuel. I would think you could run that on your 3rd gen as as long as you get a standalone ECU tuned to handle those changes. When you change the compression of an engine you need to adjust the fuel and ignition timing appropriately.
post Mar 31, 2017 - 6:04 AM
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rhodesyboy

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Ahh yeah forgot about having to change the ignition timing, I'd have the same problem with lowering the compression too i would imagine?

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