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MD321T 2.0lt on my 05 STI Blob - Very Happy

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Old 01 February 2011, 01:28 PM
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STiFreak
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Originally Posted by aXeL
Cheers Gents,

Car is still running the standard exhaust with the PPP down-pipe cat and minus the center cat.

Boost is at 1.5 then tailing down to 1.4 as the car started to det for no obvious reason, unless the AFRs were too high but Duncan would pick up on that. Anyway, he therefore had to pull a tonne of timing (~5 deg) which would cause a massive hit on the power. If I'd forked out the £1500 for a Syvecs we might've isolated the issue there and then...





Based on what other people have posted for 321Ts on 2.0lt with TMICs I expected this to be around 410/360 ish but c'est la vie. At what I've got with the driving experience I'm very happy!
The PPP exhaust is probably your main restriction when trying to flow enough for 450bhp ... guessing it is creating significant back pressure, killing power and making the engine more prone to det. Yet your power still seems on the low side taking that into account and I would suggest before spending any more money on mods or mapping, do a compression and leak down test to confirm there is nothing wrong with the engine internally (e.g. oil getting passed a damaged piston ring, lowering the fuel octane and making it more det prone). It is also a good oppotunity to check the condition of your plugs. Are you still on PRF6B's?
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