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Monooxide · 01-08-2009, 07:21 PM

I bet your plugs are white because of the stock fuel pump for sure. Stock KA pump or stock SR pump? That seems pretty dangerous on a Stock KA pump. They may be the same? Regardless still risky.

I run a 255 Walbro and ran 1 Bar which trickled to 12.7 PSI at redline. Measuring the AFR at the tailpipe on my car(S14 SR) it was 11.2 around 4000 RPM and leaned out to 12.2 at redline. Tail pipe reading should be a little leaner than downpipe/elbow readings so maybe 11.7 or less at redline? I would say its safe. BTW I was on Stock ECU, Injectors and MAFS. I made 273 WHP, have fun!

How did your compression turn out?

01-08-2009, 07:21 PM	#3
Monooxide Zilvia Addict Join Date: Mar 2005 Location: Farmington/Flint, MI Age: 37 Posts: 675 Trader Rating: (8)	I bet your plugs are white because of the stock fuel pump for sure. Stock KA pump or stock SR pump? That seems pretty dangerous on a Stock KA pump. They may be the same? Regardless still risky. I run a 255 Walbro and ran 1 Bar which trickled to 12.7 PSI at redline. Measuring the AFR at the tailpipe on my car(S14 SR) it was 11.2 around 4000 RPM and leaned out to 12.2 at redline. Tail pipe reading should be a little leaner than downpipe/elbow readings so maybe 11.7 or less at redline? I would say its safe. BTW I was on Stock ECU, Injectors and MAFS. I made 273 WHP, have fun! How did your compression turn out?