Timing and fuel question - ZR-1 Net Registry Forums

Lucky90 · 08-20-2013

How does the combination of advancing the timing and making the zr1 less rich ,add performance. Im asking because when buying a computer chip these perameters are changed. Thanks guys.

Kevin · 08-20-2013

are you buying a chip from Marc Haibeck? He's one of the best and if you're not buying from him you should consider it. The car runs very rich from the factory so pulling fuel will give you a more complete burn and produce more power....I think that's what marc said years ago...

tomtom72 · 08-22-2013

This is just from memory so go over and read Mr. Haibeck's write up on our engine management programing. The one thing I remember was a mention of "false knock" events written into the OEM programing. Yes, Marc does alter the fueling. I think he said it was a bit too rich. Better to check me on the last bit though.

Oh and this bit is from my own experience for not paying attention to details. I have leaned that when an LT5's spark plugs are not T/Q'ed correctly and they work loose you get tons of knock.

man was I taken to school on that one. I proly should have my power key revoked for that bone headed move! My bad!

Tom

08-20-2013	#1
Lucky90 Join Date: Aug 2013 Location: vermont Posts: 49	Timing and fuel question How does the combination of advancing the timing and making the zr1 less rich ,add performance. Im asking because when buying a computer chip these perameters are changed. Thanks guys.

08-20-2013	#2
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,632	Re: Timing and fuel question are you buying a chip from Marc Haibeck? He's one of the best and if you're not buying from him you should consider it. The car runs very rich from the factory so pulling fuel will give you a more complete burn and produce more power....I think that's what marc said years ago... __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

08-22-2013	#3
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Timing and fuel question This is just from memory so go over and read Mr. Haibeck's write up on our engine management programing. The one thing I remember was a mention of "false knock" events written into the OEM programing. Yes, Marc does alter the fueling. I think he said it was a bit too rich. Better to check me on the last bit though. Oh and this bit is from my own experience for not paying attention to details. I have leaned that when an LT5's spark plugs are not T/Q'ed correctly and they work loose you get tons of knock. man was I taken to school on that one. I proly should have my power key revoked for that bone headed move! My bad! Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member