I've always been told you cant change he timing on a cpu controlled car because the cpu will step in and correct it. I was just wondering if this is true and if not, if there is anyway to tweak the timing a little and get a worthwhile performance increase without sacrificing the life of the engine.

 

There is a wire you have to disconnect. Then you can bump up the timing just like normal. Then hook the wire back up when your done.

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http://bitchincamaro.no-ip.com 91 RS Camaro 5-speed black w/t-tops 305 TPI
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which wire is this ? im also interested in boosting up my timing.

 

Its a brown wire with a white stripe. Theres a bullet style connector on the firewall were the heater blower is. Just unplug that and play with your timing.

I beleive your engine service light should come one when its disconnected.

 

Anyone have any recommendations as to what settings would provide a boost in performance w\o doing damage to the engine?

 

10 advanced should be fine thats what ive been running.

 

Just about everyone here will either say,

"start at 8 and work your way up until you feel the most performance gain with out detinating"

OR

"Mine is set at 10"

 

The ECM works off what you tell it base timing is. IWO, the chip thinks that 6 deg is base and it adds timing on and keeps in mind that whatever it is told to add on, the acutal is the add on + 6 deg. In effect, you are fooling the ECM into thinking that it has 6 deg when it has 10 or whatever you set it to. Problem is that the ECM still thinks it has 6 deg so when you add say 4 deg to make 10 deg, it thinks it's base is 6 deg. This means that everywhere throughout the curve, it gets how ever many more degrees you set it at. If certain areas should not get more than a certain number, it will not know that until it pings. I prefer to do it thru the chip so it is more selective where and when you want the timing increase instead of going throughtout the board.

 

How much does the ECM add on top of the base timing of 6? Does having an aftermarket chip affect this and do you think it would only cause probs if someone were to advance timing a few degrees on top of running a chip? Also, how does modifying timing affect gas mileage? I know the usual answer to that is "depends how you drive it", but I'm sure it still has some impact on mileage. I've noticed that since I've had my chip (about a month or so) my car gets the same mileage if I drive it like a sane person (18-19mpg), but I actually have to drive it with a slight bit more ease to attain that same mileage. For example: I'll get about the same mileage as the stock chip if I shift close to when the shift light comes on, which has dropped about 500rpms from stock. With the stock chip, the car 'wanted' me to shift at about 2500rpm....now, it 'wants' me to shift at about 2000rpm. And when I get on it, it runs like a raped ape but forget about gas mileage!