Originally posted by SilverSVT98:
Id personally ditch the chip UNLESS its tuned ON a dyno WITH a wideband. Dont let anyone tune your car over the phone. If it was tuned on the dyno..and the tuner let you leave with a 18:1..smack him. Then once more for me.

If you want to keep the 30s, and they were calibrated in with the chip, id ditch the chip and buy a Pro-M meter with a SC calibration for 30s(the SC calibration will make you run rich), The factory computer aims for a 14.7/1 A/F.
With the rich calibration you should be good to go. Not to mention youd pick up more HP with the Pro-M.

Lastly, if you still wanted to be even safer, you could also run an FMU(once agian im assuming the 98s have return fuel systems, ill look at my wife's 98 tomarrow to be sure). Dont let people tell you FMUs are bandaids or hack jobs. They are safe, and they are tunable...though not always ideal.


Well I agreed with you up to then.

After that point you are talking out your bottom side.

Aftermarket MAF's trying to fool the PCM are bandaid fixes. Especially when configured for injectors more then one size larger then the PCM is programmed for.
They end up leaving no tunability for idle, off idle, or cruising.
On top of that you are stuck with "whatever" calibration the MAF was programmed for (we've all seen that hit or miss!) and how it will work with the transfer function programmed into the PCM. Thus again making it much harder to tune.
You could always program the MAF's transfer function into the PCM but then why would you need a MAF that changed injector size in the first place. That would be double redundant since the PCM controls injector slope (high & low).

FMU's with stupidly high fuel rail pressure are also most definitely bandaid fixes.
Over tasking the injectors to forcibly run well past 100% duty cycle will garner erratic fuel flow and poor consistency. The fuel injectors spray pattern is also severely degraded causing poor fuel atomization and more erratic A/F ratios. Not to mention it's just plain harder on the injectors!
Seriously over pressurizing the fuel system and fuel rail is also just asking for early failure and surprise leaks.


Throwing in your "big numbers" does nothing for your credibility when you can't back up why you are stating these things as good ways to "not fix the problem" but just "patch" it.

I've stated some very good information as to why those are considered "bandaid" fixes and why you should definitely not go that route.


What information do you have to say they are not and should be used?



BTW - the PCM doesn't care what the A/F ratio is at WOT. Only under light load situations does the PCM try to keep the A/F ratio at Stoich (~14.7)

At WOT the PCM just goes off the tables in the PCM and data from a few sensors. Yet another reason to tune the PCM and not use bandaid fixes instead!

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.