zdkdeeier493

Please bare with me here. Im desperate and my baby is hurtin':

1. Bought an ASP 177.6mm (178mm) pulley about 3 years ago and had been running it WITHOUT any sort of ECU tune until a month ago. It was running like a complete monster and never once did I have any problems.

2. About a month ago, a friend with factory MB software (ex tech) told me he would adjust my A/F ratio and minimum octane rating (to 87) to get more power out of the car. Said it looked like my engine temps were a little high b/c of the pulley's extra air

3. He set the A/F to a 20% increase in fuel, and I did a road rally that weekend. The car guzzled a tank seeing as it was running PIG RICH and I only got power between 3-5k RPM. It was also slower than an E500

4. After the rally I realize that the car reeks of fuel and I end up having to replace the fuel lines and a leaking fuel level sensor and gasket (b/c of the increase in fuel? )

5. We go back and reset the A/F to 0%, then make it a 10% increase (have to first reset to 0% to reset any auto-adaptations the ECU might have made). CEL had been on earlier (b/c of the constantly changing 02 values) and then I get a code saying one of my 02 sensors had shorted out. I drive to Vegas, and again the car reeeeks of fuel (smell coming from the exhaust, not the engine bay where the fuel lines were replaced).

6. Drove back from Vegas and everything was fine except power is still way down (esp. in the mid-RPM range). Now, somehow the CEL is gone (the one that was for the shorted 02 sensor) and there is no smell of gas.


Still though, the car is slower than it was before this whole mess. I am very fearful of running a car that is too lean, but I had been driving it like I stole it for 3 years with this ASP pulley and there has NEVER been a problem! Should I just reset all of my values to stock and pretend this never happened? Should I pony up and get a Renntech or LET, etc. tune? I just want my old power back...

Any tips/hints/thoughts/suggestions?

chiromikey

iirc, setting octane to 87 tells your car that's what you're running and it will retard timing to allow you to run 87 without detonation. set it back to the factory setting so your ecu will give your timing back.

LB63

I agree, put it back to the way it was before. If you want the most out of your pulley I would suggest you get a tune from a reputable shop that has a dyno so you can verify the changes help, not hinder, your car.

Vadim @ FD

Does not make any sense.

Unless he has a DEVELOPER version of STAR , he has no ability to affect A/F ratio this dramatically.

Have him go back to where you were and start from there.

If he can not do it, have dealer flash it back to the latest stock setting.

Good Luck!

zdkdeeier493

Thanks everybody. I appreciate it. Going back to 100% stock tomorrow. I'll let you all know how it goes.

TopEndS62

MAybe i'm slow or someone can explain,

why would he think that setting the minimum octane rating (to 87) would get you more power out of the car??

thanks

JonMBZ

Sounds weird.. most mb techs do not do performance tuning I would stick to the professionals in this area before he does major damage to your car.

Fast55

I would not run the car 1 minute longer in its present state of tune. More than one 55K motor has been lost to over rich conditions! What you're describing would have to be so rich, I would not be at all surprised if it has already suffered cylinder wall/piston damage. Keep that idiot away from your car and do a leak down test on every cylinder ASAP.

JustPete

Sounds like you loaded your cats which could also explain the CEL on the O2 sensors.

Timeless

Exactly what I was thinking. Powerchips set mine to 93 octane since that is what I use here....supposedly to increase timing and horsepower.

zdkdeeier493

Yes, it changes the timing to run higher octane fuel more efficiently.

He does have the developer version. That thing is so crazy, you can literally change every single thing about the car. There are also part numbers for things that we didnt even know existed (think bulletproofing).


We changed everything back to stock values today. Probably going to replace the faulty O2 tomorrow and then do the reset one more time to make sure everything is all good. Haven't punched it yet to see how it drives, but from what I can feel, the jumpiness is back

Vadim @ FD

Good Luck, my friend!

Ali_E55

mine is set to slightly Rich

will it damage my engine !!

my tech did it before because the fuel pressure was low.

but then i changed my Fuel pupmsand assembly but didn't reset it back to normal


is it ok ?

stevebez

Need to check your a/f ratios... anything lower than 10 and I would have it remedied... Who did your tune?

Running rich is a way to overcome detonation as the extra fuel cools things down.... so a little rich is probably required if you have a bigger pulley / mods and much better than a little lean, well safer at least.

btw, and apologies to the OP ... Is there anyway to get a/f from autoengenuity / datalogger without a sniffer?