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Re: New Engine Update (archive)
[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]
Posted by Tim Panczak on April 23, 2001 at 16:11:29:

In Reply to: New Engine Update posted by Justin - RedFive on April 22, 2001 at 23:18:35:

Justin,

Been following your posts with interest, I plan on doing the same mods to my motor, including the supercharger (I would like to collaborate on this). I don't think it's the air flow sensor though. If your engine is breathing better, the meter should still register the increased air flow and adjust the injection duration accordingly. If at WOT you are exceeding the air flow range of the meter, and have pegged the vane wide open, you would run lean because the engine thinks it is getting less air than it really is.

It seems you are way out of spec (farther than could be attributed to a custom chip) to temper your exhaust tips. Assuming you are using the stock injectors, I would look at your O2 sensor and for too high fuel pressure in the injector rail.

Good luck,

Tim

red 90 535iM (racing dynamics headers, stroker crank and rods, wiseco 95 mm forged pistons on deck pending further research)


For those who follow my sporadic postings, know that I have been installing a highly modified 3.5l into my 535 for the One Lap of America race. Well the race starts in less than two weeks and I have a couple things to figure out.

The installation went well. It took 3 days to remove the old engine and install the new engine. I will detail the entire process on my website in a couple weeks.
The engine started fine. She runs and definitely has more power. The big problem is the fuel mixture.
Baer and I have been trying to get a Split Second Mass Airflow Sensor from BMP, HMS, and Split Second for 5 weeks without any luck. This is a must for modified engines because the vane airflow meter cannot compensate for the extra air. Anyhow, the engine is running at full rich. I have been getting 11 to 12 mpg(easy driving). I removed the performance chip and reinstalled the factory chip to attempt to lean out the mixture.
So the engine now has 1000 miles and 1 driving school. The engine was running so rich at the driving school my tail-pipes are gold and blue! The engine pulls very strong, but without a performance chip lacks a good deal of horsepower.
On Thursday the car will be put on Autothority's dyno and have the chip configured custom for the car.
I am hoping for at least 300hp.

I will try to keep you guys informed on the results.
--Justin




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