Hey guys..

I think I'm running very rich following install of the mods in my sig.. I'm getting a lot of carbon at the muffler tips. Does this make sense? What are my options for clearing this up?

Thanks as always..


[Modified by dcronkhite, 12:17 PM 11/11/2001]

 

On what I see in your sig (mods for increased airflow) I would say you are o the lean side.

Michael

 

I would have thought the same thing were it not for the carbon buildup in the exhaust..

 

By a Maf Translator from exit 28 motorsports for $175.00 and go to a chasis dyno with wide band O2 and get that baby dialed in to the tee. Last month on dyno with maf t I picked up 45rwtq and 25rwhp by just going 4% leaner. I already pulled high 11s running rich on motor only, and after new power, could'nt hook up at all at the track :D Look out next spring with e/t streets getting ordered soon :smash:

Nitrovette

 

I don't know if you're running rich or lean, but if you had a MAF Translator and an Ease Scan, you would know after 1 run. Talk with JR from Team ZR-1. From what I understand, he can get the best prices on the MAF Translator. Also, he has the knowledge on how to use it with the Ease Scan program.
The MAF Translator allows you to adjust (dial in) richness or leanness by sending an adjusted signal to the PCM. The Ease program allows you to monitor and record changes.

 

Without knowing your a/f ratio its hard to say. You need to monitor your fuel trims, and more specifically your O2 sensors at WOT. Like was allready mentioned. Its best to baseline your O2 sensors first with a Wide Band O2 sensor at a dyno shop before you begin your tuning quest. Although not absoutly necessary. Your first step is to aquire an OBD-II scanner like Autotap or EASE.

 

It's Autotap/MAF translator time. When I put the cam in my '99 Camaro SS I had to "tune" my A/F mixture as I was initially running very rich at idle and way lean on the top end. I corrected the problem with the aforementioned combo.

Good luck!

 

I say you are running lean. Get a MAF Translater, its on special on the forum for $165 a great price. Start out 2% rich and get on a Dyno to dial it in. You will be very happy with the results!!

 

Yes, we have the MAFT and Auto taps in stock.

MAFT is shipped free at $175.

Let me know if we can get you one.

RG

 

Well I'm certainly no expert, but it's a rich condition that causes sooty buildup. Running lean will tend to leave a light grey film in the exhaust, and will also cause it to run hot. I'd check the O2 sensors. Given the increased air flow you've got with the mods, the natural assumption is too much air, but I don't think this fits the evidence. Is it showing any codes?

 

You could be mislead by what you see in the tips only in that it maybe due to slight oil useage causing that buildup.

To know exactly how your engine is calibrating as to PCM functions, obtain a PCM scanner tool such as the Ease Powertain enhanced scanner.
Like any tool, your best off using one that you trust in what it does and reason Ease has won 21 awards for its design and why G.M uses that vendor.

Within one good drive and recording the PCM you will clearly know what state your air/fuel ratio is and allow you then to make the correct decision as to tuning out the ill AFR.

If the PVC is sucking in oil into intake manifold, it will carbon up pistons and the more buildup there is, the higher octane you need and more knock you get.
Use a good carbon cleaner product, then use 1 bottle ( every third gas fillup ) of 104+ product to help keep carbon down.

Look via throttle body with a light, if you see oil traces within intake manifold, its the cause of some of what you see at exhaust tips.

Once you have done some PCM recording, you can properly adjust for a balanced performance AFR using a MAF translator. It's simple to use and the Ease scanner will report if your changes are in the correction direction or not.



[Modified by team-zr1, 11:59 AM 11/12/2001]