blackbalts

I had my car tuned and should be at 11afr wot. Later found out that I had boost leaks. Since fixing them the car now pins at 10 afr at wot and people say I get some greyish smoke out the exhaust and smells like gas.

I have races this weekend, both drag and autox. Should I be concerned with possibly washing the walls or something equally as bad? Or should I be ok?

Its an 8 with 9 turbo, 10.5 hot side, upgraded piping, ported manifolds, 272 cams, full exhaust on 93.

Any advice would be appreciated!

Abacus

iTrader: (9)

Contact the tuner to see if he can pull some fuel out of the map.
Or
Get a laptop and a 2.0/1.3 cable and pull the tune. Then pull a small amount of full out of both fuel maps above 200load and reflash until you have the desired AFR. Most people shoot for 11.2-11.5 on pump gas. I personally shoot for 11.5 for the road course since as it heats up the stock ecu will add fuel. A couple gallons of good race fuel is also a good idea.
There are a number of how to video's on tuning an evo if you need the finer details. Here a great series that covers alot.

LetsGetThisDone

iTrader: (1)

Or lower your boost. Fixed leaks, now you're over boosting..

blackbalts

Tuner is too busy this week with the biggest race event in MN otherwise I would have bit the bullet and upgraded to a duel tune.

Thanks for confirming my suspicions. Should I turn the boost conteoller down to compensate if I can't find someone with the tuning software before Friday?

Bhsj13

so... if say... throttle body shaft seals were leaking and you get it fixed with no more leaks, your afr's would a richer during wot pulls?

Tuxevo

iTrader: (8)

No, the ecu still sees (hears) the same amount of air moving past the maf, but now more of that air is making it into the engine. If you fix a boost leak your A/Frs will lean out.

blackbalts

But my afrs went richer, that is the problem. Someone else suggested an exhaust leak. Not too sure feasible that is, thoughts?

Tuxevo

iTrader: (8)

An exhaust leak wouldn't cause your A/Frs to go rich either. If you developed a larger boost leak while fixing the others, that could account for what you're experiencing.
Unless you're not on a maf.....
Is your car on speed density? If so you could be hitting different load cells since the boost leak fix and if there are large variations in your fuel map that could be a culprit as well.

blackbalts

We used evo scan to identify how much of leak there was, fixed what we could find and then checked again. There is still a leak somewhere, but it was fairly insignificant. Car doesnt hesitate at all anymore so I would guess that the leak didnt get worse.

Im not familiar with "speed density" but there is still a maf on the intake.

evo8426

iTrader: (27)

Evoscan does not identify leaks, you physically have to build a boost leak tester to find leaks.

blackbalts

Sorry, let me rephrase. We used evoscan to watch knock and read air flow. We used a boost leak tester to find the issues and the did another scan to see the difference it made. I didnt mean we literally found them with evoscan.

V8HAHA

iTrader: (5)

Check all the evap crap behind your intake manifold. That stuff come loos and leaks all the time. I would use a boost leak tester too, that's the easiest way to find all of your boost leaks.

kaj

iTrader: (60)

It could show a false reading then show rich, when fixed, if the leak were before the wideband.

blackbalts

Wideband is on the down pipe so I doubt there is a leak there.

Back to the real question though. If I'm running that rich will the motor be ok under heavy load for 10 to 50 seconds. I only plan on a couple drag runs and a load of autox. Courses over the past three years have been roughly the same and no nore than 50 sec.

kaj

iTrader: (60)

You could be leaking at the manifold, o2 housing, etc.

Anyway, if you are smoking from running too rich, that's a bit much. Personally, I wouldn't run it hard. But thanks just me.