When I give say 50% throttle and then let the clutch and gas off, the car stalls, or drops to say 200 rpm and hovers up to say 400. Also, when it gets to the higher rpm's, it seems to buck quite a bit. I'm not going into boost at all, this is all while my motor is still under vacuum.... I tried tightening/ loosening the bov - it doesnt seem to make a difference.

 

Is this ONLY in 1st gear? and only at partial throttle? Where is your BOV located? (charged side/intake side/before maf/after maf/HOW FAR FROM MAF)


Do you have a GOOD wideband02? Do you have an EGT gauge? What does it read?

Are you getting good vaccum?

What injectors, Fuelpump, fmu (if using it), fmu disk, Fuel pressure, and MAF.

 

bov is located about a foot from the throttle body. The maf is about 14 inches from the inlet of the compressor on the non charged side.

I haven't hooked up any of my gauges yet - doing all that on friday.

 

The stalling and rpm dropping are most likely due to the MAF being on the non charged side. I know of several people with the same problem and the MAF was on the non charged side. I'm told that you can fix this with the AFC.

 

Do you recirculate the air from the bov back to the compressor inlet (in between the maf and the compressor)?

If not, then the air released by the bov has been metered by the maf but doesn't make it into the engine, resulting in excessive richness and bogging when backing off the throttle and idling. This could also be causing the bucking, since your bov is going to be open at partial throttle when manifold vacuum is present. Assuming your bov is the type that opens when there is vacuum in the manifold.

If you are recirculating the released air, your maf may be too close to the recirc reentry point and is sensing backflow, which would also cause it to run rich.

Try repositioning the maf to the charged side after the bov and see if that helps.

 

You can get either an Apexi S-AFC or eManage and use the "decel" function to correct that.

Or as SM said, add a compressor bypass between the MAF and compressor inlet.

 

Jay25 was NEVER able to get the decel function to fix that problem. IF it is the bov/maf, which I thought it was as well

 

You're probably correct Kirk...I only had a Fields to work with, which doesn't even have that feature.

 

however I have heard that emanage WILL fix it.... some member from DC said this

 

eManage will fix this, its the Anti-Stall feature, just requires tweaking the #s, only problem is that if its alot of blowoff and consequently alot of manipulation, then on a real cold start it idles rough for that time only.

I had that problem, just need to find a happy medium between the two.

Dixit

 

Update: Car still stalls - but only after going into boost, and then hitting the clutch. The prior issue of it stall even when normally driving as i'm coming to a stop, or revving up i believe had more to do with the vacuum line that I tee'd from the bov -to the stock little skinny hose that attaches to the stock intake to the nipple before the turbo compressor inlet. I believe that vacuum source possibly needed to be solely tapped to the nipple. I ran the bov, boost gauge line, fpr, and fmu lines all to the stock fpr line, and the car is running 10x better. I actually got into boost, and hit i wanna say 8 - 9 psi... good god this kid rocks. No damn wonder Jay25 gets all excited about his turbo... It spools ridiculously fast, and torque steer is definately an issue to worry about when driving now.

I'll take pics Sunday and post them up.... That's all for now folks

 

Good to know you solved that problem. Now you have what everyone was talking about. It may be more or less pronounced right now, but it will be a PITA when driving normal.

Congrats and welcome to the club. Be careful

 

All I did to solve this on my PFI kit was to relocate the MAF on the charged side, in the same location as the Stillen SC kit. That solved all of my problems with any stalling what-so-ever.

 

Emanage will fix that stalling issue. I have to modify one two more things on my kit and it will be on. After installing that Emanage package, the freaking thing spools very fast as if I had my Blitz SBC ID BC


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