Noob with DSMLink needs help

[hollywood_ikr]

I just got within the last 100 miles: FMIC, FIC 950's, wally 255, AFPR, and DSMLink. Since I don't have any sweet skills as a mechanic I had a local shop street tune it and install all the parts for me. I got the car back yesterday, and it wastes gas like a v8, misses all the time, and boost spikes to 14 and then immediately drops to like 9 with my mbc all the way up. They say the unstable boost pressure is my mbc and that I should replace it. I am starting to doubt them. Also my car had better gas mileage, went faster, and overall felt better before I dropped about $2000 into it. I don't have a wideband is there anyway to tune the car myself without one? Any advice?

thanks...

 

[snowborder714]

It is not recommended to tune the car without a wideband. Otherwise, you're basically blind tuning since the DSMlink A/F ratio is not very accurate.

 

[LocknessMonster]

I would def get a wideband, its always nice to see what your afr's are anytime. After you see what your car is running a/f wise then you can tune from there.

 

[hollywood_ikr]

Ok this might sound completely retarded. But since my car basically runs like shit right now... Is it possible for me to use another dsmer's settings on my car?

 

[snowborder714]

I would not recommend that either as each car is different. And that's just as bad as blind tuning (not using a wideband).

 

[No_Skillz]

If you have a horrible tune and are stuck in a tough spot (and it sounds like you are), you can get a rough tune without a wideband. Aim for the rich side. It will run much more smoothly than what you are currently describing and is probably better for the health of your car.

I recommend:
1. Make sure your AFPR is set to 43.5psi with the vacuum hose OFF (should net ~34-35psi with it on).
2. Make sure the spark plug wires are properly reversed.
3. Reset all settings on DSMLink.
4. Invert CAS via DSMLink.
5. Enter appropriate global and deadtime values for your injector (-53% and 315 for your specific injectors).
6. Do a BLT.
7. Test drive and adjust accordingly for LTFTs:GMAF Calibration for LTFT

This will result in a basic tune for your car, similar to what is from the factory. It will be very rich (as it is from the factory), but should run without symptoms. In the future when you get a wideband, you can start tuning for better performance.

If you still have issues controlling boost at this point, post back with DETAILED symptoms including how you have your MBC hooked up. Remember: An undefined problem has an infinite number of solutions.