New car, tuning problems

[1969olds]

I just bought a 98 gst. I come from the muscle car world, so all this electronic stuff is completely new to me. The previous owner installed Greddy exhaust (turbo back), Greddy BOV, AEM boost controller, 14b turbo, ACT 2000 clutch, lightweight flywheel, supposedly larger injectors, walbro pump, and a FMIC. After reading through the forums, I have figured out that I am experiencing fuel cut. I am assuming the problem is with the tune, and I don't really know where to start adjusting on the Apexi SAFC 2. What should I start adjusting to get rid of this problem?

 

[boostingsx98]

First you should check if all maintenance has been done. Timing belt, oil/waterpump, gaskets, plugs ect. Check compression, should range around 140 to 175psi. Also do a boostleak test on the turbo system, you can make one yourself for around 15 bucks. Pressure test the system to 20 psi and it should drop down 1psi per min. (you may have a boost leak) Make sure you have an aftermarket fuel gauge to hold that fuel pressure coming from the 255 walbro. Pressure should be set around 43psi. (you may be dumping too much fuel causing you to bog down) Also check the injector size, if they are larger than 650's you will not be able to compensate for then with an SAFC 2.(maybe look into dsmlink) In order to know what's going on with your fuel you need to buy a Wideband to monitor fuel mixture. During boost you will want to aim around 11, during idle around 14.7 Do you have a boost gauge? What is it set at? On a 14b I would not go much past 20psi, it will be out of its efficiency range. After you have check that everything is compatable you can check out this link for some info on how to tune. You can also search the forums there is plenty of info as well.
http://www.dsmtuners.com/forums/articles-tuning-ecu/58403-definitive-piggyback-tuning-guide.html

 

[1969olds]

I have a air/fuel gauge, and a boost gauge. Boost max is set at 15psi. How do I figure out what size injectors I have? The guy I bought it from said that they were larger than stock, but he didn't know how much.

 

[95talongirl]

Pull one of the injectors; most *should* have some numbers or a part number on it that could be of help in ID-ing the injector.

 

[1969olds]

And also, the BOV is currently not recirculated, could that be contributing to the problem?

 

[awdspyder98]

And also, the BOV is currently not recirculated, could that be contributing to the problem?

car would probably shut off as soon as you push in the clutch when coming to a stop. Most people have this issue but some dont.. thats if its not set up to vent to atm.

 

[Hesh724]

I have been running a blitz Bov for like two years not recirculated and i have no issues at all exept if i get on it real hard then shift into N instead of the next gear it can stall occasionally. also it richens a small amount between shifts but thats it i dont know why recirculating is such an issue for some?

 

[1969olds]

I have been looking at all of the setting on the SAFC II, and I may be wrong but I think the Hi-throttle and Lo-throttle maps are way off. They both start out at -7% at 1000rpm, and are at -36% by 2800, and stay at that number for the next few thousand rpm. These numbers aren't normal are they?