99 GST Built. Problem?? Car shut off while boosting

[99GST400]

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So last night I took the GST out. I did lets say 6 pulls and 2 times the car shut off on me. Like the battery light came on and it shut off. I just pulled over to the road and Started it up again and it drove fine. Is it because my alternator is going bad? Or the belt was spinning too fast from the pull? Not quite sure. I was at around 24psi.

 

[BoostzillaTSX]

Have you checked the battery cables? Possibly the starter wires or alternator wire? Usually if the alternator isn't charging it's not gonna crank back up due to the dead battery, and a lot of times you gradually lose power throughout the car while driving.

 

[usmcjay]

Make sure the power transistor connector is on properly. My car died during a pull because of this.

 

[99GST400]

I don't really know much about cars sorry. I mean is that like the connectors on top of the battery? Like positive and negative? Cuz the battery was relocated to the back and it's not like strapped up that great. But it's sitting upright just fine. Not exactly sure what to check from your replies. Sorry.

 

[evo9801]

So last night I took the GST out. I did lets say 6 pulls and 2 times the car shut off on me. Like the battery light came on and it shut off. I just pulled over to the road and Started it up again and it drove fine. Is it because my alternator is going bad? Or the belt was spinning too fast from the pull? Not quite sure. I was at around 24psi.

What's all done the car? Is it a 6bolt swap? Had this happen to me once because the cas plug came loose on a pull.

 

[99GST400]

Just posted pictures of what's been done to the car. I've done pulls before and it never really happened. I upped the boost a little and it happened. Maybe it's something with the boost controller shutting the car off cuz it goes like into warning like area or something?

 

[BoostzillaTSX]

It could be possible that you are trying to boost higher than what the car is tuned for, and you are hitting fuel cut.. possibly the ecu is shutting the car down because of a higher boost level!? I'm new to the dsm world to so no worries . I've had plenty of boosted cars I've built just never a dsm.

 

[99GST400]

I updated some pictures and yeah.

 

[dk7868]

Sounds to me like a wire or something might be shaking loose. I don't know if the car would shut down because of too much boost unless you put something like that in the car as a fail safe..

I would start by tightening all your grounds that you can.

 

[BoostzillaTSX]

I have read in a few different places as a safety factor it can be done in the tuning of the car, possibly not to hit a fuel cut .. but my original thought was a loose connection somewhere.. The car never throws a cel?

 

[99GST400]

No it's all tuned and stuff properly and like when I was running on 17 pounds of boost it was fine and never shut off. I upped the boost to 24 pounds and it did that twice. The this tune can max run 24 pounds so maybe it spiked and the car shut off due to the tune?

 

[dk7868]

could be.. drop it down to like 20-22lbs and see if its doing the same thing..

 

[99GST400]

Alright I'll test it out and see what's up. I'll let you know.

 

[SOADweskey]

Using ECM Link and a Greddy PROFEC B Spec II there isn't really a shut down the engine for overboost option easily built in. That isn't to say that the previous owner couldn't have rigged something up but I find it unlikely. I think other members have hit the nail on the head and that is you have a loose connection to a sensor or the power transistor and it vibrated during the pull enough to break the connection momentarily and your car shut down.

On a side note since you are turning up boost and doing pulls you need to make sure that you have Link configured to turn on your check engine light if the ECU pulls 1* of timing for knock so you can see it and lift the throttle right away.

And to answer your question about the power transistor it has nothing to do with the battery. It is a small plastic module that is normally bolted to the intake manifold. It will be relocated in your car due to having an aftermarket intake manifold. Do a google image search for 2G Power Transistor to see what it looks like.

 

[AdR]

A friend had it happen a few times on his GST and it was the power transistor that was bad and upon high load/rpm it just faltered. It seemed as the extra cycles required at high rpm just made it fall on it's face or something. Vibration really had nothing to do with it as that would just happen driving normally or "spiritedly". Did it only happen upon high boost and high rpm?

I sincerely doubt you have the fuel cut using DSMLink and with no pop or big bang in your description it doesn't sound like your problem. Fuel cut is something you really notice and it doesn't turn off the car, it just cuts fuel off and makes you hold back.

 

[99GST400]

Using ECM Link and a Greddy PROFEC B Spec II there isn't really a shut down the engine for overboost option easily built in. That isn't to say that the previous owner couldn't have rigged something up but I find it unlikely. I think other members have hit the nail on the head and that is you have a loose connection to a sensor or the power transistor and it vibrated during the pull enough to break the connection momentarily and your car shut down.

On a side note since you are turning up boost and doing pulls you need to make sure that you have Link configured to turn on your check engine light if the ECU pulls 1* of timing for knock so you can see it and lift the throttle right away.

And to answer your question about the power transistor it has nothing to do with the battery. It is a small plastic module that is normally bolted to the intake manifold. It will be relocated in your car due to having an aftermarket intake manifold. Do a google image search for 2G Power Transistor to see what it looks like.

Alright I'll google it and see what I can find.

 

[99GST400]

A friend had it happen a few times on his GST and it was the power transistor that was bad and upon high load/rpm it just faltered. It seemed as the extra cycles required at high rpm just made it fall on it's face or something. Vibration really had nothing to do with it as that would just happen driving normally or "spiritedly". Did it only happen upon high boost and high rpm?

I sincerely doubt you have the fuel cut using DSMLink and with no pop or big bang in your description it doesn't sound like your problem. Fuel cut is something you really notice and it doesn't turn off the car, it just cuts fuel off and makes you hold back.

Yes it only happened at high boost at high Rpms, I've done pulls before with the car set to safe boost which was like between 13-17 psi and it never shut off during any pulls. We drove it for 2 hours once and my friend did some pulls on the highway and it never shut off.