1G Just got a 90 Laser RS turbo breaking up at 5k

[Lazer owner at 15]

i just got a 1990 Laser RS turbo it has had problems around 5k rpm with the engine cutting power for a split second. i was hoping to get help with this and i was wondering what the most appropriate forum section would be

 

[Lazer owner at 15]

i have been looking into that i just haven't pulled the trigger yet but i will keep you posted when i do with results

 

[Lazer owner at 15]

I just installed a AEM boost gauge and in the problem rpms (5-6k) (i stop pushing it when it cuts out) its reading 17psi so it is an over boosting problem.

I do not believe the wastegate or the recirculation valve are stuck because it holds a good 13-14 psi throughout the rpm range until 5-6k rpm.
No matter what I'm getting a AFR gauge and DSMLink this winter for future tuning but I'm also wondering if I could just add fuel in at the problem areas to combat the lack of fuel (compared to air in the problem rpm). I need to do some reading on fuel pumps and injectors to see how much I can push them and if they can supply enough fuel for the 17ish psi I'm seeing.

PS I know none of that would fix my problem of over boosting it would just fix the leaning out at 5k+rpm under max load.

 

[TerminalTalon]

You just need to go through the maintenance, plugs&wires, check the belts, fix the boost leaks, get a manual boost controller for now and as soon as you can get DSMlink. It comes with a base map to get it going. You might be chasing some small issues but keeping the boost low and learning how to drive and how the car reacts is all you need right now. Do real maintenance to make sure it’s safe too.

 

[Lazer owner at 15]

After installing a AEM boost gauge, fabricating my own o2 housing and adding a 44mm tial external wastage as well as doing a lot of porting to the stock turbo housing to open up the internal wastegate port the car is staying around 13-14 psi right before redline with the wastegate opening up at 12psi

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[Lazer owner at 15]

The problem was over boost, I fixed it by fabricating my own o2 housing with a external wastegate although I did have to open up the internal wastegate alot to get it to flow enough.

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