'90 Turbo FC falls on face around 6k RPM
 

Hello everyone,

So some quick notes.I just got my car back from the shop for some upgrades. After said upgrades, I noticed the car is having some problems. Also I am not the most experienced mechanic, so try and bear with me.

What was upgraded:

Fuel Injectors: 2x 1000cc and 2x 850cc
Fuel Rail
Fuel Pump
Fuel Lines
Spark Plugs and wires
Exhaust - catless, downpipe and midpipe
Fuel Cut Defender

Engine was rebuilt before upgrades, no porting done. Now around the 6k rpm area, the engine just gives up, like there's a rev limiter. It happens every gear under load, neutral it's fine.

Any clues as to where I should start looking for problems? Coils perhaps?

I can provide pictures and additional info if needed as well.

This was also posted on the new member forums, but it seems that doesn't get much attention, haha

why so much injector? how much boost are you running and what turbo?

Honestly I couldn't tell you why the injectors. I took it to a shop to modernize it and that's what they went with.

It has stock ECU and stock turbo. I've seen the boost get up to 7 psi.

Fuel pressure is around 35 psi at idle.