RB25det S1 won't maintain idle or rev

[SamGrant]

Hi all,

Having alot of trouble getting our RB25det r32 running properly. The car originally had a big laggy chinese turbo on it, so we pulled engine and tidied everything up and reverted to the factory rb25 turbo unit.

After reinstalling the engine we have the following issue:

- With afm plugged in, we can get the car started and then will die 10 seconds later. Can't rev it without is bogging down and dying.

- With afm unplugged, the car starts and idles fine. As soon as we try to rev it, it also bogs down and dies. As soon as the afm is plugged in again it bogs down and dies.

- Car isn't blowing any smoke

- Have kept an eye on the FPR gauge and it is jumping between 40-60psi

Have gone through many threads and can't seem to find anyone with similar problems. We have tested another AFM, checked for vacuum leaks and intercooler piping leaks.

 

Am thinking it could be the following things:

- Faulty fuel pump

- We bought a second faulty AFM

- Something to do with TPS and throttle body because as soon as that is altered car dies?

 

Any help would be greatly appreciated!!

Cheers,

 

[Odium]

For it to run with a Big Laggy Chinese turbo on it, it would need an ECU to control it and Injectors to supply a larger volume of fuel.

What ECU / Tune and Injectors are you running on it now, or have you just changed the turbo back to standard?

[SamGrant]

Yeah thats why we decided to revert everything back to standard to run on the stock ecu. So its now running stock exhaust manifold, turbo, throttle body, injectors and ecu. Very confused as to why it won't rev at all.

[GTSBoy]

AFM wiring has probably been hacked in some way.  Did it have a Z32 on there with the big turbo?  Or was it converted to a MAP ECU and someone found another use for the AFM wires? etc?

[SamGrant]

Thanks for the reply! Yeah that's what we are looking at now. Was running the original S1 green sticker AFM with the big turbo (didn't run the best). Thinking the wiring could have been damaged when we pulled the engine, however still recognizes when the AFM is plugged back in as it dies straight away so am hesitant to put it down to damaged wires. Will get the multimeter out tonight and run some tests

[Tristan363]

How many pounds of boost was it runnning with the stock green label because those run out pretty quick it sounds like it something to do with the afm.  Thats how mine acted when i was fitting a z32 maf to it. also what series ecu are you running?

Edited March 19, 2018 by Tristan363