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Need Help Got Some Questions About My Rb20det

dmac_25

By dmac_25,
in Engines & Forced Induction

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dmac_25 Grand Master

dmac_25

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Posted

Hi,

Got a few problems with my RB20det 1st off i did my head gasket in it about 2 months ago so i put my spare 20 out of a wreck i brought had that engine in the car for a week and blew a turbo return water line and put a hole in piston 6.

So i was forced to put a new head gasket a Tomei 1.2mm with some hylomar on it and i put a hypergear tr43 turbo on it. I also wired in a z32 afm plug and still have the standard rb20 afm plug on it as well.

My problem is that the car runs but it idles at about 2000rpm and when it revs above that it cuts out at about 3-3500rpm.

My quick diagnostic is that the 2nd afm plugs are causing the computer to read the afm wrong, or that the computer is still in limp mode after the engine failure of the last engine or with all the plugs being disconnected that one or 2 havent got good connections.

Any ideas or thought about this issue that might help would be great full.

Also ive got a standard comp with a remap.

Cheers David

dmac_25 Grand Master

dmac_25

Posted
  • Author
Posted
Was it remapped AFTER you changed afm's?

Hi mate,

I didnt change the afm just wired in the z32 plug into the loom still running the r32 afm.

It shouldnt cause a problem having the 2 plugs in the loom but im not sure now.

Cheers

dmac_25 Grand Master

dmac_25

Posted
  • Author
Posted
Too much boost and hitting Boost cut? have the AFM maxed out? or maybe faulty AFM? are you running ext WG?

Hi Stao,

Not running ext wastegate just the standard internal one not running a boost controller just what the standard 10psi ive got a spare arm will change it to see if thats the prob it was working fine a month ago tho.

Cheers

GTScotT Grand Master

GTScotT

Posted
Posted (edited)

hmm mine would idle at 1700 and cut at 3g as well, went i had a broken wire going to the afm

maybee u broke one of the wires when putting the 2nd plug on

Edited by GTScotT

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