Car won’t go past 6k RPM

[Yianni33]

Hey guys I have a problem with my r33 GTST  series 2, in every gear when I try go past 6k rpm it stops revving and starts back firing. 
 

I have changed the spark plugs, coil packs fuel pump 

 

 

Edited April 15, 2020 by Yianni33

[GTSBoy]

What voltage is the AFM getting to at that point?

What does the CRO say about the signal coming off the CAS?

What does the wideband say about the mixtures?

Have you tested for boost leaks?

Is the knock sensor going nuts?

Why are your coils in place but the cam covers not?

[Yianni33]

AFM is good, I don’t know what CRO is or how to check the wideband I’ve tested for boost leaks and found none knock sensor is fine too and sorry was an old photo 

[GTSBoy]

A CRO is a Cathode Ray Oscilloscope, which is commonly used to diagnose signal problems with CASs. Of course it doesn't have to be an old school CRO these days. You can buy USB cheapies that plug into a computer or phone.

And how do you know that the AFM is good? I asked what its voltage was at the trouble point. We need to know if it is saturating at 5V or something equally horrible.

You don't have a wideband. You would need to install one up the tailpipe and check the mixtures at the problem point.

These are all diagnostic approaches that you need to follow to track down a mystery problem.

[robbo_rb180]

has the CAS got the washers between it and the bracket?
Is the dwell setting correct for coils?

[MoMnDadGTR]

2 hours ago, robbo_rb180 said:

has the CAS got the washers between it and the bracket?
Is the dwell setting correct for coils?

ya I don't see the washer/gasket behind the cas this will cause issues. also I changed my coilpacks and plugs still had a misfire and wouldn't rev up same as you. ended up being the harness itself to the coilpacks.  looks like you have upgraded coilpacks, what ecu are you running? as gtsboy stated you need to check your maf voltage before you do anything mate. start with the easy stuff you cant just assume your maf is good. get your hands on another one and try that if you dont want to test it. this is where I would be starting.

[MoMnDadGTR]

sorry for the simple double post, check all your grounds and battery connections as well.....dodgy connections can cause a world of issues.

[Yianni33]

Sorry bad photo all the parts are back on with gasket I’ve swapped out the afm and tested it with another aswell I’m running an apexi power fc and now the harness I haven’t checked 

[admS15]

Does the power fc have a handset? Would be handy to check afm voltage and left field possibly of rev limit set a 6k rpm.

[Yianni33]

Yeah it’s got a hand controller rev limit is set to 7250rpm, gonna check the afm voltage after work and see where it’s at, what should it roughly be at? 

[admS15]

Below 5v at max power.

[John iatrides]

Did you change your fuel filter? My fuel pump took and shit on me I replaced it and didn't think to replace filter and I had the same issue. It had metal pieces in it.