won't pull past 5000rpm

[datdrift]

just got around to changing the fuel pressure reg and injectors and it dident make a difference, so now im stuck for ideas
anyone have any suggestions

[PukkaSilvia]

Is the orininal problem of not pulling past 5k still there?

[datdrift]

that is the problem, the idle's sorted, but it cant pull the higher revs on full load without hesitating and spluttering

[PukkaSilvia]

Carb clean air flow meter, degrease ht lead contacts. Make a good coil earth, coil earth sounds the most realistic other than timing. it could be the cam timing if someone has not fitted the belt properly when changing it.
Other than that i would say it was a boost leak but not a vaccum leak..

Other than that i think you have already checked the other possabilities.

[30psi]

Originally Posted by datdrift

that is the problem, the idle's sorted, but it cant pull the higher revs on full load without hesitating and spluttering

I was gonna ask this very question.

If it will go past 5,000rpm on light loads then the problem is most likely to be fueling. Either too rich or too lean.

Does it sound like a rev limiter or is it more severe and just a complete loss of power?

[datdrift]

yeah it can pull around past 5k when its not under full throttle.
it was doing a similar thing when i had to run it on some 95ron fuel when it came on boost, but now i only ever run it on optimax.....
it doesent sound too bad when it happens just maybe little poping backfires down the exhaust?
i havent got a timing light so i don't know what its set at, ive tried twisting the dizzy to the left to retard it but it diddent seem to make a difference