Gu Patrol exhaust tuning

or ask here and get the info..
or search here and find numerous threads on the same subject.

yeh yeh alright ive done it ok had 12 mths of lurking now ive paid for the membership ok haha
guess i was waiting for a reason oh yer and i am a tight****
Cheers for the archive posts too Barn

Good onya Barn, welcome to the members lounge hehehehe.

I will MM Wayne and alert him to this post to get his contacts on here for you while you await the members logon details LOL!!

See you at the members bar one day soon LOL!!!
Trevor.

Dear Coyote,

Not trying to minimise your opinion because some people validly do have this opinion of the old 4.2 slugs, but I am curious if you had the dump pipe fitted as well as the 3" exhaust. If not, here may be the problem. This dump pipe in standard is quite small compared to the aftermarket jobs and the difference is quite noticable when you drive an unmodified side by side against my worked 4.2 Patrol. I have a dyno printout on my rig pics to give you an idea but essentially I am almost 100% over factory settings and I have been running like this for miles. I currently have 340 000km on the clock and mine was worked on for the first time, pre delivery when brand new so longevity is a non-issue in my opinion.

If you are in Brisbane, Mike Vine turbo's will set you straight and fix any lack of performance issues you have with the 4.2 so long as you understand it is a workhorse and not a racehorse.

Best regards,
Trevor.

Thanks Trevor, I am now in Brisbane.. I had the 3" exhaust system fitted in Adelaide early on and I got Dyno rpint outs et and there wa sonly a marginal improvement. I accpet that if there is more improvement to be had it is out of my ignorance in not asking them to do further tuning etc.. addmittedly, I rushed it as I wasn't even iun the statte when my wife dropped the car off and then she picked up inthe arvo and they gave her the rpint outs. they told her a list of stuff they had done and I accpeted it on face value. Thecar now has 70k on it and I drive it like a workhorse not a race horse. I will take up your suggestion and tget the guys you mentioned to check it out and see if there is something I'm missing.. Thanks for the tips...

Coyote, you didn't answer the question as to the dump pipe which is the pipe at the back of the GU turbo. It is extraordinarily restrictive on the 4.2 at about 1.7" diameter. A 3" dump pipe takes a heap more gas out of the turbo.

Mine with a 3" dump pipe gave a 16% improvement in the 0-100kph time. Without a dyno, it was the only way I could quantify the improvement. It made a hell of a difference to the drivability.