GQ3.0

We have a '91 RB30 Patrol alongside our '95 TD42T. I reckon the RB30 is fantastic on sand - where revs save the day. It certainly eats the diesel in these conditions. It uses more fuel too... but... anyhow...

I've removed the pre-heater gauze at the base of the carby and fitted a Genie extractor system. Made a pretty noticeable difference. I then had the carby re-build from top to bottom. That made an even bigger difference. Someone here will probably chime in and tell you the name of the guy why specifically used to specialise in these carbys and could get them to put out more than the injected RB30 could.

My next exprimentation is to fit injection from a VL motor and ECU we have. This is not to gain any more power - but to stop the surging going up steep inclines where the float bowl empties pretty quickly on an aggressive climb. Once this is done I'm looking at whacking a positive displacement supercharger (like the 1GZ Toyota unit) on it. THAT should give it more goolies :) Castlemain Rod Shop has a kit for fitting one that looks very nice indeed. See the link.

Cheers
Chris

thanks for that responce do you think supercharger would be better than turbo

fantastic thanks chrispy i would never have considered that , as i am writing this one eye is scanning the yellow pages for a fuel ingection set up .
thanks mate

Cheapest and Easiest thing to try is premium and drive it the way the motor was designed - rev - it. Take it out to 5000 rpm when you need power - it will not hurt it. (Redlines at 6000rpm and Nissan have rev limiter on distributor so you cant hurt it.)

If you really insist on spending money and want some serious grunt. Just do the following -

Do a compression test, if all cyls over 170 +/-10psi Just put a set of good Extractors a 3 inch free flow sports exhaust and run it on premium. Run it out to 4,500 rpm and use 5th gear as an overdrive only - it will be lots of fun and have heaps of grunt. This is a short stroke high revving motor (compare it to a Kawasaki 4 cyl motor bike (12000rpm) and a 2 cyl Harley Davidson (2000rpm) some motors just lope along - this one does not) and will sit on 4,000rpm all day. Used normally 450,000ks common before needing to do the bottom end.
If you get a chance get rid of the heater elements and the deflector at the base of the carby in the top of the inlet manifold. This will give you about 10-15% more grunt below 2500rpm once the motor is warm.

If compression is down to below 150psi rip the head off and just do the valves (rings should be ok) and if not already done - replace timing belt and waterpump (what Im suggesting here is for maximum overall reliability. - dont bother any other mods as this motor will never let you down this way.) - unless its been badly treated this is all it will need before at least 300,000ks if not 400,000+

Great motor just misunderstood - Ive known people to hold their foot flat in 5th all day at 2400rpm and say - its gutless - yet this motor has a serious powerband at approx 3500rpm+ and would have used less fuel in 3rd gear or 4th - You dont let this motor lug. It needs to rev.
have fun
Nick

Hey 'wok boy', you are at it again I see.

A Turbo Kit for/From a Turbo VL Commodore or RB30 Skyline would bolt strait onto this motor I Think.

another thing to do is find someone who specialises in dizzys and get them to go over it they can do amazing things to them.
cheers

Hi Yebach,

Talk to Russel Guest 4 x 4 in Fairfield Vic. He was the guy who tweaked the 3.0 GQs.
I had one for 10 years. After extractors and Guests tweak it went really well. Also ask him about the plate at the bottom of the carby in the manifold. Mine disintergrated and passed through the motor, luckily without damage.

3.0 GU was a great vehicle.

How much do you want to waste...err I mean spend?

You can go the full NISPRO (same as VL Commodore) turbo and the works, will get you over 200kw at the wheels.... but will cost you way more than its worth.

hi
I think your vehicle is a Deisel so just get a chip up date the Nisson people have down tuned the engine

wow thank you all for you responces much appreciated, i'll be starting with the cheaper option first and take it from there.
just one more thing i asked castlemain a question but no responce yet,can you run superchargerrunning duel fuel.
thanks again all.