Patrol GQ ST-3 vs 4.2l?

My next door neighbour bought a 91 3litre gq 2 yrs ago and we always go away together and he continuously complains about lack of power.....
It is shocking up hills without a trailer,, just keeps losing power until he is back another gear...... Couldnt even contemplate one with a trailer.....
You can pick em up cheap because no-one wants them....
It took 12years for Nissan to make a 3litre work effectively and even them some would argue the fact...

Sorry,, If you can find a good 4.2 and willing to pay the extra, go for it. probably similar economy and better for towing, Michael

Poe

We have a '91 GQ with the RB30 engine. While it doesn't have the power of the 4.2 (possibly...), it has been ultra-reliable. I have installed a Genie header and gotten quite a few extra horses out of it. I have also removed the pre-heater gauze at the base of the carby and gained a few more. A good tune and carby re-build (I paid about $250 for a full rebuild) and it goes very well. It has 33" BFG muddies and still goes up hills like a rocket - irrespective of what else has been said here. It does need a few more revs for sure... but overall the economy isn't too bad - about 16L/100 on the highway (to Cooma - all up hill into the mountains) and anywhere from 25-30L/100 on sand - which all fourbies chew fuel on. Just as a side issue, I have better success with my 3.0 on sand over the guys in their 4.2's... because I can rev the absolute ring out of the engine up the steep dunes in a relatively low gear - keeping a good head of steam right to the top of most dunes on Stockton beach's soft sand. Don't keep an eye on the fuel gauge when doing this however...... :(

Rocky trail performance is not as good as the slower, more torquey 4.2 either. A little clutch slipping to keep the revs (and torque) up is the order of the day. Not too bad, but it can be a problem which leads to another clutch replacement over the life of the vehicle. I have a CenterForce installed in mine now and it's been better and able to take more abuse than the standard unit.

The only thing that you won't be able to do with any ease is tow a heavy trailer. The engine - while it has a fair amount of (read: adequate) power on its own - it doesn't have a great deal of torque - and needs to be kept spinning. The other factor is the gearbox - which comes out of a Nissan 300ZX. While it is smooth and oh-so-carlike in its shift accuracy and speed, you would have, on the odd occasion, a good chance of stripping 5th gear (O/D) with too much weight on the back....like a heavy (700kg plus) trailer.

Don't write it off as a Nissan mistake - it really is a very good 4WD in its own right. It handles better than the 4.2 (with less weight over the front axle) and accelerates just as hard as the 4.2 on-road given that lighter weight. The RB30 engine is a gem that will probably out-last the chassis..... I'm looking at fuel injection too.. to overcome a tendancy to empty the carby's float bowl on really long steep slopes. There is a supercharger kit available from Castlemaine Rod Shop for the RB-30 as installed in VL Commodores that sounds like an option for me too - as it should lift bottom end performance significantly. The engine itself is perfect for doing perf. mods to as it is so strong.

May be it isn't the right choice for what you need to do, but a good machine nonetheless.

The 3.0 is the same engine as the VL Commodore and Early Nissan Skylines.

You can buy heaps of go fast bits for them from Nismo etc.. But if your talking stock V stock, no substitute for cubes...

You are lookin at Petrols, they get average of 20/100ltrs they are thirsty. 3.0's were getting similar in a poll we had on the patrol list few yrs ago.

TB42's have issues with heads failing on them, the fix is around $1000, but if your head is fubar, they are hard to find in good condition second hand.

Resale on 3.0's is hideous on any forum.. Bloke in our club had his forsale for 8 mths, gave up and traded it in. Many people are now doing either diesel conversions or 350 chev conversions with the 3.0's, cheap donor cars.

Either will serve you well. I'd look at a diesel.

If you are going to go Petrol , then a 4.2 Petrol , probably Dual Fuel , would be a better idea. Will tow easily , and get the same and possibly slight better fuel economy. It would be far less stressed , and all the other components will stay together.

Or you could try and located a Diesel.

All post so far I'd agree with. I just sold an RB30 patrol after 13 years of use. I couldn't fault the motor with reliability, ease to service, cost of servicing, free reving, not an oil leak, etc, etc. I also had some mods done to increase output, worked a treat after that but as per other posts if towing you really had to work the vehicle. If you kept it up in revs, redline is well over 6000, you could really make it fly. Top end was actually frightening, in the NT fully loaded I got to 160kph and still had peddle. But towing, did I mention towing, is poor, yes it'll tow but you need to drive it. So no day dreaming, use the gears keep the revs up, don't watch the fuel gauge and you will keep up with other. With out doubt if used for what it was marketed as you can't go wrong. Remeber it was marketed as a people mover, mum's taxi with some light 4x4ing. We had it at the cape, simpson desert, gulf and many off road adventures over 13 years and it never, never stopped on me. The only things I changed was a clutch, brake pads, water pump, radiator and a number of passenger engine mounts. Apart from that I just hope the 4.2 turbo diesel I've brought now is as reliable!!

last I checked there were no shortage of nissan patrols for sale so unless it is unbelievable value I personally would look for a bigger engine. The rb30 was made for pushing 1400kg of family around so I wouldnt doubt it might struggle with a full load with a 4.2 pet or diesal you will have no regrets later. The rb30 had a cronic head cracking broblem in comodores at around 170k this however doesnt seem to be the case in other vehicles it has been put in the info I have heard is it is due to air locks developing because of the low position of the radiator in commodores . would still be worth checking for bubbles in radiator oil in water etc. Otherwise it was one of the most highly regarded motors of its time

Thanks for all the responses. Great info.

The one I'm looking at is $7500 in immaculate condition with high kms (freeway driving) one owner and log books ... but me thinks me likes the bigger engine.

I'm a bargain hunter, so that's why I'm looking at this price range. Would prefer a diesel (TD even better) ... love that torque, but haven't seen any around for such a low price that looks any good. If it doesn't look good I find it hard giving it the attention it should have.

Anybody have any great ideas/places to look/people to ask/alternatives? I'll give member Mr ERIC a bell and see if he has anything (I know he's on hols on Straddie).

Cheers,
Poe :)

Hi Poe,Ive got a 4.2 efi gq,its a great wagon had it for 3 years now,with out any real problems apart from a fuel pump needing to be replaced.Its done 180,000 kms to date.I feel if you need to add things to in cease power out put ,forget it because it will cost you more in the long run.My gq is std we also tow a camper trailer without any problem in sand or hills,at times I forget that it is there.the 4.2 has both power and torque.But on this forum they will tell you than you can not do this and can not go there because you drive a petrol wagon.I find it a bit Baised .Sorry that i can not say much about the 3 Lt gq as Ive never had one
regards uppy

G'day,

I'm in SE QLD and have a tidy GQ 4.2 Diesel for sale. For under 10k. I'd consider this a much better alternative to a 3.0 liter petrol. Details in the for sale section on this site.