Rebuilt TB42 with Turbo and intercooler or Chev Gen III V8

[Edward]

Need more horsepower and am considering two options. Firstly pulling the TB42 and installing a Chev Gen III V8 secondly and my prefered option have the TB42 rebuilt, blueprinted, ported and polished, head decompressed to 7.7:1, garret T4 turbo and intercooler. Similar to the Yellow GQ ute doing so well in the winch challenge events. What do you guys think?

[turps]

I voted the TB42, only thingyou need to remember the 2 GQ utes I know of have serious drinking problems. 1 a carby TB42 (Birdy's I think) running straight gas the other is a EFI tb42 (read Drafty and co's in members) with big fuel tanks.

[chimpboy]

I reckon the Gen III would slaughter the TB42, and with the Gen III you still have options for future power improvements, whereas with the TB42 you've gone to the limit already.

But it's just an opinion. Which option is more costly?

[chimpboy]

By the way be sure to keep us posted either way - I foresee a new powerplant within a year... gotta copy someone

[bubs]

http://www.outerlimits4x4.com/PHP_Modul ... hp?t=14935

here you go, yota power

[Edward]

Gen III is probably less problems and cheaper I think not sure thought. I am going to do some more reaserch on the cost and compare the two. I will post my costings when completed. The Turbo TB42 would be nice to keep the truck all Nissan and that Yellow ute seems to be doing the business. The truck is a SWB 1990 and not a daily driver so fuel consuption is not a huge issue but max fun is. I want to do a few rounds of the winch challenge events when it is finished just for the fun of competition.

[chimpboy]

Did you consider the VH45, which also keeps the machine all Nissan?

That is a very nice motor.

Jason

[Wendle]

be careful with the genIII, the sump is actually a structural member (kinda) so you can't just go cutting into it to clear the pinion or whatever..

VH45....

[Daisy]

be careful with the genIII, the sump is actually a structural member (kinda) so you can't just go cutting into it to clear the pinion or whatever..

VH45....

There are two sumps available to suit the gen3.

One is the US sump and pickup and one is the Aussie version - as in the late model commodores.

BTW I have one for sale in the FS thread if you're interested Edward (Im the bloke that came around to your farm to inspect and buy the ute for dave )

[Juzza]

Does anyone have at the wheels output figures for a Gen 111 in one of these trucks say running 33s or 35s? Genuine dyno figures would be better than hypotheticals.

[Edward]

I would be real interested to see dyno numbers at the wheels for a Chev Gen III in a Nissan with 4.6 diff ratio and 35 inch rubber but I think I will be waiting until I do my own conversion. I want 220kw plus at the rears.

[bogged]

you would honestly touch a Gen3? They are falling apart all over the country from people actually driving them..

Ask cheezy about his commodore.

[cbr]

you would honestly touch a Gen3? They are falling apart all over the country from people actually driving them..

Ask cheezy about his commodore.

As long as you put 3 lt of oil every time you fill up you should be ok

chris.

[Link]

Go the Chev

I took my SWB out on the weekend for its first run with a 350 TBI Chev in it, and it's just awesome fun.. Not sure about the Gen III though..

[jim808]

Take into account the piston slap problems of the gen3 but also where do you want the vehicles torque curve, thinking turbo could be a bit peaky in the rev range

[Juzza]

you would honestly touch a Gen3? They are falling apart all over the country from people actually driving them..

Ask cheezy about his commodore.

No i wouldn't use one if it was free, however i would like to see the power comparison to a intercooled turbo TB42.
It still intrigues me why people fall over themselves when ever Gen 3s are mentioned. There have been a huge number of these things go bang across the country and Holden has done a brilliant job of keeping it quiet.

[5upaMav]

Considered doing a twin turbo? Sounds silly initially, but if you read Zoom magazine, they twin-turbo'd an older XR6 ute and it made mountains of torque. They used fairly small snails to make the most of the lazy nature of the motor. "Workhorse Wakeup" was the title of the series of stories. Well worth a read.

[turbo gu]

if you want to go the chev power use the old design chev. they have a huge range of aftermarket bits plus you can gat alot of stuff cheap second hand off drag racer's when the update their combos. the gen3's very rarely blow up, they have a tolerance problem out of the factory. eg pistom to small for the bore.
when i was turning spanners on them you just replaced pistons and rings and honed the bores and away it would go. never saw any other faults.
the sump actually has oil gallerys in them for the oil filters so you don't to get them wrong.

[cbr]

if you want to go the chev power use the old design chev. they have a huge range of aftermarket bits plus you can gat alot of stuff cheap second hand off drag racer's when the update their combos. the gen3's very rarely blow up, they have a tolerance problem out of the factory. eg pistom to small for the bore.
when i was turning spanners on them you just replaced pistons and rings and honed the bores and away it would go. never saw any other faults.
the sump actually has oil gallerys in them for the oil filters so you don't to get them wrong.

You must be a bit better at turning spanners then the Holden guys (which I would guess is very true, have no faith in these guys). My mate has had his HSV gen 3 rebuilt three times, the last time with a new block. One of his mates has had similar problems and I know others who have had them rebuild multiple times.

Chris.

[turbo gu]

all you have to do is measure the bores and get the right pistons when i was doing them. i still work for a dealer but now off the spanners and our customers are getting new engines unless they want there engine rebuilt.

[cbr]

all you have to do is measure the bores and get the right pistons when i was doing them. i still work for a dealer but now off the spanners and our customers are getting new engines unless they want there engine rebuilt.

About time holden are doing something about it. My mate was continuely told (before the initial rebuild) that all new engines use oil and using 1.5lt per 3000 km was aceptable

Chris

[turbo gu]

using oil in the first 5/10000km isn't unusual but after that the usage should slow down. the holden spec for oil consumption is 2.5l per 10000km across the range. anything above that the is some sought of issue

[Edward]

I think I have ruled out the Gen III to many reliability isssues.

[cbr]

using oil in the first 5/10000km isn't unusual but after that the usage should slow down. the holden spec for oil consumption is 2.5l per 10000km across the range. anything above that the is some sought of issue

Just because the holden spec says does not make it right (IMHO). I still think this is too much oil usage. I don't own a new car, but wifes 91 silva, my VS V8 powered 4runner, my old 72 celica would be lucky to use 250ml per 10000 km.

So what is the standard for new cars these days?? If I bought any car that used 2.5lt per 10000km I would want my money back!

Chris.

[chimpboy]

I think I have ruled out the Gen III to many reliability isssues.

Okay, but I still vote against the TB42. I mean, I'd love to see you do it, but I think there are transplants that will get you better results for the same money and leave you room to squeeze more performance out in the future.

Of course it's up to you though

Jason

[Butt Craic]

My youngest brother weilds spanners for a living and has said that heaps of guys (more than a dozen) with HSVs and the GenIII have come to their workshop complaining that they loose oil pressure when they give it a boot full.

I don't know much about the mechanical side of things (leave that to my bro) but he looked the other way when we got offered one for a coil sprung swb 40 series buggy that we are building.

Like Wendle said, consider the VH45 over the Chev GenIII.

[bogged]

Like Wendle said, consider the VH45 over the Chev GenIII.

I think you would look at a pr of Hamsters over a Gen3...

[Edward]

Now looking into VH45 Twin Turbo from the guys down in ACT and also Melb nobody in QLD seems to have any experience in this conversion. Does anybody know if there is a bellhousing that will let you run the nissan 5 speed manual box instead of the uato from the donar vehicle? Maybe I will have a chat with the guys down at SEQ4x4 in Nerang as I live in nerang and see what they have to say, any input on this conversion would be great guys.

[chimpboy]

Now looking into VH45 Twin Turbo from the guys down in ACT and also Melb nobody in QLD seems to have any experience in this conversion. Does anybody know if there is a bellhousing that will let you run the nissan 5 speed manual box instead of the uato from the donar vehicle? Maybe I will have a chat with the guys down at SEQ4x4 in Nerang as I live in nerang and see what they have to say, any input on this conversion would be great guys.

There is at least one GQ running around with the stock gearbox and a VH45, so it can be done.

I have a feeling the ECU would need some input from the auto trans so there would be some tweaking to do there, too - the motor has variable cam timing and shit like that so it would probably be necessary to use the stock ECU.

But i dunno. Whatever you find out, be sure to let us know.

Twin turbos would be cool (twin superchargers would be better) but might push the price up quite a bit.

There's a thread or two on this specific conversion but precious few hard facts.

Jason

[Wendle]

I have a feeling the ECU would need some input from the auto trans so there would be some tweaking to do there, too - the motor has variable cam timing and shit like that so it would probably be necessary to use the stock ECU.

I am pretty sure sandy & co used an aftermarket computer to get around the no gearbox signals thing.. VVT shouldn't be a problem for any of the newer systems..