Outer Limits 4x4 Board

Has anyone explored using a twin turbo setup on the TD42. I have heard of it being done with a Supra setup but am not aware of how successful it was. I am not familiar with twin setups, but would it enable the use of two smaller turbos that would spool up quicker than one larger one but still provide eqivalent flow at higher rpm. At the moment I run a DTS kit with 3" dump + exhaust which makes 13psi at about 2100rpm it is making 8-9psi around 1750rpm. What are the characteristics of the setup that some of you guys are running.
Thanks for your input.

2 small ones wont work like that. they will still run out of sniff at the same time.

What you want is sequencial setup...

1 small one for lower sniff, and then a larger one for top end..

Yes, the guru at Diesel-tec in Lilydale has done it on an 80 series and GQ shorty with TD42....

I'm not sure how many people have tried, but Andy (Diesel-tec) would be the bloke to speak to. He took me for a quick squirt in his SWB when i was down there and it was bloody impressive - should be a massive improvement again once they get the Laminova on (if not already).

I hope you have deep pockets, post pics when its done.

maccapacca wrote:Has anyone explored using a twin turbo setup on the TD42. I have heard of it being done with a Supra setup but am not aware of how successful it was. I am not familiar with twin setups, but would it enable the use of two smaller turbos that would spool up quicker than one larger one but still provide eqivalent flow at higher rpm. At the moment I run a DTS kit with 3" dump + exhaust which makes 13psi at about 2100rpm it is making 8-9psi around 1750rpm. What are the characteristics of the setup that some of you guys are running.
Thanks for your input.

seriously why would you bother.

All that fabrication, the issues of more things going wrong. If you want more power add decent intercooler put a roller turbo then will spool up earlier and give you smoother power from a larger band.. And if you want more power on top of that add a modified injector pump...

have a look on the mudrhino readers section, a guy called narnturbo has a 3L gq running twin ct26's

Weeman I am aware of my options in regards to a conventional setup, just exploring the solutions that are available. Approximately where does the power start with your roller bearing setup is basically what I'm asking. I have not driven a Patrol other than the one I own and need some comparisons to work out which way to go. I would like to try and make the range off idle more usable than it currently is if possible.

maccapacca wrote:Weeman I am aware of my options in regards to a conventional setup, just exploring the solutions that are available. Approximately where does the power start with your roller bearing setup is basically what I'm asking. I have not driven a Patrol other than the one I own and need some comparisons to work out which way to go. I would like to try and make the range off idle more usable than it currently is if possible.

Go for a spin in Andys, that will tell you "why you would bother"..

I'm using a pair of 1jz supra turbos(CT12a's) on my 3lt (petrol) GQ Patrol, and they perform well from the limited testing that I've carried out so far.They come on early, and fairly liner, feeling almost like its supercharged with the way it delivers its power, which is exactly what i wanted. The last thing you want is the power coming on like flicking a switch.

Maccapacca is right with what he says, two smaller turbos capable of flowing the same amount of air will spool up quicker than a single because there is less enertia effect to overcome. Nissan (rb26) and Toyota (1jz) did this for that reason.

Most factory sequencial setups are quite complicated in the way they are controlled, and usually work on restricting flow to one turbo and opening it up once the revs are up.

I've always been one for doing things outside the square, and doing the same thing as everyone else is some times boring. Sure there is a bit more work required in the fabrication side of things but its not much in the scheme of things, and im sure the results would be worth it, considering that 1jz turbos can be bought for as little as $300, and a new roller turbo would be worth around $1500.

Hers a link to my thread http://www.outerlimits4x4.com/ftopic170799.php

maccapacca wrote:Weeman I am aware of my options in regards to a conventional setup, just exploring the solutions that are available. Approximately where does the power start with your roller bearing setup is basically what I'm asking. I have not driven a Patrol other than the one I own and need some comparisons to work out which way to go. I would like to try and make the range off idle more usable than it currently is if possible.

Well the depends on the trim of the turbo and what wheels you use.

On another truck that was running same type turbo as mine, was running about 2-3 psi off idle however was running 35psi.

If your trying to correct off start boost, instead of playing around with turbos have you considered what your ratios to your tyre size, if your running 35's and 4.1 maybe a bit sluggish off start even 33's however if you went back to 31's you would be surprised how your turbo maybe working a lot less to move you along.

However there are a number of things not just getting the right turbo if you really want a good mix, you need to factor in also your intercooler setup i.e. reduce the amount of lag, also you should consider your manifold as a extractor style manifold will make it more efficeint espacially something with tuned length pipes.

Also what i noticed quite consideredably was modifying the injector pump injector pump, after i had done my roller setup and front it was good but not so torque off the mark i.e. just letting the clutch out (im running 4.1 and 35's). Once i had done the pump this improved dramatically down low power and same up high.

So what im trying to say keep an open mind and have a look at the current variables that your dealing with. There are number vehicles that drive really well with a single turbo, so i would suggest go for drive you if you know anyone in your area as you dont want to go around in circles spending a heap of cash and your vehicle is unreliable.

And as much as anyone can say i dont see many reliable twin turbo diesel setup as the last i heard of shot a rod through the block and another that was running a super charger and turbo was also quite in efficient.

weeman wrote:And as much as anyone can say i dont see many reliable twin turbo diesel setup as the last i heard of shot a rod through the block

Would that be the same engine that was running LPG, Nitrous and over 50psi on stock internals?

Reliability would be great if a turbo engine was used in my shorty, asking a n/a engine to put out 3 1/2 tiimes the power it should is only asking for troubles eventually, how ever it did put up with a lot of testing and trying to see what works and what doesn't. The 80 series did 2 years with not a hiccup. Its just the wife wanted her car back. The fab work is not much harder than making 2 parralells work.

If you want high power figures with no lag, sequential is the only way to go. Put an auto behind it it turns into an awesome ride.

Andy

Dzltec wrote:Reliability would be great if a turbo engine was used in my shorty, asking a n/a engine to put out 3 1/2 tiimes the power it should is only asking for troubles eventually, how ever it did put up with a lot of testing and trying to see what works and what doesn't. The 80 series did 2 years with not a hiccup. Its just the wife wanted her car back. The fab work is not much harder than making 2 parralells work.

If you want high power figures with no lag, sequential is the only way to go. Put an auto behind it it turns into an awesome ride.

Andy

Put your intercooler on and see what it can really do

Thanks muchly for your wisdom fellas, I think I will be calling on you Andy when back in Vic, but for now a question regarding rego and insurance when running the twin setup. What hurdles did you face with Transport as have just been on Patrol forum and saw thread on new lift regulations. Wonder whats next.Nice work Narnturbogq or should I say Macguyver, any update on your project.

maccapacca wrote:...but for now a question regarding rego and insurance when running the twin setup. What hurdles did you face with Transport...

What turbo?

coxy321 wrote:

maccapacca wrote:...but for now a question regarding rego and insurance when running the twin setup. What hurdles did you face with Transport...

What turbo?

That's factory officer

Thats not a turbo officer, its a round catalityc convertor with a plumb back system to improve emissions.