TB42 Turbo Project

[zak308]

Hi all,

At the moment I am in the planning stages for the next stage of improvement for the old trol. As the title states, I am looking at turboing the ol' 42 to give her a bit more gusto. But I am going a little further than that and that is where I am running into the area of needing ideas/advice/guidance.

The idea I'm having is taking the old TB42S running dual fuel and running 100% gas and turbo. My plan so far involves getting rid of all of the petrol gear including tank, lines, pump, carby and manifold. I have an idea to run a TD42 alternator with a vacuum pump to solve that issue, as well as using a TB42E intake manifold and throttle body.

The questions I have for all of you people, full of wisdom, are:-
-What sort of boost could I safely run on stock internals?
-Would I be able to keep my gas mixer and adapt it onto the throttle body?
-Would I be better off using a single injector for the gas?
-If I were to use a single gas injector in the manifold, would I have to change my converter?
-Is the TD42 alternator with vacuum pump the best option to handle my vacuum needs?

Also, if anybody has done anything similar to this, I would really love to hear any problems you ran into while doing this and would also really like to see any photos of any of the things I'm looking at doing.

Most of the work will be getting done by me, just gotta get the bike up and running so the patrol can be off the road for a couple of months while I get everything done.

Thank you in advance :)

Zak

[gooch]

Wouldnt mind doing the same to my swb

[billyj]

about 12psi is the limit of stock internals, you dont need a td42 alt as the engine doesnt see any boost when the throttle is closed so brakes still work fine.

[zak308]

I was more worried about the clutch booster getting vacuum.

[Robo]

You could always install a reserve vac cylinder if your truly worried.

[zak308]

Yeah, I never really thought about that. Does anyone also know what sort of aftermarket parts are available for the tb42? Because I was hoping to build it up to be able to run 18-20 psi daily.

[billyj]

havent noticed my clutch being any harder since i turbo'd my tb42e but that said im only running 4-5psi so far

[zak308]

Yeah, I'm hoping to be pushing about 18-20 psi in the hope of reaching at least 250kw at the wheels.

[billyj]

if your after that sort of power drop in an ls1 and turbo that, would probly be cheaper and more reliable, any tb42 making that power will be very stressed

[zak308]

I really don't want to go v8. I've had an ls1 commodore before and the fuel consumption and rego costs are too high for me. Plus I would like to keep the tb42 so I don't really have to worry too much about a mod plate and all of that. I know I'll need a plate in the future, but it won't be as obvious if I get pulled over.

[gooch]

If ur chasing power and keeping to the six cylinder nissan engine. Why not go the Rb25det can usually handle 400hp at the wheels on stock internals and cheap to buy round 1500 with loom. Im considering it for my shorty.

[zak308]

I just really like the torque of the 4.2 plus I'm trying to do something a little out of the ordinary. And with keeping the tb42, I can do a lot of the work myself as it's only really a full rebuild and new manifolds and stuff.

[Drewboyaus]

If ur chasing power and keeping to the six cylinder nissan engine. Why not go the Rb25det can usually handle 400hp at the wheels on stock internals and cheap to buy round 1500 with loom. Im considering it for my shorty.

The engine characteristics of that donk don't suit low range 4wding especially well. Shedloads of power but way higher up the rev range than a turbo'd TB.

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[gooch]

This is tru, if ur car is geared correctly it doesn't seem to be an issue. Theres plenty of options. Ive been weighing them up as im in the same boat.

[Ben-e-boy]

This is tru, if ur car is geared correctly it doesn't seem to be an issue. Theres plenty of options. Ive been weighing them up as im in the same boat.

What would be the correct gearing? That motor makes peak torque at 4400rpm, gear it too high and a peaky motor likethat would be a pig for throttle control

[Parksy]

What kind of boost would a TB with forged internals take? According to the internet, forged rods and pistons are readily available for this engine.

[nissannewby]

What kind of boost would a TB with forged internals take? According to the internet, forged rods and pistons are readily available for this engine.

Yeah uprated internals are certainly available and with forged items you could run up to 20 psi I would imagine. I knew of one of these making 350hp at the treads and 100hp shot of nos so it had 450hp on hand if you buried it to the floor as this is where the switch was for the nos.

[Drewboyaus]

Yeah uprated internals are certainly available and with forged items you could run up to 20 psi I would imagine. I knew of one of these making 350hp at the treads and 100hp shot of nos so it had 450hp on hand if you buried it to the floor as this is where the switch was for the nos.

Bloody hell! You wouldn't be driving that up a steep hill, you'd be launching into space! That is crazy power.....

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[cmbfin]

Hi there, I'm currently building a TB42 with forged internals, balanced, headwork etc etc, with a view to turbo as well. I have probably gone massive overkill but I've been told that it will basically last forever if correctly looked after. Head's been ported, Forged Pistons, Fully balanced. Originally I told the engine builder it would run 12-15 Psi all day (Intercooled), It's en EFI TB42 which will have a custom computer and wiring as it's going into a currently carby'd dual fuel Maverick. Not sure what power to expect from this setup? Also should it run higher Psi? I'm after low down torque, a lot more power obviously but the key word was longevity.