TB42 rebuild and turbo opinions

[Tiny]

I am looking to rebuild and turbo my TB42, the vehicle is a 91 mav lwb, I will be choping into an extra cab and it will be a full body off chassis rebuild.

While the body off the engine wil be oming out, the chassis painted and engine rebuilt.

The engine curently as a little over 320km on it and is running well, no smoke, good compression etc. The rebuild is to tidy everything up to run for another few hundered km and to strenghten the internals to suit running a turbo probably feeding something like 12psi, although if I can set up a variable boost set up I would be happy

My wish list as far as set up is-

GT28??
Pistons..what else should be done
falcon throttle body
megasquirt putor
top mount int if possible otherwise front mount
gas later on down the line

What I am after is suggestions on what should be done to the internals, what pistons to run and any other gear such as cams and why

What turbo would be the best to and and why

TD42 highmount cast manifold or custom and why and where

any help on running gas via the falcon throttle body or when throttle body would be better to run, does the gas research throttlebody allow for fuel or is it a stright gas set up?

Thanks

[hokey]

not much to ad but with a full rebuild go a bigger turbo than a t28. something with a T3 housing at least like a gt30.

are you able to get cast high mount manifolds? i thought all the cast manifolds for the TDs were low mount.

also might be good to clarify if you are going straight gas down the track or dual fuel?

calvin

[Tiny]

thanks, yeah running duel fual, other option I have found on researching is using the tb42e or tb45 manifold (inlet) set up to obtain a complete direct injection and sensor set up then using the mega squirt

also looking at wta int as well as I think it may be a lot neater and more efficient

[EnvyGQ]

I would not use a td42 manifold they can't handle the heat of a petrol and will warp and leak flat out???? If you want dual fuel you will have to have injection and use an autronic computer. also good turbo is a gt35 with a .86 exhaust housing.

[Dzltec]

We have sold both high and low mount cast manifolds. How hot do you think a petrol exhaust temp gets?
You could ceramic coat it for durability. I have my doubts against cast not being durable.



Andy

[chunderlicious]

the GT35 .86 exhaust is the best for the job. a petrol doesnt run THAT much hotter than a diesel, so if you dont take it off and on all the time it should be fine.

dual fuel will be hard with a turbo.. the timing will be way out for one or the other. id either go petrol and deal with the increased consumption or gas and the the $2G rebate.


high mount cast manifolds cost about $390 i think it is and ill find out who sells them.

[hokey]

dual fuel would probably work with lpg injection and a ecu controlling the whole thing. have two tune settings for each fuel

[Tiny]

We have sold both high and low mount cast manifolds. How hot do you think a petrol exhaust temp gets?
You could ceramic coat it for durability. I have my doubts against cast not being durable.



Andy

agreed, all the factory turbo set ups I have seen use a cast manifold so provided it is not running silly amounts of boost I am not sure there would be a problem, also provided the engine cooling system is up to scratch.

[Tiny]

dual fuel would probably work with lpg injection and a ecu controlling the whole thing. have two tune settings for each fuel

from the people I have spoken to this is the impresion I get also, as I said gas is own the line at this stage, the main focus is build the body and engine ready to run allowing fo gas as far as space under the try etc, but I dont see any reason why the megasquirt cant be set up with a dual setting to flick between gas and petrol

[hokey]

yeh probably just needs to make sure the megasquirt is capable enough. you going to build it yourself? mate of mine is still trying to get his rx7 running with one after 12months. was a steep learning curve for him.

I like your plans though

[Tiny]

yeh probably just needs to make sure the megasquirt is capable enough. you going to build it yourself? mate of mine is still trying to get his rx7 running with one after 12months. was a steep learning curve for him.

I like your plans though

thanks, it will be a steep learning curve on my end as well, but there is great tech on the forums and a mate has a megasquirt kit I can get cheap, the other option is to get one built, the price seems to be around the $500 mark for a built unit, although I would expect a little more with a twin set up