Outer Limits 4x4 Board

Im thinking of a real tight ass turbo project on a tb42 carby motor.

My thought is basically a suck-through set-up using the standard carby.

Using a TD42 turbo exhaust manifold OR modifying the stock manifold to accomodate the turbo. Then need an adapter to connect the carby to the intake of the turbo (on an elbow so carby sits upright).

Then just run piping to the intake manifold, which has an adapter allowing fitment of a 3" pipe.

Can it be done cheapely? I had a similar set-up on a 202 torana, and it worked quite well. Easily twice the stock HP, was running twin SU carbys.

Mike

Can't use stock carby unless you do blow through system for draw through you will need some form of side draught carby then you need to do something with timing etc go with straight gas less mucking around cheaper to run but still timing issues make sure you upgrade cooling system in short there are cheaper ways to do it as u mentioned but no cheap option will still cost around 2grand min I would reakon

you cant turbo the std carb without alot of fucking around. If you want cheap power an impco gas turbo setup is the way to go. Did mine n all up it cost bout 3k inc dyno time. My writeup isnt on here tho. But yes it can be done cheap

project_mq wrote:Can't use stock carby unless you do blow through system for draw through you will need some form of side draught carby then you need to do something with timing etc go with straight gas less mucking around cheaper to run but still timing issues make sure you upgrade cooling system in short there are cheaper ways to do it as u mentioned but no cheap option will still cost around 2grand min I would reakon

With the correct manifold, why cant a downdraught be used?

also, what are the timing issues?

As for the other stuff, it depends how much work you plan on doing yourself, and whether you are a true Terry Tightarse. I'm tight, but i try to spend money where its needed. For me it would be:

- Cast TD42/TB42 DTS low mount turbo manifold, can be had under $400, OR just make up a J-pipe for $25.
- Turbo (internally gated to save $$$), can be had for anywhere from $200.
- Dump pipe, $150 or DIY for $40.
- Intake piping for under $50 (second hand of course)
- Air filter, $30 pod at SuperCheap, or recycle a Patrol prefilter box.
- Lash out and get new plugs and leads, $120.
- Blow off valve, $from $30 off eBay (don't do this with blow-through though )

TSR might be interested in sponsoring this build if you shoot them an email.

mike_nofx wrote:

project_mq wrote:Can't use stock carby unless you do blow through system for draw through you will need some form of side draught carby then you need to do something with timing etc go with straight gas less mucking around cheaper to run but still timing issues make sure you upgrade cooling system in short there are cheaper ways to do it as u mentioned but no cheap option will still cost around 2grand min I would reakon

With the correct manifold, why cant a downdraught be used?

also, what are the timing issues?

Its not mounting that will stop you, the carb is a pos and on boost it will blow almost every seal! You have to case it and equalise its pressures inside and out if you know what i mean, there is a reason no one uses them. Dont try to re invent the wheel

cooki_monsta wrote:

mike_nofx wrote:

project_mq wrote:Can't use stock carby unless you do blow through system for draw through you will need some form of side draught carby then you need to do something with timing etc go with straight gas less mucking around cheaper to run but still timing issues make sure you upgrade cooling system in short there are cheaper ways to do it as u mentioned but no cheap option will still cost around 2grand min I would reakon

With the correct manifold, why cant a downdraught be used?

also, what are the timing issues?

Its not mounting that will stop you, the carb is a pos and on boost it will blow almost every seal! You have to case it and equalise its pressures inside and out if you know what i mean, there is a reason no one uses them. Dont try to re invent the wheel

Not if you set it up as a draw through, but i think mike was trying to explain that the extra piping needed to set a downdraft as a draw through could be avoided by just using a side draft in the first place.

I'm like mike, bit tight on cash and I also would like to turbo on a budget. I too am toying with the idea of a draw through set up. My only concern is whether the stock carb and gas system will flow the extra cfm. I am a little confident because of the way these engines drink fuel, it should cope with a conservative increase. If not a throttle body injection set up off an EA falcon might be the go.

Hi guys,

Here is the rule for any kind of performance toy....

Cheap, Power, Reliability - You choose any 2 you like.....

So you want power and you want it cheap - you WILL sacrifice reliability.

My advice - Stay away from the carby set ups.... either use injection or LPG gas. the hassle of the set up, no one wanting to tune, no one to offer advice... means you will re do things alot, which costs - you could have spent the money up front on a better system.

With the governemnt LPG rebate still current. Grab yourself a second hand system and find a licensed gas fitter who will sign it off for you.
I have done this twice now. you will find second hand gas systems for under $1000 for a gq. I fitted up the tank etc myself. They run the lines and wire it up. You get $2000 back off the government - so you can pay the guy a grand for his 1-2days work - and still come out even.

BUT now you have much lower running costs - And if using a GAS research carby - it is now suitable to turb without needing efi of a petrol carby....

From here the rest of your plan will work fine - cheap turbo and manifold....

Good luck with it
Cheers
Stew

you can turbo a tb42 cheap but you need to spend some money on upgrading the ignition unless you are only going to run a small amount of boost draw throw should work but you will have bad throtle respons

I am currently building a cheap carby turbo set-up atm.
So far I have fitted a 350 holley to my spare TB42 and am at the stage of fitting a carb hat to an Impco 225 mixer adaptor (going dual fuel on mine). Alot of members will say it is stupid, near impossible & a waste of time etc BUT I have worked with enough performance cars over the years (including blow through Holley rotaries & V8's) to know that it is extremely possible and achievable on a budget.

I am doing a TAFE course on TIG welding next semester, and will be doing my own pipework etc once I have purchased a welder & learnt a bit from the course. I have also fitted a pertronix ignition, MSD blaster 2 coil & looking at the MSD CDI & BTM system to control the timing under boost...

would like to hear how you go with dual fuel turbo setup!!

tuffmavman wrote:would like to hear how you go with dual fuel turbo setup!!

x2

cooki_monsta wrote:you cant turbo the std carb without alot of . around. If you want cheap power an impco gas turbo setup is the way to go. Did mine n all up it cost bout 3k inc dyno time. My writeup isnt on here tho. But yes it can be done cheap

x2

I was toying with the idea of turboing my rb30 carby a couple of years back, but in the end i converted it to straight lpg and that was the best thing i did! kept it like that for about 2 years and had not 1 drama, only recently i did a blow through Impco setup using just a single b2 converter and 225 mixer and a factory vl t3, turbo manifold and just braised up some oil and water feed lines, the whole conversion has probably costed me around $1800 so far and was so easy to do, highly recommend Turbo+LPG setups

Beast3805 wrote:

cooki_monsta wrote:you cant turbo the std carb without alot of . around. If you want cheap power an impco gas turbo setup is the way to go. Did mine n all up it cost bout 3k inc dyno time. My writeup isnt on here tho. But yes it can be done cheap

x2

I was toying with the idea of turboing my rb30 carby a couple of years back, but in the end i converted it to straight lpg and that was the best thing i did! kept it like that for about 2 years and had not 1 drama, only recently i did a blow through Impco setup using just a single b2 converter and 225 mixer and a factory vl t3, turbo manifold and just braised up some oil and water feed lines, the whole conversion has probably costed me around $1800 so far and was so easy to do, highly recommend Turbo+LPG setups

Have you had it dynoed yet?

The only downside to a straight gas set up IMO is range. With duel fuel, I can carry jerries of petrol to keep topped up when on a day trip or weekend away far from a servo. Can't do that with gas.

BadMav wrote:The only downside to a straight gas set up IMO is range. With duel fuel, I can carry jerries of petrol to keep topped up when on a day trip or weekend away far from a servo. Can't do that with gas.

That is the only reason I am sticking with dual fuel.
All my previous cars have been straight gas (which I prefer), but I plan on doing the Cape etc and 92L of gas won't last long and I can't put extra tanks in as I need all 7 seats...

We built a blow through system a year or two ago with a Holley 350. You do need an igniton to make it work.

Joel

coxy321 wrote:

Beast3805 wrote:

cooki_monsta wrote:you cant turbo the std carb without alot of . around. If you want cheap power an impco gas turbo setup is the way to go. Did mine n all up it cost bout 3k inc dyno time. My writeup isnt on here tho. But yes it can be done cheap

x2

I was toying with the idea of turboing my rb30 carby a couple of years back, but in the end i converted it to straight lpg and that was the best thing i did! kept it like that for about 2 years and had not 1 drama, only recently i did a blow through Impco setup using just a single b2 converter and 225 mixer and a factory vl t3, turbo manifold and just braised up some oil and water feed lines, the whole conversion has probably costed me around $1800 so far and was so easy to do, highly recommend Turbo+LPG setups

Have you had it dynoed yet?

Na m8 not yet, doing the clutch at the moment as it was slipping its ass off under full boost, but can tell you know running only 6psi is a big diffrence over N/a, should have done this mod ages ago so i wouldnt have to ring its neck all the time up hills.

GAS-747 wrote:

BadMav wrote:The only downside to a straight gas set up IMO is range. With duel fuel, I can carry jerries of petrol to keep topped up when on a day trip or weekend away far from a servo. Can't do that with gas.

That is the only reason I am sticking with dual fuel.
All my previous cars have been straight gas (which I prefer), but I plan on doing the Cape etc and 92L of gas won't last long and I can't put extra tanks in as I need all 7 seats...

What about fitting another tank up inside? we had like an older Navara come into work once, the thing had 3 110L gas-tanks under it! unbelievable hehe

GAS-747 wrote:

BadMav wrote:The only downside to a straight gas set up IMO is range. With duel fuel, I can carry jerries of petrol to keep topped up when on a day trip or weekend away far from a servo. Can't do that with gas.

That is the only reason I am sticking with dual fuel.
All my previous cars have been straight gas (which I prefer), but I plan on doing the Cape etc and 92L of gas won't last long and I can't put extra tanks in as I need all 7 seats...

And you wont find much gas up here anyway