Simon, I think you either misread or misprinted because you CAN intercool a blow through system. You CANNOT intercool a draw through system. You do have an very valid point on the carb sealing though. If everything isn't sealed on a blow through, things could get ugly. The easiest (?) way to acomplish this is to box the whole carb up and the pressurize the box. Once I saw under the hood of a Maserati Bi-turbo, I was convinced.
Of course I would be the last one to argue against fuel injection as the best way to go. I am not familiar enough with LPG so it might be better, I don't know. Oops, have to go do some actual work now. The railroad needs me.

Guys, just a little info of carby turbos from Zoom Magazine if it helps.

Blw thru system - "The problems are numerous; one of the biggest is that the carburettor body itself needs to be sealed so that boost pressure doesn't cause pressurised air and fuel to vent directly into the engine bay (Bang!)." Someone I think mentioned sealing all around the carby?

Blow thru system - "...ultimate carby set-up that allow intercooling, more precise distribution and metering, they are harder to implement and rare in comparison to the number of suck-through systems."

What about cold weather? Poor starts, freezing fuel (I mean actually frozen) and accelerator pump setings to lessen the lag between pressing the throttle and getting the go.

For more info get Zoom No.40.

My mechanic wants to Turbo my Ford XB ute that runs a 4ltr OHC XR6 motor (straight six) but the only prob is he wants to use a suck thru using an SU carby. It will set me back $2k but I told him to shove it unless he was going with EFI. Not worth the bother I reckon.

Sorry, thats just my AUS 2 cents, choose what ever path you want. Good luck, if they still go hard I dont think there is much of a problem.

Simon

P.S. The Edited part is to say that you CANT intercool a suck thru system. Sorry if that confused anyone.



<small>[ Edited by mr_nismo4 on 2002/6/7 13:40:04 ]</small>

yeh, lpg is better for a turbs setup me thinks. As long as it's all setup right, gas is wicked. My friends Gay-lant (thats right, GAYlant) runs an LPG turbo setup with a starion motor. Oh yeh, i got pics too! will scan them soon, and post them. As well as a ton of datto pics that i took yesterday. You guys'll love it

some of the pics include that turbo 1000 i talked about, 2 other 1000's, and our 1000 convertible! And my friends 120y GX, haha. Yeh, we found this GX motor in a 120y? dunno how it got there...

Thanks heaps for all the info guys, it's been a great help. I am still gonna go with the drawthrough setup, but now i know what to watch out for.

Thanks

-Jesse

why not a throtle body of a early injected pulsar on the a series with a gas donut with the turbo blowing throu that ? no elcertic crap no bull shit just simple basic grunt and less chance of detonation from the high octain !! just an idea but i recon lpg is the go with a turbo

Heh. We all seem to be thinking alike. I already scored a Turbocharger off of an '87 Subaru Wagon. ;) I still need to top of the exhaust system tho. :) I'm still hunting for a fuel injection manifold for my A14. Wire that up with a home built megasquirt fuel injection computer, and it should be just a matter of dialing in the numbers. ;)

Jesse Jesse Jesse!
u want a good turbo? Go the T2 with CA18 internals. I seen it done before, the guy did a 13.7 @ 103mph, and its not a drag but a track setup. Although he did have injection and a custom cam plus E15(?Why?) pistons. As for the carb setup, just do what ever suits your budget. I know the other guys have a lot more experience than i do, but a friend of mine as u may already know had a T3 draw thru setup on his L20 and never ever had a problem, i think all u may have to do is research and see if there are any traps to fall in with this setup.

i thikn i will chime in wiht my .02 as well. i have to agree with dimlight on not using a drawthough setup. its just not worth it in my book. and it is a really simple procedure to make it a blow through setup that leaves lots more breathing room for future modifacations and additions to the system. i would look into a rhb25 IHI turbocharger possibly for use. it was equiped on the 87-88 ford thunderbird turbcoupe 2.3L motor. they were undersized for the 2.3 so they should be a nicely matched size turbo for the lower displacment A-series. another nice thing is that when ford chose these turbos they had quick spoolup in mind so it will have a nice midrange powerband. in factory trim these turbos produced 15PSI of boost on the 2.3 but started to overheat the air at a little over 18PSI. i try to find the flow chart fo you so you can figure out what you efficency(sp?) percentage will look like.

the REALLY nice thing about these turbos is you can gte them CHEAP. go to turbofords.org adn look in their forsale adds. a good IHI goes for about 75-120ish bucks their if your a member. they like to get rid of these turbos and step up to a fullt T3.

Really, the two main drawbacks on a draw through are the tortured air/fuel path when not under boost and the lack of intercooling. But since you don't want the intercooler anyway, gopher it! They do make power, other designs just have more potential. A good book for info on carbureted turbos is "Turbochargers" by Hugh MacInnes printed by HP books. It was written, or at least "updated," in the early '80s so some of it is a bit dated, but it does have tons of good info.
Note to AFRacer, funny you should mention the RHB5 turbo from a Subaru, I just bid on one on e-Bay yesterday. Just checked on it, I lost the auction, never mind. Junkyard, here I come!
I'm not going to take offense at the slam on Subaru drivers. I will say I drive the piss out of my '98 2.5GT Legacy though.

Thats the main reason i am using a draw through setup...no need for an intercooler, and it's cheap power.

I did not know about the downsides of a draw through setup, thanks for that.

Basically what your saying is that it will keep running rich/lean without any control over it? I spose thats the whole point of fuel injection, controlled fuel.

I'll hafta do some hardcore research on draw throughs....coz i dont want to kill my A14 early, it's just run in

-Jesse

Oh yeah, $800 for a rebuild on a turbo? Ouch! You guys probably know all the good cars to get a good turbo off of, but one that is always looked over that I got mine off of is from a Subaru. It's a IHI RHB5 from an 86 GL-10 Wagon. I don't know how much boost it's good for, but most of those cars are not thrashed on because they're Subaru drivers....come on! (no pun intended ) The nice thing about them is they all have the water inlet/outlet to help keep the bearings cooler, especially for people who just shut the car off right away after running hard letting the oil cook in there. All of the ones I have seen are still tight on the bearings, they're super easy to come by in a junk yard, and usually really cheap too, just make sure to get the exhaust pipe flange with it. It's kinda a big unit all together, but if you mount it like Subaru did with a long pipe from the manifold to the other side of the engine, there's plenty of room. Good luck to all the turbochargin freaks out there...hopefully I'll join ya soon!

-Andy