That's right. One isn't better than another, they each have differing pluses and minuses.

Have you read our club Turbo article? It may answer some of your questions: Tech: Turbo

if ur using a 14-1500cc why dont u use the E15et ecu? considering u can get the dizzy to fit in a A series motor the computer will run the rest. u can use a loom from a ET pulsar. much cheaper and easyer to set this up than anything else. u could probly pikup a AFM, T/B, injectors, sensors, loom, efi pump and ecu for about $200 at ur local pikapart and theres pleanty of those cars going to the wreckers theese days

Hi everyone, 1st post.

I would say that suck through is easier to engineer and cheaper to set up. You just need the adapters etc to mount a carby in front of the turbo and the rest of the manifolds etc. It works but from personal experience (although it was a 51mm Weber onto a T04 feeding a blue 202) it was never quite right.
A blow through adds the costs of getting the carby built to withstand boost but with the benefit of being able to run an intercooler IMO makes it more attractive.

My setup only ever ran right on Avgas but McNally's soon twigged that I didn't really have an ultra-lite plane and got sick of me pretty quickly.

I've run both blowthrough and drawthrough on various engines, and the answer I normally give to 'which is best' is 'whichever one you can most easily adapt yourself'. Some people love sidedraught SU carbs (which happen to be very well suited to drawthrough) and find them easy to sort out. Other people curse their very name, but find running a holley with nitrophyll floats (which handle boost without collapsing) to be easy to sort for blowthrough. In the end it's really not that big of a deal, it's predominantly boost that is making the power, so it'll work well either way.

Thanks big time for picking up the typo - I definitely meant to type you 'can't' run an intercooler with a drawthrough. Believe it or not, some early Gale Banks kits actually run intercoolers (water to air ones at that) on their big block race boat turbo setups which were drawthrough carbed. not something I'd recommend.

Would you use a J pipe on both setups to power the turbine?

thanks for all the help, advise was really very helpful, after much consideration i have decided to use the draw through setup but wit an lpg throttle body, and setup and tune the motor to run gas only, many advantages like the fact that its already gas, its cold, its cheap and it runs really well upto about 10psi according to the experts at gas research, and as a bonus its cheap and they seem to think 120hp from a resonable stock motor is quite achievable.

and a bit more, yes i'll be fabbing my own inlet and exhaust manifolds and most other parts so i will post pics as i go.

just as an fyi - if you were interested - all impco lpg gear is made to be able to be run in a blowthrough right from the getgo, you just need to run a balance pipe from the convertor front plate to the mixer before the air valve. this gets pre mixer boost pressure to the convertor and ramps up it's output. They are generally ok up to around 10psi boost, some go up to 15, but you might find the convertor start to leak just a little on the outer plate/cover at those pressures.