turbo: blow thru vs. draw thru

Sweet5ltr said
A blow through setup is simplistic already, why go through the hassle of turbocharging anything with an ancient 'draw through' design? It is nostalgic to say the least, but I think anyone in modern times will be disappointed with the results. Sure, we understand it is 'easier' in a sense but do you gain enough performance to justify working and 'tinkering' with something twenty to thirty years old. We still haven't factored in, you will need adequate 'high pressure' fuel system components, MSD BTM, A/F wideband setup, and all the necessities that a typical turbo build will require. Boost is boost, but with all the budget systems and widespread information today on doing it properly; I just scratch my head at these systems and their place any relatively performance oriented Mopar. Good luck regardless on your turbo mopars everyone!

I chose to do this due to the simplicity of the system. Yea todays tech is great but a simple twin turbo draw thru set up is just as good as todays new tech. IN FACT most of the "new tech" is based off of 1950's and 60's performance that was too expensive back then to mass produce. Fat shaft turbos? roller bearings? Hugh MacInnes designed that back in the 50's on the Rajays. In fact, Turbonitics bought his patents out in order to STOP their production as they could last three times longer than any other turbo. If any of you where to get one of the books he wrote on turbocharging from the 70's, I bet a lot more people would do draw thru's. Its a lost art now, but every air craft during WWII had draw thru centrifugal superchargers "turbos in todays terms". I have one of the Gale Banks TT setups on a project trike. Gale made 1400 hp on a stock block, small block Chevy and set a LSR for a stock body car with these same draw thru turbos.

A draw thru turbo mixes the air fuel better and will require a smaller jetting

draw thru's super cool the air fuel mixture so cold it will freeze the intake track, that's why an intercooler is not needed, in fact, you have to ADD heat via a cross over intake with heat risers in the heads, or coolant thru the turbo intake.

draw thru's reduce the vacuum under the carb so well that a SMALLER CARB is used. AKA a stock 350 would use a 750 cfm carb as a factory performance engine, the same engine with a draw thru would need a 650 cfm and make twice the power.

I have several of the books from Huge MacInnes on these set ups and I can hardly wait to get it running. Took me 6 months to find all the correct parts to put it together correctly. A 40 year old aluminum Holley with none of the threads stripped out is near impossible to locate today.