Is anybody here running a pull through turbo setup on here or is it all push through on this forum? I was just wondering...My turbo Cressida project is going to be pull through.


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'96 Cavalier Good ol' Pushrod 2.2
-24X,000 miles on factory build
-Some oil loss between changes, me thinks it be rings.

any particular reason you want to do that type of setup? be sure you use a turbo thats setup for that. they use a different compressor seal!!! I am not aware of anyone using that setup on a j body but there is no tellin



99 Turbo Sunfire GT | Ram 2500 | International Rollback | Mr Hanky the Suburban

the only real problem i could see with that setup is going to be the delay when closing the throttle... could cause some driveability issues.... p.s. i have never seen a setup with the tb before the turbo..... not sure if it would even run correctly.

The Old Chrysler turbo were setup like that. Just like a supercharger.



Gilles
2.3 Ho

Well I want the car standard but I hate the loss of spool because of letting off the gas for the shift. A pull through system works best at keeping spool between shifts because the compressor just spins in a vacuum. On a push through setup the compressor has to work against the throttle body and is why you need a blow off valve to relieve the pressure spike the compressor and the other intake components before the TB and after the turbo receive and that wastes your boost. Also under slight load the turbo can spool higher more freely and start making boost at a lower RPM if the car is already moving. That really only plays a part when the turbo is a little large for the engine but that's what I'm using for 21psi.

As for the throttle response...I'm working on getting the tubing for the IC as short as possible. So far my tubular intake manifold is perfect because instead of having to go over the engine like the old one did I can have it just run straight out the front and in from the IC. It cuts about 4-5 feet off the tubing needed

I'm using a megasquirt system to manage the EFI so I can rid the engine of that dreadful air flow meter.

I'll show the supra punks that a 5M really can beat a 1jz in a race...


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'96 Cavalier Good ol' Pushrod 2.2
-24X,000 miles on factory build
-Some oil loss between changes, me thinks it be rings.

you definitely have a fun project there but i think the draw thru setup is going to leave you unhappy. one thing to consider: if a charge pipe fails you have a WOT situation. also, the charge pipes will have to handle vacuum. so they either hafta all be hardpipes or be heavily reinforced or they will collapse and fail. if you have a properly sized turbo for the power level you want you wont have any noticeable lag issues at launch or between shifts. its all about a balance of turbine size matching your driving style and compressor matching your engines power. if you have a large turbo with quick spool you had better have an external wastegate to prevent boost creep.



99 Turbo Sunfire GT | Ram 2500 | International Rollback | Mr Hanky the Suburban

one note: when i say large turbo with quick spool i am speaking of a turbo with a small turbine thatl spool up fast with a large compressor thatl move alotta air. generally speaking this can cause alotta part throttle surge and fall off on the top end in some cases but its damn fun on a street driven car



99 Turbo Sunfire GT | Ram 2500 | International Rollback | Mr Hanky the Suburban

^ talk about it. My turbo on the Gtz was making full boost at 1700rpm. Hard on the tire tough. I could never get out of boost.


Gilles
2.3 Ho

i bet that sucked on the highway!!!



99 Turbo Sunfire GT | Ram 2500 | International Rollback | Mr Hanky the Suburban

Didn't make it that far My Haltech didn't worked when in boost and I lean out so the rings gave up.

Fun thing to drive when you're in town and all you can hear is the BOV and turbo all the time.



Gilles
2.3 Ho

That's pretty crazy...I bet that was hard on the tires.


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'96 Cavalier Good ol' Pushrod 2.2
-24X,000 miles on factory build
-Some oil loss between changes, me thinks it be rings.

i have a t3t4 with a .48 turbine, the cars an auto so it goes under part throttle boost all the damn time. its fun to drive like that but the bov is annoying as hell and i really hafta watch the boost / vac on the highway to keep it in vac so i can get reasonable mileage. i generaly get upper 30's when i stay below 70 but if i go 75 + it drops like a rock cuz its spoolin the piss outta the turbo and hittin 1500 - 1600 egt's (bad) I havent hurt the motor yet but its comming im sure. with 150 + on the motor and 250+ on the trans / car i cant complain.



99 Turbo Sunfire GT | Ram 2500 | International Rollback | Mr Hanky the Suburban

Why don't you put in a manual bypass for the wastegate? Sounds like your eninge wants to be a diesel. They usually are right on the edge of boost on the freeway and once you press a little bit to pass or accelerate a bit you hear that bitch spool badass.


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'96 Cavalier Good ol' Pushrod 2.2
-24X,000 miles on factory build
-Some oil loss between changes, me thinks it be rings.

Also would like to mention that if you had a pull through system you wouldn't have those problems on the freeway


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'96 Cavalier Good ol' Pushrod 2.2
-24X,000 miles on factory build
-Some oil loss between changes, me thinks it be rings.

Roscoe and Gilles... interesting... my turbo is like that too on the highway - hell I get 9 psi in cruise control... but I have a very large turbo as compared to most.

Odd. I do have to say - it's annoying that 5% throttle on the freeway = 4-5 psi right away - especially when you're trying to get some gas mileage.

-Chris-



-Sweetness-
-Turbocharged-
Slowly but surely may some day win this race...