Any Quick 2.3 card'ed draw thrus?

[Play400]

Was wondering if anyone had a quick 82 or earlier carb'ed turbo car. What kind of power you making? ET? What is involved? Have a spare motor from the Cobra just waiting to go fast.

[ZachW04Stang]

Check out this guy: http://vb.foureyedpride.com/showthread.php?t=62738

[Play400]

Is going blow thru the only way?

[Mad Max]

or efi

[myler]

I don't see how yo would draw through a carb with a turbo? someone enliten me. The only draw through systems i know of the carb sits on top of the roots style charger.

[Play400]

I don't see how yo would draw through a carb with a turbo? someone enliten me. The only draw through systems i know of the carb sits on top of the roots style charger.


Same way, the turbo is plumbed under the carb pulling the air thru the carb. Rest is PFM to me.

[mfpmax]

Blow thru is said to be "better" and "safer" than draw thru, however Volkswagon guys have been doing draw thru for years and still do to this day, however blow thru seems more logical way, but blow thru usually requires either a customized carb or a carb in a box to equalize the pressure.

[kckeener]

I got a draw through on my 79 capri. Please let me know if you find anything. I have been on and off mine for about a year. I rebuilt a turbo for it and put 2 1/2" exhaust with a header, cleaned up the engine bay and eliminated some of the emissions stuff. I need to find some mods for that carb or replace it with a holley maybe. I have no clue what to do with turbos, so I am learning as I go. Good luck with yours. Keep me posted, we could exchange some info!
Kerry

[lnchewitt]

It was a lot of years ago but the carb'd turbo I had really liked just a smidgen more boost with a bigger down tube. It sure was fun driving that bugger:) And I was so much younger then:)

[lnchewitt]

Would it be safe to say that if we did some research (spying:)) on some Volkswagon sites we might get some info for your draw through set ups? Might be worth the effort. Will check and see what I come up with.

[mfpmax]

Sure would be a good idea...nothing better than broadening your horizons. Be a good idea to hang out with a few of them if you found some local as well. Of course they don't use the same carbs as what we have, usually holley 2bls and weber carbs.

[Play400]

I thing I have learned is that the carb must have an solenoid controlled idle so that when you turn it off it will allow the throttle plates to close completely preventing the POS from dieseling.

A little of topic but...What controls / retards the timing in these old cars under boost? If you increase the boost will it start pinging? And what octane are you running? Ethanol ok?

[myler]

Same way, the turbo is plumbed under the carb pulling the air thru the carb. Rest is PFM to me.

I would like to see that I just can't picture it. Seems like since the turbo pulls air from one side of it the carb would have to be sitting right on the turbo.

[ZachW04Stang]

I would like to see that I just can't picture it. Seems like since the turbo pulls air from one side of it the carb would have to be sitting right on the turbo.

I saw it one time on a 60's chevelle at a local cruise in. The guy built a twin turbo kit and had the carb sitting on a Y pipe with a flange on the top to mount the carb. The pipe split off to the inlet of both turbo's.

[mfpmax]

http://i160.photobucket.com/albums/t180/eye-opener/MotorComplete-2.jpg

[myler]

Holy crap so all the air and fuel is going THROUGH the turbo?? That seems odd to me

[mfpmax]

Holy crap so all the air and fuel is going THROUGH the turbo?? That seems odd to me

Yes, and from what I read, that is a disaster waiting to happen...when it happens. Which it does from time to time it would seem. A backfire would explode the turbo.

[Play400]

Holy crap so all the air and fuel is going THROUGH the turbo?? That seems odd to me

Isn't that the same way a conventional blower works with the carbs on top? Just venturing into the land of turbos. Looking to do something with a spare 462 Pontiac I have and my 55 Pathfinder.

[Mad Max]

Isn't that the same way a conventional blower works with the carbs on top? Just venturing into the land of turbos. Looking to do something with a spare 462 Pontiac I have and my 55 Pathfinder.

Blowers have a much more controled boost/rotor or lobe rpm. Plus they have a blow off valve incase the engine back fires.

turbo boost is dependant on the size of compressor/turbine/exhaust/back pressure of theinduction system flow. That's why turbo size will make or break a combo. Supercharger boost is determind by back pressure of the induction system/compresor/engine rpm

[lnchewitt]

Most basic bolt on upgrades, electric fan, under drive pulleys. Now I know where I can get the fan, what about the pulleys, any aftermarket for the four bangar crowd?

[79TurboGhia]

You can blow more thru an orfice than you can draw thru, you can't run a BOV with a draw thru(flame thrower), you shouldn't run an intercooler with them either cause they will condense the gas back to a liquid.

Good points are they mix the air/fuel good, you don't need to modify the carb for pressure.

Your better off going blowthru, it's not that hard, you just have to play with the carb. They make great power, and are very streetable.

[NavySVO]

you shouldn't run an intercooler with them either cause they will condense the gas back to a liquid.
Pertol is never turned to anything from a liquid form. Fuel is potentially "atomized", but never changed into a fog/mist/gas from a liquid state.
If you look at an injector for instance, it is attempting to "atomize" the fuel. Is is only spraying it in a fine pattern (that is actually more efficient than a carb jet). Let's say that the car won't start now. Pull a plug and look into the cylinder and what do you see? Liquid. You will see that on a HOT engine as well.

One major disadvantage of the blow-through system is usuall when the engine is shutoff. Cold raw fuel is usually "deposited" into the turbo and causes numerous problems. Granted, it is in small amounts, but over time it takes it's toll.

[Schlodes]

Welp, we will find out this coming season I think. I recently ran an 11.81 @ 115 in my SVO and it snapped the axle clean on the driverside. The car is back together and fixed now, but It is going to be temporarily retired from dragging for a while, a year or two.

In the mean time I have my carbed turbo driveline still here from my 1980 Capri turbo. I am going to play with that, probably a home ported by me head, roller cam, port the intake, stock T3 rebuild, ranger header and 2 1/4" crossover and a methanol kit with the nozzle plumbed in under the carb injecting into the turbo [with the gas]. Prolly just use a 6 BTM. T5, and 3.73s or maybe even some 4.10 as now I won't have a 6250 limiter.

My goal is going to be, to run low 12s on the stock T3, unintercooled, and draw thru. Stay tuned :D

[83-88T-Bird Guy]

The Buick V-6 Regals had the draw thru system from 78-81. I had a 79 4 bbl Turbo Regal.

Boost came up slow but felt good while it lasted. never had a backfire tho, so i have no experience with that situation.