how do you control the amount of boost you want to run with a draw thru setup??

 

a draw-thru setup shouldnt be considered do to the fact you will have small droplets of fuel striking the compressor wheel and 100k RPMS sorta like sandpaper... but you would control it with a wastegate of sometype

so if you want it to last and not be rebuilding turbos all the time go blow thru probably easier in the end

 

well also wondering, how you would measure boost, like how you'd hook up a boost gauge

 

drill a hole, and weld a fitting to the piping after the turbo and put in your sending unit thats usually included with your guage..

 

but there will be fuel and air running through, or doesn't it matter??

 

Well, nothing runs "through" a gauge. It just measures the pressure. It won't matter if there's fuel and air.

But draw through turbo is a terrible idea. I'd highly HIGHLY recommend you re-think this, and see if there's a way you can move things around and make it blow through.

 

plan on doing a blow thru in the future i just wanted to try out the draw thru method just for hell of it, i thought it could make a pretty neat little project

 

the fuel will ruin the turbos impeller, and its the same amount of work to blow threw.

 

http://www.nastyz28.com/forum/showth...ghlight=martin

http://www.nastyz28.com/forum/showth...ghlight=martin

 

that looks pretty nice, and for only 800 bucks? i wonder what cost comparisons are to a blow thru setup running the same amount of boost

 

suck through design turbo setups suck ***. any amount of boost that is made then the throttle blade is suddenly shut... not good on turbo.... just back spins it. blow through is WAYYYY better. and intercooled boost is better than hot air blowing in the intake. just heat soaks the intake and is not good on the engine.

 

that martin system uses a bypass valve...

 

so what, does that then just dump the fuel and air back before the turbo once it's reached a certain pressure?

 

it could do that which would still destroy turbos or it vents the highly flamable gas to atmosphere

 

lol didn't read that! kinda like a roots blower

 

SpitotRs305, blue82_z28... do some research so you know what your talking about

 

Uhhh, you should check that.

The ONLY advantage of a suck through is that a BOV is not required.

Well that and there is virturally 0% chance the turbo will back spin, except for a an intake back fire.

Think about it. The turbo will be ran in the system closer that of a diesel engine. The only thing between the turbo and the intake valve is the piping and intake manifold, with nothing to close and create an excesive amount of presure, or intake reversion. The closing of the throttle blades on a draw through set-up will only cut off the available air to the engine and the turbo will spool down on a more natural time curve than one that has a throttle blades that shuts and causes the intake reversion/excess presure, between the throttle plate and compressor.

The mahor disadvanteages are that a drwa through set-up can not or rather should not be used with an intercooler, due to excessivly long pipes, where the fuel will puddle, and also sometimes causes just plain running issues.

If you were to use a port injected EFI set-up and placed the throttle before the compressor it wouldn't be so bad, because there would be no fuel running through the turbo, and there would be no fuel puddling issues, so you may actully be able to use an IC with a set-up like that. I had thought about trying a system like that, but haven't had time yet to test it.

 

okay sleepy perhaps you being all knowing could explain why running a turbo like that is better...

what happens when the throttle blades close and the turbo is still spooled?

why is it all of a sudden ok to have fuel running throught the compressor?

OHHH and the big one... WHY ARENT THEY STILL MAKING THESE KITS IF THEY ARE SO GREAT?
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oh and with a diesel engine.. you cant really have to much boost... they wont detonate... the more boost the better they run cleaner and stronger that way... the only thing that limits diesels is fuel delivery and mechanical means of holding the head on...

not so with a gasoline engine

 

I don't think anyone thus far has said that a draw through set-up is any better than a blow through, in fact I think everyone has said the opposite.

I also believe everyone has also said that it's bad to have the fuel going through the compressor.

 

i would think that fuel going through the compressor is a bad thing. all that boost created. where does it go? i dont think that it will just calm down. unless the engine will just use it. don't know i guess i have to look into it more. IMO i think that draw through setup is way crappier design than the blow through design.

 

But that's the thing, the turbo needs an air supply to create boost, when you cut off that supply (in a draw through), then there is no more boost created, in fact everything post throttle plate(s) becomes vacuum. That vacuum can become another problem with compressor seals, where it could actually pull oil through, due to the engine vacuum, if it gets to be high enough.

 

which is why you'd use carbon seals right?

 

well i never thought they would be better just the way sleep is toting that kit around you think HP god handed it down himself....

 

This tells why this system isn't made anymore...if there's any truth to it.

http://www.geocities.com/microjet_2000/FAS/turbo1.html

I never said a D.T. system was better.

 

so because of the vacuum you would need the carbon seals to prevent oil from being pulled out of the turbo??

 

It's been done with good results in the past on a 60* V6...
Draw through turbo (click here)
Shaved a couple of seconds off the timeslip with a slipping clutch!