turbo fed turbo

mustube

mustube

Well-known member
I was just wondering if anyone has ever heard of a small turbo feeding air to a large turbo and if so does it work and how much larger does the 2nd turbo need to be to work right. I am asking because i am curiouse if this would give big turbo boost with small turbo lag times.
 
really only works for BIG boost (tractor pull guys run about 100-120 psi last I heard. most turbos are good for maybe a pressure ratio of 3 max with two being the norm. they use each turbo basicly to double their boost. renenber turbos work on pressure ratio not boost really.
 
3rd gen RX-7 was extremely complicated, and a major hassle to tune if you modified anything. And the smaller turbo didn't feed the larger one, they both fed the motor just at different rpm ranges. Most guys I knew that had them pulled the twin turbos in favor of a single large turbo. I used to have a 2nd gen that I added a Paxton supercharger to. :D

pic00001b.jpg
 
btw a smaller turbo can't feed a larger....the larger feeds the smaller. the larger one will be moving a larger volume of air than the smaller one....the smaller one is jsut moving a denser charge.
 
i definitly think i might try this... maybe on a different engine first until i get the setup close, but its gunna have to wait a while while i get my body work done and get some more cash... im still wondering what size turbos might be good to do this with.. and this is on a 1966 mustang 200c.i.
 
The real question is ...... WHY?

If you have the right trans and rear end gears, lag is NOT an issue.

You can get a single turbo set-up to run just fine. With all the crap needed to run 2 turbos in two stages (like the RX-7 did) you are asking for horrendous problems.

And one feeding the other is just a plain stupid idea. It's only for huge boost numbers like what the diesel tractor pullers run. You can blow up a gasoline engine EASILY with the boost from one turbo.

One guy I know in Tucson, AZ spent $12,000 building a completely new turbo set-up with staged turbos and it went slower than it did when it had one single turbo.
 
this isnt a project to go fast this is a project to see if it is possible... and i would probably use alcohol because is is alot cooler when it vaporizes, and this isnt some 2 stage turbo set up, i just want to see what kind of boost numbers i can pull
nobody is going to but it doesnt hurt to ask... anybody want to donate parts
 
o and i would appriciate it if yall didnt complain about this or ask why... i would love it if i could get my questions answered.... thanks
 
mustube":2a658ssu said:
o and i would appriciate it if yall didnt complain about this or ask why... i would love it if i could get my questions answered.... thanks
Click to expand...

I think they are just trying to keep you from the headaches from trying to get everything running in unison and feel that one turbo is easily capable of producing enouhg boost to destroy your motor. The major things are going to be cost and time, instead of 1 turbo you now need 2, you have to find the room for 2 turbos, you have to size the turbos and route twice the number of lines to and from the turbos. If your looking for sometihng diffferent go for it. more power to you but these motors arent supras and dont hold much after 15 psi if properly tuned.

My ihi turbo off a ford probe will do 18psi on my motor definately capable of breaking stuff. It would take quite a bit of money to get it all together and tuned especially with alcohol, and if your looking for maximum boost youll need forged pistons, custom rods, crankwork, lots of headwork if your wanting to make power with all this boost or buy classic inlines new aluminum head thats supposed to be coming our relativly soon.

I dont want you to take that the wrong way but I'm another one for a single setup. 2 yes will be flashy and you can make a ton of boost but could you actually use it all? its kindof doubtful. But I dont want to discourage you from it, yea it would be effing sick if you got it together and going smoothly.
 
i was wondering which fuel delivery system would be best because that is where im probably going to start
 
i am leaning towards fuel injection, but i am not very knowledgeable on this subject, i someone would lead me to a source where i could read up on fuel injection that would be helpful.
 
mustube":zbz8jb4a said:
i am leaning towards fuel injection, but i am not very knowledgeable on this subject, i someone would lead me to a source where i could read up on fuel injection that would be helpful.
Click to expand...

I would strongly suggest looking at the Megasquirt systems.

http://www.megasquirt.info/
 
i was wondering if you could take an ECU from another car, with a different firing order and re-arrange the wiring so it will work with the 200... maybe an import v6?? or another popular car with a very controllable computer
 
well, I have a CFI set-up from a 3.8 liter V-6 (1984) and it could be adapted but it is NOT a "very controllable computer".

You might be able to make the OBD-II set-ups from '96-up 3.8 mustangs work (pretty darn controllable with SCT pro) but you are looking at twice as much getting it swapped. And you better be/know a good machinist.

If you want a "very controllable computer" you really need to look at aftermarket....Like megasquirt
 
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