Twin turbo 427

deception05 · 09-12-2005, 03:00 AM

I am thinking of a twin rear mounted turbo set up. Has anyone thought of this with this type of set up? I know there are alot of ballers out there with cash to throw around. Can it be done or will the piping be too big for too much for the underside of by baby or could it work?

**Exotic Performance Plus** · 09-12-2005, 03:31 AM

The STS Corvette kits are set up this way. Bob

**peter@aps** · 09-12-2005, 10:27 PM

Originally Posted by deception05

I am thinking of a twin rear mounted turbo set up. Has anyone thought of this with this type of set up?

Turbochargers mounted closer to the exhaust ports would be the Ultimate solution for a twin turbo system. As the energy from the exhaust gases would be far more efficient being closer to the turbocharger and with this design you don't need to pump the charge air half way around the world before arriving at the intake manifold. That said, obviously it's possible to mount turbochargers at the rear of the car, just not the most efficient technical approach imho.

Peter

**Killer_bluebird** · 09-13-2005, 09:51 AM

I imagine it would be possible however this requires that you route 2 exhaust pipes all the way back and possibly 2 intake pipes to the front you probably could run a single intake pipe with a a y merge comming from the 2 turbos. The diameter choice for the pipe will be critical. I imagine unless you do a lot of custom work too, to your floorboards it is going to be hard to get good ground clearance and no banging pipes on your floor. I think the single turbo system is better if you are going the rear mount way because you have a y-pipe merging the exhaust from the 2 manifolds into a single pipe that is then routed to the turbo. I imagine the decrease in exhaust preasure from a 4 cylinders trying to push a turbo all the way on the back of the car will defeat the idea of decreasing lag by having the 2 turbos. My .02

deception05 · 09-13-2005, 07:52 PM

I was also thinking of getting rid of the Y pipe and going with true duals. I imagine I would have to do some custom work to the floor boards (

why didn't I think of that) But I have a friend that is running the STS and it seems to do very well that is why I was thinking of doing two of them with my 427

**peter@aps** · 09-13-2005, 08:10 PM

Originally Posted by Killer_bluebird

I think the single turbo system is better if you are going the rear mount.

Do you believe there is sufficient space to fit a large single turbocharger and still retain adequate clearance between the turbocharger, the car floor and road surface?

The other issue that really worries/concerns me with this rear mount approach is where to mount the air cleaner assembly? Surely not at the rear of the car where the air cleaner element is totally exposed to dust, water and road debris.

Thanks

Peter

deception05 · 09-25-2005, 04:30 AM

yes there is the STS that works out just fine it is just that I was wondering about running another pipe along side the one that already runs to the front with this kit I was just wondering if it was possible don't have my car (over 3000 miles away from her).

**BrandonDrecksage** · 09-27-2005, 02:57 PM

Originally Posted by deception05

yes there is the STS that works out just fine it is just that I was wondering about running another pipe along side the one that already runs to the front with this kit I was just wondering if it was possible don't have my car (over 3000 miles away from her).

a guy on ls1tech.com is selling a custom twin turbo rear mounts for 5 or 6 k i think.

kimchi_xtreme@yahoo.com · 09-29-2005, 06:37 PM

rear twin mounted turbo has already been done. Look up air power systems of Australia They have have a Holden( GTO ) that has a rear mount twin turbo. Very stealth from what I saw. This setup passes australias emissions. Not sure how strict their emissions are but if they are anything like California emissions then I dont see why their setup wouldn't work here in the us.

amilak · 09-29-2005, 07:10 PM

What's the benefit of mounting them in the rear? I feel like I'm missing some element of this idea.

kimchi_xtreme@yahoo.com · 09-29-2005, 07:46 PM

less clutter in engine bay area, easier to work on accesories, no real need for intercooler as the intake tubing will act as one and will not have the pressure drop that the intercoolers tend to have. It's nice to lift your hood and see a whole bunch of power adders but it's also nice to see looks on peoples faces when all they see is an apparently stock engine bay minus the intake tubing leading to bottom of car. There are two different benefits of a twin turbo setup. Two smaller turbochargers as compared to a single large turbocharger is little to no lag with same power output levels if not more at low end of rpm scale(bi turbo setup). The other is ability to achieve insane amount of boost level well in excess of what just one turbocharger can produce(sequential twin turbo-one small one big). in Sequential the small turbo will feed the larger turbo allowing the larger turbo ability ro build more boost that it would if it were by itself.

Sequential turbocharging or Sequential supercharging as it is technically known has been around for a long time. It is old desiel technology that still is being used not only on desiels but can be done with gas engines as well.