Wow. Thats some stuff.

Hey, try it and see if it works. Maybe one day it will be perfected and no one will say anything.

Remember when people thought the world was flat?

Probaby just need a lot of engineering and design time.

 

any more news on this??

 

SICK!

 

any news on this????

 

That looks like the Lysholm QA2089 Supercharger? it should be good for 400hp on its own. I had one on my Miata with nitrous, boost was instant 10lbs by 2100rpm.

 

Yea what a mess

 

Heres a couple simplified opinions. Or thoughts out loud.

1. Your obviously going to need a standalone- MAF would only be seing a fraction of the volume of air.

2. Possibly integrating a RX7 or skyline type of fmic that has two inlets and one outlet. This might possibly even out the airflow seen at the manifold too. and causes less fabrication stress/cost

3 your going to want a crap ton of gauges. You will want to keep an eye on egts, Especially the rear mounted one. Boost readings from manifold and possibly each turbocharger. Boost leaks would murder this setup.

4. possibly alcohol/water injection to help combat some of the very high intake air temps your bound to see with this setup.

5. Boost controll is going to be weird. You probably wont be able to controll boost with the engine management system. possibly two controllers?? But the controller goes off standard vacuum pressure and bleeds air from there. ( bleed type controllers anyways) so once the larger turbo takes over the smaller one would shutdown and the wastegate would take over bleeding all of the smaller turbos exhaust out the wastegate. Which is a ton of volume for that size outlet. And for this reason obviously the wastegate would have to be re-routed into the exhaust. rear one wouldnt matter.

Owell thats my thoughts. Best of luck!!!!

 

I have to agree that the length of pipe to get to the front of the car from the rear mounted turbo would NOT be sufficint to remove the heat from the intake charge. Maybe you could have it ducted mount an intercooler under the car. Your idea of having two turbos is a great one, however, I think that you maybe should focus on setting up a sequential system like the one found in the supra. It consists of two EQUALLY sized turbos. One always opperates, and the other only is engaged after around 4k rpm. The 1st turbo provides 8.5 psi while under 4k and then when both turbos are spooled manifold pressure goes to 10.8 psi. Obviously you would want to run more boost on an evo than on a stock supra, but the concept remains the same. The supra has an exhaust bypass valve that allows the exhaust stream to be split amongst the turbos.

Low end use:


Prespooling the second turbo:


Both turbos boosting


EDIT: You might find this thread helpful. They replaced the stock turbos on a supra TT with gt28s http://www.supraforums.com/forum/sho...d.php?t=444569

 

MR2 was not twin charged

early models where either 4 cylinders or 6cyl supercharged
in 91-95 us models they dropped the six cyl and only went with a 2.2na or 2.0 turbo

 

Correct, there was never a twin charged MR2. The early models were offered with a supercharged 1.6 liter 4 cylinder, no 6 cylinder. The later models were offered in turbocharged 2.0 liter four cylinders.

 

I don't know if this has been touched on but you'd have to run a BIG EWG to bypass the 16g since you'd be restricted by the hot side of the 16g.

 

How much power did that evo make, the twin charge one, i really wanted to see AMS continue with their twin turbo build to see the outcome.

 

Sorry to bring that thread back from the dead just wondering if there was any updates......

Also has anyone seen the evo in the thread below (see post 16). Looks to be copmpound boosting using stock turbo and some turbonetics blower (guessing 66+mm). Very intresting....

http://images.google.co.uk/imgres?im...%3D40%26um%3D1

Cheers

Chris.

 

might as well subscribe. the idea itself is interesting, the results would be even more.

 

That last pic is Paul Volk's 2g DSM. Compound turbo with a 16g and 60-1. I'm running a similar setup on my talon with a 50 trim and a S475.

I considered the rear mount turbo concept at one point for a street car looking to go compound turbo without trying to stuff it under the hood. IMO, if you're going to run 2 turbos you might as well compound them and not have to deal with valving them in and out, etc. Only point that would require special consideration is the wastegate on the small turbo. You need a lot of it, and they all have to dump back into the main exhaust discharge. The long run from the back of the car to the front would actually be beneficial in a setup like this.