Single Turbo RX-7's Questions about all aspects of single turbo setups.

rear mount turbo

Old 02-25-10, 05:33 PM
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rear mount turbo

alright i saw this rx7 with a rear mount turbo on it and it seemed like a good idea for a track car which it was. it gets the heat of the turbo away from the already hot rotary and the car will not need as big a intercooler because the pipes will cool the air as they travel under the car. wondering if anyone else has seen this and if anyone here has it i was also wondering if it would be possible to run a small turbo next to engine then a big one in the rear of the car so the small one boosts up the big one. i know they do it on some race cars but they are usually small then big next to eachother. will it matter if they are seperated anyway just some ideas trying to do something different and maybe help that rotary stay cooler. it would be on a 95 fd heres some pics of the one my buddy built on his track fd he is a awsome fabricator if anyone needs work done around san diego he does buggies and all but he has worked on a few 7's anyway let me know what ideas you guys got

the site for pics http://asc-speedmetal.com/tag/magnus...eedmetal-rx-7/
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Old 02-25-10, 05:43 PM
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Ive seen a couple twin turbo vettes with this setup. Was thinking the same thing but for a different car.
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Old 02-25-10, 08:01 PM
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Your buddy does look like he does some fantastic fabrication work. On that website it looks like there is already a rear mounted turbo setup brewing...

It's a unique idea, boost threshold is lowered slightly due to the distance of the turbo from the exhaust ports, but not too drastic. I think it could be ideal for a twin turbo system. If your buddy is willing to help you out on the fabrication side of things I think it is an idea worth pursuing.
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Old 02-25-10, 10:17 PM
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there's a company called sts, stands for squire turbo systems i believe. they make a few diff setups for trucks and a vette. they had one for my tundra i looked into but i went trd s/c instead. quality setups, made a lot of power and weren't laggy in the least. their site is ful of info.
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Old 02-25-10, 10:23 PM
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yea i have know about sts for a long time i used to have a vett and was going to do it for that but got rid of it i have seen the twin setups too but they are usually same size i was thinking of a smal in the front and big in the back but not sure how that would work the nice part about the vetts is there room for the pipes over the rear wheel wells on the rx7 there isnt so thats another thing to build around
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Old 02-25-10, 10:59 PM
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but if you put a small turbo in the engine bay, you will still suffer the heat problems, you'll only be adding complexity and lag to your setup.
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Old 02-25-10, 11:26 PM
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question: how would oil be fed to and returned from the turbo if this were done on an Rx-7?
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Old 02-26-10, 01:22 AM
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The oil would be returned by using an electric scavenge pump and the feed should have enough oil pressure to feed the turbo without a pump. You can add one if you want depending on how far back the turbo is. A rear mount set up is not designed for high boost either.
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Old 02-26-10, 08:26 PM
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rear mount turbo

my rear mount, been 1 1/2yrs, no probs, i only run 10-12psi ,but its better than a vacuum in the intake manifold!
Attached Thumbnails rear mount turbo-82-isuzu-imark-diesel-coupe-5spd-004.jpg   rear mount turbo-isuzu-add-turbo-1.8-005.jpg   rear mount turbo-isuzu-add-turbo-1.8-004.jpg  
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Old 02-27-10, 11:04 AM
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yea getting oil there isnt a problem but i didnt know that they arent effective with high boost is it because of the length of the pipes going to the back doesnt allow for a lot of pressure or what and if that were the case two would help in making higher hp and boost am i correct
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Old 02-27-10, 04:08 PM
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With a air filter so close to the ground..thats regular maintenance, exposure to damage going over stuff and if it rains you gotta pull over.
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Old 02-27-10, 07:53 PM
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yea i was only talking as a race application not street use
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Old 02-28-10, 05:04 PM
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I reckon it has a lot of potential on a rotary tbh.

It takes some thought to get it right, thats why there is so many crap ones about which gives them a bad name, but as many many people have proven already, you can go rear mount with no disadvantages at all.

Fair few full on drag cars that have gone from front to rear mount for various reasons and still pull the exact same MPHs on the track and the owners say they drive just the same.

The one in the link should flow well with minimal backpressure, but the 3in pipe may be overkill, the V8 ones, even running 700bhp+, run 2.5in pipe on the whole.
Its all about keeping the heat in and the gas speed as high as possible without major restriction.

Its a shame its been almost a year since updates about the car in the link it seems...

Last edited by StavFC; 02-28-10 at 05:15 PM.
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Old 03-01-10, 02:03 PM
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yea i only saw the build of the car i havent heard from the guy as to how well he likes it so i still have to try to get a hold of him but i think i might do it something different a lot of people to do
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