Rear Mounted Turbo System

suprahero

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There's a ford explorer and a couple chevrolet trucks here locally that have those. The guy in the Explorer and one of the Silverado's are both dealers. The explorer runs a 8.2 in the 1/8 mile. He can outrun most of the cobras and all of the gt's.
 

Supracentral

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Mar 30, 2005
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I've dynoed a couple of these on F-body cars (Camaro/Trans Am) and a few pickup trucks.

You'll notice that the vast majority of these setups are run on high compression, large displacement engines. While there is "lag", it's not as bad as you think since you've already got a capable engine, large volumes of exhaust gas to work with, etc.

Most of them use the turbo to completely replace the muffler. You hear a lot of compressor chop, it's a pretty wicked sound.

There's no intercoooler on most of these setups as well. Since the turbo is so far from the engine, the heat is a lot lower than our setups. The long pipes also act as an intercooler to some extent.

These are low boost applications for the most part. There are some disadvantages, long oil lines, scavenge pumps to return the oil.

It's a kludge, but it works, and it's pretty cheap.
 

suprahero

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I learned a new word today...........wooot!

Kludge:–noun Computer Slang. a software or hardware configuration that, while inelegant, inefficient, clumsy, or patched together, succeeds in solving a specific problem or performing a particular task.


My brother has looked into these for his C5 vette. I'll have to buy a larger turbo if he does install one.
 

HommerSimpson

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Dec 31, 2007
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saw last weekend on that show on speed ... brain fart ... that dude that does trucks and bar stool racers...

Anyway him and tony stewart and Armoral ...he was building vett to give away... did the rear turbo thing to it...
did not look like fun putting on... but did look neat as all get out..
 

Quin

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Dec 5, 2006
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I've never even heard of this on anything other than f-bodies and the new GTOs, but it's the only way to go for those guys apparently. I've only seen two front mount turbo cars and they were both drag only.
 

Supracentral

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Quin;1076092 said:
I've never even heard of this on anything other than f-bodies and the new GTOs, but it's the only way to go for those guys apparently. I've only seen two front mount turbo cars and they were both drag only.

It's not the only way. You can mount turbos down low by the bellhousing. There's a enough room for a front mount up in the nose. I've built one.

But it's a hellacious amount of work, and there's little space. It's tight, difficult and expensive.
 

Quin

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Where did you put the IC? Move the radiator back a good bit? Both of the front mount Firebirds I saw had the turbo sitting right in front of the intake manifold (if that makes sense, if not I'll try and find a picture), no idea what they did about an IC.

I know STS and a few other companies sell bolt up rear mount set ups for fairly reasonable prices, which require little modification. I think that's the reason for the popularity of them.
 

Supracentral

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Quin;1076108 said:
Where did you put the IC? Move the radiator back a good bit?

It's a bitch. If you look in the nose of a T/A you'll notice the rad is actually at an angle and not straight up and down. The IC laid in front of it, I used a LARGE, but relatively thin core. It was pain in the ass. I'd never want to do it again.

Quin;1076108 said:
Both of the front mount Firebirds I saw had the turbo sitting right in front of the intake manifold (if that makes sense, if not I'll try and find a picture), no idea what they did about an IC.

I've seen those, although most of them were centrifugal superchargers (think belt driven turbo).

Quin;1076108 said:
I know STS and a few other companies sell bolt up rear mount set ups for fairly reasonable prices, which require little modification. I think that's the reason for the popularity of them.

Yea, they are cheap, any idiot can install them, and they work. It's a good alternative to nitrous on those cars. However I'll tell you, they respond very well to NOS.

Here's my sheet:

dyno041602.jpg


That's stock fuel, no tuning, a catback, a K&N filter and a dry shot triggered on a MSD window switch and a WOT switch.

Dirt cheap way to get power out of these cars, and they last with it too.
 

Jervis Mcstabby

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Supracentral;1076055 said:
These are low boost applications for the most part.

That's really the main reason it interest me, as it seem that going above 12Psi in an NA-T setup is bad.

Been staring at the bottom of the car for a while, looks like banging out the tire well would give enough space for this setup
 

Quin

Trans killer
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Yep, I knew the radiators were at an angle, that's why I asked :biglaugh: Now that you mention it, I think one of them might have been a centri supercharger. I know for sure one was a 106MM turbo though, I've still got the videos. I planned (and still do, actually) on getting an LT1 Trans Am... I think Pontiac really hit the nail on the head with that car, the curves are amazing. Interior lacks a little, I like the same generation Camaro's better, but it's livable. Full bolt-ons and a decent cam of course, but rather than boost it or get some really nice heads for it, just healthy shot (150-200).

Judging by those mods, 150 shot? Car looks sharp.
 

Supracentral

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Poodles;1076363 said:
get an LS1, you'll be happy you did...


optispark = HELL

QFT. The LS-1 is a pretty bulletproof build. Especially after you upgrade the pushrods.

And optispark is the tool of satan...
 

Quin

Trans killer
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They fixed the Optispark problem in 96+ units. I dislike the sound of LS1s, dunno why. I think they sound like someone is trying to blend a CD or something. Most of the cammed ones I've heard (at least, the ones with a cam of decent duration and not just a teensy bit bigger than stock) sound like garbage... LT1s sound like pure sex!


Also, they are a lot cheaper to buy and build... Could just buy a V6 and put a 2JZ in it :rofl:
 
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