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Not sure what the point would be. Wouldn't the exhaust gases be moving faster right after the manifold, since the pipes are usually smaller than at the tailpipe? IIRC, between a smaller cross-sectional area and a larger cross-sectional area, the same volume of gas will move faster in the smaller area. Therefore, why would you want the turbo back there. There would be much more turbo lag, and the air would have to go so much farther to get to the intake, invariably having to go through dozens of angles and bends. This will also slow that air down. Further, what happens when you go through a puddle and end up like Sarah, with a $3K turbo and an intake manifold full of water?

Not saying it's the worst idea in the world, I just think that the amount of work and material that has to go into it is totally overkill...not to mention that if they're plumbing the compressed air (post turbo) through the trans tunnel, it's going to get hot from the surrounding pipes and mechanisms (rear end, trans, etc.). Also, if they have an intercooler up front, the change in temp is going to further slow the air down. When the temp drops, the pressure will drop (as will boost), because of 1- the loss in energy due to heat and 2- the fact that cool gases take up less space than hot gases. Didn't these people think of all this?

I don't know...what does everyone else think?

JR
 

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Discussion Starter #4
Personal I would not rec'd this type of system to anybody, but I just thought it was stupidly interesting. With all that turbo lag, something like this would be less stressful on our crappy transmissions. And I would have the air intake in a different place.
 

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Discussion Starter #5
Originally posted by godspunk32@Aug 8 2004, 10:23 PM
And I may sound stupid, but what's the point of the methanol injection system?

JR
:headscratch: Don't Know?
 

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Originally posted by SHOoff+Aug 8 2004, 10:43 PM--><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (SHOoff @ Aug 8 2004, 10:43 PM)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-godspunk32@Aug 8 2004, 10:23 PM
And I may sound stupid, but what's the point of the methanol injection system?

JR
:headscratch: Don't Know? [/b][/quote]
Metnanol injection lowers the intake charge temperature to reduce detonation. His car is most likely non intercooled.

As wierd as the setup may look and as far from ideal it is, at actually does work. I used to have a video of a camaro running that exact same setup. I can't find it now, but it actually built boost faster than I thought it would, the setup makes up for not being ideal because the exhaust gasses from all 8 cylinders have to pass through that one small turbo.

Now I don't know how good it would work on a 4 banger, or even a small 6. There was a honda with a setup identical to that on ebay a month or 2 ago. I doubt that setup would work even close to as good as it does on a v8. We all know how tiny honda motors are.
 

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I never doubted the fact that it would work, I was looking more at the fact that for the amount of fabrication, elbows, bends, and installation, as well as the cost, which is well over $3K for a small turbo, it's not worth it. Now I understand what the methanol does, but does it really reduce the temp enough to warrant not having an intercooler?

JR
 

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In some cases where you cannot mount an intercooler with the turbo, water/methanol injection is the only other option that you have to lower intake temps - such as this case where the turbo is mounted too far back and low to have a front mount, or any kind of effective air cooling. Its either that or nothing at all. Injection works pretty well actually; water/methanol mix has better thermodynamic properties than air. Just need to refill the tank at set intervals.

Best option is to have both actually; STi's and the previous Cosworth Escorts come with automatic water injection (with manual override) stock. The nozzle is mounted right before the TB, further reducing intake temps after the intercooler.
 

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Yeah, the system works okay. It's not ideal, but it works. I saw a vid of the LS1 with rear turbo run like 11.88, and that's with stock heads, cam, etc. They wanted to conserve what little room under the hood that they had stock, that's why they mounted it so far back.
 

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oh oh my first real contribution to this forum

rear turbo

read through the FAQ and they will explain and answer almost all of your questions

I emailed him about a setup for my sho and here is what I got. i'm not going to explain much now. *points to the link*

Alex, we do have a generic system that has all of the key components of
our production kits but require fabricating the piping to the manifold.
That system is $3125. Let me know if I can help. Thanks Dave

STS .... Performance Made Easy!

David South
STS Power Dealer Program
V.P. Channel Sales
www.ststurbo.com
[email protected]
801-722-8237

and the next day

Yea that is all of the stuff. The oiling system is one of the key
components and also the wiring harness and all of the flanges for the
turbo and waste gate so that you can weld pipe to the flange and then
just bolt it on. We also include several U-bend pipes and silicone
hose
and clamps.

STS .... Performance Made Easy!

David South
STS Power Dealer Program
V.P. Channel Sales
www.ststurbo.com
[email protected]
801-722-8237

for FAQ click me
 

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That thing has to be really ineficient. you have to run an intake tube from the rear of the car all the way back to the engine. That's 10+ feet of intake tubing that has to be pressurized. that's ALOT of friction loss. And the intake and exhaust are only a few feet from each other, which probably isn't an issue when the car is moving, but idling in traffic it's a different ballgame.


For $3125, I would either put in a SC, or TT up front.

Just MHO
 

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But boost for that amount of money better be significant, and with this, I can't see the boost being very efficient or significant. I understand that they want to save space, but the drawbacks are too great for that system.

JR
 

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I agree mostly with whats been said. I wonder how much it cost to do all that? It seems like it would be more since more plumbing has to be done. That seems like a terrible place for the intake too. That turbo isn't going to be producing the boost it's capable of either due to the distance it is from the manifold and the frictional and minor losses in the plumbing. If I were going to throw down that type of money, I'd put the turbo up in the engine bay, especially on a camaro.
 

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Also, if you look at the picture I've attached, there is an exhaust pipe that attaches to the turbo that becomes very restrictive when it makes the turn onto the turbo. It's circled in red below.

JR
 

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yeah that does look like a poor choice of routing in that case.

i'm just saying I think it is a good idea, and I know it produces good results, at least from what people have said on forums. they are organizing a group buy on them localy for the local F-bodies (camaro's and firebirds...ect) they are going to but 5-7 units, at least thats the plan now weither not they will go through with it is another story.

oh and as far a putting a turbo in the engine bay on the camaro it is VERY VERY tight under the hood so it would be VERY expensive to put it under the hood. thats why many go the supercharged route.
 
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