Rear mounted turbo

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Dec 22, 2003 | 06:23 PM

#21

ANTI VENOM

Thread Starter

Melting Slicks

Joined: Oct 2000

Posts: 2,158

Likes: 9

From: N.E. WA

Re: Rear mounted turbo (vvv90)

I have yet another question. I have seen some turbo manifolds that have 90* turns in them. These are not mandrel bent turns. These are just two pieces of pipe welded together at 90* angles. I believe they call them "logs". How much does this hurt the performance. You can see an example of them on this LS1 here. http://www.ls1motorsports.com/Single_Turbo.asp I also noticed that the manifolds differ in design drastically. Will this have any effect on how one side of the engine runs compared to other? I realize that both sides are pushing exhaust into a common turbo, but it seems like it would effect something.

Dec 22, 2003 | 06:28 PM

#22

neat

Melting Slicks

Joined: May 2001

Posts: 3,014

Likes: 18

From: Raleigh, NC

Re: Rear mounted turbo (ANTI VENOM)

When air is under pressure, it behaves almost more like a fluid than a gas. You can get away with sharp turn's without big problems.

Dec 22, 2003 | 09:48 PM

#23

BillWelter

Instructor

Joined: Jul 2003

Posts: 114

Likes: 0

From: Colorado Springs CO

Re: Rear mounted turbo (ANTI VENOM)

The Turbo lag on that system would be incredible! It would take a while to spool the turbo because the exhaust tract volume is huge, and then the system would have to compress air through all of that intake plumbing, too!!

Dec 22, 2003 | 11:31 PM

#24

Baldturbofreak

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Joined: Nov 2003

Posts: 1,637

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From: Honeoye Ny

Re: Rear mounted turbo (BillWelter)

not true bill we are talking about what 10 feet at most of pipe? the velocity coming out of the turbo is around 350 ft per second (when the tubing is sized on the smaller side.) when she hits boost hard. the internal volume of the piping is less or comparable with that of a big air to air intercooler. MY turbo setup is a "proper" front mounted close to the motor 8-4-1 header setup and even I dont get full boost before 1st gear is over. Thats a good thing 'cause second and third are damn near uncontrolable. :reddevil

Dec 23, 2003 | 02:11 PM

#25

ANTI VENOM

Thread Starter

Melting Slicks

Joined: Oct 2000

Posts: 2,158

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From: N.E. WA

Re: Rear mounted turbo (Baldturbofreak)

After looking at my car, I don't think it will be that difficult to install a single turbo up front. I do see the beauty and simplicity in the rear mounted turbo. I would like to ride in a car properly setup with a rear mounted turbo.

Dec 24, 2003 | 12:33 PM

#26

Baldturbofreak

Drifting

Joined: Nov 2003

Posts: 1,637

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From: Honeoye Ny

Re: Rear mounted turbo (ANTI VENOM)

If anyone does try this out, I found a VNT GT37 that would completely eliminate all lag. It will need an electronic controller (which I also found) to control vane position and therefore boost, but man youd have boost just off idle, and it would be loose as it can be on the hot side due to the fact that boost is controlled by the variable geometry turbine (no wastegate). I'm trying to get my old man to let me put his v6 s10 under my knive with this same setup. Oh by the way that turbo I mentioned is off the '03 frod diesel 6.0 liter.

Dec 25, 2003 | 08:31 AM

#27

Rkreigh

Race Director

Joined: Dec 1999

Posts: 10,230

Likes: 885

From: Alexandria, Virginia, USA VA

Re: Rear mounted turbo (Baldturbofreak)

Quote:

that turbo sounds very interesting, chrysler did some of the variable vane turbos a while back and varying the vanes and eliminating the wastegate is very appealing, best of both worlds, low restriction at full boost, and full boost earlier!! any sources other than ford for this turbo?? two of em would be plenty!! thanks