STS REAR TURBO KIT

[Black86]

I'm interested in this. Don't know how it compares to a full blown turbo kit as far as power you can push and ect but wouldn't be a bad idea. Sounds wicked too! If it can hit 400whp+ just like the other kits and spool that much quicker sounds promising to me. Anyone have any dyno or in car footage?

[King Tut]

Originally Posted by Black86

I'm interested in this. Don't know how it compares to a full blown turbo kit as far as power you can push and ect but wouldn't be a bad idea. Sounds wicked too! If it can hit 400whp+ just like the other kits and spool that much quicker sounds promising to me. Anyone have any dyno or in car footage?

What would lead you to believe that turbo for turbo this kit would spool faster?

[SomeoneWhoIsntMe]

Originally Posted by King Tut

What would lead you to believe that turbo for turbo this kit would spool faster?

a fundamental misunderstanding of basic concepts of thermodynamics?

it's remarkable that fans of rear-mount turbos brag about the extra feet of charge piping under the car "working like an intercooler", while they totally ignore the heat loss in the exhaust piping.

[Cross]

Originally Posted by SomeoneWhoIsntMe

a fundamental misunderstanding of basic concepts of thermodynamics?

it's remarkable that fans of rear-mount turbos brag about the extra feet of charge piping under the car "working like an intercooler", while they totally ignore the heat loss in the exhaust piping.

Many just wrap the exhaust piping to negate said loss, just like those of us with it like having an engine bay not crammed with such "Hot Exhaust" next to things that really don't always react as well to it.

But then I have an intercooler and E85 with my rear mount so I guess I am using the best of both worlds with how mine is setup.

[Roxy86]

if the turbo sits under the trunk....
how long is the inlet pipe from the turbo? and please show dyno graph of the "No boost lag" claim
I also thought that by retaining heat inside the turbine increases turbo efficiency = spool.
By having it under the trunk un-shielded against cold air, only benefit I can see is the intake air getting cooled.

[Cross]

Originally Posted by Roxy86

if the turbo sits under the trunk....
how long is the inlet pipe from the turbo? and please show dyno graph of the "No boost lag" claim
I also thought that by retaining heat inside the turbine increases turbo efficiency = spool.
By having it under the trunk un-shielded against cold air, only benefit I can see is the intake air getting cooled.

I haven't made any claims of there being "no lag" I have explained how you get lower amounts by using smaller charge pipes but I believe I have even stated with my intercooler setup my boost on a manual boost control starts around 3200 - 3500 rpm.

As for heat again heating the very air you are charging increases heat on the cool side.

By wrapping your exhaust pipes going back and using a turbo blanket like most do with any turbo setup now the fears of loss are greatly reduced.

While there has been a lot of requests for dyno proof I have not had the time. However a simple Google search shows the dyno charts of Corvettes, Camaro, Trans Ams, Mustangs and many more running and dynoing with rear mounts. This isn't a new idea it's just unconventional. Each has its own merit's. I personally enjoy mine but if I was to change it I would put it around the trans because I like not having it in the engine bay.

[Roxy86]

Originally Posted by BuhhDill

I stumbled across this kit on youtube and thought that it was a win across the board.

No extra engine bay heat
No boost lag
Decent price ect.

I should rephrase since it was a more of...."have you seen this" thread from the OP.

[Cross]

Originally Posted by Roxy86

I should rephrase since it was a more of...."have you seen this" thread from the OP.

I have tried to stick to providing real world FRS results since I have the prototype and can answer many of the questions asked. Hints my responses concerning heat, lag, etc.

The OP may have made that claim but as far as I know there are less than 5 users running this and I am one of the most vocal on answering questions.

[Simon99]

I'm gonna ask a stupid question, flame me if you'd like, but I never ran a turboed car without intercooler. Could a pipe like this ( http://www.siliconeintakes.com/produ...3057cfa4a9778d) reduce the temperature just a bit to increase efficiency (or be manifactured longer to do so from the back of the car) or i just sound stupid ?

[Cross]

It's been brought up before and it could but being under the car it would probably ending getting damaged on one side however it should do something. Wouldn't hurt to see it tested.

[andrew20195]

Originally Posted by Cross

I haven't made any claims of there being "no lag" I have explained how you get lower amounts by using smaller charge pipes but I believe I have even stated with my intercooler setup my boost on a manual boost control starts around 3200 - 3500 rpm.

When people refer to "lag", they are either talking about boost threshold or transient response. You're talking about the RPM where the turbo starts to create positive relative pressure: boost threshold. It would not be affected by length of piping as much as transient response. What I would be interested in seeing what the transient response looks like with this system. How long does it take to build boost transitioning from a steady cruise to wide open throttle? It will vary with RPM and gear, of course.

[Cross]

Originally Posted by andrew20195

When people refer to "lag", they are either talking about boost threshold or transient response. You're talking about the RPM where the turbo starts to create positive relative pressure: boost threshold. It would not be affected by length of piping as much as transient response. What I would be interested in seeing what the transient response looks like with this system. How long does it take to build boost transitioning from a steady cruise to wide open throttle? It will vary with RPM and gear, of course.

Response really seems quite quick but I honestly can't say I have made any attempts to measure length of time but I do have some logs from the brag strip. However those may not be as useful as just a log from cruising to WOT.

Is there a preferred test method? I would think which great would effect load which would effect results.

[andrew20195]

Originally Posted by Cross

Is there a preferred test method? I would think which great would effect load which would effect results.

Load would definitely have an effect. I would think 3rd and/or 4th gear runs starting at various RPM above the boost threshold, e.g. 3500, 4k, 4500, etc., and running in both directions to average out slope and wind. Admittedly, the data aren't really useful unless you have something to compare it to, but it would be nice for someone to start collecting it.

I guess most people are too busy enjoying their new power to bother testing these things.

[Cross]

I have some 3rd gear pulls at lower boost from when I was trying virtual dyno. But they start at 3000.