sts twin turbo




I understand the disadvantages that some of the more knowledgable members just mentioned, but here are some of the advantages:
1. Could look almost like a "stock" motor under the hood, instead of turbos or a blower clogging up the engine bay.
2. May not create optimum power, but, when speaking of 575RWHP compared to 650RWHP its all about the driver anyway, so thats really irrelevant, driver skilll and traction come into play far more than extra power at 550+.
3. The extra lag actually makes the car more driveable. 1st and 2nd gear are virtually useless (street tires) with these cars anyway.
4. The car actually sounds like a fighter jet.
If you guys watched the supercars exposed with the ZR-1 vs the Porsche Turbo, also featured on that episode was a 800HP C6 monster with STS rear mounted kit.
This is just my opinion and having said that, I would probably take a closer look at the tech disadvantages stated by other members if I were going to put this system on my car.
Short distances between a head unit (turbocharger or supercharger) and the intercooler/intake also help to eliminate pressure drops. The amount of piping from the turbocharger to the intercooler is also not optimum when the turbocharger is 10 feet away.
The piping is also not very straight, making the distances further than needed. Then you have the oil lines feeding all the way to the rear of the car. God forbid you have a leak, you'll likely never know until it's too late.
Running turbochargers after cats is a very bad idea. When/if the cats go your engine injests the trash. You couldn't design a worse scenario.
San
What he said!
Plus who would butcher the new Corvette and run pipes thoughthe body..
Last edited by 3 Z06ZR1; Nov 2, 2009 at 11:54 PM.
if there is an air leak before or after the turbos wouldn't the car run pig rich? How is that deadly?
heat per se does not make power. It ultimately kills turbos--heat makes the gases faster but also less dense. So there is probably a perfect temp for optimal operation but what is it?
The piping distance and pressure equalization (lag) makes sense but is it actually felt in the real world or just an academic exercise.
Longer oil lines and intercooler lines--(see piping distance comment above)chance to cool the oil for the turbos(run cooler) and the intake charge as well. Both a good thing right?
weight distribution. But some of the weight of the kit over the rear tires cant be a bad thing either.
No new hood, no real cutting of the car's body either so...........
I think the kit is too loud but to each his own.
Again just spit ball'n here- trying to learn stuff. It seems that this design has some real benefits but in the end, do the benefits outweigh the negatives? Seems that $$$ cars with factory turbos would be using this design if it were so much better but I do not think they do--why? Maybe it isnt all that.
Last edited by knkali; Nov 3, 2009 at 12:25 PM.




A mutual friend of mine and Craigster who had the STS kit on his GTO which was much more simple than the corvette with the dual turbo runs worth of piping, had to continually look for leaks when the system would show lower than normal boost. He stated that the time it took to find and repair these leaks would have broken the bank had he not done the install himself and fixed it himself. Its deadly to the wallet.
Most facilites charge 100 an hour to find leaks and in all those connections and pipes, it tough to find. He had to weld stress cracks. It wasnt just the typical loose hose connector. Ask anyone with a simple centrif supercharger how hard it is to find a leak on that small amount of air path and then you will see what deadly meant when you add 16 feet of tubing in places you cant readily see.
Lastly, most people run turbos to exceed the performance of supercharging. In these cases they dont run a MAF sensor because it runs out of fueling range. If you are in this class of boost the car is running in speed density. If one side did develope a leak even with the MAF in place, it cant do dual fueling since both sides merge to a sole MAF for a measurement.
Last edited by SpinMonster; Nov 3, 2009 at 06:41 PM.



if there is an air leak before or after the turbos wouldn't the car run pig rich? How is that deadly?
Guy answer
heat per se does not make power. It ultimately kills turbos--heat makes the gases faster but also less dense. So there is probably a perfect temp for optimal operation but what is it?
The turbos in the rear run cooler which is better for the bearings. Turbos under the hood add to much heat. They have to reach operating temp to work efficently and then cool down to save bearing life. So a turbo will be very hot under the hood and very cool under the car. Depending upon your needs each can be made to work well.
The piping distance and pressure equalization (lag) makes sense but is it actually felt in the real world or just an academic exercise.
The longer the pipe the less pressure. The lenght and many bends builds resistance but also cools air. So you need a larger pipe to gain optium boost. Cooler air is good, but you have less boost! and metal pipe heats up in the warmer temps
Guy covered the problem with leaksLonger oil lines and intercooler lines--(see piping distance comment above)chance to cool the oil for the turbos(run cooler) and the intake charge as well. Both a good thing right?
oil needs to reach operating temp in order to work efficently.... you do not beat on a cold engine! and extremely hot oil will cook the bearings a cooler intake charge is always good Guy answer the oil leak
weight distribution. But some of the weight of the kit over the rear tires cant be a bad thing either.
No new hood, no real cutting of the car's body either
yes but there is a roots system that will fit under the hood check the search on the CF
Good luck & enjoy
.
Last edited by Tommy D; Nov 5, 2009 at 12:10 AM.
The Best of Corvette for Corvette Enthusiasts
Thanks for the x. I understand the physics of what you are saying. The questions still is does it make a difference in the real world. IOW what is the drop in boost from the piping? Is it significant? Cant it be detected by the driver? Does the cooler intake charge offset this potential drawback?
Spin,
Your X is very clear now. Funny how STS owners are not very vocal on this this thread or others in the past. Maybe they are too busy driving their cars.............or looking for leaks?
Other considerations:
As delivered, the kit is very susceptible to damage from road debris. A shield would have to be fabbed up.
Dedicated oiling is a must. Oil lines to the back are a disaster waithing to happen.
The kit is heavy, as it relies on steel piping. AL piping would be better. Baker sells an assortment of mandrel-bent Al to fit any requirements.
With the turbos so far away from the heat, you really want ball-bearing, smaller units like the GT35. These units will deliver acceptable response, but the will not keep up with airflow requirements past 6-7psi. At that point, they are operating outside the compressor curve, on the edge of surge, which means IATs are elevated despite the remote turbo locations.
Lag is a problem, not so much because of lack of heat (that is also definitely an issue), but because the compressors have to pressurize a much larger pipe volume than a normal setup. In fact, the delay can be problematic in regulating boost and boost fueling.
There's more but I have to move on. Bottom line, if you are on a budget, can score a complete STS kit for $3,500-$3,700, are prepared to do extensive work to render it reliable and adress shortcomings of the kit, and have no plans to ever go over 5-6psi boost, (=130 more HP), then go for it. Otherwise, pass and spend the same money on a H&C kit which will also deliver the +130.
Other considerations:
As delivered, the kit is very susceptible to damage from road debris. A shield would have to be fabbed up.
Dedicated oiling is a must. Oil lines to the back are a disaster waithing to happen.
The kit is heavy, as it relies on steel piping. AL piping would be better. Baker sells an assortment of mandrel-bent Al to fit any requirements.
With the turbos so far away from the heat, you really want ball-bearing, smaller units like the GT35. These units will deliver acceptable response, but the will not keep up with airflow requirements past 6-7psi. At that point, they are operating outside the compressor curve, on the edge of surge, which means IATs are elevated despite the remote turbo locations.
Lag is a problem, not so much because of lack of heat (that is also definitely an issue), but because the compressors have to pressurize a much larger pipe volume than a normal setup. In fact, the delay can be problematic in regulating boost and boost fueling.
While I don't own a Corvette, I did get suckered into the STS hype and tried the twin kit on my '07 Mustang GT. My experience with STS prompted me to discourage anyone from buying ANYTHING from them. The electric scavange pump will be the first component to fail, and when it does, you will need a tow truck. You may not have engine damage or damaged turbos, but you will not be able to drive the car.
As long as the scavenge pump is functioning, the STS kit will deliver everything it advertises, but it is not reliable enough to put on anything but a dedicated track car. Not to mention that STS customer support is some of the worst in the aftermarket perfomance business. They are friendly and knowledgable until they have your money. If you have a problem that cannot be resolved with a canned response, you are on your own.
The best thing a person can do is talk to as many local tuners as they can find to get an opinion on the STS kits. When I asked around about STS, the overwhelming respons was "Yeah, I've FIXED several of those". If I had done this excercise in the first place I would have saved a big chunk of coin, and I would have a F/I Mustang that would keep up just fine with stock to mildly modded C6's. Instead I have a nearly stock Mustang, a pile of useless turbo parts taking up space in my garage, and significantly lighter wallet.
While I don't own a Corvette, I did get suckered into the STS hype and tried the twin kit on my '07 Mustang GT. My experience with STS prompted me to discourage anyone from buying ANYTHING from them. The electric scavange pump will be the first component to fail, and when it does, you will need a tow truck. You may not have engine damage or damaged turbos, but you will not be able to drive the car.
As long as the scavenge pump is functioning, the STS kit will deliver everything it advertises, but it is not reliable enough to put on anything but a dedicated track car. Not to mention that STS customer support is some of the worst in the aftermarket perfomance business. They are friendly and knowledgable until they have your money. If you have a problem that cannot be resolved with a canned response, you are on your own.
The best thing a person can do is talk to as many local tuners as they can find to get an opinion on the STS kits. When I asked around about STS, the overwhelming respons was "Yeah, I've FIXED several of those". If I had done this excercise in the first place I would have saved a big chunk of coin, and I would have a F/I Mustang that would keep up just fine with stock to mildly modded C6's. Instead I have a nearly stock Mustang, a pile of useless turbo parts taking up space in my garage, and significantly lighter wallet.





No issues.
Massive power (572 rwhp).
great service and great people.
I have no idea what all the ha-bub is about. The rear mount takes the heat out of the engine bay and sounds cool. It spools up as quickly as any other turbo I've owned. Other than sounding like a jet out the rear, it basically operates as any other turbo as far as i can tell.
there's a lot of "misinformation" out there regarding the rear mount STS system. I'm not sure why.
true the exhaust gas is cooler but then you can say the intake is cooler also... soo each system is its own animal with pros and cons not better not worse just different
all turbos have lag front mounts have less and if you compromise with A/R then you sacrifce high end flo of the turbo
superchargers have a certin amount of loss too...although i made 220+ rwhp extra at only 8lbs....thats pretty good of you ask me
maybe the new edlebrock e force might be the ticket for you ...fits under the hood
i have the A&A v3 at 8lbs with meth i love thie big motor feel of it ...
ZERO lag
truth is the superchager is also somewhat cheaper, not by much but it is...and their are plenty of good vendors that are running specials
IMHO find members to give you a ride in each type. spend time in them, not just at full throttle, but traffic highway runs and puttering around town
some people like the turbo lag/rush some dont some like the whistle some dont
most important do research.
Last edited by gengiskhan; Dec 15, 2009 at 07:45 PM.
While I don't own a Corvette, I did get suckered into the STS hype and tried the twin kit on my '07 Mustang GT. My experience with STS prompted me to discourage anyone from buying ANYTHING from them. The electric scavange pump will be the first component to fail, and when it does, you will need a tow truck. You may not have engine damage or damaged turbos, but you will not be able to drive the car.
As long as the scavenge pump is functioning, the STS kit will deliver everything it advertises, but it is not reliable enough to put on anything but a dedicated track car. Not to mention that STS customer support is some of the worst in the aftermarket perfomance business. They are friendly and knowledgable until they have your money. If you have a problem that cannot be resolved with a canned response, you are on your own.
The best thing a person can do is talk to as many local tuners as they can find to get an opinion on the STS kits. When I asked around about STS, the overwhelming respons was "Yeah, I've FIXED several of those". If I had done this excercise in the first place I would have saved a big chunk of coin, and I would have a F/I Mustang that would keep up just fine with stock to mildly modded C6's. Instead I have a nearly stock Mustang, a pile of useless turbo parts taking up space in my garage, and significantly lighter wallet.
Remember one big thing here, with the internet in the last 5-10 years totally blowing up with new and old manufactures in the game do some research and get whats more comfortable with you and contact someone who has a system,,,thats the best place to start anyway









Keep the pipes short and enjoy the reiability.
Your Grand Sport is one awesome car. Enjoy it.










