Well, I went for a ride in an Purevil/5litereater's sts car. Quick breakdown of the car:

LS1 Z28 6 speed
Forged block
LS6 ported heads
small turbo cam
9" rearend
STS with T70 and FMIC

At 14psi he is at 700rwhp. I believe he only had it set at 12psi when we ran. The car screamed and he only revved it to 5k rpm before shifting due to his oil pressure alarm going off. Full boost seemed to have hit just under 4000 rpm. With a decent size turbo mounted back there some lag is to be expected. Once you get out first gear lag becomes non-existent when the motor is wound up and the rpms drop for the next gear. All in all the kit is very clean and the car gets up and goes. It really sucks you back into the seat when that turbo spools up. For those of you on the fence about buying a clean, easy to put together kit, try and go for a ride with a board members car if possible. I am still going front mount with my T76, but I respect Mike's ride and am amazed at his power output.

 

whats up with that

 

either the pump is faulty or not adjusted perfect yet. Im working on it

 

You need the high volume pump.

 

I have the high volume pump, I already talked with brady, the adjustment is off, its not a constant alarm either, just a quick beep. Most likely boost pressure bleeding back in. I will get it right this weekend with slowhawk

 

To bad you didn't stay longer.I took it out and beat the snot out of it.2nd -4th gear redline a few times.I set the boost back to 14lbs

 

I can top that!

I got to drive Rick's T/A. Yes, Rick, the guy who came up with the whole STS Invention. Been a friend of his for a few years now, before his turbo got all the media attention that it has now, and a few months ago, before his engine died/got yanked, he let me drive it!

Only thing I have to say about it, is this:

 

How ironic. I was about to come in this section and start a thread with an identical topic. I myself got a ride in an STS equipped LS1 car yesterday.


My thoughts:

The car was an automatic 2000 TA, 323 gears, stock LS1 motor. STS kit with all coated pipes, T67 headunit, tial wastegate venting to atmosphere, tial blowoff, electronic BC, no intercooler or meth, running 7 psi when I rode in it. Also had LS1 edit tuning in it. First, seems odd, almost wrong to hear all the noise coming from the rear of the car, but anyway...... Full boost seemed to hit about 4500rpm. Where boost started to initially come on I dont know, because his boost gauge wasnt lit up and it was nighttime. I do know that any boost that hit below 4500rpm was un-feelable. Car felt like a normal LS1 up until about that point. When it hit boost it hit hard enough at 4500rpm that the tires just let loose. My main thought about performance boiled down to even if you could hook the car up, it spends so little time per gear in meaningful boost, that it still wont be all that fast.

As far as what it looked like on the car. pipes look nice, the coating anyway. The bend where the exhaust goes into the turbine looked real tight and somewhat restrictive. At one point in the rear there is a pipe (literally) that is less than 3 inches off the ground. thats scary IMO. I dont know if at one point someone said the welds were all done with a tig, but they appear to be mig welded throughout. Also, what's with the weird PCV thing in the engine bay? I thought that was interesting, but not very effective. I think it will still pressurize the case. Also, the owner of the car said that the "sock" over the air filter gets wet when driving in the rain, but the filter appears to be somewhat dry. if the sock is getting wet, the filter is too, and I pointed out that the reason the filter was somewhat dry is due to all the airflow through it. So it appears they do suck in water. hmm....... How thick is that pipe that "acts" like a subframe connector??? Is that thing as thick as sewerpipe?? How much does that piece weigh anyway?

The owner was happy with it, and I suppose it is novel to blow the tires off at 60 mph. Also, the owner said they were seeing 100 degree IATs with no meth and no cooler. Any thoughts on that?

 

where is this pipe hanging 3" from ground? where the turbo sits is right near the axle, for anything there to hit, you would have to run over a curb or compress the rear suspension to the point the tires go through the quarters to get at it. no boost till 4500rpm? its a stock motor with a T67... first post was a car with a T70 making 700rwhp, of course its going to lag. needs a converter.

 

5.0this - Mike's car has the T70 and full boost hits at ~4k, I dont see how the t67 spooled at 4500rpm? Thanks for sharing anyway.

 

john I did some more runs and its hitting 14psi now at 3500ish, feels good.

 

 

Maybe it has something to do with the horrible design and the fact that the turbo has to fill like 120 ft of pipe before the motor sees boost


Just a guess though, could be some other reason.

 

How dare you bring facts regaurding airflow dynamics into this thread?

 

If you think that the STS has "like 120 ft of pipe before the motor sees boost" is a "fact regaurding airflow dynamics" then you are smoking some serious crack. I doubt that someone who can't even spell regarding correctly is going to teach me anything about airflow dynamics. Speaking of airflow dynamics, here's a free lesson for the STS haters with no technical data of their own:

The pipe going from the turbo to the motor is about 12 feet long, and 2.5" in diameter. This computes to 0.52 cubic feet of volume. Even if the length were a foot or two longer, it's not going to compute to any serious amount of volume. Now, a T70 is capable of flowing 84 lbs/minute, or 1217 cubic feet/minute at full speed. Since the turbo will not be flowing max airflow leaving at 2000 rpms or so, we have to take that into account. Even assuming a street start at one-third of max rpms, the turbo will still produce ~28 lbs/min, or 405 cfm. How long will it take 405 cfm of turbo output to fill .52 cubic feet of volume? Less than one-tenth of a second! (0.077 seconds, to be exact)

Is the STS as efficient as a front mount? Nope. But it can still be DAMN effective if setup correctly. The 700 rwhp in 5-liter-eater's car is impressive, and the numbers speak for themselves.