Looks like Stillen is starting to pull ahead in the S/C race. How will GTM respond? Congrats on your setup, POST DYNOS!

By not having to retune all their previous installs?:stirthepot:

No, by getting 8psi with aftermarket exhausts. Frankly, if you compare it to the GTM S/C problems, Stillen is definitely ahead. Its much easier to resolve an issue with an UPRev rom or tune than realize that your kit doesn't work well with free flowing exhausts.

Its been over three weeks and they cant figure out my tune. Id rather run 6 psi and have my car run than 8psi and not run.

Plus I think that only pertains to LTHs which they had said from the beginning that that might be an issue. But not 100 % sure.

The loss of psi is from the long tube headers, there have only been two supercharger installs with long tube headers, both of which are GTM kits. Mine is doing very well, but that is for other threads.

Lets not spread false information.

3 weeks? that's it? c'mon, i'm at week 7 without a car now.

That sucks sorry to hear that. i got my car back 7/7/10 so im at 5 weeks. Any word from stillen regarding your car? I was told last week a fix was coming soon and not to drive the car unless its my everyday car then its ok but they dont know what damage driving the car will do.:ugh2:

last i heard uprev was going onsite today to fix the remainder issues. Will try to get update tomorrow.

You are also close to there ambient temps and similar dyno conditions

same elevation also san jose 87 feet stillen 101 feet above sea level. Stillens base line dyno was 95f and there dyno after supercharger was 65f ambient temps. My dyno temp after supercharger was 69f

Just want to give everyone an early morning update:

As planned Jared flew in yesterday morning and I picked him up at the airport at 9:00 A.M. Unfortunately he was feeling under the weather and was unable to work at the shop yesterday and went straight to the hotel to enter a Nyquil coma. I picked him up this morning and he was feeling much better and was able to get to work on the car. So, we lost a day yesterday but we're back up and running today. Hopefully we will have more updates soon.

Right on Kyle, in for updates.

what a pussy - man it up bitch:icon17:

thats what she said.

wut?

About spreading false information: Headers don't cause supercharged cars to lose boost.

From a physics standpoint, increasing exhaust backpressure makes it harder to get exahust gas out, which makes it harder to get fresh air in. If you apply resistance to the outlet side of a compressor, the pressure goes up. Reducing the resistance increases volume of airflow and decreases pressure. Think of the tire compressor at a gas station. When the valve is shut, it is flowing zero cubic feet per minute and making 150 psi. When you open the valve and it's flowing air into your tire, it's flowing, say 10 cfm and making 35 psi because of the resistance in your tire. When you open the valve and let it blow into the atmosphere, it's flowing, say 20 cfm, but making 0 psi of pressure.

Now, cars make hp by burning gasoline with air at a fixed ratio. Having air under pressure doesn't let you burn more gas and make more power. Having more AIR let's you burn more gas and make more power. Boost helps you get more air in, but like in the analogy above, if there is less resistance, like blowing the tire filler into the atmoshpere, there will be less boost, but more total air moved, which will give more power.

So, long tube headers are NOT decreasing boost (with the implication being that if you have less boost, you are making less power). Headers simply decrease the outflow resistance so the boost level is whatever your compressor can make against the closed intake valves.

In the case of the GTM supercharger, they are using a smaller unit that reaches max boost and flow characteristics at a lower RPM, but then at higher rpm, the unit does not increase airflow in the linear fashion that engine consumes air. This leads to a drop off in boost. It gives a nice fat torque curve that falls off at high rpm, similar to what you see on most turbo cars. Then, when you couple that with a free flowing exhaust, the boost numbers are lower than predicted in the higher rpm range, but will likely be same as predicted in the lower and mid range.

GTM's higher stages of their supercharger kit use a larger compressor and you probably won't see the fall off in boost at high rpm (even with headers), but the torque curve will probably look more like the unit that Stillen has developed.

Never mind, I am leaving this thread as there is just to much wrong information from all sides.
Stillen, hope you and Uprev can resolve your issue and start pumping out more kits quickly.

this+++

i have used the same blower used in the GTM kit on my old tacoma 4.0. when i installed headers, i did drop about 1.5 psi, but i also gained 15+ rwhp from 2500 rpm and up.

i generally stay out of these types of arguments, because in general people are to ill informed on how a supercharger actually works.......the people that DO know the above, already know it :ugh2:

and I got yelled at when I posted about flow vs psi in Shumby's thread..

:iagree:

Does anyone have the stillen SC kit with FI's LTH installed?

how was the dyno? :pics: please

That was cause you were making sense and applying common sense

and I will post some up when I get em

paging prof einstein, can you please clear this up?

A lot of people are just ignorant in understanding the process and to the terms used. Boost is loosly used in conversations about turbos and supercharges in large part because boost is the only parameter that can be measured and used to "compare" peformance in like applications. Unfortuanately we can't measure the actual air volume entering into the intake.

As mentioned above boost refers to the amount of resistance to the air flow produced by FI systems. Boost is relative to the amount of air that can be "forced" (hence the term "Forced Inductions") into the engines cyclinder while the intake valve is open. There is only a small duration that the intake vavle is open on any given cylinder while all the others are closed. This is going to provide resistance to the air being forced into the intake by the FI system.

Just remember that boost can only be used to compare peformance of like engines with like FI sytems. All Z's for instance will make the same horsepower (provided all peformance accessories are the same, i.e. headers, cats, etc.) at the same boost levels provided from different FI systems, PROVIDED that the the FI sytems are delivering the same amount of air at the same rpm. Since different FI sysytems spin faster or have larger impellers they will move more air than smaller ones and will produce more "Boost" at lower rpms and produce more power. The reason for the increase in boost is due to the larger systems trying to "Force" more air into the cylinder when the intake valves are open.

"More air being forced against the same resistance will increase pressure (boost)". Example: a fan moving 100 cfm through a 4" diameter pipe may produce .5 psi at the discharge of the fan. When you replace the 4" pipe with a 2" the air flow decreases and the pressue at the discharge of the fan increases. Now install a larger fan that can overcome said resistance and make it large enough to produce 100 cfm throug the 2" pipe than you will see 100 cfm at a much greater pressure at the discarge of the fan.

P2/P1=(cfm2/cfm1)squared

Where P=pressure and CFM=cubic feet per minute of air volume

The equation above is a statement that states: that an increase in air volume through the same area (say a motors intake) will increase the pressure in the intake by the "square" of the cfm or air volume increase.

:iagree: LOL, I'm not even gonna get into it.

This thread = :drama: and I feel bad for stillen!

I feel bad for the people that got duped by stillen and bought a kit before it was ready to be sold. Stillen got their money the rest of us got a supercharger that may or may not blow up their engines.

Where are you getting your information regarding the kit 'blowing engines'? I have not heard this from any other source besides you.

+1:iagree:

i called stillen on friday and they dont know what would happen if i drive my kit with the tune they gave me. i asked if it could blow the engine and they didnt know for sure but they said it could be a possibility. they told me to drive it if its my everday driver but if its my weekend care i would be better off not driving it because they dont know what damage it could be doing to my car

ouch.. I think my plans for FI are quickly dissipating. Contemplating keeping the Z clean with supporting mods only. And ill pick up a used 996 and build the hell out of it lol.

Not interested in GTM's offering?

Will see how things turn out, i keep thinking our cars are so new. And that it will take time to work things out. Its been almost 2 years, and i feel things will start getting ironed out soon. I'm feeling a tad disappointed with my Z. But that's just me, love it, abuse it, then kick it to the curb! Its possible my Tune, wheels and suspension will revive my love for my car.

My car is still running very good with the kit.

I do like the SC option for pure ease of installation / cost
Personally I think TT is the better option, but each their own, I am not knocking anyone who has splashed on the SC kits, just wish you guys the best in getting reliable,quick Z's.

Lets face it factory stock 370's are slugs.

So the kit has issues and Stillen has acknowledged that many times and has advised you to not drive the car while they work on a solution. How does that transform into it being kits that may blow an engine? The tune isn't correct on your car and Stillen has told you that they are working on a solution and in the meantime not to drive it, if your engine blows from driving on it you really have no one to blame but your self.

I'm sure Stillen is providing a rental car since he can't drive the car with their flawed tune.. :stirthepot: