GT Motorsports: 370Z Supercharger system development

DannyGT

Very nice.

We all know downpipes/exhaust should give us at least 20whp so add that + the fact he is tuning for 91*...I think I could really hit my goal of 420 - 450 @8ish psi with 93* and water/meth system.

Sam, will you be tuning with 93* to work on custom maps for us guys in the eastcoast

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Performance GTM Stage 1 SC, GTM Res.Test Pipes, Invidia Gemini Exhaust, GTM HD Oil Cooler
Wheels & Suspension AME Tracer TM02's 19x9.5F 19x10.5R w/ 265x35F & 305x30R, Hotchkis Sways, BC (BR) Racing Coilovers (Car Sold)

NYBladeZ

We're all getting tired of speculation lol, GTM its getting hard to stay patient, how about that press release to satisfy the mob already

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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling

Z eliminator

Now that we see how much power the sc made at 5 lbs boost was a bit of a let down.
at 2 lbs boost it made 18.5 rwhp / 1 lb of boost/ When we look at the the SC at 5 lb's we see that its makeing 11.8 rwhp/ 1 lb of boost.
6 lbs = 70.8 rwhp = 355.8
7 lbs = 82.6 rwhp = 367.6
8 lbs = 94.4 rwhp = 379.5
9 lbs = 106.2 rwhp = 391.2
10 lb = 118 rwhp = 403.0

Now that standard rwhp. the SAE number will be lower. I now estimate tha on a my 7 AT. it will make 353 @ 8lb. and 368 @ 10 lbs. SAE. A 6 mt will make about 5% more than a 7 AT. To compare RWHP of my ported stillen M-62 on my 2003 350z 5 AT. it made 11.78 rwhp to 1 lb of boost. Base line 218 to 313 with the stillen SC on the 350.
When I added headers to the 350 it lost 10 hp. when i put the high flow cats on it lost 6 more hp.
The numbers on the GTM are lower than i first estimated to be But Sam is working on it and im sure that he will make it better. No matter what it makes i have bought it and Sam has assured me that it will run well. Once he has fine tuned the maps, there could be a lot more power.

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12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

RCZ

^ a change in temperature might make a 20whp difference. No one is saying the supercharger is blowing hot air either. I am assuming charge temperatures are hotter with the sc, but not enough to justify that much variation in hp. Remember that there is an intercooler between the turbos and the engine as well as between the sc and the engine. That cooler should be able to bring the air temps down to similar levels.

5psi is not harder to imagine than 20psi. Its the same thing.

Are we to assume that this supercharger is blowing hot air by your logic? I certainly hope not. We know charge air temp makes a difference, but their tt kit made like 400 at 5psi. How is the sc making 400 at 10psi.

I think I'm going to ease up on asking any questions here until the official numbers are released, there is not enough real finished kit data, so we are all just making assumptions... and you know what happens when you assume.

Also, Z Eliminator, either you are really talking worst case scenario or the kit has a long way to go because 10psi on a high compression motor like ours should net more than 70hp.

Silo

I didn't mean to make any assumptions on the supercharger, I just wanted to point out that your "5 psi is 5 psi" statement and your conclusion regarding how everything that puts out 5 psi should be making the same power is simply wrong.

Because I am lazy (and the fact that I am not a native english speaker) I will "lend" a good explaination of efficiency I found in another forum:

shumby

so this thread has now turned into a bunch of bla bla bla.... flux capasitor...... bla bla bla..... highspepd muffler bearing.....bla bla .bla



lets keep this to GTM and wait for their final numbers if you want to fight about what makes what and what temp //psi something should make start a new thread.

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Originally Posted by SAM@GTM
Engine detonation is not normal and it should never never happen, and whoever told that need to do something else for living .
Sam

RCZ

Yeah we should just buy everything without understanding what it does first. That sounds pretty logical. We aren't fighting, everything we are talking about is directly related to the GTM supercharger and the results that have been given so far. Its just a discussion about their results, but to be able to make sense of the results you have to understand the mechanical aspect of how they arrive at those results. Things aren't lining up technically and that makes a big difference to those people who buy things with their eyes open.

Don't forget you are in the tech area, not the classifieds.

I say this with the best intentions and humbly because I dont pretend to know everything, I know there are folks in here that know a lot more than I do. Maybe you should make an effort to understand what all that bla bla is? You would enjoy this thread quite a bit more. Nothing personal you know me by now, no need to get defensive.

DannyGT

I completely agree here. This is good info.

The only thing we all need to understand is, there is alot of info thats incomplete that only GTM can provide/explain at this point.

I'm sure the tune around the exhaust system + higher octane will make alot of people (east coast ) happy.

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Performance GTM Stage 1 SC, GTM Res.Test Pipes, Invidia Gemini Exhaust, GTM HD Oil Cooler
Wheels & Suspension AME Tracer TM02's 19x9.5F 19x10.5R w/ 265x35F & 305x30R, Hotchkis Sways, BC (BR) Racing Coilovers (Car Sold)

Buddy Revell

Considering how well the older VQ engines with aftermarket exhaust responded to centrifugal sc's at the top end, the stock system is most likely hurting peak power a lot.

LiquidZ

I don't know how much compressor maps will tell us, but maybe with the information given we can determine the mass flowrate of the supercharger in this application and see how its lining up with the known pressure ratio?

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shumby

yes good info in the wrong thread. get a clue guys

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Originally Posted by SAM@GTM
Engine detonation is not normal and it should never never happen, and whoever told that need to do something else for living .
Sam

Buddy Revell

Nah, I don't see a problem with those guys discussing this. It's interesting info, related to the topic of GTM's SC, and being discussed reasonably (no bashing, name-calling, etc).

RCZ

Could you point me to where you saw that thread Silo? I'd like to read more on the subject.

If it is a matter of intake charge density and backpressure, then that makes sense. I'm glad I learned something today. So there must be a sweet spot for volumetric efficiency that will squeeze the absolute most out of a turbo.

Silo

Here you go: Why bigger turbos make more HP at the same PSI.... - Page 3 - RX7Club.com

Silo

And the parasitic loses of a s/c are always way higher then the losses due to backpressure increase by a turbo. Don't forget that otherwise wasted engery (in form of heat) is used to drive the turbo. The overall efficiency of a turbo is higher than that of a s/c which doesnt mean that I would roule out a s/c - I even prefer it since you can reach a certain amount of gain with less cost and less labour and with less parts (less parts = less possible source of trouble).,

Having said that, a birdy told me there will be a press release later today...