Firstly let me just say that from what I have seen on here for the past 18 months, I'm a big fan of GTM. Just 2 questions out of curiosity
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03-07-2011, 02:28 PM | #1 (permalink) |
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GTM 370z supercharger 550bhp/400 ft of Torque: The Masterpiece
Firstly let me just say that from what I have seen on here for the past 18 months, I'm a big fan of GTM.
Just 2 questions out of curiosity in relation to the car in these videos. 1. Why was there no build thread for this car? 2. Why have these figures not been repeated on other stage 1 builds? YouTube - GTM 370Z SUPERCHARGER 550BHP/400 FT OF TORQUE 460 RWHP 360 RWTQ.THE MASTERPIECE YouTube - GTM 370Z SUPERCHARGER STG1 8PSI 550BHP/400 FT OF TORQUE 460 RWHP 360 RWTQ. TEST DRIVE |
03-07-2011, 02:59 PM | #2 (permalink) |
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I would be happy to address your questions.
1) There is in fact a build thread for that exact car: GTM Performance Engineering 370Z SUPERCHARGER KIT PRESS RELEASE 2) This was part of the R&D process. Those numbers were made with a one-off race intake, GTM 2.5" cat-back exhaust and STOCK CATS. It is also an extremely aggressive tune on 93 octane gas. Mainly this was to demonstrate the supercharger's capability. Our off the shelf tune is conservative to ensure that everyone that buys and installs it will be able to achieve the advertised 500bhp (or very close to it depending on many variables) without undue risk to their engines. The other main reason why we are showing such a graph is because we were able to achieve those numbers with this supercharger unit. Also, this is a strong validation that the supercharger unit is capable of more power with a better tuned VVEL tuning solution. Here is the same supercharger unit making 490whp on a 350Z (VQ35HR with tuned dual CVVT) with 100 octane gas: This shows very clearly how VVEL adversely affects power output with a supercharger. I cannot overstate that enough. Again, we were able to make 460whp on the 370Z with STOCK CATS. The reason for that is because, quite simply, the back pressure generated by the stock cats keeps air from blowing through the engine. This means more air stays in the cylinder to be combusted. Once we are able to tune VVEL, we will be able to reduce the overlap and thus make more power on supercharged cars. |
03-07-2011, 06:49 PM | #5 (permalink) | |
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How is the progress coming on this project? Any updates?
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03-13-2011, 04:00 PM | #6 (permalink) | |
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Sam |
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03-13-2011, 04:19 PM | #7 (permalink) |
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Any estimate on a release date for stage II?
I've got the money just burning a hole in my pocket!!
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2012 G37S Sedan 6MT - Project Practicality 2009-6MT-Sport/Touring-Dembflyr's Journal-TT Build Thread-CAR IS SOLD |
03-13-2011, 04:43 PM | #8 (permalink) | |
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Sam |
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03-13-2011, 04:52 PM | #9 (permalink) | |
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I have no doubt that you are going to make sure it is the best it can be. I wouldn't want it any other way. Once it is released, how long will it take to ship from when the order is placed?
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2012 G37S Sedan 6MT - Project Practicality 2009-6MT-Sport/Touring-Dembflyr's Journal-TT Build Thread-CAR IS SOLD |
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03-13-2011, 05:24 PM | #10 (permalink) | |
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Sam Last edited by SAM@GTM; 03-14-2011 at 01:21 AM. |
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03-14-2011, 09:15 AM | #13 (permalink) |
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Waiting for the stage 2. " by the end of the month ?" Thats the best news i have heard yet. Can not wait to take it down the 1/4 mile.
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03-14-2011, 09:06 PM | #14 (permalink) |
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Can someone with engineering knowledge give a layman's explanation of how the VVEL hinders the power output and how "tuning" it will benefit both NA and SC cars? I have a vague understanding of it but I know VVEL tuning and "cracking" the ecu has been a hot topic
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03-15-2011, 01:26 AM | #15 (permalink) | |
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The VVEL system in our cars and extremely aggressive at about a 300 cam duration; Valve Overlap "The portion of the operating cycle of a reciprocating engine in which, when the piston is passing TDC (top dead center) on the exhaust stroke, both the intake and exhaust valves are open. Valve overlap increases the efficiency of the engine operation by allowing the low pressure caused by the exhaust gases leaving the cylinder to help the fresh charge of fuel-air mixture in the induction system to start moving into the engine." When you're pushing so much air into a car (forced induction) with an aggressive cam - there's air that isn't going to be used and is just going to pushed out of the motor and wasted because both the intake / exhaust valves are open at the same-time. Drop the cam duration, you'll have more time between the valve overlap process so when the air enters the head it will give the bottom end enough time to use that air for the combustion process, building more psi, creating more power. Let me know if there's anything I'm incorrect about, but that's what I've gathered.
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