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GTM Performance Engineering stage 2 600hp supercharger kits line-up press release

Apparently mine ships today... Terrific press release, Sam!

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Old 09-13-2011, 11:42 AM   #76 (permalink)
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Apparently mine ships today...

Terrific press release, Sam!
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Old 09-13-2011, 11:46 AM   #77 (permalink)
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Quote:
Originally Posted by Reality View Post
BHP?
Please don't reply, until you get a clue..
Horsepower - Wikipedia, the free encyclopedia
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Old 09-13-2011, 11:54 AM   #78 (permalink)
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Quote:
Originally Posted by Reality View Post
BHP?
Please don't reply, until you get a clue..
Please stop posting before you make a bigger *** out of yourself
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Old 09-13-2011, 11:57 AM   #79 (permalink)
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Originally Posted by GUTCH View Post
There is no Stage III from what I've read.
Just assuming if there was that would be the only way to get to 600 Whp out of the box.
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Old 09-13-2011, 12:03 PM   #80 (permalink)
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Correct me if I'm wrong...

GTM's TT press releases on here were originally in WHP. At the time their website also rated the TT kits in WHP.

The SC kits were always referred to in BHP, the website reflects this.

Now the website also shows the TT kits in BHP.

Hope that helps.
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Old 09-13-2011, 12:41 PM   #81 (permalink)
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I'm pretty sure the HP numbers here are not BHP, WHP or FWHP. They are more inline with the theoretical compressor capacity which can translate to HP. Which is not a bad way to rate a kit given that cars and condition can vary vastly, hence the reason why GTM listed a few different installation setups in their PR to give a taste of what it is capable of.

Looking at their prior StageI press release and the independent installations of it, I don't see any reasons to doubt their ratings.
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Old 09-13-2011, 12:50 PM   #82 (permalink)
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pardon me if this is a dumb question.... but going FI, whether it be stage 0, 1, or 2, on stock internals, tranny would undoubtedly shorten those parts' useable life right? Don't me wrong, I would LOVE to do this... LOVE it... but am just worried of how my engine (amongst other parts) will handle it. I'm sure it can handle it, but question is, for HOW LONG before something breaks???
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Old 09-13-2011, 12:59 PM   #83 (permalink)
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pardon me if this is a dumb question.... but going FI, whether it be stage 0, 1, or 2, on stock internals, tranny would undoubtedly shorten those parts' useable life right? Don't me wrong, I would LOVE to do this... LOVE it... but am just worried of how my engine (amongst other parts) will handle it. I'm sure it can handle it, but question is, for HOW LONG before something breaks???


I think most guys will say it does have the potenial to shorten the life of the motor, but if the car is maintained well and has been tuned properly it will last a long time. I saw on the forum there was one guy with over 6k on his TT setup. I know thats not alot but its progress. Nowbody will know until stuff starts blowing up (or hopefully wont blow)
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Old 09-13-2011, 01:04 PM   #84 (permalink)
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Originally Posted by FromG2Z View Post
pardon me if this is a dumb question.... but going FI, whether it be stage 0, 1, or 2, on stock internals, tranny would undoubtedly shorten those parts' useable life right? Don't me wrong, I would LOVE to do this... LOVE it... but am just worried of how my engine (amongst other parts) will handle it. I'm sure it can handle it, but question is, for HOW LONG before something breaks???
This has been asked and GTM responded to this in the prior thread about this kit. Hope this helps. GTM Stage 2 Supercharger Preliminary Testing Results
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Old 09-13-2011, 01:07 PM   #85 (permalink)
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Originally Posted by GUTCH View Post
Correct me if I'm wrong...

GTM's TT press releases on here were originally in WHP. At the time their website also rated the TT kits in WHP.

The SC kits were always referred to in BHP, the website reflects this.

Now the website also shows the TT kits in BHP.

Hope that helps.

The rating of the horsepower output of our force induction systems whether a twin turbo or the supercharger set up is always in BHP (brake horsepower ) just like how Nissan rates the car on their web site, the 370z VQ3VHR engine is rated @ 333 HP . The reason why we rate it in hp, is that there are too many variables involved in wheel horsepower numbers: temperature, elevation, gas quality, dyno type (and dyno setup), and the car itself. Even on our turbo kits, the numbers you are seeing came from Garret web site turbo HP rating per their turbo compressor maps.

Hope this help

Sam
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Old 09-13-2011, 01:14 PM   #86 (permalink)
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Sam,

Can the stage 2 kit be used, effectively and reliably, on a car with OUT the radiator upgrade? (I realize that "yes but the radiator is better", thats not what im looking for.) For a pleasure car that sees an occasional autocross, highway pull, or run through the mountains (US 129 "Dragon", etc).

Also, I don't see a price for the radiator upgrade?

Does the dual oil cooler kit work for the S/C and the engine oil?

Last question, with all these additional coolers is it required to cut holes in the front bumper (like the yellow car) to get enough airflow to the coolers? I'm not seeing how there is enough room near the radiator for an intercooler + 2 oil coolers.
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Old 09-13-2011, 01:29 PM   #87 (permalink)
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Originally Posted by DarkZide View Post
Sam,

Can the stage 2 kit be used, effectively and reliably, on a car with OUT the radiator upgrade? (I realize that "yes but the radiator is better", thats not what im looking for.) For a pleasure car that sees an occasional autocross, highway pull, or run through the mountains (US 129 "Dragon", etc).

Also, I don't see a price for the radiator upgrade?

Does the dual oil cooler kit work for the S/C and the engine oil?

Last question, with all these additional coolers is it required to cut holes in the front bumper (like the yellow car) to get enough airflow to the coolers? I'm not seeing how there is enough room near the radiator for an intercooler + 2 oil coolers.
Yes it can, Note that every car we have done an inhouse install on , did not have a radiator. And all of them are running without any issues, is it a good idea to have ... yes but not a must have item.

Different story when it comes to A/T trans oil cooling, You must have cooler to protect you Transmission, There is no option there. otherwise you will be buying a new trans in no time .

The competition radiator /duel oil cooler set up will work with both SC and TT applications . Will have some pics very soon

Sam
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Old 09-13-2011, 01:32 PM   #88 (permalink)
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Quote:
Originally Posted by gabe3d View Post
This has been asked and GTM responded to this in the prior thread about this kit. Hope this helps. GTM Stage 2 Supercharger Preliminary Testing Results
Thank you Gabe

Quote:
Originally Posted by SAM@GTM View Post
The answer is: Nobody can determine what is "safe" vs. "unsafe" horsepower or boost for the motor. The real risk factor is always there. It can be minimized, but never eliminated.

There are two risk factors that we have to look at. First one is the compressive strength of the rod once fatigued, which we don't know simply due to the shear number of cycles a rod sees (the rod would have to sit in a fatigue testing cell for a couple years 24/7 to come close to modeling the cycles a rod sees in real life). The only thing we can do is base it on real life experience. This means how many engines have snapped a rod due to installing forced induction.

Back in the days of the 350Z, this answer was simple: 400whp was the limit...anything more, and you would need a built motor. Another thing I'd like to throw in there (I will cover in more detail later) is that it has been established is that supercharger cars had a longer life expectancy at higher power levels than twin turbocharged cars. The reason is simple: turbo cars make more torque and do so abruptly thus shock loading the rods and snapping them like so many toothpicks. Fast forward to the VQ37VHR. We noticed that the rods are beefier and it's almost as if Nissan was compensating for the more powerful higher reving engine. Here is a pic below showing the transition from the VQ35DE to the VQ35HR to the VQ37VHR.



Arguably, we have installed more forced induction kits on the VQ HR and VHR motor than anyone in the world. So far, these engines have shown a great track record. I think the reason for this success is a combination of a few things that have been improved over the older DE engine.

1) Better Internal Engine Components
2) More stable Main bearing caps
3) Better Combustion chamber design
4) Better cooling system design (cylinder heads are the first to be cooled down vs. the old DE engine which had the block being cooled first)
5) Better Head Bolts
6) Better Dynamic Timing Control

Finally and most importantly is TUNING. This is the key ingredient to maximizing the longevity of a forced induction build on a stock engine. Tuning is an art as well as a science and requires intimate knowledge of the components of an engine management system and how they all relate to each other. For example, the Nissan ECU has a Temperature Compensation table to alter the Ignition Timing Table based on what the MAF sensor sees. So, if the MAF sensor sees cold air, the ECU will advance the timing. We located the MAF sensors where we did for precisely this reason, so that we can give the ECU a real time indication of how hot or cold the air entering the combustion chamber really is. This is a critical part of saving the engine. We all know that when supercharging, our biggest challenge is IAT (Intake Air Temperature). Since the supercharger is a compressor, the air is heated up substantially and it is important to have the proper ignition timing for hot air/fuel mixtures. Here's a sample of how a Temperature Compensation Table is supposed to look (note that the hotter the air gets, the more timing gets pulled):





Another thing to keep in mind when it comes to these engines, is that although it is an 11:1 compression...that's static compression. Dynamic compression takes into account volumetric efficiency, so that means that the effective compression ratio changes throughout the power band. I can tell you from experience that there is no way in hell that we could run the timing table we use on the VQ37VHR on an earlier VQ motor.

That all said, I want to give you a visual guide to torque curves to help you all understand why you can have more horsepower on a supercharged car than you can on a turbocharged car. The graphs below show different twin turbo setups compared to the 523hp supercharged setup. Pay special attention to the peak torque and how hard torque comes on. Understand that peak torque represents peak cylinder pressures. So the less peak torque you have, the less peak cylinder pressures your engine is seeing and the less stress there is on the motor overall. Although the supercharger engine has to work harder to make the same peak power as the twin turbo car, is still has less internal stress as the torque grows in a linear fashion.






If you ask me what is the single most important thing that anyone can do to keep their forced induction system running as long as possible without building their engine, is to focus on the tuning aspect of the build and eliminate any detonation. Detonation is an uncontrolled explosion rather than smooth expansion of burning gas. Eventually, detonation will beat up the engine bearings, leading to excessive clearance and spun bearings. Even if the rod or piston doesn't break, you will still have premature engine failure.

In closing, the things to watch out for are as follows:

Peak Torque
Detonation
Air Intake Temperature Compensation
Fuel Quality

IMO a well tuned 500 RWHP has a lot better chance surviving then a 400RWHP that is not tuned correctly

Sam
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Old 09-13-2011, 01:34 PM   #89 (permalink)
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thanks sam
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Old 09-13-2011, 02:09 PM   #90 (permalink)
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thanks for input Sam/others. Good to learn.
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