GTM Performance Engineering: Stage 1 Supercharger Upgrade Kit 500whp capable
 

We here at GTM are thoroughly excited to share the results of the Stage 1 Supercharger Upgrade kit. We tirelessly push the envelope and we're never satisfied!

For those of you not familiar with this upgrade kit, it effectively uses the intake system and supercharger compressor housing of our Stage 2 Supercharger kit to help the Stage 1 Supercharger breathe better. And oh, does it ever breathe!

Below is the list of all the parts that comes in this upgrade :

GTM SC Compressor housing C38-81 V band type
GTM SC Pulley 92mm
GTM Power St Fitting
GTM Power St Hose
GTM Breather Filter
GTM Urethane Eng Mount
GTM 3" MAF Piping
GTM 3" Inlet Intake
GTM 4.5" Intake Filter
GTM Transition Couplers
GTM T-Bolt 3" V-band Clamp
GTM SC Belt
GTM Base ECU Map

Depending on Pulley size, We recommend the following :

Bosch EV14 650cc injector upgrade
GTM Fuel Pump Voltage Stabilizer kit
Custom Dyno Tuning

With these breathing parts added to the C38-81 supercharger in our Stage 1 kit, we were able to squeeze every last drop of horsepower out of that blower. More, in fact, than anyone gave this blower credit for.

Below is the dyno graph. The BLUE lines are a bone stock 2011 Nismo 370Z.

The RED lines are the same car with our Stage 1 S/C and upgrade kit, 10psi of boost, test pipes, and HKS Cat-back Exhaust on 91 octane pump gas.

The GREEN Lines are the same mods except a smaller pulley, 11psi of boost on 93 octane gas.


For people that don't have our Supercharger yet and want this kind of performance out of the box, we'll be offering a Stage 1.5 Supercharger Kit so you can have great performance with a good price point.

Sam you weren't kidding that is very impressive.:tup:

I will call you Monday to talk to you about the upgrade.


Thanks Frank

P.S. email me stage 1 instructions I already have stage 2.

Where's theDreamer? Matt come get one of these!

Very nicely done :tup:

What's the price point of the 1.5?

(price of stage 1 + price of stage 2)/2 ?????

haha i really wouldnt be surprised if that was close but idk

Hahaha

damn that is some really good output to get out of a clean fit supercharger kit.

well done.

On the Website it's about $1300 for the upgrade with one engine mount and about $1500 with both mounts. Not too bad IMO, might be ordering this in the coming months...

For the upgrade kit, it is $1,326.53 Here's the link: GTM Motorsports*::*FORCED INDUCTION*::*GTM STAGE ONE SUPERCHARGER COMPRESSOR HOUSING/INTAKE UPGRADE

For the Stage 1.5 Supercharger Turn-Key kit, it is $7,172.00 Here's the link to that: GTM Motorsports*::*FORCED INDUCTION*::*GTM 370Z 550HP STG1.5 SUPERCHARGER (TURN KEY) KIT

At what point is the fuel pump votage stabilizer needed? Just when upgraded fuel pump and injectors? And what flaws lie in the stock system that this is needed?

Thank you! I'm happy we were able to pull this off and really show just how impressive the Rotrex units really are. Of all the supercharger units we've ever worked with, Rotrex makes the best ones, hands down. I'm really surprised that they have such low market penetration here in the US. It seems people in general are very resistant to progress and technological advances. Too bad, really...they're missing out. lol

When we were developing the Stage 2 Supercharger kit, we found that air/fuel ratios were not being consistent. This was very strange because we hadn't run into that problem on our Twin Turbo kits on the 370Z or any of the earlier VQ cars we have Forced Induction Systems for.

We did a lot of digging, data logging and testing to find the root cause of the issue. You see, on the 370Z, Nissan changed the wiring to the factory fuel pump wiring harness. On the stock fuel pump it's no big deal and in fact the older Z's and G's were a bit overkill on the wiring side of things. What we discovered, was that voltage was dropping when the fuel pump was working the hardest and drawing the most power. We developed our Fuel Pump Voltage Stabilizer to make sure that the fuel pump gets the voltage it needs to operate properly all the time without having any fuel delivery issues.

It has been alluded to in the past as to why this isn't an issue on the twin turbo cars before, but I'll go over it again just briefly here. Twin Turbos do not consume horsepower in order to produce positive manifold pressure the same way that a supercharger does. That means that in order to get XXXwhp from a supercharger, you need XXX + the amount of power the charger consumes. As such, there is significantly more fuel demand on a supercharged car at peak power than the equivalent power turbocharged car.

Now, you asked "at what point" it is required. The answer is "it depends". On our supercharger kits, if you are going for 480+whp, it's a good idea. There may be cars that have a lower threshold than that, and there may be cars that can tolerate more power. There's a lot of variables involved, but we take the stance of "better safe than sorry" with this and include it as part of our Stage 2 Supercharger kit and highly recommend it with the Stage 1.5 system. It is also available on its own for those that purchased systems from other companies that don't take things quite as seriously as we do. Remember, we don't just make a kit, we engineer the whole shebang to make sure that no matter what power or performance you are after, you have the products available to have everything mesh together cohesively. ;)

wow, great results, can't believe it did that well

Very interesting read. Nice to see you guys take it to the next step. GTM is truly innovators in this business. Thanks.

You know what I'm going to tell Sam on Monday don't you.:excited:

Thanks! In case you didn't know, we pretty much started in the VQ scene by developing fixes/improvements on other company's products. For example, the HKS Supercharger Kit for the 350Z out of the box only made 60rwhp more than stock. After we worked it over, we were able to get 140rwhp over stock...more than twice what the HKS was ever thought to be capable of.

Speaking of the next level, take a look at Sam's avatar...we'll be talking more about that here shortly. ;)

I know. I know. Your hooked.
No doubt you have. Can't wait till my day of FI.

I wondered about his avatar pic. I already have two good ideas of what it is.

Will fast intentions LTH's fit with the 1.5 kit?

Wow -- interesting finding. Well done -- that's just the sort of quirky problem that would throw a lot of people off :tup:

Excellent work GTM. Sam, your a rock star.

Doubtful... it looks like the stage 1 will be using the same compressor housing as the stage 2 with the same size inlet, 4.5 inches.

Pretty disappointing, but the numbers look good

It males more rwhp than a stage 2 ?

Surprised more of you didn't comment on this remark.

I was about to lol. I want to know what it is!

No, But this one will, We did this just for you;)

http://www.the370z.com/forced-induct...er-system.html

Sam

This will max out the stage 1 C38-81, The stage 2 can go much further .

Sam

Thanks for explaining this.

Holy crap, in for results on this one :)

First off: congratulations to GTM for continually giving us great new options. I do have some questions though.

EDIT: My questions were answered after I figured out that I misread the graph, which is comparing two different STG 1.5 setups. GTM, it's easier for us speed readers if you call it STG 1.5, rather than STG 1 with upgrade.

Again, congrats on the achievement!

^ the red line is the stage1 with the upgrade (1.5) on 91 oct and the blue is the same with 93 oct and a smaller pulley.

It would be cool to see the dyno for stage 1 and then the stage 1 upgrade on the same car and the difference.

Indeed. I went back and noticed I had misread. I thought that the red line was stage 1 and I was thinking, that's way off. Thanks :tiphat:

I had to reread it too. I thought the same as you at first glance.

Has anyone on the forum here done this upgrade? I want to do this so bad.

I get my kit next week:tup:

^ yep I saw that.. congrats man. But honestly was wondering who currently has the stage1 installed (like me) and have gone thru the upgrade. just a curious bastard thats all.. :)

It's going to cost allot b/c stage 1.5 is stage 2 with the stage 1 blower so everything that stage 2 has that you don't,I guess you could leave some parts off the list to avoid a high bill.

?? unless I'm reading it wrong, its like ~1300 for the upgrade, a little more for the bigger injectors and fuel pump voltage stabilizer.. That's not a bad price for an additional 100whp for the stage1 guys.

I'm in for the results on this upgrade... I am definitely interested in doing it, if you really get 100 whp, the price is a good deal. Does anyone have any idea approximately how much labor it is to install?

To Baer383... This kit will make the Stage 1 even "sneakier"