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

SPOHN · 02-25-2012, 02:00 PM

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?

Mike@GTM · 02-25-2012, 04:24 PM

Quote:

Originally Posted by SPOHN

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?

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.

Jordo! · 02-25-2012, 06:05 PM

Quote:

Originally Posted by Mike@GTM

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

Seb@SZ · 02-25-2012, 06:14 PM

Excellent work GTM. Sam, your a rock star.

Mkai0 · 02-26-2012, 01:59 AM

Quote:

Originally Posted by Mike@GTM

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.

Thanks for explaining this.

theaudir8fan · 02-25-2012, 04:26 PM

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

SPOHN · 02-25-2012, 04:30 PM

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

Baer383 · 02-25-2012, 04:43 PM

Quote:

Originally Posted by SPOHN

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.

Mike@GTM · 02-25-2012, 04:43 PM

Quote:

Originally Posted by SPOHN

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

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.

SPOHN · 02-25-2012, 04:47 PM

Quote:

Originally Posted by Baer383

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

I know. I know. Your hooked.

Quote:

Originally Posted by Mike@GTM

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.

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.

SPOHN · 02-25-2012, 06:32 PM

Quote:

Originally Posted by Mike@GTM

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

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

NewYorkJon34 · 02-25-2012, 04:50 PM

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

Staples · 02-25-2012, 06:15 PM

Quote:

Originally Posted by NewYorkJon34

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

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.

SAM@GTM · 02-25-2012, 06:53 PM

Quote:

Originally Posted by NewYorkJon34

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

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

GTM Performance Engineering: VQ37VHR Twin Supercharger System

Sam

NewYorkJon34 · 02-26-2012, 09:12 AM

Quote:

Originally Posted by SAM@GTM

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

GTM Performance Engineering: VQ37VHR Twin Supercharger System

Sam

Holy crap, in for results on this one

02-25-2012, 02:00 PM	#1 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 47 Posts: 14,844 Drives: Waiting on next Z Rep Power: 223	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? __________________

02-25-2012, 06:14 PM	#4 (permalink)
Seb@SZ Enthusiast Member Join Date: Jan 2010 Location: Chatsworth Posts: 277 Drives: Zs Rep Power: 26	Excellent work GTM. Sam, your a rock star. __________________ Z Car Specialists www.specialtyz.com Blog http://specialtyz.com/blog/

02-25-2012, 04:26 PM	#6 (permalink)
theaudir8fan Base Member Join Date: Jul 2011 Location: lonely land up north Posts: 162 Drives: 07 Infiniti G35S PG Rep Power: 15	wow, great results, can't believe it did that well __________________ 2007 Infiniti G35S 5AT PG; GTM; KW; Hotchkis; Stillen; Berks; SPC; GT-spec; SxExCx

02-25-2012, 04:30 PM	#7 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 47 Posts: 14,844 Drives: Waiting on next Z Rep Power: 223	Very interesting read. Nice to see you guys take it to the next step. GTM is truly innovators in this business. Thanks. __________________

02-25-2012, 04:50 PM	#12 (permalink)
NewYorkJon34 A True Z Fanatic Join Date: Jun 2009 Location: Naples, Florida Posts: 3,041 Drives: 09 Fairlady Z Rep Power: 1066	Will fast intentions LTH's fit with the 1.5 kit? __________________ NewYorkJon34's Ultimate Z Build

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