So is the vent return just for noise reasons?

You mentioned you have test cars at the shop. Do you have a S/C and TT test car? I would love to get a feel for these both as I am trying to decide what car to get this spring and a GTM'ed 370Z is in a dead-heat with an EVO X.

just let it go man...all the minor issues have been fixed including the fluttering..this system is rock solid!!..also keep in mind that this car was tuned on cali 91oct and has neg camber -2.4 in the rear...many of you have access to 93 which should result in higher numbers...i believe Sam's claim is spot on!

quit hating...nobody wants to hear it anymore.

Yea sam is the man. The kit is awsome. IDK about the car though, looks like the owner could have taken better care of it;) J/P
Frank

lol i know the owner of that car and yeah he's one SOB!haha:p

is there an oil cooler fitted on this car? is the oil cooler placed behind the intercooler just like the TT set up?

why kevin...are you getting one....

Yes the car is getting on oil cooler but it will not be placed behind the intercooler, will have some pics shortly.

Sam

epic

Damn. Just when I thought I'd finally made my mind up to go TT.

Oh well. That's a good problem to have I guess.

This is looking so good ...

I think tomorrow I will go dyno my car. I have yet to do that since Sam sent me my new tune a while back. I am interested to see what it does.
Frank

Awesome results! Glad to hear the fluttering has been resolved. I'm real close to putting money down on this kit...

^^dooo it..you wont be disappointed.

I wanted TT from GTM, but now... looks very attractive

you are correct.

Yeah I'm about to be getting back home from a work assignment in Europe. There's a chance I'll have to go back for a few more months so I need to see how that pans out first.

It could be arranged we just need to know ahead of time. This guy here got lucky and we were able to accomdate him when he stopped by .

:excited::excited::excited:

Damn Sam, i think you just made my mind up for me! Great work and congratz to the op. Ill be in contact next month or so sam :tup:

The credit really goes to the whole team at GTM. We all work very hard to deliver the best possible product. All the way from our parts department to our research, development, and design department, to our tech support department to tuning department.

This is a concerted effort between many people with various skills to make this whole thing possible. We would also like to thank our loyal customers who have helped us with their feedback to further refine our products to deliver the absolute best that money can buy.

So congratulations to everyone for making the GTM Supercharger Kit #1!!!

:happydance:

The hard work pays off eh? The proof is always in the pudding!

David,

Thank you for posting this information up and being part of the solution. ;)

I'd just like to make some comments on your graphs. Your power and torque look outstanding, but the afr looks odd. The target afr is to be 11.8 on average from the point the car goes into open loop. I did notice on your graphs the afr on each run got progressively worse toward the top end. Usually that is an indication that the exhaust sniffer coming off the tailpipe was being pushed backwards. It is very difficult to secure the sniffer in the factory tip. Ideally, it is best to collect afr data right before the cat. Collecting after the cat is ok, so long as you realize that it will read leaner than it actually is. Based on the logs I have from you from the factory widebands right before the cats, the afr was on target (11.8) all the way to redline, which is exactly where we want it to be.

It has been our experience as well that the bends right before the tip on the factory muffler significantly throw off the readings at higher power levels.

At stock power levels, the exhaust gas velocity is low enough to make the turn and still flow somewhat evenly (at least unnoticed by the sniffer). However, as exhaust gas velocity increases at higher horsepower levels, the exhaust gas has more momentum and therefore, doesn't flow through the bend evenly. Therefore, at higher power levels, the sniffer is reading a small quantity of fresh air that fills the low pressure zone created on the inside of the bend between each pulse of exhaust gas.

We've tuned hundreds of Z's and witnessed this phenomenon, time and again.

Here are some visual aids to help you guys understand what we're saying here:

hey sam on a car with after market exhaust and test pipes is it ok to go from the tail exhaust then or will that also cause to have a lean apearance. Also I would imagine that the 11.8 is the same for both TT and S/C cars. So at what point does the AFR start to become not so optimal to you guys? Finnal question when running data logs I know you mentioned before that they tend to read a little higher then what it really is, so does the little higher varry between each car or is there a set formula you guys use once you get the afr off the ECU. Sorry for all the questions but found this to be a great opertunity to educate my self. Thanks
Frank

Awesome clarification Sam. I would like to thank the whole team at GTM for a wonderful job and the wonderful product I have. I have to recommend to anybody the customer support is awesome. If I ever had a question, they were there to answer it. A good product is nothing without customer support and this company has both!

This news definitely made my day, VVEL has greatly limited tuning and I'm blown away by this news. My only question/concern is that will it be via uprev or will those already with uprev be forced to opt for a completely new possibly standalone setup. While I want vvel cracked standalone engine management is $$$$.

11:8.1 on FI... these motors love the leaner side, wonder how they would look in SC or TT with E85 12:5.1 few more degrees of timing across the board, the extra TRQ would beery nice on top of an already great graph for both offerings.

Yes it is, Ultimately the closer you are to the engine the more accurate samples you will get. with having test pipes in place taking samples out of the tail pipe will be good enough.

Ideally 11.5 to 11.8 is the desirable AFR ration for forced induction, different fuel will require leaner AFR like C16 race gas.

Sam

We are glad that we have met your expectations :tup:.

Sam

Ok so what would be acceptable reading from lets say the Blitz guage unit that reads afr from the ECU for the OBDII port? Just wondering this since I plan on getting it after christmass.
Frank

Yes they do, The VQ37VHR head combustion design has a lot to do with it. You could never run the same timing tables form the VHR on the DE engine not in million year .

Sam

The blitz AFR voltage conversion tables are a little more accurate then the Osiris tables so i would say 10.8 to 11.5 would be spot on .


Sam

Awsome that is great info to know. Thank you for the education in that area. its nice to have guages but completely useless if you don't know how to read them to know what the thresh hold is.
Frank

not yet bro, I'm waiting for your used one :icon17:

No it is not via the Uprev and it may never be sense even Nissan does not control the VVEL via the ecu, it has its separate stand alone controller to do that, Our short term goal is to have full control over the engine and to do so we will be utilizing an external software and hardware to control the the cam phasing and the VVEL separately. keep in mind that having more control is not always better, More control does become more beneficial for complex modifications like supercharging an engine witch such high VE like the VQ37VHR but you may never be able to out do the factory valve timing for a stock engine set up.

Stay tuned

Sam

weeeeee hehehehehehehehe


I got to get me that BOV ASAP. Sam e-mail sent with the pick up info for the trans. Man theses number look good. A lot of stuff i need to buy now. Cannot wait to get my LTH back on rebuilt trans and the 8 psi pulley and then maybe some VVEL upgrades. man i like toys.



weeeeeeeeeeeeeeeeeeeeeeeehehehehehe

Things are looking good for next year. GTM's stage 2, up rev tuned by Sam and a VVL stand alone. VB. torque convter and a built 7 AT. on 94 0ctane.
Could be big rwhp #'s coming the Z's car in Canada.
Its been a long wait for my stage 2 but hopefully it should be here early next year.
11.7's herewe come in the 1/4 mile.
The waiting is killing me. It is taking for ever, but with 4 to 5 ft of snow up here the car is put away for the winter.

" Shumby my Canadian cousin your car will be slow compared to mine "
you got the first one but i will be geting the faster one .
Canadian dollar almost at par = more GTM toys for the 370z.

Sam, did you check my PM?
Another possible stg2 SC in Canada!

Field Trip to GTM for tours!!! :rock:

What VVEL upgrades are you getting? Did I miss something? Last I checked no one could do anything with VVEL yet and COBB flat out and gave up trying to mess with it.

I already ordered up your TT kit.
;)