Kwame

iTrader: (78)

FYI...

To Injected Performance:

Is this the final tune for this car, or have you guys not yet reached your power goals?

paranormal

iTrader: (1)

ahh i see.

i guess im getting majik invisible cam's in my car then

foget it. im wrong im sorry back on topic! i dont want to start anything in IP's thread.

GurgenPB

iTrader: (2)

I know what you are saying...

Let me reserve my judgement until I see a proper rpm plot.

I am not sure why the TC would cause such a drop in power at the top end. The faster the TC spins hte lower its STR (torque multiplication) and the higher it's power transmission though the liquid medium (AT fluid). TC sslip is really almost always an issue on the low end, when there is a large differential between the impeller and wheel/tranny side of torque converter.

As far as the hot-side of the turbo is concerned...this is why I was asking about the A/R....that would generally asnwer the question. Again, we need to see the rpm plot to be sure of the flow characteristics.

As far the compressor map is concerned, that is a direct indication of the flow as a function of the shaft/impeller speed. So, once the shaft spins up, that will bring the compressor flow diagram into perspective, as that will allow you to see what the boost is. This is generally a very efficient turbine, as is the case is with MOST if not all large frame turbos...79% peak efficiency is pretty good... and is harder to attain with smaller turbos. The only one that does is the PE1420 that has 79% efficiency at low flow levels, thanks to its dual impeller design. Others peak out at 74-76%.

So, this GT4718 turbo would get into it's higher efficiency range at 10-11K rpm, as you can see from the plot. And this plot is VERY accurate, more so it's customized for their elevation, temperature, VE, and no pressure drop (in the last two cases I put in optimistic values so that it would help the graph looked better than it would if the VE were lower, etc). If you are NOT gonna spin the engine that high, which is the case with the VQ35, and you are gonna attain higher flow on the count of higher boost (as the rpm lines move further to the right with higher boost), then you need to pick a smaller compressor and a higher A/R housign to account for the higher flow at higher boost levels. This scenario would only penalize the spool up time (slower), but once it IS spooled up to boost, the comrpessor would indeed be at a higher efficiency... and THAT's exactly what I am talking about. This is what constitutes good turbo sizing R&D.

GTM

iTrader: (12)

First off, Congrats to Gregg and everyone at Injected Perfromance this is awesome power and that looks like one sick drag car! I love the skinnies in the front on the dyno

Just would like to clear a few things up regarding what paranormal said. I believe what he meant (and I could be wrong) is that all the parts used on our car are OFF THE SHELF parts, nothing custom that needs to be specifically fabricated for every customers cars.

Our REVUP cams are in stock and have already been installed in a few of our customer's cars.

For fuel system the APS Extreme fuel system will do just fine, the CJM Stage 3 will be out very soon. (both are off the shelf parts you can purchase)

Our Exedy GTM Spec Triple Sisc clutch was installed in this car to test it, our twin disc will (and did) hold up just fine. Not to mention this really doesn't have to do with the engine since there are many clutch choices available.

We have already duplicated our setup on another members car (Nitrouz) and his car was equipped with the GTM Twin Disk Exedy clutch and APS Extreme fuel system.

Anyways point is that we build street cars and all the parts we use are readily available and can be done by anyone who has the desire to do it. There will be a few more setups similar to our 855rwhp street Z rolling out of the shop in the next few months....

Sorry for the OT, just needed to clarify that. Now post up those graphs with TQ, and RPMS Gregg!

-George
GT Motorsports

Kwame

iTrader: (78)

I am sure if there is enough demand and the market is truly there, Injected or someone else might consider making a single turbo kit with these capabilities for the general public. Truthfully, I don't think there are even ten people on this board who would actually pony up to purchase a kit of this magnitude.

GTM

iTrader: (12)

I agree I doubt there are even 10 people on these boards that would take their car to this level. Most board members use their cars as a daily driver/weekend car/show car. Not many hard-core drag only racers that trailer their cars to the track.

But I could be wrong!

-George
GT Motorsports

SirSpeedyZ

iTrader: (10)

very nice

InjectedPerf

iTrader: (15)

Thanks to everyone that has congratulated us. I know there are will always be skeptics. We built the car to see if we could push the limits of the VQ and I believe that some of the off the shelf parts are not able to make the power we wanted to. I would say that GTM has pushed the limits of the APS Extreme Fuel System and APS Extreme Turbo System. We have always done stuff a little different, first with the single turbo GT42 2 years ago and now with the single turbo GT47. Don't get me wrong, this is our drag car.

You might see this motor or one like it in my 06' street driven 350z with a pair of turbos, our twin pump return fuel system (that was developed along with our GT42 turbo) and a six speed transmission or in a G35. Who knows. We were able to find out what the Brian Crower Stroker Kit and L19 studs can handle. So far everything looks really good. We will not stop here, just need to focus on some customer's cars, other project cars, and of course the Haltech Platinum PnP system. More to be released this week. We didn't make it to the track on Friday due to the driveshaft Driveshaftshop.com supplied to us was larger than the driveshaft loop we had ready to install. Our local metal store was already closed and I won't take a car to the track without the safety loop. I have broken too many driveshafts back in the Supra days. Larry knows all about that

Thanks again,

Greg

majik16106

[QUOTE=paranormal]i guess im getting majik invisible cam's in my car then QUOTE]


I have cams?

Bullitproof

iTrader: (3)

Can you give out any info on your twin pump fuel system? i feel i speak for a lot of board members in saying that we are waiting for a viable kit to hit the market besides the APS extreme kit and the AAM maxflo pump upgrade.

wayneside

iTrader: (22)

greg - awesome man!

centxdsm

On the converter issue, I have seen ls1 dyno graphs where the point where the converter flashes is late enough to inflate peak power which could be the case here. Then, the power would fall back to its "normal" level and the high end decline would be caused by some of this. The graph doesn't look that way to me though, but it would explain the drastic drop in whp. I would like to see an rpm plot as well. I was reading the the BC kit uses an 88 mm stroke and 100mm bore. If that is the case then the motor sure has a lot of rev potential even with the large displcement.
I too don't want to come off as too negative/skeptical, but a 300whp drop from peak to redline raises one's brow.

Joeschmoe

I'm not taking anything away from your guys accomplishments but with an unlocked converter this is a prime example of what can happen. And especially, if you are familiar with Supra's then you'll know that 27 PSI on a GT4788 will not put you anywhere near 1000whp .

It's great that you guys are getting there, and I am curious as to how it performs on the track, which is where it counts anyways. Where all correction factors, misreadings, etc are put aside. Anyways crank up the boost.

Alberto

iTrader: (14)

That is insane, Id love to feel what that feels like from a dig with traction...

IIQuickSilverII

iTrader: (13)

+1 on cranking up the boost more and see where it can go

more displacement should help on the vq vs the 2jz... the heads flow better ...intake manifold needs work.. ia m sure there is something else also though...

Joeschmoe

A GT47 will not be highlighted for its accomplishments in the mid range of a VQ35. There's no reason why with this turbo, that you're not trying to find ways to increase the rev limit in order to yield the full potential of the turbo. It should continually / drastically gain power all the way to redline.

SnakeBitten

iTrader: (8)

Yeah maybe on a Supra but this aint a Supra....Its a 4.2l V6 with better flowing heads etc.....Not a guru by any stretch but just seems like comparing a 2jz output to an engine thats a good bit bigger and has better flowing heads is not apples and oranges...

taurran

iTrader: (18)

Quick question-

Are you running the HKS headgaskets on this car? Any other head gasket/stud/strengthening modifications other than the L19's and the gaskets?

InjectedPerf

iTrader: (15)

100mm Cosworth headgasket
Stock size L19 head studs
Injected Performance billet main girdle

JuanFunction2ND

iTrader: (1)

awsome #'s congrats