There's not a boost reading on the dyno graph, other than what was typed in ("12 psi") and what was written in (19 and 22 psi).

Hey, I just noticed that the dyno sheet says the 19 psi run was done first, then the 22 psi run, then the 12 psi run? That looks odd.

Anyway I wasn't saying that the GT35R makes more power than the GT40R. The 40 is obviously going to flow more. I was just pointing it out.

 

well to be fair
I've seen dynos with high numbers at low boost and those for a large part had high compression rotors....

But I do think these numbers are weak
for all those mods and boost levels
compared to T66, PT67 and T78 numbers

I have smaller S4 ports compared to s6's
a self made ghetto T-66 .81 setup
and at 14PSI I made a tad over 400RWHP


________
11.72@118
on Drag Radials

 

I've seen numerous T78s and T88's tuned by their owners that can't even get over 325RWHP and run like complete dogs. Do i think that's the potenital of these turbos? No....

 

yes but tunning does nothing but extract the power of a particuler setup....Tunning can not make power

If a setup is only good for 300HP.... I don't care if you have GOD himself tunning it...It's only going to make 300HP

I held a GT40 that was custom made by precision
had a .96 Tang housing made for a certain green FD
that has run 9.8-9.9's in the sport rwd NHRA street class
He said he like the quick spool and mid-range
but ran flat at top end
and has switched back to his "special" spec greddy T88

 

I have seen precision 35R's as well and they are nowhere near the same as the ones I buy from Garrett so that means little.

 

I guess it must be poor tuning or intentionally poor tuning since I remembered specifically on that day that the apexi RX6 car made just as much hp as the two cars with the GT40 kit and also the car with the To4E turbo kit car made similar power as well. I'm not knocking on your kit but honestly, I wasn't too impressed with the #'s when I tuned those cars in FL and I thought maybe someone else will come out with better dyno #'s that wasn't tuned by me can proof my theory wrong.

 

We will have to wait and see, in all fairness none of the cars tuned in florida were up to spec, poor or intentionally poor tuning has nothing to do with it, it seems Pettit built the one motor poorly, and pretty much reengineered the whole kit for reasons beyond me, the other car was running a GT4082, neither were running that healthy that day, I have cars tuned here putting out more power on 35R's with practically stock setups so I highly doubt this is indicative of what the kit will do. Which brings us full circle something is more than likely not up to par on Z's car.
The worst part about this whole thread is I'm sure Zach is taking this personally he shouldn't he has one of the nicer FDs out there.

 

"There's not a boost reading on the dyno graph, other than what was typed in ("12 psi") and what was written in (19 and 22 psi).

I guess I am confussed. My last (and only) dyno I did at RR had a boost print out with the dyno graph showing what boost was run. They hooked a line to one of my mani nipples. I did not say to them what my boost guage read?????

 

Added these 3 runs to my dyno comparator at http://www.catenet.net/dyno.php

Regards,
B

 

Some dynos can log boost, but that is usually an option when you purchase one.

Jason

 

Ok, that makes more sense.. I guess I have not been around enough dynos to know that not all had the option to read boost. I would think this is very important when tuning a car that is turbo charged to watch for spikes and such....

 

In regard to the potential of the 40R kit, I will be having Steve tune my car on August 19th...

Assuming the Greddy 3row gets here....

Jason can you pm me about the progress on these it has been well over the 2-3 weeks you quoted me.

Thanks

Edan

 

My car was one of the two in Orlando couple of months back. Actually, the only one with the A-Spec GT40R kit.

Engine definitely had issues with compression - particularly the rear rotor 4.5,5.1,5.2 - on a new (re-built) engine. The reasons for the low compression are under investigation and I am getting my engine re-built as we speak....

Sean - I'm trying to PM you - it seems you've been "cut-off" from PM e-mails. What's up?

 

Being punished I guess, email me at sean@a-spectuning.com

 

As Russ stated, his car DEFINITELY had a bad motor. He can elaborate if he chooses. Despite that fact, his 40R began spooling sooner than my 4082. Perhaps it's my larger ports or the fact I don't have a boost-proof seal between the compressor discharge and IC piping (it' s a v-band discharge but I use a silicone connector over it) but with compression numbers in the 4's on one rotor, he was spooling sooner.

My 4082 setup (which was tuned very nicely and safely by Steve) is not the optimal setup and is no reflection on Sean's 40R kit. Not even the same turbo obviously. I haven't had a compression check done lately but I am not sure the builder of the engine did a great job in putting it together (not making mid to high 9's compression) and I chose not to use new housings (mistake). I'm sure my engine isn't 100% perfect nor are the component in the turbo system (turbo manifold's runners are too large IMO). I don't think my car is a direct reflection on how well a 4082 could perform either unfortunately. But hey, it's about 400rwhp and it's fast. Fast enough to blow away anyone I've encountered on the steet, er, track in my area. I have no doubt the 40R is actually a better street turbo. It flows more and is more efficient at lower boost levels, spools quicker, and has a water cooled center section. I'm sure as more people start to tune their cars, we'll see a wide variety of numbers, some higher and some lower. There are just too many variables. If I do not go three rotor, I plan on "upgrading" to the 40R kit.

 

The main problem here is that everyone so far with a gt40r kit has had engine problems not related to the actual kit or tuning.

 

What exactly is a "GT40R" anyhow? I don't see any mention of a GT40R in Garrett's stuff... only a GT40.

Brian

 

Same Thing, I belive R ist most turbo's means Racing or something and implies that it's Ball Bearing... but I have nothing to back that up with other than what i've seen the "R" designation put on which are T04(r)'s

 

Well in Garrett's catalog, they distinguish between ball bearing and regular center sections by adding the "R" for ball bearing. I don't see that as an option in their catalog though....

B

 

R ' is garretts designation for BB center section. TO4"R" is aHKS designation.
The catalog your refering to does not list GT40R's they are too new hence the supply problem you guys are are getting the first ones the earlier ones I sold are preproduction prototypes there have been minor changes made. You cataog also wont show the 28-71R or 30-71R or there are also a few others as well.

 

R= Ball Bearing

 

Thanks for clearing that up!

Brian

 

Sean - having one of the "pre-production" units, I'm interested in what the changes are between the new ones and the pre-production units...

 

Keep in mind that Garrett is not completely consistent with their numbering between the GT line and the GT R line. As I have mentioned before the GT35R has a different compressor than the GT35. . Typically, the designation we use for turbos is a reference to the compressor type: eg T04s, t04e, Gt35. I have a 35R with a plain bearing center section. So in this case R doesn't = ball bearing

 

I will guarantee that Garrett does not call your turbo a 35R, you have a turbo assembled by a third party(Cheapturbo.com?), even so called 35R's from precision are not the same as The ones I get from Garrett. He was asking about Garrett designations. You are correct about wheels though they "can" be different, depending on the order.