Basically, prepare to be Stallowned.

As others have mentioned, you are talking about lag when it has been clearly stated and proven that the car's kit had JUST been installed and was experiencing a severe wastegate leak. Here are three sets of numbers for you to play with:

July 15: 82 degrees: wastegate leak: 3rd gear pull
RPM WHP/Ftlbs
4000 130/175
4500 190/225
5000 300/315

July 26: 103 degrees: wastegate fixed: 3rd gear pull
4000 155/200
4500 240/280
5000 380/390

July 26: 103 degrees: 4th gear pull
4000 205/270
4500 350/400
5000 390/410

MorriseySmiths -


Here is a better link to view the photo of the dyno runs:
Bigger Photo of Dyno Runs

 

Well, we'll see shortly if ATP's kits really suck, from what we have all seen, I refuse to believe that a garrett turbo will behave that differently from kit to kit, only slightly but not worth 2-3k more.
Not talking down on anyones kit, but I have learned not to believe everything heard over the net.
As far the two not looking similiar, well, it seems thats a matter of opinion, again nothing against anyone.

 

Nice Job...

 

...ATP kits do not perform anywhere close to a full spec Garrett turbo on most of the available kits out there Vishnu, AMS, Full race and so on.
But if you want to see for yourself go right ahead

 

And yet another opinion, with nothing but he said she to back it up, Thanks for the info......

 

That is amazing and wonderful and a little hard to believe (I'm not trying to challange you at all but to have full boost so close to stock with a big turbo... well maybe I'm missing something)

But...
makes it look like you aren't getting full boost until around 5000 rpm

 

If you read the discription, it says that those were done with a wastegate leak. I see a 4500 RPM spool up on the dyno, in 3rd gear for the run with the leak fixed. I didn't drive bretts car, but with those dyno results, shiv's notes sound about correct.

 

On a 5th gear roll-on, a big turbo will make full boost 1000rpm or more before it would make full boost on a dynojet (especially one with the smaller F&R rollers). The hjigher gear induces a slower ramp-up rate. Which means more time under load which means more boost at the same RPM. Same reason a stock turbo wont make full boost in first gear until 5000rpm wherease it will make full boost in 5th gear by 2800rpm.

Shiv

 

[QUOTE=statix]Quote:
Originally Posted by Dyno4mance
...ATP kits do not perform anywhere close to a full spec Garrett turbo on most of the available kits out there Vishnu, AMS, Full race and so on.
But if you want to see for yourself go right ahead

And yet another opinion, with nothing but he said she to back it up, Thanks for the info...... QUOTE]

If you read through the thread, you'd see I had the ATP kit on my car prior to the stage 2. Andrew's statement of "anywhere close to a full spec Garrett" is a little enthusiastic. The two kits have similar PEAK numbers and both are very strong runners.

The fit and finish of the Vishnu is superior, but these two kits fit different market segments. For someone who wants an inexpensive bolt on (relatively speaking) the ATP kit is a great compromise.

I wanted the stage 3 Vishnu but the reliability of the stock manifold and a quiet stock looking set-up. We compared the dyno graphs of this set up with the stage 3, and under identical environments, we're not so sure there is much of difference if any. Shiv thinks maybe there's 15 or 20 hp on race gas. On 91 there's no difference.

The ATP is not quite the stage 2. It gives up 4-500 rpm on the bottom and tapers off up top compared with the Stage 2.

In a drag race the Vishnu would jump out to a car length by second and pull away through the end of each gear but again that's my humble opinion, but I do own both

If the Vishnu stage 3 is 10/10ths, the Stage 2 is 9.5/10ths and the ATP 8.5 -9/10ths as far as what kind of performance you can pull out of a 3037. IMHO

 

Tom and I took the car out before Shiv dyno'd it and we saw 12 psi on the boost gage by 3800 rpm in 3rd. But that's spool, not full boost. (We got yelled at by Alfred for getting into it )

 

they look very nice.

i guess that's the stock exhaust manifol with ceramic coat on it? are they ported by chance?

 

Just looked at some dyno results today on our dyno computer at the shop. Compared to the ATP 30R kit, our 30R Stg2 kit has a 200ft-lb advantage at 3800rpm and a 50whp advantage at 7000RPM, on race gas. Even on pump gas, the "sweet spot" on the Stg 2 kit is much wider. Most of this has to do with the ATP hotside which gives up efficiency when it comes to spoolup and top end power. This has been proven over and over again on many different cars.

Shiv

 

The header in the pics are painted black just to look cool. Ceramic coating is an option for those who must have it. We have not experimented with porting the exhaust manifold. Stock, the casting quality is remarkably good.

shiv

 

I am very impressed. More than likely, I think this is the route I will take when I consider a turbo upgrade.

Do you think that 400 whp (awd dynojet) is feasible on 93 octane pump gas with the typical supporting modifications?

In the long term scope, would you say that the GT3071R is an ideal turbo for a 2.2 stroker revving to 8.0-8.5k on pump?

Thank you for your time in developing this upgrade and catering to our questions.

-Rich

 

It made 373 in 100 degree weather on 91 I think with 2 octane points and a little cool air and you'd be very close to 400.

Why would you want to stroke your motor and then use a 3071? It spools fast on a stock block and can rev to 8k if you want it to. Did you mean a 35R?