I am building my motor on my Evo 8 ,high spec to rev to 9K.Keeping it 2ltr

I have the AMS spec kit GT3076 .63 housing that has the AMS 5 bolt Hotside .cams GSC 264in 272ex

now the builder has suggested i upgrade housing to .82 with the car reving to 9K now . but i am a bit worried about lag with the .82 am i worried about nothing?

Car is used for trackdays and hillclimbs ,NOT a daily drive

Suggestions ??

 

You are prob going to lose 300-400rpms going to the .82 housing if I had to guess. I'm not sure that I have seen a straight back to back. Also if you have the std GT3076 I would send it to FP and get the HTA3076 w/ the .82 housing.

Also I am not a fan of the older GSC cams... Have you thought about upgrading cams too? The new S2s are much better.

Have fun revving to the moon, and personally if this was my car I would do HTA upgrade w/.82 and larger cams.

Mikey

 

I can live with 300-400rpm's ,Garret R2800 0.82 housing is what he will install for me, This is for now ,as the GTX3076 0.82 ex is on the cards in the future but only in a few months.
What size cams would you suggest for .82 housing?

 

Well I have not seen much testing yet, but I would bet my car that the HTA3076 from Forced Performance will out preform the GTX3076

I think you would be really happy with the GSC S2 cams (274/274).

Mikey

 

Not sure if i can get the ex housing from FP (have 5 bolt),not sure if this is standared,Turbo came from AMS with Ex mani and W/g as a kit .

Will look into the cams price wise

 

I am thinking that is not a safe bet

FP's website states the following...The 76mm size HTA wheel has 54.8mm inducer and flows over 57lb/min without dropping efficiency, and works well at pressure ratios as high as 4.5:1 .

The GTX3076 is a 76.6mm wheel with 58mm inducer and flows ~64lbs/min

 

Shane, save your money and wait until you buy a GTX. Then buy a complete turbo.

 

^ I understand that the GTX has a larger wheel. However that doesn't mean it will make more power, a lot more goes into it than wheel size. I really don't care what Garrett says until I see some positive third party testing.

I know that my turbo, a FP Black is rated at 67-68lbs a min but mine is actually flowing at 75+lbs a min. I will not say anything bad about Garrett because they make great turbos but the new design has yet to be proven. Also not a fan of the ATP turbos unless they prove to make power also.

One thing I would like to point out.

The GTX compressor wheel is a 11 blade design. Usually the higher number of blades the higher the flow rating and midrage power (most the times heavier too, slower spool) however they tend to drop efficiency in high rpms do the the blade design. If you look at an FP turbos they use a 7 blade design and the FP turbos do not drop efficiency, just like you stated above and will create better topend power! Actually now that I think about it, all the billet design turbos I know of have 6-7 blade compressor wheel design.

We will just have to wait until they are tested third party. Also it wouldn't surprise me if the stock appearing ATP turbos that they say are rated to 700hp doesn't actually mean 700 crank horse power! The reason I say that is because it is really a Garrett product and Garrett rates all their turbos to crank horsepower... I have seen nothing to make me believe the GTX3582 will make 700whp like the FP Black can. Also I made more power on my FP Red at 30psi then the ATP GT3582 on high boost E85. Just saying. I will believe everything and be a supporter when they prove me wrong.

I hope they do because these are interesting tubros non the less. Don't be mad that I'm just an FP love guy. Robert is a good friend of mine and I doubt he will let Garrett out smart him!

Cheers

Mikey

 

Sorry Shane I over looked your post. No FP doesn't sell a 5 bolt. Only 4 bolt or v-band. AMS does a few things different than the rest of the community.

Mikey

 

Curious as to how you came to the conclusion your Black will flow ~75lbs/min. Was it something FP said?

Regarding the number of blades in a compressor, the higher count will actually have a reduction in total mass flow due to a total smaller inlet (when comparing identical hub and outer blade diameters). The benefit to full blade design is the ability to run higher PR, which can in turn give more horsepower.

And for horsepower ratings, Garrett uses the standard 10 crank hp per 1lb/min of compressor flow. Its a good general rule to follow, but when you run a higher compression ratio or higher boost, efficiency is up and that leads to more power. Im also curious myself as to how the ATP turbos will performance. The compressor can definitely handle 700hp crank, but its really going to be determined by how well the turbine housing can flow.

 

That is correct. Right out of Robert's mouth... for what it is...

We will just have to wait and see what happens. the ATP kits are famous for being, well I wouldn't say junk, but close to it. The housing design and quality makes the world of difference. You are correct that the compressor can make 700hp but will they? I'm honestly just on the fence and we will see what happens. If it blows FP out of the water then congrats to Garrett!

btw I just ****ed your post up by accendent. Still getting use to being a mod and hit a wrong button and deleted it. It looks like it is fixed back to normal now.

Mikey

 

Interesting. Are they just under-rating the compressor on the website, or whats the deal?

Yeah, some of their other kits havent worked out so well. Too bad they cant design the housings like the Garrett bolt on turbos.

No worries.

 

They are a bit under-rated. A black can flow 70-71lbs a min. Mine is just a ****ing beast I guess.

I didn't delete your post this time

Mikey

 

Sounds like it! I just saw the thread on your record, its definitely in the 75lb/min area to make that kind of power.

LOL thanks

 

Thanks, ya my turbo is working it's little a$s off!

Mikey