Reapur

Please share that info with us, all the research I've done shows that the GTX spools 300rpm faster and has better flow than a GT equivalent.

Spec_Ops2087

Because to maintain a more "stock feel" (aka flat torque curve) a GT35 fits the bill perfectly vs the torque mountain you get with the smaller GT30. Also the flat torque curve is better for road racing as the power is more controlable.

liquid_helix136

"Get the smallest turbo that will support your power goals" is what I've always gone by. Dont take that sentence and run with it saying "Thats BS, I could take the greddy kit, run aviation fuel and boost 30psi and get 500whp, doesn't mean I should" Thats dumb.

Go ahead and race a gtx35 s2k at 500whp and a gtx30 s2k at 500whp and tell me who comes out on top, the guy said he likes the low end grunt of the greddy kit and just doesn't want to die as much up top. Sounds like a gtx30 to me.

I've also read that the gtx30 is basically the same as the gt30 but just has more top end available, so if he wants to up the boost later on, I would just get the gtx right now and not have to worry about it, that way when the inevitable day comes, he will just be able to up the boost and not have to worry about it dying out up top (Unless you decide to shoot for 600+whp)

Reapur

What mountain climb of torque ?

Just below 10psi GT3076r on pfab ELTM

SlowTeg

I think some of you need to read this snippet over and over a few times. After reading that, I'm not sure why anyone would even recommend a gtx35..? He had a GREDDY kit before and liked the fast spool/good low end. Regarding the gtx30 vs. gt30 I can't comment, but to those recommending the gt35..

Nyther

Please share that info with us, all the research I've done shows that the GTX spools 300rpm faster and has better flow than a GT equivalent.
[/quote]

Thanks for the help sofar guys!

Check this link and scroll down
https://www.s2ki.com/s2000/topic/841...turbo-for-s2k/

I also run a us 93 octane fuel and have the option to go e85 in the future...

I dont mind getting some recommendations to go gt35, as long as there is some feedback why i should go to a bigger size. I only drove my own greddy turbo s2k and a vortech 400whp sc s2k once. That was great from 6-9 but was lacking low/mid range...

I do alot of road racing in canyons and the setup needs to be non laggy and responsive. I dont like a turbo setup that gains like 100whp in less than 1K rpm ( those gt35 setups tend to do nothing dow low and suddeny BAM 100whp extra from 5k to 6k.. That would not be any usefull unless im on the highway....

Can anyone tell me if the gtx3071r will outperform a gt3076r at around 14 psi?

Thanks for helping!

Reapur

Please share that info with us, all the research I've done shows that the GTX spools 300rpm faster and has better flow than a GT equivalent.
[/quote]

Thanks for the help sofar guys!

Check this link and scroll down
https://www.s2ki.com/s2000/topic/841...turbo-for-s2k/

I also run a us 93 octane fuel and have the option to go e85 in the future...

I dont mind getting some recommendations to go gt35, as long as there is some feedback why i should go to a bigger size. I only drove my own greddy turbo s2k and a vortech 400whp sc s2k once. That was great from 6-9 but was lacking low/mid range...

I do alot of road racing in canyons and the setup needs to be non laggy and responsive. I dont like a turbo setup that gains like 100whp in less than 1K rpm ( those gt35 setups tend to do nothing dow low and suddeny BAM 100whp extra from 5k to 6k.. That would not be any usefull unless im on the highway....

Can anyone tell me if the gtx3071r will outperform a gt3076r at around 14 psi?

Thanks for helping!
[/quote]

It won't, the GTX series of turbos give extra headroom for power, they dont put out the same power at equivalent psi. I'm at 10psi and pushing 444whp in comparison CKit at 17psi is only pushing 473.5whp using a GTX3071. my GT3076r would be well into the 500s @ 17psi.


If youre referring to Metros post of the Ptuning dyno graph, Id like to point out that they are two different cars on different days. Look at the information box lower right side. There are a number of variables that could change spool so we cant say for sure using your example. They are also not at same boost levels.

Trackforged

If you can afford the gtx get it.

Evan

CKit

EDIT: saw your dyno above.

The main thing is the area under the curve. Our current setup is for torque. It makes more torque than all other cars in the 500-600 whp range except for one other.

But there are a couple other tricks that we used to get that torque.

Also, for people that think that "mountain" of torque is difficult for road racing, have you ever road raced?

With proper gearing, you'll never be under 5000 rpms on a road course so there is no mountain. Just a beautifully flat torque curve in the usable area of rpms.

The bottom halves of dynos are artificial when not load-bearing. The top half is where all the information is at. Unless you plan on being out of proper gear or rolling without a launch / revving.

Let me repeat that again:
Unless your car only has ONE gear, you have to look at the RPMs that you use the most and not just the peak horsepower or the entire dyno plot. 5000-8000 rpms are the most useful for most racing applications, 4000-9000 for most street driving.

dsddcd

I agree and add for many an GT28 would be an even better fit