good to hear you Orbelo!you convince me to keep my a28s instead going with a3076! your dyno number are quite impressive ... have you had a chance see how she trap? or any 60-130 yet?
Fadi why selling the ski 850 kit and go for similar poweband?you already did 4.9 sec 60-130 and still on the table...are you expecting more with a28s or gt28?they flow 48 lb X2 (920 hp max)

 

Thanks Orbelo, your dyno sheets help a lot, seems gtx2871 will still do a lot of work.
What turbos did you end up with?

Mike the reason I am going backwards somehow is I've bought a GT-R, already bought an AMS built engine and going for GTX3076 or gtx3582 with .82 A/R setup and the other upgrades. Hopefully will get 1150+whp and have the gt-r as the highway car.

The 996tt will be used a lot on the raceway but as already have built gbox, engine, big fuel system etc would like to get turbos that can be used for raceway but still deliver some power up on top if I want to go crazy. They are pretty different machines in the end, till now can say the 996tt is more fun

As you said my setup isnt maxed out and my turbos are good for 150mph trap and low 4s 60-130 for sure with the right setup.. They arent on the shelf ski850 turbos with older technology, but billet compressor wheels, ball bearing and biggest housings and wheels making them very similar to big AR gtx3076 or even gtx3576. I want to move the power band to the left as I am not going to do any heads work, cams, etc or even build the engine to 3.8 and for the raceway they just hit so hard, even at low boost they are very pleasant on the street, if racing some serious competition on the raceway I need different and more predictable power delivery.

 

Holy... 1100+whp gtr !!that is a lots of fun coming, let us know when she's alive...

so i get your point !also have you look at the super fast spooling gt28rs? they were popular choice for guy who like to track...

wish you the best with all these project

 

No 60-130 but if I had guess based on the torque and hp I would probably be in the low 5's to high 4's. I moved over to custom Tial 3082's. Dont have numbers yet but should be around 1100whp I'll post numbers as soon as I have them...

 

The stock engine car at 26 psi was that on 93 octane, MS109, E85 or other ?

 

91 and 100% methanol

 

Impressive.. 100% meth and 91 oct = what AKI (Ron+Mon)/2

around 100 ?

 

3rd GEAR pulls from low mph WOT

Datalogs from my K24s on E85 in varying temps

http://datazap.me/u/groupamerica/e85...&data=1-4-5-14

55F temps, near sea level, fuel an exact E85

2500 rpm 0.2 bar
2900 rpm 0.5 bar
3300 rpm 0.78 bar
3700 rpm 1.1 bar
4000 rpm 1.3 bar
4300 rpm 1.4 bar

85F temps, near sea level, E78 fuel

http://datazap.me/u/groupamerica/e85...log=0&data=1-4

 

Thats correct. If I had race gas MS 109 probably in 730hp's+... for street the Ft Lb is key... however, I must say though if you don't have all the supporting mods get ready for broken parts, ( I have chewed through 2nd, 3rd stock axels etc, with the A28's)

 

Awesome! Thanks Wolfhedge. If that's the case with the k24s on E85 and you're stating 5-600 rpm bump that's impressive! I mean even with such a high HP capable setup (3076), it's still responsive in the mid range! So just to confirm you are currently on 3076's right now correct? I figured that's why you are considering down sizing.

 

No I am on K24s using E85 going up to 3076's looking for a consistent 650 rwhp

 

ah ok...my bad. Thanks for clarifying

 

honestly for 650 rwhp i think 3076 is overkill. with srm getting 900 out of k16/68 turbos and i have 650 with 1 bar on e85 with 3071. it doesn't seem unreasonable that you can have this level with just a billet upgrade on your k24 for less than half the cost of tials

 

+1 do either hybrids or do at least rods+3076, they are too big to run 1.3-1.4bar only... try 1.7bar and above and you will be amazed, also for 2+bar should do external WGs and turbos might be maxed out too.

For alpha3076 I would use them at 1.8-1.9bar where I guess their sweet spot is, otherwise go smaller turbo, with all the options today based on k16 or k24, should be easier.

 

I plan to run up the power later so may as well do alphas now

If you make 650 rwhp on 1 bar on 3071 that means we could run the 3076 with low boost and E85 for 650-700... I recall that old closed thread where prodigymb showed comparative dynos on diff turbos... on E85 the 3076 ramp almost as quickly as alpha 28

https://www.6speedonline.com/forums/...o-overlay.html

I will ask about time to do rods and headstuds