The efr is good value for custom fabricated setups, no doubt. However the GTX will go on a taco taco and still make 400whp, the above GTX plot is a bolt on T25 setup, internal gate and everything. In Australia the GTX is cheaper. $2450 aud vs $2525

Dann

pricetags seem to vary a lot.

in europe a GTX 2860R gen2 is 1350€ and the EFR6258 is 1600€.
think both turbos are the most comparable in response and power output as they can get you to ~400whp with the right (same) setup.

depends on where you live and what you already have, i think...

nitrodann is comparing real power output at a given rpm between setups and i understand that, but its like fake boobs.
can look the same, but won't feel the same :giggle:

100hp@3000rpm is 175 ftlb whether it comes from a car, chainsaw or go kart.

The only thing a dyno doesnt show is transient response.

Dann

The way they get to that point is also something you can't see on a hp only dyno plot unless you have all the data displayed. It's part of transient but not quite.
You can easily have two turbo's making the same power at the same rpm, heck you can even make the same torque at the same rpm, but one might have a fatter curve and one might leaner curve kinda like I demonstrated with the efr plot. So unless you compare every part of the curve, you could make the conclusion that they are equal.

There's really no point in beating this dead horse any more so I'll stop. There's nothing wrong with GTX turbo's, but being so close in price here in the US, I'll take EFR over GTX every day. Pepsi vs Diet Coke :)

https://cimg6.ibsrv.net/gimg/www.mia...ca6d84075f.png
https://cimg8.ibsrv.net/gimg/www.mia...f284c2f913.png

All i know is i had a BEGI S5 EWG cast manifold setup with a gt2860r in a T3 exhaust housing, nb2 with vvt, and 2.5" exhaust, and this setup felt like shit compared to my 6258 setup.
Floor the begi setup at 3k rpm, and its , nothing, nothing, nothing, 4k rpm ok, i start to feel something, 4.5-4.8k rpm OK HERE WE GO.
The efr6258 floor at 3k. instant 6psi, 3500rpm yes, here we go. 4000+ holy shit, HOLD ON.

basically the 2860 was a full 1k+ rpm delayed when the power hits. and car felt slow as shit on anything under 4k rpm.

The EFR basically feels like my 2560, but with a much stronger top end

I dont know about these fancy shmancy GTX 2860's, and dont care as efr is better and cheaper.

which AR on the 2860R? .86?

hard to compare your two setups. put a GTX 2860R gen2 on your kraken setup (i own the same) and i think the difference to the EFR isn't that much anymore...

I drewd you a pitcur, see?
https://cimg8.ibsrv.net/gimg/www.mia...492e6888e2.png

Pidgeon chess.

*Pigeon

:D

Wonder how many people who speak Pidgin know how to play chess....

Fucking pokemon.

https://cimg8.ibsrv.net/gimg/www.mia...f6a7bf6bb7.png


Dann

I know this thread is 2 years old, but borka, can you share your VVT map?

Also I'm curious to know how you're running 21 degrees of timing at 200 KPA without E85, that can't be good.

Pretty sure I'm running right around 20-21* @ 1bar boost. I'll have to check but I'm pretty certain. That's how you make power, also lower CR allows for this.

I haven't had the chance to dial my setup in on a dyno but i figured i was being conservative at 14deg@ 1bar on my 9:1 forged TSE 6258 setup. Seems i'm leaving a LOT more on the table than i thought. Also running e85 but it's the crappy NY stuff so its more like e55/e60 at best.

I'll have a look at my map and see what timing I'm running at 1bar but I'm pretty sure it's right around there.

Yep on 93 octane I'm running 20* up top. 14* ramping up to 20*. 8.5:1 cr, gtx2860 gen2