I am still waiting o my t25 G25-550 to come in. They are on back order from Garrett.

365hp with 0.64 and 98 RON is pretty good! Is that a racetrack 365hp or a street 365? Any head mods eg cams?

I've only seen one EFR 6758 claim to make more on 98 RON.

I can't see how such a small A/R can make more power, but there must be some logic behind that decision by Garrett.

It’s both street and track. I tuned both this gtx2860 gen and my EFR6258 and we’re making the same power. Both are struggling on the top end as wastegate is struggling to push this kind of pressures. I think I can squiz a couple more in my 6258 because wastegate control is so much better, on the Garrett is just all over the place even on a harder spring.

On the other hand, I’m working on a 6758 right now and I can tell it will make more power easily, just waiting on a 3bar MAP sensor.

Regarding the g25 a/r you can’t correlat it directly, at least by Garret turbine flow maps, it flows the same as the “old” .64

I have both 6258 and 6758 on hand that I plan on testing against the G25-550. I plan on testing it on a TSE manifold, mkturbo manifold, possibly BEGI Alpha-Omega, and possibly a kraken manifold or two.

Did you test the 6758 already?

Not on a dyno. I have played around with a 6758 on the street some. Don't have and logs I will be sharing of it. One day in the future I will be done a good number of back to back dyno runs to test them all.

Unfortunately since we are in the middle of a pandemic, dropping a ton of money on dyno testing isn't as high on the to do list of other things.

I can tell you that both on my car and yours, we’re making 60% dc on the ebc untill 5500rpm and need to bump it to full close or near close to have 145/150 kpa of boost. In the 6758 I have 60% across all the rpm range and it keeps it rock solid. So I know it’s making already the same power but with a lot more headroom for bumping it up. Of corse know will tell how much, but giving the 15* I can put @ hour boost level, it will make at least, 0,2b more making power

Interesting to hear your experiences.

Good point on the turbine flow charts, I'd seen those too. I also suspect the G25 IWG can move a lot more air at lower backpressure, so maybe helps high RPM there too.

Please post up how you get on with the 6758.

I do not think you will hit 450 with a .49 turbine housing. You need bigger to make over 400. The compressor can do it but youll need about 2 bar of boost and good gas, and the larger hotside. Then 450-500 is doable.

@kamel6k / @leita0 - it might be worth pointing out that everyone here only ever talks about wheel horsepower, not flywheel horsepower like we do in Europe... From one of the other threads where leita0 posted a dyno the 365HP maybe at the fly, 300ish at the wheels...

FWIW, I'm making 300whp (350something fwhp) on a gen1 GTX2860R, external wastegate and the dinky Tial 0.52A/R exhaust housing on UK 97RON (~92 US?) fuel. 1.3bar / 230KPa boost until redline...

@jonboy was we can see the flywheel power measure in most of dynos here in Europe are about the same as WHP in the USA.

Not wanting to get into WHP vs HP..... but 60-130mph in 8 seconds sounds like more power than a dynojet 300whp?

300whp on a 0.52 A/R also sounds interesting! Any plots and hardware info?

https://cimg7.ibsrv.net/gimg/www.mia...de5df172d4.jpg
Noooo - don't go there! ;)

I agree, everyone in the EU uses FWHP, but everyone in the US uses WHP. As this is a US forum, we need to abide by their rules, and never ever suggest that European horses are different to American ones ;) Some of the Australian members suggested that and it got very 'heated'... ;)

60-130mph in 8 seconds means ~350whp/400fwhp. What setup is this?

edit: 365 crank, saw it in the other thread.
I'll go on the Autobahn this week (100% flat) and do a 100-200kmh pull with 265whp and report back.

There's a spec post somewhere on here, but it's basically a fairly standard supertech (8.6 comp?) / chinese rods / VVT head / Squaretop build, tubular v-band EWG manifold (one of the original Ardler / Nortech ones if you ever follow the UK forums), Tial EWG, Owen Developments motorsport spec GTX2860R with the small Tial exhaust housing.

It made an easy 300WHP on a dyno dynamics dyno, the tuner said there was more in it but it was starting to run out of steam - not sure if it's the small exhaust housing or that it's still got the FM 3" ceramic cat in it (or something else). That was on BP 97 (Ultimate) so there's probably some more if we did a 99RON map in it, but I'll probably look into gearbox options before I push it any further...

You were the one that bring this subject to the table ahah

For me its no problem and not a competition its just 2 different ways of measure that are use to compare gains.

The time it takes to make a sprint exercise its universal thats why i put the information of 8 seconds run from 60-130mph measure with dragy.

I don t want to be rude to anyone just trying to get some help and if i can to help out. I will open a build thread with info and videos.

Please guys do miss understand me iam not trying to start a discussion about that.

thanks

It's controversial because it's not true. At least not across the board like y'all make it seem.
I'll gladly compare acceleration data.

Anyways, moving on.

My car does 40-120mph in 8.x seconds something. I don't have a dragy maybe I should get that.

This 400whp car I tuned spins Hoosier slicks :)

Daddy likes, I need to upload some hero 8 footage of my car and post it in this thread lol.

edit :

Thats only at 18psi. I can run more boost but I use a Hydra 2.5 and it needs windows XP. My tuning laptop died and I have the low boost map from the Gap trip still loaded and it has a low boost cut so I need to get another ancient laptop and turn it back up lol. Still spun 3rd gear in that video thats 225/45 Maxxis VR1, which shows the major issue with power is finding a way to put it down haha.