Choice of turbo ~400hp

[larsaskogstad]

Hello

I might have asked this before sometimes but wondering if someone has any suggestions or dyno curves / first hand experiences with these turbos.
We have some strict rules in Norway regarding engine tuning so Im trying to follow the rules, and what I've gotten through is 392hp.

Original cams, uprated rods, original comp(new mahle pistons), stiffer springs etc etc.



* Would any of these turbos be a good setup for my car. And what A/R would be good on the different turbos.
So the turbos I've been checking out are :

GTX2867r gen2
BW EFR6258
BW EFR6758


Will be tuned by a tuner with a custom ecu.
Want a driveable street car. Not interested in KKK billett.


- Lars

[rxl]

i used efr 6758 in the past. 430hp and 630nm

https://www.s2forum.com/forum/member-s-area/member-s-cars/2059208-black-s2-coupe?p=2059209#post2059209

[larsaskogstad]

i used efr 6758 in the past. 430hp and 630nm
https://www.s2forum.com/forum/member...09#post2059209

Is this on original cams? 0.85 A/R? How is the transient response on/off throttle?

[rxl]

Is this on original cams? 0.85 A/R? How is the transient response on/off throttle?

original cams but the valves are +0,5 bigger 1.7bar boost. 0.85 A/R. had to cut vband flange off and welded on k24 one on. its the fastest spooling turbo that i had.
a bit expensive to get it with all the lines and fitting but i would not know a better turbo for these old cars.

[larsaskogstad]

So this dyno was with the k24 or without?

[rxl]

So this dyno was with the k24 or without?

k24 flange as i used wagner manifold. there is not a lot of space in the engine bay for the turbo.

[larsaskogstad]

Do you think it would be possible to push the 6258 with a 0.85 to around 400? or would the torque probably drop off early or will it just spin 24/7 to reach ~400?
Yeah I've got a wagner with k24/kkk as well

[larsaskogstad]

Or a 6758 with 0.64 ?

[rxl]

Or a 6758 with 0.64 ?

go with 6758 ar 0,85 the is almoast no lag on these turbos. smaller one will definetly be on limit to get to 400 if even posible.

[larsaskogstad]

Because 392hp is what I am aiming for max due to restriction here in Norway.

[larsaskogstad]

efr6258_comp_map.png efr6258_turbine_map.png
EFR 6258 via BW Matchbot

[larsaskogstad]

efr6758_comp_map.png efr6758_turbine_map.png
EFR 6758 via BW Matchbot

[Waje]

I have to install a gt2871R from garret and in theory it gives for that power with a fast charge

[larsaskogstad]

Gtx or gt?

[Waje]

Gtx or gt?

GT2871r is GT, no GTX.

GREETINS