Looking to hit close to 800whp. What setups am I looking at ?

twinturbos

Sergeant
Jan 1, 2019
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E92 335i MT
Hi,
I am running a docrace 6266 build. Plan is to build the engine over winter: pistons, rods, studs, bearings, valvetrain. Looking to get as close as possible to 800whp. I have access to 94 octane and am running a WMI setup currently right around 600whp. What are my options to push 800whp after the engine is built ?

E85? A bit complicated to get so if I really have to go this way I'd like a E30 or E50 mix.
PI+
Spool overdrive hpfp ?
VTTO shotgun ?

What's your optinion on what the best setup would be best ?
 

iminhell1

Sergeant
Jun 17, 2018
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E85 or race fuel (110).
Spool 4x (unproven) or DBBL (proven), if DI only. PI can also be done and is well proven; various options using JB4, Split Second or something else.
6766 (proven)

Ditch the WMI. It can't support the power.
 
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RuskiRacer

Captain
Jul 17, 2019
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2009 e93 335i
Hi,
I am running a docrace 6266 build. Plan is to build the engine over winter: pistons, rods, studs, bearings, valvetrain. Looking to get as close as possible to 800whp. I have access to 94 octane and am running a WMI setup currently right around 600whp. What are my options to push 800whp after the engine is built ?

E85? A bit complicated to get so if I really have to go this way I'd like a E30 or E50 mix.
PI+
Spool overdrive hpfp ?
VTTO shotgun ?

What's your optinion on what the best setup would be best ?
Are you going to sleeve the block?
 

tisdrew

Corporal
Jun 27, 2017
179
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09 335i 6MT
I may be out of the loop but I believe the only way to hit 800 is to go with port injection at this time. With good head porting, you may be able to eek out more power with less boost on your pump gas octane and I think octane will be a limiting factor. Your engines compression ratio will be a factor in how much boost you can run before you get knock -- consult with your engine builder and tuner as I am neither.

I would think a PTE 6466 could do it but you might be octane limited. You can go bigger like 6870 or go with other turbo options like GTX3584RS, GT42, EFR 9174 depending on your brand and power band preference.
 

nyt

Sergeant
Sep 15, 2019
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The 6266 should get you close to 800, the 6466 closer to 900. the 6870 is a bit big imo, limited around 1100.
 

Scorpstan

Corporal
Feb 27, 2017
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335i
6870 will never hit 1100 on an n54...probably not even 1000

i have close to 1k HP with 34-34,5psi. and still have room for improvement 🤔
head is stock.


Hi,
I am running a docrace 6266 build. Plan is to build the engine over winter: pistons, rods, studs, bearings, valvetrain. Looking to get as close as possible to 800whp. I have access to 94 octane and am running a WMI setup currently right around 600whp. What are my options to push 800whp after the engine is built ?

E85? A bit complicated to get so if I really have to go this way I'd like a E30 or E50 mix.
PI+
Spool overdrive hpfp ?
VTTO shotgun ?

What's your optinion on what the best setup would be best ?

with the 6266 you will need 35-33psi, 12-14ign (with 100% WMI mix),
but better with e50 fuel with Helix or Shotgun and small PI,
min. stage3 intank fuel upgrade. better stage4
 
Last edited:

tisdrew

Corporal
Jun 27, 2017
179
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09 335i 6MT
The 6266 should get you close to 800, the 6466 closer to 900. the 6870 is a bit big imo, limited around 1100.

Yes, but I believe those would be E85/race fuel numbers. Given that limitation, a larger turbo with less psi and less heat might make the power he's aiming for. I've seen two local 6870 setups and neither of them broke 900 and that's with E85. I obviously don't know specifics but they had more money into their mods than I had into the full cost of my car lol
 

nyt

Sergeant
Sep 15, 2019
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2010 335xi
Yes, but I believe those would be E85/race fuel numbers. Given that limitation, a larger turbo with less psi and less heat might make the power he's aiming for. I've seen two local 6870 setups and neither of them broke 900 and that's with E85. I obviously don't know specifics but they had more money into their mods than I had into the full cost of my car lol

800 on 94 octane and wmi... good luck with whatever turbo. I'm not sure you're going to be able to do that reliably even with a lower compression engine build.
 

Milan

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Dec 24, 2016
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i have close to 1k HP with 34-34,5psi. and still have room for improvement 🤔
head is stock.

You have close to 1000, but not 1000, and certainly not 1100. I don't buy the room for improvement argument, and please don't take it personally I think this is true for anyone who says it's a "conservative tune" or there is "a lot more in it".

When you went to the dyno to tune your car, you probably didn't set out to do it 50% and call it a day, at least I don't on any of the cars I tune. I'm betting you went as high as you could go before running into other issues. 35 psi you are out of compressor efficiency, I'm sure you could turn it up more, but I bet you are only going to get a few whp per psi of boost.

Basically if you could have turned it up more, you would have
 
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nyt

Sergeant
Sep 15, 2019
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35 psi you are out of compressor efficiency, I'm sure you could turn it up more, but I bet you are only going to get a few whp per psi of boost.

What compressor map are you looking at?
 

Scorpstan

Corporal
Feb 27, 2017
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335i
You have close to 1000, but not 1000, and certainly not 1100. I don't buy the room for improvement argument, and please don't take it personally I think this is true for anyone who says it's a "conservative tune" or there is "a lot more in it".

When you went to the dyno to tune your car, you probably didn't set out to do it 50% and call it a day, at least I don't on any of the cars I tune. I'm betting you went as high as you could go before running into other issues. 35 psi you are out of compressor efficiency, I'm sure you could turn it up more, but I bet you are only going to get a few whp per psi of boost.

Basically if you could have turned it up more, you would have

Well, on that dyno day, my tiny 300cc PI injectors were the limited factor. Now I have 750cc. Tests on the road have so far been successful.
On that dynoday we could also see how the HP increased constantly. Every 2 psi more results in 40-50 hp more. therefore i think that 1000-1100 are definitely possible with the 6870.
but i will see ^^
 
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tisdrew

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Jun 27, 2017
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800 on 94 octane and wmi... good luck with whatever turbo. I'm not sure you're going to be able to do that reliably even with a lower compression engine build.

Yes, I think we're in violent agreement :) Just trying to give out some information and advice to the topic creator so he can do the best within the constraints he provided
 

Milan

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Dec 24, 2016
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Well, on that dyno day, my tiny 300cc PI injectors were the limited factor. Now I have 750cc. Tests on the road have so far been successful.
On that dynoday we could also see how the HP increased constantly. Every 2 psi more results in 40-50 hp more. therefore i think that 1000-1100 are definitely possible with the 6870.
but i will see ^^

So if you run 10 more psi you are going to gain 500 more whp? See how silly that sounds?

Turbos have compressor efficiency maps, you don’t just add psi forever and keep making power. I’m sure you understand this at some level because you chose a 68mm turbo and not a 62mm one.
 

Milan

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Dec 24, 2016
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What compressor map are you looking at?

The compressor map of experience from having a 6870 on my car. Precision doesn’t release compressor maps for their turbos.

6870 is not an “1100 hp” turbo. And AFAIK no one has made 1000 whp on this platform without a 72mm+ turbo.
 
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twinturbos

Sergeant
Jan 1, 2019
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E92 335i MT
Nice to see y'all go off like this. Anyways. Need to get as close as possible to 800 on 94 +WMI. Still looking to hear what kind of setups are ideals and if someone has one of these I'd love to hear more/see pics.
 

Manuel416

New Member
Jan 28, 2020
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Maybe you should be Aware of your talkings, scorpstan has the Most reliable/fastest n54 all around..or show ne Others that deliever on every Event (rollracing) or Post as often new "record numbers" of 100-200, 60-130 etc...not only the numbers of the dynos are important ;)

He knows what to do. And if you look at His powersheet you See that max hp was at around 6500 with a climbing curve, he didnt rev Higher because of fueling,not because of his turbo, as He Said.
 

nyt

Sergeant
Sep 15, 2019
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2010 335xi
So if you run 10 more psi you are going to gain 500 more whp? See how silly that sounds?

Turbos have compressor efficiency maps, you don’t just add psi forever and keep making power. I’m sure you understand this at some level because you chose a 68mm turbo and not a 62mm one.

If 2 psi was getting him 40hp... 10psi would be getting him ____ ??

Let's at least math right.
 

nyt

Sergeant
Sep 15, 2019
331
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2010 335xi
The compressor map of experience from having a 6870 on my car. Precision doesn’t release compressor maps for their turbos.

6870 is not an “1100 hp” turbo. And AFAIK no one has made 1000 whp on this platform without a 72mm+ turbo.

Oh yes, the imaginary compressor map in your mind. That's the point. You have no real idea when it's running out of steam.

Turbo is clearly good for over 1000.

This is on an S54, but the turbo is making the power.


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