D.O.C.-Race

Finished up a prototype manifold for Horsepower Freaks' 335i Single turbokit. Unbelievably tight fit into this enginebay. Will be released through HPF's store shortly.

SAXON

wow nice, i wonder what they do for upgrading the injectors to keep up with a bigger turbo

ownedevo10

Thats a hot manifold but must be a pity to put in.. Those bolts that are behind the runners must be so tough to tighten down lol... I remember the fight to but on my new o2 dump on my evo and this looks 10x worse hahaha..

Golfball

heck yeah, looks great.

i have a friend with a modded one so i can appreciate how tight those engine bays are so props again on making it work

RenownMN

We have a friend and good customer at our shop who has a pretty modded one, he made it sound like they were extremely restricted by their fuel system.

-Sam

weiRtech

i'm surprised they let you openly advertise that you do their fab. i'd think most places like that want to keep things under tight control with regards to who sees it before it is released.

RynoDyno312

I was going to ask what the fueling options were. When I had my 335i a couple of years ago guys were alrfeady running into the limits of the fueling system on the stock twins.

That being said, if they size the turbo right and get the fueling figured out an amazing powerband should be possible.

D.O.C.-Race

They are producing some fuel components for the added upgrades in there kit. This is a prototype manifold that we built, it's open for anyone to look at.

ToxicFabrication

Two things that stuck out to me, was the runners touching (or so it looks) and that wastegate flange to port fittment.1.25" pipe to the opening of that flange? Should have flared or expanded that for sure.

Other then that, crazy manifold. I know how tight fittment is on those.

frostyrb

i think there will be a problem with the wastegate placement. you might want to put the wategate right on the turbo and get them to sell a manifold turbo combo, or have the customer send there exhaust housings to you to have them modified for the wastegate.

TurboFocus

Wastegate placement is fine, I did one of these manifolds, very similar to yours D.O.C. with the wastegate where he has it and with a 40r it hold 8psi till redline.

weiRtech

frosty didn't mention creep would be the issue. i'd be concerned with fatigue at the wg branch to collector weld. that is a very common location for cracking/failures.

SpeedwayCoating

Manifold looks nice d.o.c.

DC47A

Agreed with Toxic, and if you dont see boost creep with that wg setup I will be shocked. The exhaust gas will only draw from that one side. The exhaust gas does not have enough time to come together and be pulled out scavenging from all six runners. You will see significant creep around 15 plus psi. Try to hold 17 or 19psi per say. Just my two cents from experience and engineering. Hopefully I am wrong and this is not the case. Tubular manifolds on the S52 and S54 much like this have always had uncontrollable boost creep issues. Manifold looks great otherwise. Once the fueling is corrected there is a huge market here.

TurboFocus

thats a common spot for bmw's pretty much the only spot lol. just from my experience the guy i did it for has a little over 30k miles with no problems.

frostyrb

sorry, but boost creep was my only concern. it will not hold steady boost.

D.O.C.-Race

Thanks guys, it's definitely a tight fit in the 335i bay! I don't think we will have any boost control issue's with two wastegate outlets?

DC47A

This has been tried on the S52, and S54 tubular manifolds as well with no prevail. There was still mild boost creep issues. There is still not enough time for all banks to come together and get a proper draw from all six cylinders. It looks good and will defiantly help but I still don't think you are going to really get a pull from all six. Like what would be the back two or three you cannot see in that picture. Look at the boost logic S52 tubular manifold. Although so may say it lacks in quality it has been proven time and time again to have absolutely no boost creep. Looking at it you will see why.

88Hatchy

This looks like an improvement over the Boost Logic manifold, from what I can see.

sp00linhard20

Awesome

D.O.C.-Race

HPF has had great luck with there existing cast design for boost control, we feel pretty good about this layout DC47A. These are still R&D stages of the kit so we'll see how she works; it's being assembled now by HPF for testing.

frostyrb

you will still see creep. i would mount the gate right to the turbine housing, but this is not my manifold design so i will shut my mouth now.

DC47A

Im not trying to be an ******* or beat a dead horse. I am just offering some insight because I have been here before and spent a lot of time with these. Their current tuner cast manifold works great with no creep, and the older Steed Speed manifold works great with no boost creep as well. The steed speed for the S52 has no boost creep either. Basically identical minus the head flange on the S52 and S54. The thing is with the current "tuner" manifold and the older SteedSpeed they've used and I am sure still use is most of the runners come together before they even hit the collector so the exhaust gas is pretty much together by the time it hits the small collector. Which gives you an even draw from all six cylinders preventing boost creep. This is hard to do with a tubular manifold unless you configure it like the boost logic or Maximum Psi's new manifold. Especially with the spacing constraints. They also do not have the points that come together in the collector like yours or most true merge collectors. Which in this case makes it even harder to pull the exhaust gas across to that side where it is pulling from. Not to mention the collector is very small and does not have much area for volume. Again back to the fact that it is so tight cylinder 5 and 6 are a small elbow into the collector. This manifold is very very similar to the 666 Fabrication Jon Volk manifold just tighter given the constraints and the N54 head flange. The volk manifold has major creep issues even being modified to pull like you have on yours. Otherwise the manifold looks GREAT and will make a ton of power and torque. I hope I am wrong and it does not creep. Your work is always nice thank you for sharing. I love the V-mount S13!

D.O.C.-Race

I appreciate the insight. We'll see how it works, getting bolted up in the next day or so and starting intercooler pipes.

Thanks, S13 is my personal car.

Tony the Tiger

Boost creep would be an issue for those looking for low boost low power application.

Those 335i's better be running damn 20PSI or more if they do a single upgrade.. 20+ PSI or more, and the boost creep problem may be non-existent.