5 Things You Need to Know About Doc Race's N54 Single Turbo Kit! (335i)

Aaly, one of our head techs here at Precision Sport Industries, has been working hard on finishing up everything on this 335i with the top mount doc race kit. Featuring the Precision Turbo 6266 this N54 is destined for big power. As someone who has done many turbo kits on this platform before we decided to check in on his progress to hear his thoughts on the whole install process!
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[@danielkt7676]

One thing to note is that it is possible to put the kit on the engine outside the car and then install the engine. I have a top mount doc race kit and it worked perfectly fine for me when I was rebuilding the engine. The only downside is that the front of the car must be taken apart to do so which Is not that hard.

[@zanmasterr]

Buying the bottom mount kit Yas!! Can’t wait I’m spending every dollar I have to just smile whenever I’m driving this beast

[@rivashanramduth]

That expansion tank is pretty neat! Great build guys!

[@PrecisionSportIndustries]

It looks great and is extremely functional. A great pick up for sure!

[@stephenpeterson8694]

Only if it was in stock. Been out of stock for like 5 months

[@WinsuTCG]

Damn guys, I am currently on 19t on 24 psi and e40 mix ravaging streets, but I need to get into single turbos soon. Watching your videos and bottom mount kit makes me want to go that route as well. Looking forward for more n54 content and I want to get to know you guys more.

[@Mcleansminecraft]

Go CES they are way more polished and dont inhale O2s

[@gabrielglass2700]

I’m going to get one soon and use the same turbo kit can’t wait

[@PrecisionSportIndustries]

Doc Race really has been killing it with these turbo kits

[@RC-fh5mq]

Great build guys keep up the great work man

[@dragonballzkai287]

Have you guys seen the VI Engineering kits for the N54? Looks like that man has some serious welding game over there.

[@WORM1100]

Is anybody adding the PR Regulator/Filter assembly? With all that was discussed here, fueling is being starved. Why add stage 2 - 3+ and PI if the stock regulator is still in line?

[@dendo49]

Can u guys make a video why the single turbo setup is beter and more relaible then the twins?

[@PrecisionSportIndustries]

We could definitely talk about the pros and cons behind both!

[@1SIK335]

I have a video about that topic

[@mertkanuzun3828]

Hello. I have an n54 335i car and I have an injector problem. Is there an injector model you can recommend for my car?

[@PrecisionSportIndustries]

Genuine or OEM INDEX 12s

[@cesarjimenez9318]

How much would an install like that cost

[@genesisboakye7660]

My car, 09 335i Sedan, is at 556 HP right now and I’m trying to reach 800 HP, would I choose the 6266 GEN2 CEA Ball Bearing setting ?

[@bennyang8049]

Hello, is the doc race turbo cooled by oil or coolant or both? Thanks in advance

[@wilsonbernard6gxfccokj339]

I have this kit with a garrett turbo and is beign cooled by both water and oil you get the option from doc race directly for the cooling of the turbo.

[@richmusick4881]

Do you guys still do this service? Ive got a 335is with the n54 and am sick of the wastegate rattle. Ive been eyeing single turbo conversion for a while

[@PrecisionSportIndustries]

Yes email us.

[@e-hop-c9868]

Does this turbo work on an auto 335xi?

[@aznserpens]

What's your recommendation for a transmission upgrade? pushing 730hp/615tq and kind of getting worried about my manual transmission going out.

[@connordonaldson1028]

you have 2 options you can get an upgrade kit from propultion dynamics that can hold over 850+ wheel torque or u can get a plate from another company that allows u to swap a 6hp28 into your car which can hold 1000+ wheel torque

[@typedrew]

@@connordonaldson1028 he said manual

[@connordonaldson1028]

@@typedrew no he said his manual is going out so he can j swap a 800wtq ready auto trans in

[@HEABtheOrdinary]

@@connordonaldson1028 No he said that he is WORRIED about it going out. Meaning he wants a manual upgrade kit of some sort.

[@islandjeeps921]

Jeees ! 😁

[@Lightsout89]

It would only be leaking due to the heavy as fuck turbo on that single piece do keep the 3 piece design just put supporting brace to take the weight of the turbo when that metal starts glowing it will sag over time there for creating a leak

[@Lilbros20]

hey bro, i own a 2008 328i and it has a straight 6 N52 engine. I don’t know much about engines but would u recommend me taking it to my buddies and put a turbo kit on it? I need help brotha.

[@PrecisionSportIndustries]

Hey! I think you might be slightly mistaken with what engine you currently have. In the 2008 328i it comes with the N52 engine. Typically this isn't a car that we would turbo. There are some options for power adding through bolt ons like 3 stage intake, headers and tune and if you want to go all out you can get a supercharger for it. It all comes down to how well maintained the car has been through its life.

[@dereksmith6365]

Looking to get a doc race kit but can't decide if I want the 6266 or the 6466. any suggestion?

[@devonsmith1995]

Have you guys seen or installed any of the CES kits?

[@PrecisionSportIndustries]

Over the years we have had a few come in here and there. Most recently we have seen the doc kits much more

[@dwaynemurray4741]

Left hand only?

[@bmfairweather]

Is the bottom mount version twin scroll?

[@PrecisionSportIndustries]

No, only the top mount is twin scroll

[@timsintim3346]

Are aftermarket downpipes, reused from when stock turbo when going single turbo?

[@PrecisionSportIndustries]

No, the kit provides an appropriate downpipe.

[@timsintim3346]

@@PrecisionSportIndustries thanks for the reply.

[@dannycooke2616]

Will this kit fit the 535i?????

[@thekillerking7393]

Why it doesn’t have a insulator motor ?

[@Bitaliktderr]

is this kit worth the extra $1000 over DR700? Looking to make around 750 WHP with 6466 Gen 2

[@PrecisionSportIndustries]

Both kits are great. One of the biggest differences is the potential for growth and upgrades on the top mount. Having the extra room up top allows you to go bigger turbo if you want down the line. The bottom mount has less space and therefore limits your turbo options. Check out Vehicle Viral's bottom mount videos to see his that we installed! He just dropped his dyno numbers.

[@Bitaliktderr]

@@PrecisionSportIndustries Thank you for response!

[@bimmerfab]

@@Bitaliktderr doc race told me you can fit a 6870 on the bottom mount kit

[@Bitaliktderr]

@@bimmerfab On DR700?

[@bimmerfab]

@@Bitaliktderr yes

[@gogs9997]

Is the auto as sluggish as people make out ?

[@ivan.e82]

No. Especially if you have a trans flash

[@anthonyjordan7847]

Fuckn beast Just subd

[@zxoly9081]

Bro is there any cheap a good turbo kit 😭

[@PrecisionSportIndustries]

Cheap and good is two hard things to put together. The best bang for your buck for the N54 platform right now might just be the DOC race bottom mount kit. Although it is still roughly $4k you get everything you need and the backing of the brand.

[@DeclanCrane]

@@ZacharyDeanWright Could you link me to the AC Fabrication kit? I tried looking around and just found dead links to the store page.

[@kevinmurzak8496]

@@PrecisionSportIndustries it’s like 6k now

[@blazingaura18]

JESSSS 😂

[@gogs9997]

Man or auto ?

[@josephtrujillo5790]

manual or manual swap it