Turbo Upgrade Progress

[George Smooth]

A lot of guys have been asking me what the turbo upgrade I am doing entails. Unlike normal cars the 335's exhaust housing is built into the exhaust manifold as one piece so changing the turbos simply is not a easy option unless a complete manifold is made. This is pretty hard as BMW uses unique flanges that inset into the head which means to manufacture a new manifold will require expensive laser cutting to get the flanges correct.
So this leaves you with the only affordable option of upgrading the wheels in the existing turbo's. Below are pics of the OEM wheels and the upgraded ones.

The company I have chosen to buy these units -Rob Beck Turbos- also does a billet upgrade to the waist gate assembly which ensures longevity as the original BMW design is flawed. The oil and water fittings are in the stock location so this is truly a bolt on application.

As everyone can see the term of Big Turbo Upgrade is quite misleading as the only thing big about these turbos are the internal wheels.

 

[Wild BMW]

Good going buddy :thumbsup:

 

[Twinz]

Keep us posted. Rennzport is also waiting anxiously. The waistgate upgrade is a must to do as part of the new turbo option. Nice pics too :thumbsup::thumbsup:

 

[UpNcOmiNg!]

Cant wait to see the rewards reaped!! Nicely! :thumbsup:

 

[Dmonic1]

Looks good George.... well done! cant wait to see it!!! :thumbsup:

 

[SDP]

Whats the difference on the inducer side ?

 

[George Smooth]

Whats the difference on the inducer side ?

Quite large from what I can tell in the pictures.

 

[SDP]

I take it, this will into the fueling limit of the car ?

 

[George Smooth]

I take it, this will into the fueling limit of the car ?

Although not confirmed locally wish a flash tune the American piggy back guys have had to use methanol injection for additional fueling above 1.35bar. I do suspect that they are only using rail pressure do modify fuel rates so time will only show what we can do with the full control of the OEM ECU. I personally will not allow the boost to reach the point that the car will rely on the meth injector.

As a matter of interest the stock TMAP reaches its limit at 1.5bar so even if there is fuel that will be the limitation.

 

[Andz]

nicely going there Mr Smooth

 

[Leon328]

Very nice, but don't through away the Meth injection. It does more than just up the octane, it helps tremendously with cooling the induction temps under high boost as well.

This is going to run like stink when youre done. Keep on posting.

 

[Kaaba]

Lovely indeed

 

[George Smooth]

Very nice, but don't through away the Meth injection. It does more than just up the octane, it helps tremendously with cooling the induction temps under high boost as well.

This is going to run like stink when youre done. Keep on posting.

The meth is a must for the power levels I am pushing now. At the same boost levels the upgrades will have far lower intake temps though but I am not planning to dump the meth as I want to push those turbos to their limit on race days.

 

[Leon328]

Very nice, but don't through away the Meth injection. It does more than just up the octane, it helps tremendously with cooling the induction temps under high boost as well.

This is going to run like stink when youre done. Keep on posting.

The meth is a must for the power levels I am pushing now. At the same boost levels the upgrades will have far lower intake temps though but I am not planning to dump the meth as I want to push those turbos to their limit on race days.

Any ideas on what power levels you are looking at, I think I found your car on 285KW in the speed and sound (DasTec dyno day). If it is so is this rear wheel KW because that is a Hellova Lotta power?

 

[George Smooth]

Very nice, but don't through away the Meth injection. It does more than just up the octane, it helps tremendously with cooling the induction temps under high boost as well.

This is going to run like stink when youre done. Keep on posting.

The meth is a must for the power levels I am pushing now. At the same boost levels the upgrades will have far lower intake temps though but I am not planning to dump the meth as I want to push those turbos to their limit on race days.

Any ideas on what power levels you are looking at, I think I found your car on 285KW in the speed and sound (DasTec dyno day). If it is so is this rear wheel KW because that is a Hellova Lotta power?

Hi Leon,

The car was not run properly at Dastek. It peaked at 6000rpm where my peak is normally at 5500. At 5500 at Dastek it made 100wkw less which means the dyno operator floored it as the rpms climbed. The power at the wheels is just short of 300. With the upgrade and same boost it should jump to 340 or so. The advantage is the upgraded turbos are good for more boost.

---

Here are some progress pics:

Machined compressor housing vs stock:

Stock wheel in housing:

Modified wheel in housing:

 

[Leon328]

Sounds great, 300WKW is flipping strong ino, what are the torque figures like.
Is the fueling sorted for more boost as well, if so what did you do and how much boost do you want to run.
I know it's a lot of questions but anything new I can learn might make my car a bit better.

 

[George Smooth]

Sounds great, 300WKW is flipping strong ino, what are the torque figures like.
Is the fueling sorted for more boost as well, if so what did you do and how much boost do you want to run.
I know it's a lot of questions but anything new I can learn might make my car a bit better.

The stock fuel system is good for up to 350wkw. Thereafter you got to start using a meth injector for extra fuel. I am not going to go that far though. At 1.4bar it should make the 340 with the fuel system being quite comfortable. At this stage there is not fuel upgrade available due to the DI injection. If anyone plans to go bigger and does a complete new turbo upgrade they will have to add a second set of injectors.

 

[Leon328]

Awsome, can't wait for the Dyno slips.

 

[George Smooth]

Awsome, can't wait for the Dyno slips.

Haha in this day and age dyno slips do not mean much. Most people think the dynos are all rigged. Rather get it done at the track with MSA where a second is a second and can never be disputed.

 

[Rascal69]

Mr Smooth opperator :shocked: Nice write up buddy, big up to you for being honest and creating this very detailed post... :thumbsup: I cant wait to see how the times drop with this new setup...