Hey Guys! I've posted a few times here and there about my custom single turbo I made but thought I would make a dedicated thread since I finally hit a goal I've been trying at for a while. First I'll give a little backstory:
Car is a 2007 E90 335i 6MT I bought with 130k miles after crashing my older E92. Went directly to FBO then upgraded twins setup in 2017. I enjoyed that setup for a while (~640whp on 26psi) however with less than 10k miles on them I developed intermittent smoking issues. After going unresolved from the manufacturer, I sent them back to be rebuilt and sold them. Back when I had my old E92 I had planned of building a single turbo manifold from the stock turbofolds but never got around to it, so I thought now would be the perfect time.
Over this past winter I build the manifold/hot side kit, swapped in a lower 80k mile longblock (old engine was still fine, just got a good deal on this engine and wanted to save mine for another project), and put in an XClutch organic twin disk. Below are some pictures of the manifold, but it's a pretty simple "log" style single scroll, utilizing a vband inlet turbine housing and stainless schedule 10 pipe. I have a good spreadsheet I'll link with a parts breakdown and price I paid for everything, but it was under $3000 considering I had alot of the parts/materials sitting in my garage.
And here's the link to the google spreadsheet for parts I used:
After I got it up and running well, got the calibration ironed out, I rented a local dyno for some dialing-in and numbers and ended up putting down 708whp (STD correct) on 30psi. I have cal'd it as high as 33psi, but I couldn't get enough load on the dyno to reach that boost so 30psi was as high as the controller would let me go. Overall was very happy with the numbers, and got some good data on ignition timing/VANOS adjustments for the manifold. (Also got some cool pictures shooting flames)
A few weeks ago I took it to it's first major race event, Battle Creek Speedfest 1/2 Mile Event. Last year on the twins setup I ran a best of 158mph (standing start 1/2 mile), so this year the goal was 160+mph. Well there is always some good competition there, so I had it turned up on kill mode (33 psi) and ended the day with a best 173.6mph from a standing start! Had a blast as always, meet a few new friends (including the owner of the Ferrari 488 GTB that I beat by about 1 car length) and definitely recommend the event to anyone in the midwest!
I had taken the car out to our local 1/4 drag strip a few times with some very disappointing results (mid 12's) due to my lack of ability to properly launch/slip the clutch. But finally last night I got my launch dialed in (with the help of @suspenceful and his videos) and ended up running a 10.7@135mph! I finally bought draggy before this, and loved the video it took also was very surprised how closely it matched my time slip. There's also the datalog from the run, showing 28psi on average with somewhat minimal timing corrections (I get some from NLS'ing)
Log from the pass is below for those interested:
Another shout out goes to @chadillac2000 for documenting his build so well, really helped me out building my manifold and his pictures are far better than mine. I'll add in a full mod list once I get some more time, but feel free to shoot me any questions!
Car is a 2007 E90 335i 6MT I bought with 130k miles after crashing my older E92. Went directly to FBO then upgraded twins setup in 2017. I enjoyed that setup for a while (~640whp on 26psi) however with less than 10k miles on them I developed intermittent smoking issues. After going unresolved from the manufacturer, I sent them back to be rebuilt and sold them. Back when I had my old E92 I had planned of building a single turbo manifold from the stock turbofolds but never got around to it, so I thought now would be the perfect time.
Over this past winter I build the manifold/hot side kit, swapped in a lower 80k mile longblock (old engine was still fine, just got a good deal on this engine and wanted to save mine for another project), and put in an XClutch organic twin disk. Below are some pictures of the manifold, but it's a pretty simple "log" style single scroll, utilizing a vband inlet turbine housing and stainless schedule 10 pipe. I have a good spreadsheet I'll link with a parts breakdown and price I paid for everything, but it was under $3000 considering I had alot of the parts/materials sitting in my garage.
And here's the link to the google spreadsheet for parts I used:
After I got it up and running well, got the calibration ironed out, I rented a local dyno for some dialing-in and numbers and ended up putting down 708whp (STD correct) on 30psi. I have cal'd it as high as 33psi, but I couldn't get enough load on the dyno to reach that boost so 30psi was as high as the controller would let me go. Overall was very happy with the numbers, and got some good data on ignition timing/VANOS adjustments for the manifold. (Also got some cool pictures shooting flames)
A few weeks ago I took it to it's first major race event, Battle Creek Speedfest 1/2 Mile Event. Last year on the twins setup I ran a best of 158mph (standing start 1/2 mile), so this year the goal was 160+mph. Well there is always some good competition there, so I had it turned up on kill mode (33 psi) and ended the day with a best 173.6mph from a standing start! Had a blast as always, meet a few new friends (including the owner of the Ferrari 488 GTB that I beat by about 1 car length) and definitely recommend the event to anyone in the midwest!
I had taken the car out to our local 1/4 drag strip a few times with some very disappointing results (mid 12's) due to my lack of ability to properly launch/slip the clutch. But finally last night I got my launch dialed in (with the help of @suspenceful and his videos) and ended up running a 10.7@135mph! I finally bought draggy before this, and loved the video it took also was very surprised how closely it matched my time slip. There's also the datalog from the run, showing 28psi on average with somewhat minimal timing corrections (I get some from NLS'ing)
Log from the pass is below for those interested:
Another shout out goes to @chadillac2000 for documenting his build so well, really helped me out building my manifold and his pictures are far better than mine. I'll add in a full mod list once I get some more time, but feel free to shoot me any questions!
