[AlpineSwift]

/\ Just not the N52. Otherwise you'll end up calling your car "Kaboom" which is the same sound your engine will make when you hit the dyno with boost.

[papajetta]

This thread was very interesting ....until it got contaminated on the lower half of the first page with useless bickering....
I myself am very curious how far and how much would turboing a base n52 on 6-8 psi. Getting a 335 would be quicker and make more sense on the surface of this dilemma, but sometimes it's not as simple. I have a touring and there are no touring 335s in the US. A 335 swap on my touring would be far more expensive and intricate than a turbo kit. Would have to add all the components for direct injection and all plumbing for the hpfp.... To begin. Bolting up a n55 manifold with the stock turbo and stock air cooling components sounds more realistic than a pipe dream. Fuel can be managed the old way.... Bigger injectors and a tune, maybe upgrade the fuel pump to a walbro high flow.... Stock ignition map from a 335.... Hopefully I can revive this thread and turn it into something useful and informative.

[hassmaschine]

then stop talking about it and do it. Except you won't. You will realize like everyone else that there isn't any point.

we already know what an N52 will do on 6-8 PSI. you will run out of injector at about 290whp. If you somehow got larger injectors that worked with valvetronic (not as simple as you think), you would probably crack a piston in half or throw a rod much above that anyway.

Copying the ignition map from the N54 would be the least of your worries. Walbro fuel pump.. lol.

[CobraMarty]

Nothing catastrophic has happen with 6-8 pounds of boost. Yes you will run out of fuel/injectors. Ignition timing also has a solution. No concerns about cracking a piston or throwing a rod above that as you are not running boost above 6-7 pounds. This 'low boost' will still add 35-40% more power. Just don't expect more.

Use a single 60-80 pound auxiliary injector or 6 smaller 17lb/hr port injectors and run them with an auxiliary injector controller. Sort of a stand alone fuel system for only during boost. Split Second also has a boost timing control box that intercepts the cam and crank position sensors and delays them to retard timing under boost. Both the AIC and the Timing controller are fully programmable with value vs. manifold boost. These will only work under boost, not during NA. During NA the stock motor/ecu/injectors will operate normally as engineered.

Already have a N55 turbo/exhaust manifold and down pipe, exhaust adapter plate, N52 head, N55 IC, PI plate/injectors/controller. Now just need a N52 block.

[DigiDon]

I'm turbo..... GT35R single turbo, 85lb injectors, AEM FIC, E85 Fuel, 3" Downpipe to 4" exhaust to dual 3" at rear axle, AEM wide band gauge, Turbo Smart boost controller, low boost 9psi, mid boost 11psi, high boost 13psi.

Never dynoed but figure in the 420hp range on mid boost. Drive with a couple of friends with M4's. Barely beat stock M4's and barely get beaten by JB4 equipped M4's.

Its my daily driver, been turbo for about a year now. Still holding together "knock on wood...Pray to god" lol.

I do have a broken second gear at the moment, and have gone through multiple clutches.

https://www.youtube.com/watch?v=EDUUdmmo-D0

[Mike.]

Originally Posted by DigiDon

I'm turbo..... GT35R single turbo, 85lb injectors, AEM FIC, E85 Fuel, 3" Downpipe to 4" exhaust to dual 3" at rear axle, AEM wide band gauge, Turbo Smart boost controller, low boost 9psi, mid boost 11psi, high boost 13psi.

Never dynoed but figure in the 420hp range on mid boost. Drive with a couple of friends with M4's. Barely beat stock M4's and barely get beaten by JB4 equipped M4's.

Its my daily driver, been turbo for about a year now. Still holding together "knock on wood...Pray to god" lol.

I do have a broken second gear at the moment, and have gone through multiple clutches.

https://www.youtube.com/watch?v=EDUUdmmo-D0

Very interesting. Looks like a beast.

Couldnt use a 335i clutch?

[rick100]

Just when everyone was saying it's not possible to do it.. lol

Still makes more sense to buy a 335 if turbo is the you want to go but it is possible.

I'm wondering g what would be the cost to install one

[hassmaschine]

It will break.. Eventually. Nobody said it couldn't be done, but its not a good idea.

[DigiDon]

Originally Posted by Mike.

Very interesting. Looks like a beast.

Couldnt use a 335i clutch?

Thank You, yes it's a huge difference in the fun catagory, I'm Loving it.

I pretty much figured out the clutch. Made my flywheel solid mass, then made a 4 puck clutch disc, used a non adjusting pressure plate from an E36. Works great.

I've been trying to figure out the tranny, figured out an N54 manual tranny will bolt in and bolt up to the driveshaft. Also is cheaper than the N52 manual tranny, I think because manual N52's are much more rare than N54 manuals (speaking strictly used trannys).

Problem now is I'm probably gonna need to get an N54 clutch setup with flywheel to work with the N54 tranny..

Originally Posted by hassmaschine

It will break.. Eventually. Nobody said it couldn't be done, but its not a good idea.

Yep you are correct, everything eventually breaks.... high pressure fuel pumps break, high pressure fuel injectors break, turbos break, and those are OEM BMW....

I know this will eventually break because I keep turning up the boost, but I really want to see what it will handle. I believe it will handle over 20psi of boost and about 600hp....

Not saying this is for everyone. If you look on my youtube video in the comments section I answer some questions about this kit and I pretty much say get a 335 or the ESS supercharger kit. Especially for daily drivers. WIth that said I'm really confident that if someone turboed this engine and kept it at around 8psi on pump fuel on a good tune and serviced it properly it would last the life of the vehicle.

[hassmaschine]

What psi are you at now? I'd love to see a dyno. The N52 should flow a lot better than an N54, aside from longevity issues it could theoretically make more power than an n54 at a given boost level.

If you really want to take it to the next level, the bottom end could certainly be built up for boost. Stronger rods, pistons with thicker ring lands, etc. Actuall I think you could bolt the N52 head right on an n54 block. That would be interesting for sure!

N54 trans should bolt right up, you can use an N54 clutch disk but you need a different flywheel. N52 is 6 bolt, n54 is 8. But a single mass flywheel for the n52 should work fine.

[Dan Bilzerian]

So you had to make a custom manifold or was there one that could just bolt up? I'm really amused by this lol! What are some torque numbers? (rough estimate)

[DigiDon]

Originally Posted by assmaschine

What psi are you at now? I'd love to see a dyno. The N52 should flow a lot better than an N54, aside from longevity issues it could theoretically make more power than an n54 at a given boost level.

If you really want to take it to the next level, the bottom end could certainly be built up for boost. Stronger rods, pistons with thicker ring lands, etc. Actuall I think you could bolt the N52 head right on an n54 block. That would be interesting for sure!

N54 trans should bolt right up, you can use an N54 clutch disk but you need a different flywheel. N52 is 6 bolt, n54 is 8. But a single mass flywheel for the n52 should work fine.

I drive around on 9psi daily, and usually use mid boost 11psi when running someone.. use 13psi on occasion but seems like the stock fuel pump has a hard time keeping up at that boost level. I'm adding an inline pump in the tank this week, so should give me 50% more fuel volume. Basically doing the same in tank fuel setup as the N54 guys. The N52 in tank pump is same as N54 in tank pump, same part number, is believed to be in the 350lph range.

Yes these heads definitely flow better, CNC ported from factory vs the cast non ported N54 heads, and higher compression. Same turbos and boost for boost the N52 hands down makes more power than an N54.

I have been looking at block replacement options and think the N55 block might be a better option than N54 but N54 may also work. The problem is the accessories for example a/c compressor is on opposite side. I am running the oil filter stand from an N54 which allowed me to run an N54 oil cooler on the N52 so maybe some things may just bolt up. I do know all three head gaskets N52, N54, N55 are pretty much the same, the bolt holes line up the piston openings line up and most water and oil ports line up. So pretty sure the heads can bolt onto all three.

Been also looking into the flywheel/clutch setup and found the newer N54 Flywheels are 6 bolt and N55 flywheels are 6 bolt so those would work with N52. The N52 flywheel diameter is too small to work with N54 clutch, tried that one already and failed lol.

Also am working out the blow off valve problem, these engine have no vacuum so blow off doesn't work, but found an electronic Blow off valve controller made for diesels by Turbo smart that may solve that problem.

I will try to post more often to keep you guys up to date on whatever I find works and doesn't work. I'm just not on the forums that often. I joined this forum I think in 2007 when I first started this project and when I had zero kids, now I have 4 kids.. soooo have my hands full sometimes.

check out my first post about this car
http://www.e90post.com/forums/showthread.php?t=81727

[Jerooo]

What are you doing for larger injectors? From what I read that is the limiting factor for most of the guys with super chargers that want more power.

[Ruddigger]

Man you got a lot of haters in that thread. I would post your progress in there, if I was you.

[NeurotoxicSpork]

That thing is amazing. Any chance you'd do a build writeup?

[DigiDon]

Originally Posted by Jerooo

What are you doing for larger injectors? From what I read that is the limiting factor for most of the guys with super chargers that want more power.

Using these guys http://www.racepartsolutions.com/ind...part-solutions from race parts solutions. Working perfect for me so far. They plug in to stock connectors and bolt right in, they are just a little longer so I used some fuel rail spacers and longer fuel rail bolts and good to go.

Originally Posted by Ruddigger

Man you got a lot of haters in that thread. I would post your progress in there, if I was you.

Yep, probably a good idea. Maybe I should also start a new thread with what I've done so far. Bump for my 9 year old thread lol..

[Eagle1oh7]

Wow! I'm very curious about the injectors solution!

[justpete]

Originally Posted by DigiDon

I'm turbo..... GT35R single turbo, 85lb injectors, AEM FIC, E85 Fuel, 3" Downpipe to 4" exhaust to dual 3" at rear axle, AEM wide band gauge, Turbo Smart boost controller, low boost 9psi, mid boost 11psi, high boost 13psi.

Never dynoed but figure in the 420hp range on mid boost. Drive with a couple of friends with M4's. Barely beat stock M4's and barely get beaten by JB4 equipped M4's.

Its my daily driver, been turbo for about a year now. Still holding together "knock on wood...Pray to god" lol.

I do have a broken second gear at the moment, and have gone through multiple clutches.

https://www.youtube.com/watch?v=EDUUdmmo-D0

Damn. This is legit. No telling how long those poor weakass pistons will last but it'll be a blast until then. Nice work!

[GSTiDDY]

Very nice! NFILTHY2

[W37V]

Originally Posted by DigiDon

Using these guys http://www.racepartsolutions.com/ind...part-solutions from race parts solutions. Working perfect for me so far. They plug in to stock connectors and bolt right in, they are just a little longer so I used some fuel rail spacers and longer fuel rail bolts and good to go.



Yep, probably a good idea. Maybe I should also start a new thread with what I've done so far. Bump for my 9 year old thread lol..

Please do. I'm very curious about all this. Saw your videos while back. I had hard time believing they were real.

[DigiDon]

Ok started a new thread.

http://www.e90post.com/forums/showth...6#post19353736

[CobraMarty]

Oh, Look here. BPC turbocharged a N52 and made 350rwhp with 6-7 pounds boost.

http://www.e90post.com/forums/showthread.php?t=1290576