m50 FI FAQ??? and flywheel bits issues????

[rezhak]

Hello guys,

i bought a used Competition Clutch ( hope someone knows this brand LOL) flywheel in very good shape for dirt cheap, but it didnt bring the pressure plate assembly and disk... Can i use the stock s50b32 pressure plate and clutch disk and TOB aswell?

btw im going FI in my m50b25 with athena gasket and arp studs, i got myself a gt3037 with 0.63 ar for cold side and 0.82ar for hot side and would like to know whats the safest boost level for 9.5 cr?
Im aiming for the 400hp crank is it possible with this combination?

Thanks :)




Sorry about the focus... My phone is complete garbage lol :P Btw its stock bottom end. It only has girdle ARP heads and Athena 2 mm.
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[someguy2800]

Is this what you bought?

https://www.ebay.com/itm/COMPETITION...-/330920688317

I did a part number search for the pressure plate from a euro S50b32 and its the same part number as the US S52b32 pressure plate, which I know would fit on that flywheel.

http://www.realoem.com/bmw/enUS/part...065&series=E36

Is that turbo the same as a gt3076R? With 9.5:1 compression and the good octane petrol you have in Europe you should be able to safely run about 450 whp as measured by a dynojet, which is about 520 at the crank or so. I would expect it to take about 17 or 18 lbs of boost to do that. I think at that point you'll start running into backpressure issues with the small turbine on the turbo. An unrestrictive exhaust after the turbo will help with this. It will live forever at 14 lbs of boost and 400 whp. With a turbo upgrade in the future and meth injection you could push it further. You'll probably need a better clutch than a stock s50 clutch if your going to turn it up past 7 or 8 lbs of boost, which you will. Plan for more power now than you think you want to avoid buying the same parts 2 or 3 times.

[vollosso]

/thread


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[rezhak]

Is this what you bought?

https://www.ebay.com/itm/COMPETITION...-/330920688317

I did a part number search for the pressure plate from a euro S50b32 and its the same part number as the US S52b32 pressure plate, which I know would fit on that flywheel.

http://www.realoem.com/bmw/enUS/part...065&series=E36

Is that turbo the same as a gt3076R? With 9.5:1 compression and the good octane petrol you have in Europe you should be able to safely run about 450 whp as measured by a dynojet, which is about 520 at the crank or so. I would expect it to take about 17 or 18 lbs of boost to do that. I think at that point you'll start running into backpressure issues with the small turbine on the turbo. An unrestrictive exhaust after the turbo will help with this. It will live forever at 14 lbs of boost and 400 whp. With a turbo upgrade in the future and meth injection you could push it further. You'll probably need a better clutch than a stock s50 clutch if your going to turn it up past 7 or 8 lbs of boost, which you will. Plan for more power now than you think you want to avoid buying the same parts 2 or 3 times.

Yeah thats exacly the flywheel i got!
So if i want about 450rwhp i need to get a better clutch than s50? hmm which one do you recommend? since im doing this in kinda of a budget i dont want to go further than 300 for a pressure assembly.. but if i must then i might aswell spend a little more to get things done right. Btw ill post some pics of what ive done to my engine later...
And btw xD which size for wastegate do i need? ive ordered a 38mm tial style.

Thanks :)

[someguy2800]

There is now way a stock m3 clutch will hold that. They are not any better than a m52 clutch. Lots of people have good luck with these up to 500 whp

http://vi.raptor.ebaydesc.com/ws/eBa...22106000&ver=0

- - - Updated - - -

Wastegate will depend on what manifold your going to use. Does tial style mean Chinese crap? If there is any two parts in your build that should be quality name brand parts it should be the wastegate and fuel injectors.

[rezhak]

There is now way a stock m3 clutch will hold that. They are not any better than a m52 clutch. Lots of people have good luck with these up to 500 whp

http://vi.raptor.ebaydesc.com/ws/eBa...22106000&ver=0

- - - Updated - - -

Wastegate will depend on what manifold your going to use. Does tial style mean Chinese crap? If there is any two parts in your build that should be quality name brand parts it should be the wastegate and fuel injectors.

Oh well, hmm what do you recommend for both? (sorry for all the questions but since you are helping me im gonna ask all the things i didnt know :P)
i was thinking siemens deka 630cc... Do you thnk they are fine?
My manifold is from ebay... I have no shame saying so. it was pretty cheap but since my dad can do metal work very well we got to fortify the manifold b4 using it.

I think theres a dealer from the flywheel i bought in my country ill try to contact them and ask about the pressure plate and disk, its not that i dont want your option but the customs in my country are complete thiefs which charge almost 50% of the cost of the item with shipping included... so i try to buy everything from within Europe or my country. And thats why ebay.... but i have some parts dealers here that can get me a hks for reasonable price.
Just need to know which diameter is the best for my setup... Pls? XD

Thank you very much for all your help

[someguy2800]

You need to look at the manifold you have to see what size port it has on it. Most are made for a 38mm gate which usually mounts with 2 bolts, or 44 mm gate that mounts with a V-band. What are you doing for tuning? All the stock ecu tuners in the US will provide a MAF and injectors to match there tune. If your tuning yourself 630cc siemens deka are fine and will support 600 whp or so. I believe a lot of people in Europe use a Sachs performance pressure plate with either a stock disc or a 6 puck ceramic disc. I would ask around about that. I don't remember what the part number is. In the US they are the same price as just buying a clutch kit from somebody so I don't think I've ever seen anyone using them here.

[rezhak]

You need to look at the manifold you have to see what size port it has on it. Most are made for a 38mm gate which usually mounts with 2 bolts, or 44 mm gate that mounts with a V-band. What are you doing for tuning? All the stock ecu tuners in the US will provide a MAF and injectors to match there tune. If your tuning yourself 630cc siemens deka are fine and will support 600 whp or so. I believe a lot of people in Europe use a Sachs performance pressure plate with either a stock disc or a 6 puck ceramic disc. I would ask around about that. I don't remember what the part number is. In the US they are the same price as just buying a clutch kit from somebody so I don't think I've ever seen anyone using them here.

My manifold doesnt have wastegate port because (just my opinion) i think if its from ebay, then the less holes on it the less chance i get from it cracking xD
i have megasquirt 2 for the management with map sensor and bosch lsu wideband.
i checked that sachs performance clutch and they will send me a 600nm setup for the flywheel i got
do you think if i keep 38mm i will be able to go from 8 psi to 17 psi so i can make low boost and high boost tune?
my manifold is same as this one https://www.ebay.com/itm/T3-Facherkr...MAAOSwbtNZ8aFL
it came from germany but its still chinese, but from all the others it looked as the one that had best finish to the welding and some quality... still chinese though
i watched some dudes on youtube welding the wastegates to the exhaust housing of the turbo... Opinion?

Thx for all the help once again

[someguy2800]

It will completely depend on how smooth an entrance into the wastegate you can make. I think looking at that manifold you would probably be best off putting it on the turbine housing. I don't think there will be any other decent place to put it with that manifold and priority flow to the wastegate. A 38 will be fine if you make a smooth transition into it. Put the wastegate parallel to the exhaust flow, not at a right angle. Make sure to research how to weld onto cast iron.

[rezhak]

It will completely depend on how smooth an entrance into the wastegate you can make. I think looking at that manifold you would probably be best off putting it on the turbine housing. I don't think there will be any other decent place to put it with that manifold and priority flow to the wastegate. A 38 will be fine if you make a smooth transition into it. Put the wastegate parallel to the exhaust flow, not at a right angle. Make sure to research how to weld onto cast iron.

Do you know how much power/boost does the stock m50b25 can handle at 9.5 cr with 98 octane (just a estimate?) only with the athena gasket and arp studs?
i would like to know so i can start looking at a decent diff, because my current one is from a 320i (it was what i found at that time) and i dont think it will hold more than 300whp.
Its not like i will beat it like hell but i would like something that would last at that power level. btw my trans is a getrag from a e34 525i with custom driveshaft. opinion on this box?

thx

[someguy2800]

If everything is done right with a big turbo and meth injection, 30 lbs. With your turbo and no meth injection, 15 -18 psi. Depends on how bad the back pressure is. Transmission is fine, rear end and axles have to go.

[rezhak]

If everything is done right with a big turbo and meth injection, 30 lbs. With your turbo and no meth injection, 15 -18 psi. Depends on how bad the back pressure is. Transmission is fine, rear end and axles have to go.

what do you recommend for diff and axles?

[vollosso]

what do you recommend for diff and axles?

He doesn't like bmw rearends. If its up to him youll have a 9" and beadlocks before the end of the week.

And he is probably right.


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[someguy2800]

He doesn't like bmw rearends. If its up to him youll have a 9" and beadlocks before the end of the week.

And he is probably right.


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Correct, the way god intended things to be.

what do you recommend for diff and axles?

Get the whole rear subframe, diff, and axles, hubs, ect... from a 328i or 325i as a minimum. If you can find the parts from an M3 for a reasonable price all the better. While you are swapping it out there is some reinforcing people usually do the subframe. I don't have an E36 so I don't know anything about it.

[Kevin325i]

There are plates that get welded in to the four points where the subframe mounts.

If you search e36 subframe reinforcement in Google you should get the OE plates from various vendors.

[rezhak]

There are plates that get welded in to the four points where the subframe mounts.

If you search e36 subframe reinforcement in Google you should get the OE plates from various vendors.

yeah ive heard of those plates once and i noted the part number from bmw somewhere... just need to find it now...

[Kevin325i]

Here you go. Pictures and part numbers if you scroll down.

https://www.turnermotorsport.com/p-3...forcement-kit/

Not sure the most cost effective way to get them your way. They could be made if you have tools and some sheet steel.

[rezhak]

Correct, the way god intended things to be.



Get the whole rear subframe, diff, and axles, hubs, ect... from a 328i or 325i as a minimum. If you can find the parts from an M3 for a reasonable price all the better. While you are swapping it out there is some reinforcing people usually do the subframe. I don't have an E36 so I don't know anything about it.

I at the moment dont have the "funds" to swap out the rear subframe but i will in the future... meanwhile i got a e34 525i rear diff for free, do you think i can swap the internals with the e36 320i diff? i think they are diferent sizes but maybe?

[someguy2800]

not going to work. Beat on the 4 cylinder diff until you run over it.

[rezhak]

not going to work. Beat on the 4 cylinder diff until you run over it.

What about diesel rearends? here in europe we have those everywhere

[someguy2800]

No idea

[rezhak]

Got my pressure plate and disk today... got a sachs racing kit, but i asked for a single mass and they still sent me a unsprung disk 4 puck... will this affect driveability? i dont plan on dd with this car but still...??

[someguy2800]

It will be fine. Might make some gear rattle noise at idle

[vollosso]

I prefer unsprung eh


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[rezhak]

some gear rattle... hmm..... well because racecar, right?

btw do you guys know what can i do about my icv plumbing because of the boost? will it tear apart or possibly leak?
whats your opinion on this? Do i keep the valve or do i get rid of it?

thx