M42 Turbo Build (Semi Budget, keepng AC!) No 56k

[BUDNUNTA]

Im leaning towards the .140MLS over the o-ring
It slightly lowers the CR but are more prone to leak.
I think with the right RA On the mating surfaces and a nice flat block and head it wont leak
E36 people have ran 26psi with the MLS

Thankfully there are a bunch more m42turbos around
R&D





Hunter

[e30guydownunder]

O-ring... blow head gasket, top end or bottom end? Hmmm

For an engine that owes me $500 plus the expense of a headgasket, bolts and o-rings.... WHO CARES :p

[pbr87]

nice build!

[SamE30e]

O-ring... blow head gasket, top end or bottom end? Hmmm

[e30guydownunder]

E85 really is the shit for off the wall N/A builds (>14:1 CR) or high CR boosted builds.

It has cooling properties similar to methanol, high detonation threshold. Generally promoting more CR, more boost and somewhat of a misconception more ignition advance (this is entirely dependant on the actual engine and how it works as a system).

I'm going O-rings and bigger bolts straight out of the box, basically counting on winding my turbo out. I'm really keen for you to get to a dyno so we can see how you go with pump fuel!

[Schnitzer318is]

O yeah
This things sick.
Are you going to use one of those GM Solenoids for boost control?
With 46lb injectors im thinking the m42 is possible of 250whp or more with a stock bottom end.
The e36 guys are doing it.
.140MLS and APR2000 Head studs and crank that boost.

I wonder how long the baby diff will last?
Hunter

Yes, GM solenoid controlled by MS. I plan on running 12psi up to 4500rpm and then dropping to 10psi higher up to ease the strain on the head gasket. But if it does go, then you are right... new stock gasket, oringing, and arp studs = upping to 15psi all the way through the rev range.

sounds good mate, keep at it. I have some 1000cc injectors in the mail :D E85 and 18psi boost here i come

E85 sounds interesting. I have to do more reading on it as it seems to be the better fuel for boost. Though honestly this is a daily so I should keep it on the conservative side.

[e30guydownunder]

sounds good mate, keep at it. I have some 1000cc injectors in the mail :D E85 and 18psi boost here i come

[BUDNUNTA]

O yeah
This things sick.
Are you going to use one of those GM Solenoids for boost control?
With 46lb injectors im thinking the m42 is possible of 250whp or more with a stock bottom end.
The e36 guys are doing it.
.140MLS and APR2000 Head studs and crank that boost.

I wonder how long the baby diff will last?






Hunter

[Schnitzer318is]

LOL sorry guys, been enjoying the car a bunch now... got over 4000 on it since turbo went in, but have been holding off on vids. Reason being is I have a dyno coming mid december and just got some new parts to put in for more boost! :)

Got 46lb injectors and boost controller parts for MS going in which will allow me to reliably run 12psi! I am upping my rwhp estimate to 215. LOL though I'm not holding out much hope for longevity of the head gasket. :)

[xwill112x]

we keep waiting because turbo m42s are badass. lol

[e30guydownunder]

Why keep you guys waiting right?

[Schnitzer318is]

^LOL I have a camera... will take some for you. I was waiting until the 1/4 mile and the dyno to take vids, but I can always take more and post them up. Why keep you guys waiting right?

[iamsam]

why is there no video yet??? borrow someone's camera, and upload to youtube!! i want a idling/revving vid, a driveby vid, and a hard accelerating vid (all from the outside of the car)

[Schnitzer318is]

Just spoke to the guys at a local domestic performance shop (used to go there when I had my mustang). I know them well and was one of their first customers... lol feels so long ago, they've outgrown 3 shops now.

Anyway, they said they can tune it and will set me up with 5 hours of dyno time for $300. That's with the OG hookup of course. Sooooo looks like I'll be getting it dyno'd within the next month. :) Color me excited.

[e30guydownunder]

One of these bad boys


Thats the compressor map of the turbo I have. Pressure ratio is how much boost your running + atmospheric pressure (14.7) and the flow rate converts to roughly how much power the turbo can support at that pressure ratio. On 10.5 psi, my turbo in theory should support ~240bhp and be about 75% efficient at that stage. (Atleast thats what i think it all meant, did all this quite a while ago, the thread on bimmerforums was really helpful)

Would be interesting just to see how efficient you turbo is etc....i guess at the same time you will be able to work that out on the dyno, based on IAT's and the Area under the torque curve.

I have some 55lbs injectors so I should be right fuel wise :D

re: fresh engine, I don't have a choice, compression test came back at 120psi....which is well below the factory minimum in the bentley (~150psi) :crazy:

I'll stop cluterring your thread with my useless garbage now :)