Author Topic: Turbo M42 Questions (Read 33932 times)

Ryann · « **Reply #75 on:** April 28, 2010, 10:42:04 PM »

NO, you wouldn't have bent rods. Bent rods are caused by the cylinder being filled with something that doesn't compress, like water or liquid fuel. It's called hydrostatic lock. You're on your way to having collapsed pistons, sloppy wrist pins, and hammered bearings. These things are caused by knock, which means your combustion gases are detonating and expanding due to compression while the piston is still on it's way up.

We all agree that the m42 has tough internals and is a prime candidate for turbocharging.

bmwconnect · « **Reply #76 on:** April 28, 2010, 11:01:28 PM »

Quote from: Ryann;91644

NO, you wouldn't have bent rods. Bent rods are caused by the cylinder being filled with something that doesn't compress, like water or liquid fuel. It's called hydrostatic lock. You're on your way to having collapsed pistons, sloppy wrist pins, and hammered bearings. These things are caused by knock, which means your combustion gases are detonating and expanding due to compression while the piston is still on it's way up.

We all agree that the m42 has tough internals and is a prime candidate for turbocharging.

So are you implying that hydrostatic lock is the only way to bend rods?

I don't have any detonation because It's tuned well.

I own one of the top engine tuning forums in the world and your trying to tell me about detonation, and hydrostatic lock lol please. I have seen/tuned more motors then you could ever imagine

Ryann · « **Reply #77 on:** April 28, 2010, 11:20:04 PM »

Nope. Only the most common.

I think you're the only engine tuning master in the world that doesn't have access to a dyno.

Warsteiner · « **Reply #78 on:** April 29, 2010, 06:09:19 AM »

I think that everyone is great and knows a lot. But does anyone know about this??

http://www.youtube.com/watch?v=MXW0bx_Ooq4

I say let bmwconnect test the stock internals all day long. At least then you'll all know what it takes our motors to fail and under what intense conditions. NO?

Going on about a 17% drivetrain loss.
Rob was making 300RWHP which is like 350-355 CRANK HP.

300 CRANK HP is only about 255 RWHP. BIG difference. Getting to that 300HP at the crank is tough, but it's even harder getting past that mark and going up to 350+.

Kudos to Rob for building an awesome car. If bmwconnect does have what he says he does, than so be it.

Why doesn't anyone think this is possible? I don't know anything about the differences between Turbos and Supercharger but I've personally seen a 10.5 compression 2.3L car with SC, on a dyno in front of me, make 316 Crank HP on only 6-7psi. Not sure if this can even be added to the conversation mix but it was really cool to see a stock 192HP motor go to 316HP with such little effort. To boot, this was on a stock internal motor that had 216K miles on it!

Enjoy the vid......

Warsteiner · « **Reply #79 on:** April 29, 2010, 12:29:13 PM »

Also... just remembered of a friend who ran 18psi on stock internals on a M20 with no issues. Can it be done ....yes. Is it safe?...only the tuner knows:)

Ryann · « **Reply #80 on:** April 29, 2010, 08:45:50 PM »

The stock CR for an m20 is only 8.5:1.

Warsteiner · « **Reply #81 on:** April 29, 2010, 10:07:17 PM »

Well that sure as Sh$t helps explain a lot doesn't it!!:eek:

bmwconnect · « **Reply #82 on:** April 29, 2010, 11:10:15 PM »

car is still running strong. Having problems with idle control valve hoses cracking under boost pressure and leaking boost. lots of fun otherwise

nuvolarossa · « **Reply #83 on:** April 30, 2010, 01:47:34 AM »

Quote from: bmwconnect;91687

car is still running strong. Having problems with idle control valve hoses cracking under boost pressure and leaking boost. lots of fun otherwise

http://www.youtube.com/watch?v=M38uEQetPKU
http://www.youtube.com/watch?v=f6pkow5hti4 :p

rob_e30 · « **Reply #84 on:** April 30, 2010, 10:03:13 AM »

Quote from: nuvolarossa;91693

http://www.youtube.com/watch?v=M38uEQetPKU
http://www.youtube.com/watch?v=f6pkow5hti4 :p

Got dyno?

bmwconnect · « **Reply #85 on:** April 30, 2010, 02:03:00 PM »

snapped the lower offset differential bolt today. replaced with grade12.9 bolt and seems to be fine now . I fear the next thing to break is the sub frame mounts

bmwconnect · « **Reply #86 on:** May 01, 2010, 08:23:29 AM »

raced a 300whp VW carrado last night, he had me by a car length or so. now I know I'm making good power

Reap3r · « **Reply #87 on:** May 02, 2010, 06:49:42 AM »

Quote from: nuvolarossa;91693

http://www.youtube.com/watch?v=M38uEQetPKU
http://www.youtube.com/watch?v=f6pkow5hti4 :p

Is it just me or does that 0-100 seem dissapointing? Could it just be because its in a e36 I'm guessing. I was out in a R32 last night that was only making 199rwhp and it seemed faster and similar weight to a e36.

bmwconnect · « **Reply #88 on:** May 02, 2010, 10:19:13 PM »

new problem! blew out one of the exhaust gaskets at the header. I suspect the cheap ebay turbo manifold is not seating well. Anybody know where I can pick up those M7 studs & bolts for a decent price ?

Reap3r · « **Reply #89 on:** May 03, 2010, 12:46:30 AM »

Quick question, what manifolds is everybody using? I've got a ball bearing t3 turbo off a skyline r32 gtst which im getting a steel exhaust wheel for. Theres a couple of manifolds on the UK Ebay but not sure on what peoples luck is with these manifolds fitting on a E30. At the moment I'm steering towards a 666 fab mani purely because I know its good quality and will fit.