Author Topic: Turbo M42 Questions (Read 33949 times)

NisseJ�rnet · « **Reply #90 on:** May 03, 2010, 07:32:55 PM »

Quote from: bmwconnect;91849

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 ?

BMW OEM isnt that expensive

Quote from: Reap3r;91852

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.

I made my own.

bmwconnect · « **Reply #91 on:** May 09, 2010, 05:27:14 PM »

HG Let go finally. I spiked to about 21psi leaned out and all hell broke loose. I either cracked the head or HG is done. conclusion: 15psi is safe with a good tune

Ryann · « **Reply #92 on:** May 12, 2010, 12:16:36 AM »

I think the conclusion here is that excessive boost into a 10:1 stock CR engine is not going to last!

BlueBMW · « **Reply #93 on:** May 12, 2010, 06:46:33 AM »

key word... excessive! But reasonable boost should be attainable with some reliability.

NisseJ�rnet · « **Reply #94 on:** May 12, 2010, 11:04:29 AM »

Dynoed the is turbo yesterday, 280hp

I wanted more ouf of it but we had some problems with the MS at higer rpms, trigger errors i think so ill get back to that.
But i works really great below 6000rpm or so! Pretty fun

http://www.youtube.com/watch?v=I-ln2rVvzdE

bmwconnect · « **Reply #95 on:** May 12, 2010, 11:18:58 AM »

Quote from: NisseJ�rnet;92323

Dynoed the is turbo yesterday, 280hp I wanted more ouf of it but we had some problems with the MS at higer rpms, trigger errors i think so ill get back to that.
But i works really great below 6000rpm or so! Pretty fun

http://www.youtube.com/watch?v=I-ln2rVvzdE

what is your setup again? boost? can you post your timing map ?

Regards|

strypt · « **Reply #96 on:** May 12, 2010, 04:31:57 PM »

Quote from: NisseJ�rnet;92323

Dynoed the is turbo yesterday, 280hp I wanted more ouf of it but we had some problems with the MS at higer rpms, trigger errors i think so ill get back to that.
But i works really great below 6000rpm or so! Pretty fun

http://www.youtube.com/watch?v=I-ln2rVvzdE

Nice with more is turbo�s in Sweden =) How much boost are running? whp or crank hp?

NisseJ�rnet · « **Reply #97 on:** May 12, 2010, 05:57:36 PM »

Quote from: bmwconnect;92325

what is your setup again? boost? can you post your timing map ?

Regards|

Check your PM

NisseJ�rnet · « **Reply #98 on:** May 12, 2010, 06:01:23 PM »

Quote from: strypt;92343

Nice with more is turbo�s in Sweden =) How much boost are running? whp or crank hp?

Yeah, isnt it!

Should have produced more hp though

we had 200whp @ 0.8 bar boost but i think the downpipe is to restrictive or something, we tried 1.5 bar boost but didnt gain that much power

240whp @ 1.1bar i think. (should be around 280hp)

The DP and the trigger problem @ 6000rpm and above is two things i have to fix

Might check on the cams as well. I want at least 300whp and 7000rpm, shouldnt be a problem.

wazzu70 · « **Reply #99 on:** May 30, 2010, 04:38:58 PM »

Ryann, you don't know as much as you think. A LOT of reading is needed by you.

Also, stock internals can consist of a thicker head gasket to lower the compression ratio. FWIW here is what you can get with stock pistons/head and available gaskets:

.080” = 9.75:1
.098” = 9.34:1
.120” = 8.89:1
.140” = 8.52:1

I think a lot of people in this thread may want to follow my build:
http://www.e30tech.com/forum/showthread.php?t=89208

I am doing things as close to low budget as you can get which includes using the stock internals. I am going to be running a larger turbo than Rob is on the race car (Holset). I have a lot of experience working on and building race cars and I am interested to see what I can get. My goal is within what people are saying is impossible in this thread, so we shall see how it turns out. There is always the chance of failure though

FYI progress is slow as the car is an hour away from me and I have many things going on besides this hobby. Don't expect the engine to be finished quickly as I will be moving in stages. I am openly documenting things as well as I can though.

I am always amazed at peoples misconceptions about what an engine is capable of. Take the power goal and divide by the number of cylinders. 300/4 is only 75hp per cylinder. That's not really pushing any kind of limits or anything amazing. People will never achieve anything if people are always saying it can't be done.

bmwconnect · « **Reply #100 on:** May 30, 2010, 06:05:48 PM »

my 125cc dirtbike made 46hp on the lightest internals ever. even 100hp per cylinder should be no problem with a m42. cool project nick

wazzu70 · « **Reply #101 on:** June 01, 2010, 04:08:21 PM »

Quote from: Ryann;91674

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

Actually it's not. That's a seta motor, m20b25 is 8.8:1.

You can easily bend rods from too much power from boost in an FI motor. It's a common failure mode. Atmo engines tend to fail in tension.

You are a crack up man! Do you get your info from books written in crayon?

BlueBMW · « **Reply #102 on:** June 01, 2010, 06:15:29 PM »

Quote from: NickHertlein;93114

You are a crack up man! Do you get your info from books written in crayon?

Come now, lets keep it civil!

This thread has some good turbo information so we should keep it neat and clean!

wazzu70 · « **Reply #103 on:** June 02, 2010, 01:51:22 PM »

It has more completely incorrect info than correct info unfortunately. I highly recommend doing your own research from a legit source (aka not forums) before proceeding on your own project.