Author Topic: Can M42 Handle 2 bar? (Read 9950 times)

futron.sim · « **Reply #15 on:** June 15, 2008, 10:39:01 PM »

Quote from: George77;51374

It must hold much more than that if you have a proper tuning and after market head blots.I'm planing to go 10psi veeeeeery soon,like next week.

Thats nice! Do tell us your results.

Btw, are you using standalone ECU or a piggyback. This is because I am trying to save some cash by using a piggyback like unichip instead of a standalone ecu.

Thanks!

strypt · « **Reply #16 on:** June 16, 2008, 01:58:01 AM »

I'm using the original bolts and headgasket with 1 bar boost (14.5 psi) and no problems so far. And that guy on youtube is also still using the original headgasket with 1.5 bar, dunno about bolts though. Like someone said, it isn't a problem if your tuning is good, detonations however will kill it fast.
I bet it can handle about 400 engine hp with ARP bolts before cylinder pressures becomes too high.

ClodKing · « **Reply #17 on:** June 16, 2008, 05:47:26 PM »

Quote

to overcome the poor low-end grunt, I am thinking of dual charging it. Using an Eaton blower to compensate for the low end.

I have been trying to plan this one out for a little while now (like a week).

I was trying to figure out how one could make the turbo take over where the supercharger stops, with out much over lap...

Plus there's plumbing, engine management, and where to put it all....

But still I've been thinking about it.

George77 · « **Reply #18 on:** June 16, 2008, 07:25:19 PM »

Whay don't you use two turbos,one small and one big,if you whant to go that BIG

George77 · « **Reply #19 on:** June 16, 2008, 07:27:25 PM »

i'm using emanage blue for fuel and spark with boost pressure sensor

futron.sim · « **Reply #20 on:** June 16, 2008, 09:01:01 PM »

Quote from: George77;51425

Whay don't you use two turbos,one small and one big,if you whant to go that BIG

I did thought about having twin turbos but my car is RHD so there isn't much space on the exhaust side. How I wish I could saw that @#$% steering column off lol.......

futron.sim · « **Reply #21 on:** June 16, 2008, 09:06:24 PM »

Quote from: ClodKing;51421

I have been trying to plan this one out for a little while now (like a week).

I was trying to figure out how one could make the turbo take over where the supercharger stops, with out much over lap...

Plus there's plumbing, engine management, and where to put it all....

But still I've been thinking about it.

I have also been planning for quite a while and trying to solve the issue of over lap. After some consulation etc, I think the best solution is to use a throttlebody. The intake will split into 2, 1 going to the blower and the other directly to the intake manifold (the TB will sit on this pipe).

The ECU will monitor the pressure in the pipe. once is has reach certain pressure. The TB will go WOT so air will bypass the blower.

vatos_p · « **Reply #22 on:** June 17, 2008, 01:11:35 AM »

i have been talking with a man in greece , who has a m42 engine installed in a E36 and uses it for Dragster , he is working with 2,2 bar pressure with only pistons - crank changed , arp head studs and produses 520 hp....he told me that M42 is very good engine for turbo applications and can handle much pressure and much abuse....

e30 4cyl · « **Reply #23 on:** June 17, 2008, 12:11:48 PM »

Quote from: futron.sim;51378

Wow! 30PSI on stock internals!

Yes, it was actually 27 psi and 359rwhp.

Here is the video: http://youtube.com/watch?v=PRvJQIMnPuM

And his dyno sheet and some build info: http://forums.bimmerforums.com/forum/showthread.php?t=567849

He is now building a turbo m30.

With your modifications 2 bar will be no problem. Who knows how high you will be able to go. 22 years ago bmw got up to 5.5 bar!

rob_e30 · « **Reply #24 on:** June 17, 2008, 01:52:49 PM »

Quote from: George77;51371

That's a good news ,but how many psi a stock head gasket with after market bolts of course can handle??

At least 14-15psi which is what we were running at the track last weekend.

futron.sim · « **Reply #25 on:** June 19, 2008, 02:33:26 AM »

Quote from: enildeR;51246

sorry. my post is off topic�
people say NA is bettAR than boost because when someone typically builds an engine with a turbo in mind, they make the CR around 8.5 or lower. This results in little or no low-end grunt. that and just so they can brag on the forums that they can drink beer out of their pistons. (I've seen it more than twice.)

you can build a great engine that has 11.5 CR with a turbo and still produce great power. you just have to have someone that knows a lot about engine mechanics and thermal efficiency to help you accomplish the task. people have done this in the past. it's not an impossible task, and if you do it right, you won't destroy your engine.

You still get the low-end grunt that makes driving a car in the canyons and through traffic fun without having to be near redline.

I have been thinking about what you mentioned and I think I may decide to go for a high compression engine and install a blower running at lower boost (say around 0.5-1 bar). This way, I can still get reasonable power and fuel consumption won't go too high.

Fuel prices have been going up like nobody business in my country. Now 1L of Shell V-power (that ~0.22 gallon) cost USD1.65. That means 1 gallon cost USD7.50

4o4ko · « **Reply #26 on:** July 09, 2008, 09:57:00 AM »

Quote

Now 1L of Shell V-power (that ~0.22 gallon) cost USD1.65. That means 1 gallon cost USD7.50

Thats pretty cheap

here - 0.22 gallon = $2.18 thats more then 10$ a gallon :mad: