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DISCUSSION => Swaps, Turbos, Buildups => Topic started by: dcbrufan on February 13, 2008, 09:18:15 PM

Title: Safe Boost for Stock M42 Motor?
Post by: dcbrufan on February 13, 2008, 09:18:15 PM: I am getting a M62 blower from ebay and going to install it into my E36. However, I am not sure whats the safe boost for me w/o blowing the engine.

Do you folks think its safe for around 10PSI of boost if I could ensure there is no detonation?

Btw, to increase the boost, I will be installing an intercooler (custom build a manifold for it) as well as a 2.8' pulley. Hopefully this will be able to hit 10PSI.

Thanks!
Title: Safe Boost for Stock M42 Motor?
Post by: bmw318is1994 on February 14, 2008, 07:08:03 AM: i would almost get an upgraded head gasket and a little head work done before trying to pull 10 psi...i know 6 is def. safe. That's the most I'd run through a stock M42. That's my $0.02
Title: Safe Boost for Stock M42 Motor?
Post by: Vladi on February 14, 2008, 07:30:58 AM: 10PSI is safe with a good intercooler.
Nuvolarossa installed an M62 and with the stock crank pulley he had 10PSI. Check the other topics.
Title: Safe Boost for Stock M42 Motor?
Post by: sheepdog on February 14, 2008, 12:55:33 PM: At 10 psi you may have fuel issues even with a reprogrammed chip.

I am with bmw318is1994, make sure your head gasket is good, maybe get the head cleaned up, and you may want to check oil pressure too.
Title: Safe Boost for Stock M42 Motor?
Post by: Vladi on February 14, 2008, 04:40:35 PM: Yes, but no one stops you from using bigger injectors. :rolleyes:
Title: Safe Boost for Stock M42 Motor?
Post by: sheepdog on February 15, 2008, 01:04:03 PM: Quote from: Vladi;42797
Yes, but no one stops you from using bigger injectors. :rolleyes:

That may not solve the problem.
Take a look at what Downing has done to get enough fuel. Bigger injectors can only work if the fuel supplied to them is enough.
Title: Safe Boost for Stock M42 Motor?
Post by: Vladi on February 15, 2008, 05:55:37 PM: I'll see that for myself in about two weeks. :D
Title: Safe Boost for Stock M42 Motor?
Post by: bmw318is1994 on April 04, 2008, 02:07:14 PM: bigger fuel pump and a fuel regulator along with bigger injectors man!! FTW!
Title: Safe Boost for Stock M42 Motor?
Post by: rob_e30 on April 04, 2008, 10:28:22 PM: More pressue isn't always the answer. I'm running the stock FPR, but with a custom ECU, higher flow rate pump and MUCH bigger injectors.
Title: Safe Boost for Stock M42 Motor?
Post by: ChItalian1027 on April 04, 2008, 11:23:30 PM: the DASC comes with 9.5psi
Title: Safe Boost for Stock M42 Motor?
Post by: Cobra Jet on April 08, 2008, 09:20:56 AM: don't forget a larger fuel rail also helps...

If trying to get more fuel (or modifying fuel system) based on the entire engine modifications or dynamics, you should take into consideration:

1) higher psi fuel pump
2) adjustable fuel pressure regulator
3) larger fuel rail(s) on engine
4) larger chassis fuel lines from tank to engine fuel rail
5) larger injectors
6) fuel pressure gauge to monitor fuel pressure while driving
7) possible MAF (or AFM) meter upgrade
8) O2 sensor upgrade
9) tuning if the engine has been radically modified and is now a HP monster

Along w/ more fuel, then you should improve air intake & exhaust:

10) larger throttle body (if applicable)
11) some type of CAI system
12) aftermarket performance header(s)
13) aftermarket better breathing cat back exhaust w/ hi flow cat converters

Many people don't get their vehicle "tuned" after performing all sorts of mods, especially when improving the fuel system and adding forced induction... If throwing tons of aftermarket parts at the engine and you're just installing stuff w/ no tune, you're not going to optimize your combo and there is the possibility of damaging the engine.
Title: Safe Boost for Stock M42 Motor?
Post by: vatos_p on April 18, 2008, 03:45:21 AM: i am already running succesfuly 0.5 bar of a almost 20.000 km , with no problems , i have 2 extra injectors ( the engine is stock , injectors stock , afm stock ech... ) the extra injectors controled by SMT-7 , BIGGER EXHAUST ( 65mm ALL THE WAY ) , custom made exhaust manifold , and all the rest stock... the dyno gave me 200.5 HP , and 25,4 kg torque...but 0,5 bar is limit pressure for stock engine...