Safe Boost for Stock M42 Motor?

[dcbrufan]

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!

[bmw318is1994]

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

[Vladi]

10PSI is safe with a good intercooler.
Nuvolarossa installed an M62 and with the stock crank pulley he had 10PSI. Check the other topics.

[sheepdog]

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.

[Vladi]

Yes, but no one stops you from using bigger injectors. :rolleyes:

[sheepdog]

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.

[Vladi]

I'll see that for myself in about two weeks.

[bmw318is1994]

bigger fuel pump and a fuel regulator along with bigger injectors man!! FTW!

[rob_e30]

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.

[ChItalian1027]

the DASC comes with 9.5psi

[Cobra Jet]

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
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.

[vatos_p]

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...