Author Topic: Turbo M42 Questions (Read 34013 times)

BlueBMW · « **Reply #60 on:** April 26, 2010, 05:38:28 PM »

Still want a turbo

Just saving the money now

And it seems like my car might be using a bit too much oil so a rebuild might be in the near future. (1 qt every 2-3 weeks seems a bit excessive... maybe not, I drive pretty hard)

bmwconnect · « **Reply #61 on:** April 26, 2010, 07:04:45 PM »

Quote from: BlueBMW;91494

Still want a turbo Just saving the money now And it seems like my car might be using a bit too much oil so a rebuild might be in the near future. (1 qt every 2-3 weeks seems a bit excessive... maybe not, I drive pretty hard)

I was burning a little also but then I switched to 20w50 and now it hardly burns any at all but the downfall is the long warm up time in the morning . my motor has 230,000kms on it

BlueBMW · « **Reply #62 on:** April 27, 2010, 07:00:57 AM »

I'm using the free stuff I get at work which is the BMW (castrol) synthetic 5w30, probably a bit thin considering I'm near 200,000 miles

Although I've had Zero external leaks using it so far!

kevins08 · « **Reply #63 on:** April 28, 2010, 03:41:55 AM »

lots of sketchiness in the thread....

BlueBMW · « **Reply #64 on:** April 28, 2010, 06:16:44 AM »

Turbos are a sketchy business....

bmwconnect · « **Reply #65 on:** April 28, 2010, 12:17:54 PM »

Quote from: kevins08;91591

lots of sketchiness in the thread....

The only sketchiness is how many people think you can't run high boost on pump gas and stock internals. example: stock talons run 30psi all day long at the track here and they don't even have forged internals and they are doing the 1/4 mile in high 11s on 94octance. At the end of the day its the good tune that will get you from point A to point B

Here is my list of mods for 18psi

t3/t4 hybrid 63trim turbo(ebay cheapy rebuilt with garret oil seals)
NGK Pro racing plugs temp rating 8
18degs timing at peak torque and 21degs across the board on 91 octane
Med size Intercooler
Metric Blue head 12.9gr bolts torqued to 80Lbs
36LB Injectors maxed out( not recommended lol )
Stock Motronic 1.7.2 tuned by me

kevins08 · « **Reply #66 on:** April 28, 2010, 07:36:25 PM »

Quote from: bmwconnect;91611

The only sketchiness is how many people think you can't run high boost on pump gas and stock internals. example: stock talons run 30psi all day long at the track here and they don't even have forged internals and they are doing the 1/4 mile in high 11s on 94octance. At the end of the day its the good tune that will get you from point A to point B

Here is my list of mods for 18psi

t3/t4 hybrid 63trim turbo(ebay cheapy rebuilt with garret oil seals)
NGK Pro racing plugs temp rating 8
18degs timing at peak torque and 21degs across the board on 91 octane
Med size Intercooler
Metric Blue head 12.9gr bolts torqued to 80Lbs
36LB Injectors maxed out( not recommended lol )
Stock Motronic 1.7.2 tuned by me

talons are also stock turbo'd and have a compression ration of what, 8:1 already? also take into account the reliability that DSM's are known for....

good luck with the ebay turbo...and a good tune makes all the difference in the world but have fun doing it with 36lb injectors and motronic at 18psi. it can be done but ill see ya down the road 10,000 miles.

bmwconnect · « **Reply #67 on:** April 28, 2010, 08:15:42 PM »

Quote from: kevins08;91630

talons are also stock turbo'd and have a compression ration of what, 8:1 already? also take into account the reliability that DSM's are known for....

good luck with the ebay turbo...and a good tune makes all the difference in the world but have fun doing it with 36lb injectors and motronic at 18psi. it can be done but ill see ya down the road 10,000 miles.

yes and a compression ratio of 8.5:1 at 30psi is a effective compression ratio of 25.85 :1 in boost VS 10:1 M42/ 22.24 :1 at 18psi . Every BMW I have touched its been a case of the motor was the last thing to fail and the rest of the car fell apart so I would say BMW/German motors are just as reliable.

Also I have been running a cheap ebay turbo that I rebuilt with Garrett seals and I have had zero problems for 30,000kms

Ryann · « **Reply #68 on:** April 28, 2010, 08:45:49 PM »

All we are saying is:

1. Your car isn't "300hp+"
2. It's not a good idea to boost a car @ 18 psi whose CR is 10:1

bmwconnect · « **Reply #69 on:** April 28, 2010, 09:06:28 PM »

Quote from: Ryann;91633

All we are saying is:

1. Your car isn't "300hp+"
2. It's not a good idea to boost a car @ 18 psi whose CR is 10:1

1. wrong. 15psi is around 300 crank hp with a good tune on pump gas
2. 18psi is a test and I never said it was a good idea. however 12-15psi on a good tune is easily done with this motor and will stay reliable

Ryann · « **Reply #70 on:** April 28, 2010, 09:20:31 PM »

1. 300hp+: SHOW US. The reason you won't is because you can't.
2. "Reliable" is an apparently subjective term.

bmwconnect · « **Reply #71 on:** April 28, 2010, 09:33:33 PM »

Quote from: Ryann;91637

1. 300hp+: SHOW US. The reason you won't is because you can't.
2. "Reliable" is an apparently subjective term.

I will get on the dyno as soon as I can and If you know the dynamics of boost and compression ratios you can easily work out that 14.7 psi will double your compression and will effectively double your stock HP.

When is the last time you have looked at the internals in the m42?

bmwconnect · « **Reply #72 on:** April 28, 2010, 09:38:08 PM »

by the sounds of it never!

Ryann · « **Reply #73 on:** April 28, 2010, 10:06:56 PM »

Even if the formula in your how-to book works the way you think it does, double your stock horsies is still only 268 dude.

While I haven't yet had to tear down my low milage m42, I HAVE rebuilt an m10, as well a slough of other high quality engines including multiple Isuzu 2.2 and Yanmar 2.3 diesels, a Toyota 22R, and a Datsun L24- not that looking at engine internals has anything to do with proper maximum boost pressure.

bmwconnect · « **Reply #74 on:** April 28, 2010, 10:20:34 PM »

Quote from: Ryann;91642

Even if the formula in your how-to book works the way you think it does, double your stock horsies is still only 268 dude.

While I haven't yet had to tear down my low milage m42, I HAVE rebuilt an m10, as well a slough of other high quality engines including multiple Isuzu 2.2 and Yanmar 2.3 diesels, a Toyota 22R, and a Datsun L24- not that looking at engine internals has anything to do with proper maximum boost pressure.

these motors are e36 140hp factory listed . however they make over 150hp or more NA tuned so that makes 300hp and formula used is a known fact and is a good base measurement. looking at the engine internals has everything to do with the proper maximum boost pressure or I would have bent rods at this point. I sure as hell wouldn't be running 18psi if I knew they were a standard non forged piston rod.

Forged crank stock
Forged Rods stock
4 Valves per cylinder flows very well
New combustion chamber designed to maximize squish and fuel mixing for a complete burn
Integrated piston oil squirters (very beneficial for boosting, cools piston crown)
Sodium Filled valves (once again dissapates heat, great for boosting)
Strong iron block
No timing belt to break
Very well balanced and likes to rev