1990 vs 80s turbo differences - PeachParts Mercedes-Benz Forum

chomamma · #1 09-17-2007, 02:19 AM

Looking for a turbo to replace the one in a 1990. It is a garrett 2535 I believe. Will those from a mid 80s fit? I know the waste gates are different. Anything else?

#2 09-17-2007, 02:24 AM

No, it's a completely different turbo. The only model that will fit yours is a 1987 190D 2.5T.

chomamma · #3 09-17-2007, 02:32 AM

Thanks. They are bit hard to find. I had rebuilt mine. Spins nice, but cant get any boost. I am replacing my intake gasket and will test boost again. Not sure why it wont spin up. Wastegates closed. Since I have no boost, I therefore get no more fuel.

Deni · #4 09-17-2007, 02:44 AM

Will a turbo from a 300D (87 onwards) fit?

greasybenz · #5 09-17-2007, 02:49 AM

i think they are computer controlled so it might not work with a 87 turbo.

#6 09-17-2007, 02:49 AM

No. You have a T25, the (real) 300D uses a T3.

greasybenz · #7 09-17-2007, 02:51 AM

Quote:

Originally Posted by ForcedInduction

No. You have a T25, the (real) 300D uses a T3.

ahh forgot the 5 vs 6 cyl differences.

chomamma · #8 09-17-2007, 02:56 AM

Is the T3 a different size compressor outlet?

#9 09-17-2007, 03:05 AM

Different size turbo altogether.

Deni · #10 09-17-2007, 03:14 AM

Quote:

Originally Posted by ForcedInduction

Different size turbo altogether.

Si can't go to the junk yard, grab a turbo from a real 300D and bolt it on my om602?

mcguirjf · #11 09-17-2007, 12:59 PM

I purchased an engine from a 1987 190DT to put into my 1990 300D and noticed a few differences. One, the compressor wheels are different and two you have to plug the boost line out of the compressor housing. I was also found that the A/R is slightly different .41 to .43. See attached photos.

Tymbrymi · #12 09-17-2007, 02:06 PM

Quote:

Originally Posted by chomamma

Thanks. They are bit hard to find. I had rebuilt mine. Spins nice, but cant get any boost. I am replacing my intake gasket and will test boost again. Not sure why it wont spin up. Wastegates closed. Since I have no boost, I therefore get no more fuel.

It sounds like you are in "limp home" mode. The computer controls the wastegate on that turbo, and if the computer finds something wrong with the EGR, throttle plate, airflow sensor, or rack position sensor (I'm sure there are more) the computer opens the wastegate... so no boost.

Have you disabled your EGR or anything like that? Make sure all the vacuum lines running to all those actuators aren't leaking.

HTH!

chomamma · #13 09-17-2007, 04:40 PM

I have disable teh EGR and afr. Not sure about the computer controling the vaccume on teh waste gate. Interesting. I'll pull the vacume line off and hold a vaccum with the might vac and give it a ride. Dont think I'll see any change though.

Tymbrymi · #14 09-17-2007, 04:47 PM

Quote:

Originally Posted by chomamma

I have disable teh EGR and afr.

You're in limp home mode then. If your mityvac holds vacuum on that wastegate actuator (ie, it doesn't leak down), you might end up creating an overboost condition.... so don't drive too hard.

chomamma · #15 09-17-2007, 05:05 PM

You guys know which vacuume valve works the EGR or the other butterfly valve on the intake manifold?(cant remember the name) I put them back on again and see If I notice anything different.