I have 81 240d 4spd with 617 out of 83 300sd...triple k turbo, 240d flywheel,
3" exhaust from turbo housing back, with muffler mounted in resonators location, boost gauge installed via alda line, pyro installed about 1.5" from exhaust outlet. Chain shows no stretch and pump timing in dead on, crisp throttle repsonse and quick spool up! The question is when under boost gauge shows 15psi+ I have seen 20psi at times. Pyro shows 800f with engine temp at 1/4 inch below 80...You can hear the boost in pressurize the intake and there is ZERO blowby... Oil level is dead on everytime and MPG is excellent...How long till turbo explodes as such high psi, but low pyro temps... I have also ran propane via ricer tube, with neat results and 950-1000f with ZERO blowby...How much can 617 handle? thank you

Ever seen the C111?

__________________
http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

Yes I have..I meant psi wise...the triple k sweet spot is 12-15psi correct? then if I have seen 20psi, which is wasted boost correct? The stock rings will handle 20psi or more? I'm limited by the rear end and 4spd but I have the rear end out of the 83 sd, have seen a ratio sheet and it seems the same if I remember....please correct me if I wrong. I have read tons of stuff and work on some of these, but I'm wondering if I make my own intake and exhaust manifold then I can add bigger turbo.. or more fuel hell something i dont know...just so fun to play with...and when it builds boost :fork_off:

What is the purpose of running such high boost levels?

You simply stress the head gasket much more than necessary without obtaining any more power.

I run 13.5 psi and it's overboosted at that level.

Did you adjust the boost level? If not check out your wastegate. If I am reading your post correctly one reason for your seeming low EGTs is the fact that you are measuring Post Turbo.

From egauges.com: "Now, there is much discussion about the actual placement of the probe, and if you have read our instructions, you will find that we recommend the probe be placed into the down pipe. This is the easiest place to mount the probe and the least likely to allow the entrance of shavings from drilling and tapping into the turbo (also referred to Turbo Outlet Temp). However, you have to keep in mind that on the AVERAGE, the temps will be between 300 and 400 degrees cooler than what is actually being inputted to the turbo itself.

That is why many people choose the more extensive, more involved installation method of placing the probe into the exhaust manifold. This method will offer you a more “realistic” idea of the true turbo temp, and a more “real time” reading of the temps."

__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

Yes I turned up boost, I understand placement of the pyro is dependent upon how well it reads...I wondering about relpacement with a larger turbo and self made intake manifold...so forth....I know the performance end has been discussed but im wondering about making performance pieces with reliability being a key factor...thnx