need more diesel power - Page 2 - PeachParts Mercedes-Benz Forum

Brian Carlton · #1 03-20-2007, 07:06 PM

Quote:

Originally Posted by juggernaut

. but dont worry, i rarely bring it up past 17-18 psi. if i see it begin to climb up to 20 i let off..........

Are you aware that running any boost greater than 13 psi does absolutely nothing for performance and simply heats up the intake charge to much higher levels than desired?

Do yourself a favor:

Run a 0-60 time at 20 psi.

Then dial the boost back down to 13 psi and run a 0-60 time again on the same stretch of roadway.

Report back with results.

gsxr · #2 03-21-2007, 10:18 AM

Quote:

Originally Posted by Brian Carlton

Do yourself a favor:

Run a 0-60 time at 20 psi.

Then dial the boost back down to 13 psi and run a 0-60 time again on the same stretch of roadway.

Report back with results.

Excellent recommendation, Brian. I have personally done this on two different cars ('84 and '87 300D) and the results are quite interesting. Mine wouldn't go past about 17psi, though. With the wastegate operational, normal boost was in the 12-13psi range.

Now that I have an IAT gauge on the '87, I'm tempted to repeat the test, to see the actual increase in IAT.

winmutt · #3 03-20-2007, 08:21 PM

Quote:

Originally Posted by juggernaut

alright, met me clarify some things.. i do have all the important gauges. i got a boost gauge, and a pyro, but the probe is behind the turbo. im planning on making it pre-turbo for more accurate readings cuz i know the turbo is a couple hundred degree heat sink. the turbo IS making 25 psi, but thats all it will make.. ive had it pinned on the highway, and its all that 42mm is capable of making. but dont worry, i rarely bring it up past 17-18 psi. if i see it begin to climb up to 20 i let off. so i'd like to do injection timing, but i hear thats an extensive process, which im not really eager to jump into. ive been thinking about intercooling it because i know it can make a good percentage of more power, but looking at the turbo setup and downpipe, it doesnt seem possible.
ive got a brand new air filter in it, and i run powerservice thru it. keeps the fuel from gelling up in cold weather, while cleaning the injectors, lubricating the pump, and boosting the cetane a couple points. so ill go check out those links you guys posted

First do a diesel purge if you haven't. In order to intercool you have to clock the turbo and you can make something fit. Plenty of others have. Haven't you seen the supercharger+BF turbo wagon?

juggernaut · #4 03-20-2007, 10:23 PM

Quote:

Originally Posted by winmutt

First do a diesel purge if you haven't. In order to intercool you have to clock the turbo and you can make something fit. Plenty of others have. Haven't you seen the supercharger+BF turbo wagon?

no i havent, sorry... and i would really like to make some runs dialing in the boost pressure, but i unfortunately do not have boost control, and as far as i know, the wastegate is not adjustable..

samson's 3DB · #5 03-20-2007, 11:29 PM

Do You have $12 Juggernaut? Do me a flavor get one of these: (feel unhappy for ya if somethin in that engine melts)

http://cgi.ebay.com/ebaymotors/High-Quality-Manual-Boost-Controller-Ecliplse-Talon-NR_W0QQitemZ190094021632QQcategoryZ33742QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

The wastegate is adjustable But It takes to much time and effort so just get some rubber hoses from a hardware store and pop that $12 boost controler
on and get it to the right setting you stated that you had a boost gauge and a pyrometer right? Just do it

Where did you get that pyrometer i need one? Thery're expensive so does any one know where i can get a descent one for a good price

PS boost controler works I have one myself its just a ball bearing with a spring. I think thats how all manual boost controlers work The Expensive one just look nicer

427L88 "JOY MAI HINGH"

Austin85 · #6 03-20-2007, 11:39 PM

http://www.wade************************/index.html

I am getting one for my new 300CD soon...

...

juggernaut · #7 03-22-2007, 05:04 PM

Quote:

Originally Posted by samson's 3DB

Do You have $12 Juggernaut? Do me a flavor get one of these: (feel unhappy for ya if somethin in that engine melts)

http://cgi.ebay.com/ebaymotors/High-Quality-Manual-Boost-Controller-Ecliplse-Talon-NR_W0QQitemZ190094021632QQcategoryZ33742QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

The wastegate is adjustable But It takes to much time and effort so just get some rubber hoses from a hardware store and pop that $12 boost controler
on and get it to the right setting you stated that you had a boost gauge and a pyrometer right? Just do it

Where did you get that pyrometer i need one? Thery're expensive so does any one know where i can get a descent one for a good price

PS boost controler works I have one myself its just a ball bearing with a spring. I think thats how all manual boost controlers work The Expensive one just look nicer

427L88 "JOY MAI HINGH"

ive actually been looking on ebay for a boost controler, but the cheapest i could find was something likr $85. i was proably looking in the wrong section. anyways, about the pyro.. i ordered it from summit.com. its the ultra-lite pyro kit. it cost about $135, and the most difficult part of the install was pulling the intake off so i could get access to the exhaust manifold.
i would really like to get one of those electronic power meters for engine horsepower, torque, 0-60, g forces, etc.. but im hesitant to throw $100 at a thing that allegedly does all that by sticking to your windshield...

#8 03-20-2007, 11:27 PM

Quote:

Originally Posted by juggernaut

ive been thinking about intercooling it because i know it can make a good percentage of more power, but looking at the turbo setup and downpipe, it doesnt seem possible.

Check out the intercooler link in my signature.

Simply installing an intercooler will NOT give you instant additional power. You still have to turn up the pump. At most, you will probably get 2hp from the increase in combustion efficiency.

WINGAS · #9 03-21-2007, 12:45 AM

I'm new here, so I shouldnt even say but, Jugegrnaut, man, you must have a machine shop and a few shortblocks laying around to be playing like that. Or put another way, why turn up the dial to full on before you measure performance to find peak system efficiency. Spend some dough on a GETCH and check 0-60 times at different boosts. Or a chassis dyno session. Some form of real measurement.

Again, being a diesel noob and blown diesel virgin, still it would still have to flow a bunch more fuel to be effective, then there's cam timing ,etc. Just saying you should find the sweet spot of the system, and baseline things so you dont needlessly push the bottom end.

Dont trust your " glut dyno " , measure it.