190E 3.0-12v Turbo - PeachParts Mercedes-Benz Forum

Joreto · #1 04-28-2009, 02:36 AM

Quote:

Originally Posted by RBYCC

11.5 bar/cyl compression is within range...minimum is 8.5 bars.
M103-12V is 9.2:1 CR which is almost optimum for a turbo engine.
My M103-12V is at 12.9 bar/ 190psi per cylinder.

Main things that would cause detonation are too low octane, too lean AFR or too much timing.

You indicate fairly rich AFR's which should support timing advance.

What octane gas are you using ?

Ed A.

Ed, I'm currently using 95 octane (euro rating) and will try 98 octane when this tank is done. I pulled back the timing to 5 degrees but could still here the same noise around the same rpm. Now the question is , is it really knocking , also if it's knocking could it be from the spark plugs (using the standard heat range with resistors), or from a weak spark, say the coil doesn't have enough charge time ?

Quote:

Originally Posted by Bluefang

Are you sure it actually knocking, and not just a bad signal from the Hall sensor. When i first installed my 36-1 trigger wheel i put the reading sensor too close to the wheel and it ended up distorting the signal when it went over 4.5k rpm and it would miss like hell and have a knocking noise to it as well.

Well to be honest I'm not 100% sure but it sounds like knocking. It doesn't make sense (to me at least)....alright its knocking with 24 deg. timing advance (NA was running 29 deg.) but then I started pulling the timing and backed it to 5 deg. and the sound was still there. Also it doesn't feel like missing, although I lift off
immediately when I here the sound, also it run fine with no missing in NA form all the way to 6300 rpm (rev limit).

Quote:

Originally Posted by JayRash

Off topic, but is the car missing the left firewall!!!!! ????

Jay, all firewalls are in place none are missing . I have to tidy the engine bay, but want to get it running right first :-)

JayRash · #2 04-28-2009, 04:50 AM

Quote:

Originally Posted by Joreto

Jay, all firewalls are in place none are missing . I have to tidy the engine bay, but want to get it running right first :-)

Forgot its a W201 not W124.

BTW back when my car was stock for a period of time it used to have a knock like sound every time i reached 5000 rpm. i knew it was not knock then cause i know the type of knock my car made and the rattle i was hearing was different. the rattle was quicker and un interrupted then it faded over 6000rpm. till now i have no idea what it was but car ran with that for almost a year. that went away with the turbo install.

Any way make sure the metal sheet that covers the engine mount is fixed firm and look for any metal shields that might be rattling about.

And always use 98, as 95 is sure to cause detonation, but u already know that

, but factoring in that u have droped ur advance that much, i doubt iits detonation u hear.

Joreto · #3 04-28-2009, 05:29 AM

Quote:

Originally Posted by JayRash

Forgot its a W201 not W124.

BTW back when my car was stock for a period of time it used to have a knock like sound every time i reached 5000 rpm. i knew it was not knock then cause i know the type of knock my car made and the rattle i was hearing was different. the rattle was quicker and un interrupted then it faded over 6000rpm. till now i have no idea what it was but car ran with that for almost a year. that went away with the turbo install.

Any way make sure the metal sheet that covers the engine mount is fixed firm and look for any metal shields that might be rattling about.

And always use 98, as 95 is sure to cause detonation, but u already know that

, but factoring in that u have droped ur advance that much, i doubt iits detonation u hear.

Jay, from discussing it with friends I've come to the conclusion that it is most likely pre-ignition caused by the hot spark plugs. I'm currently running H9DCO, on the 16v I run H7 and later on H6 without a problem, also found out(searched the forum) that RBYCC runs NGK BP6EFS which is equal to the Bosch H6DC . I'll get new plugs tomorrow and see what happens, hope they solve the problem

.

JayRash · #4 04-28-2009, 06:48 AM

Quote:

Originally Posted by Joreto

Jay, from discussing it with friends I've come to the conclusion that it is most likely pre-ignition caused by the hot spark plugs. I'm currently running H9DCO, on the 16v I run H7 and later on H6 without a problem, also found out(searched the forum) that RBYCC runs NGK BP6EFS which is equal to the Bosch H6DC . I'll get new plugs tomorrow and see what happens, hope they solve the problem

.

wanted to ask u abt the heat range ur using, but since i have always used range 7 i assumed your using same. as they say assumption is the mother of all ****ups.

i was using bosch super+4 ranges 5/6

c280nz · #5 04-28-2009, 07:10 AM

check the plugs, go for a new cooler heat range like your going, just go for copper plugs, they are ment to be better st preventing detonation than these new iridium tips etc,
the plug gap may be to large, and with the increased fuel/air mix in the chamber it may be strugling to fire,or it could be from a build up on the plugs or sharp point etc,
u sound like youl get it sorted tho!
if you ease boost off alittle bit and if it stops doing it you will know its pre-ignition/detonation

RBYCC · #6 04-28-2009, 08:27 AM

Quote:

Originally Posted by Joreto

Ed, I'm currently using 95 octane (euro rating) and will try 98 octane when this tank is done. I pulled back the timing to 5 degrees but could still here the same noise around the same rpm. Now the question is , is it really knocking , also if it's knocking could it be from the spark plugs (using the standard heat range with resistors), or from a weak spark, say the coil doesn't have enough charge time ?

95RON=90USA
98RON=93USA

I wouldn't use anything lower then 98RON.
Try adding some octane booster with MMT..I use Lucas.

Plugs, I would use non-resistors.
Turbotechnics supplied NGK BP6EFS gapped at .030
They are non resistor and one heat range colder then stock.

I'm not familar with the MS system.

I use the stock EZL with the USA spec R16 resistor removed that gives me a 6deg advance.
Coil is also stock.
At 6psi I ran a 14.39/90mph with no traction.
Increased boost to 7psi, no track time yet but 302 torque at the rear wheels (approx 380 crank torque )

Just installed a manual boost controller to synchronize the turbos and have increased the boost to 9psi but no dyno run.

Never had any detonation even in 35C ambient...

Just can't get traction !!!