Should I add a cold air intake to my 300E???? - Page 2 - PeachParts Mercedes-Benz Forum

AF300E · #16 07-31-2003, 02:41 AM

No, I just want to know what cam, ecu etc it might have in it.
I want to modify mine but i don't want to go turbo (love naturally aspirated sixes that fly!!)

2phast · #17 07-31-2003, 09:53 AM

This is what I know about the motor.

It starts as a M103-983 and is stroked to 3.2l using a lightened OM603 crank with 84 mm stroke and an 89.9 mm bore. Of course there was porting/polishing of the head and a AMG cam. Resulting hp was 234.

Flash Gordon · #18 07-31-2003, 03:48 PM

I installed the CAI in my Acura, made by AEM about 2 years ago. Unfortunately, I don't know anyone makes a CAI for MB. You can get CAI for Bimmer but not for MB. The market is just too small for any maker to make money from MB cars. I love my CAI. Not only it increased 15 HP with roar when the V-Tech kicks in at 5K rpm when you floored the pedal, the rpm is lowered by about 300 at hwy cruising.

mike690003 · #19 07-31-2003, 04:26 PM

so the idea for a cold air intake is still in the works right??

2phast · #20 07-31-2003, 06:10 PM

One of the main reasons you see such an improvement on the Integra is that the factory air intake is really restrictive. The main restrictor is the air box resonator inside the passenger side fender. Just by eliminating this, you can net up to 10 rwhp, figure a drop in K&N or Mugen filter for another couple of hp. Quite a bit cheaper than $150 for a AEM CAI.

For the M103 motor, the stock intake and TB is difficult to improve upon, plus factor in that there is really no way to run a CAI tube down into the front bumper, our TB's being mounted vertical instead of horizontal (like the Integra) really cuts into clearances with the hood. Even the intake I made rubbed against the hood liner.

Restrictive stock Integra air box resonator

Replacement pipe I made that runs from the bottom of the air filter housing into the front bumper area, this replaces the stock airbox resonator.

AF300E · #21 07-31-2003, 06:41 PM

I'm a bit surprised at the modest output of that amg m103.
the euros as far as i know put out 180hp. The amg seems to be putting out about the same as a euro spec m104 (3l 24 valve).

2phast · #22 07-31-2003, 07:02 PM

234 hp from 3.2l is actually pretty good, especially for a 12 valve motor. The M104 stock puts out either 218 or 228 (depending upon which one it is) so yes, stock these put out almost as much as the M103 Tuned and stoked.

Stock hp on a US spec M103 2.6l is 158 and on the M103 3.0 it is 178 hp.

AF300E · #23 07-31-2003, 07:16 PM

Are you aware of any changes to the ECU, Air flow meter, EHA or intake manifold?

omegabenz · #24 07-31-2003, 09:25 PM

forget the M103, put in the M104 E320 engine with electrionic fuel injection and get rid of the CIS, or get the M104 3.6L from the E36, or C36. Getting COLD air from somewhere cold, not HOT like in the engine bay is always good. Plus on CIS cars mercedes do better with mercedes air filters because the CIS throttle plate is calibrated for the resistance of the air filter.

Jackd · #25 07-31-2003, 09:36 PM

Flash Gordon said: ''the rpm is lowered by about 300 at hwy cruising.''
If you can explain how an air intake system can lower RPM at cruising speed, I will have learned something new after 35 years+ of working on cars.
JackD

AF300E · #26 07-31-2003, 09:39 PM

I can't have lowered the engine speed in relation to ground speed. Maybe on jap-crap the air-intake and diff ratios are somehow intergrated? Hehe.

2phast · #27 07-31-2003, 11:49 PM

The M104 with EFI is a novel idea but a friggin PITA to do. A easier swap would be the earlier M104 that uses the CIS, a motor from a 91 300sl or 300SE, those motors put out 228 hp in stock form. Not a easy swap either, only a few people have done it and none have documented the swap and none are too willing to spend time sharing the knowledge.

AMG considered dropping the M104 w/CiS into the W201 but for some reason decided to keep the M103 and modify it instead.

I have searched for ECU part numbers for the AMG 3.2l W201 but have come up with nothing. Considering that the ECU does not do much in the way of fuel delivery, AMG might of just used a 3.0l W124 ECU

Flash Gordon · #28 08-01-2003, 11:38 AM

Quote:

Originally posted by Jackd
Flash Gordon said: ''the rpm is lowered by about 300 at hwy cruising.''
If you can explain how an air intake system can lower RPM at cruising speed, I will have learned something new after 35 years+ of working on cars.
JackD

I am not an AEM CAI designer for explaining the theories of CAI. All I know is that the mileage has improved due to better breathing. In addition, when I cruise 60-70, the rpms is lowered by 200-300. Have you had any experience with CAI?

Jackd · #29 08-10-2003, 08:37 PM

Flash Gordon:
CAI is air intake related.
Engine RPM at a given speed is ''gear ratio'' related.
Your statement :: ''I cruise 60-70, the rpms is lowered by 200-300RPM"" with whatever CAI makes as much sense as if you were saying your car has more power and handles better when you wear a white and blue t-****.

JackD

Flash Gordon · #30 08-11-2003, 08:24 AM

Quote:

Originally posted by Jackd
Flash Gordon:
CAI is air intake related.
Engine RPM at a given speed is ''gear ratio'' related.
Your statement :: ''I cruise 60-70, the rpms is lowered by 200-300RPM"" with whatever CAI makes as much sense as if you were saying your car has more power and handles better when you wear a white and blue t-****.

JackD

I am just reporting my experience with the AEM CAI I have, no more, no less. You seem to know a lot about CAI. Tell me what CAI experience you have on your car so I can be enlightened