MBWorld.org Forums - Guys with 180mm and no cats

MBWorld.org Forums (https://mbworld.org/forums/)

- W211 AMG (https://mbworld.org/forums/w211-amg-81/)

- - Guys with 180mm and no cats - Come in (https://mbworld.org/forums/w211-amg/730971-guys-180mm-no-cats-come.html)

Drew Durham

12-23-2018 10:01 AM

Guys with 180mm and no cats - Come in

I am currently running a 180mm lower with a stock upper. The car has eurocharged mid lenghts with no cats or resonators.

I am wondering what type of boost numbers you all are seeing. I am at sea level and my car will show about anywhere from 8-9 psi in 1st gear, 8-9 in 2nd gear, and 10-11 psi in 3rd gear. Also i am loosing boost at higher Rpm. At the top of 3rd gear the car is only showing 8.4 psi. I feel as though these numbers are a little low.

Do you all see boost drop off at high RPM?? Do these numbers seem low??

ChiCho55AMG

12-23-2018 06:13 PM

Whats your cooling setup ? more cooling= more power in this engine

Drew Durham

12-23-2018 10:17 PM

Have a 5 gallon trunk tank with a superflow pump.

during this run that I logged with these boost numbers the IAT never got above 124*

ChiCho55AMG

12-24-2018 04:17 AM

Split cooling + Secondary HE ? or with one upgraded HE over stock ? or even still on stock HE ?

Do you have BWK ?

C3Duece

12-24-2018 01:13 PM

Quote:

Originally Posted by ChiCho55AMG (Post 7637352)

Whats your cooling setup ? more cooling= more power in this engine

cooling has nothing to do with boost.

OP probably has lowish boost at high rpms due to belt slip (look for black dust around the pulley) or most likely because he's got no headers and no cats which makes for a very high flow system.

All times are GMT -4. The time now is 12:35 AM.