Exotic-metal55

First ,I have had two Johnson cm30 fail in the last two months. Both tested direct to a 12v battery after removal and the pump will not power up.. Took apart the impeller area and everything looked good. LAbel showed to be 12volt pump and 22.5 lpm @ .15 bar head. I used the stock wire connection and the blue/black wire for power/hot wire..

Johnson CM30 GPM
CM30P7-1 Hose connection 6.9
ø 20 mm (3/4") 5.2


Based on the published Cm30 specs, I can not see how the CM30 will outflow the bosch listed below.. I am not a flow expert but it seems the Bosch flows a lot more at higher resistance??? Just asking.. I put the bosch pump on today listed below. Fit exaclty like stock and is used by many intercooled systems.
Bosch specs. below.. I paid only 119.00 !

http://rb-aa.bosch.com/boaaemocs/Pro...18&prod_id=510

jangy

Watch what you say about the adequate CM30. Many cars have run just fine with it. Oh, wait.....plenty of cars run fine on the OEM pump, too. Maybe it was a different point. Anyhow, you are finding some of the newer designs out but that Bosch is only a heavy duty version of our OEM pumps. It will also wear out. Any traditional pump with magnets and wires will eventually corode.

HAHA BYE

can we tack this on to my other thread please lmao hey jangy check it out a cm30 lol

Code3 Performance

Very interesting data.

jangy

Remind me of my dad refusing to get a computer because he was doing just fine with the house phone.....

bobgodd

The streets will flow with the blood of the non-believers!!!

Exotic-metal55

I am just a performance enthusiast trying to sort through all the hype and get great performing parts for great value

Why did two CM30 fails on me in two months and only 3000 miles? Who knows . The link for these pumps has been posted several times and thet are not a sponsor.. They do not stand behind their pumps either,, so to me the Cm30 is a waste of money for replacing the stock pump and or adding to an aftermarket H/E..

I ran several data log runs up to 100 mph today and tested the HD Bosch. It worked very well at only 15 deg above ambient before making a couple of runs. After several runs,,, recovery was fast and IAT would be about 22-26 above ambient. I would say this is slightly better than the cm30 or equal at worst.



After my test and installing 3 pumps now; If my car was stock or I planed to run a stock H/E the HD bosch is the best way to go. Fits like stock and performs better than stock and probally the cm30.. Price is a lot better, as Lingenfelter and most American performace cars use this pump for aftermarket..

If you add any aftermarket pulley, then it is a must to ADD a larger H/E and super pump.. IMO.. Water wetter, 10 deg mod and seperating I/C system just will not do much from what I can tell. Even with a cm30 or HD bosch, I will run up to 160 deg. IAT in a 1/4 mile run or higher with stock H/E and or cm30/hd bosch.. It is true, at 140 deg. IAT timing is pulled hard and fuel dumped. Power lost !

I will be adding the Extra/larger H/E and super pump.. Super pump, I guess Mezarie 136, Davies or CM90 are in this class (any pump that flows 15gpm or better) . Johnson`s are out for me, as they have two strikes in my book.


Brandon, you have those H/E `s in yet??


,

Zod

This is my take on it, for people who are not sure.

The old model 55k cars had a defective pump that caused many issues in the 2003 + models. This was a bosch pump. Many looked for alternative cooling solutions and found the cm30 to be the option.
However MB replaced this pump 3 times over the course of improvments i belive (maybe 4) and the end result is a stable functional pump desgned for our cars.
I have the part number laying around some where for the latest pump.
Bottem line is if you have a bad pump, go to MB dealer and ask for the latest replacemnt pump and you will be sorted

Exotic-metal55

Here are a few pics of the impeller housing of the Cm30.. Yes, that is a small dime inside .. The hard part to see is the very small water port hole inside the roof cap.. It is like half the size of the hose port..

jangy

That is why the CM90 doesn't add too much...

Exotic-metal55

Just added two more pics. You can see the restriction on the inlet side (top) and note the small outlet side on the bottom right side.. Very small and I used the US dime for size reference.


I would think the CM90 would be a nice improvement over this cm30 , as it is larger all the way around.. Again, that may not be saying much.. Doing an on car flow test would be the best way.. That would be real time!

Jakpro1

This is great though Exotic. This pump fries and you 100% know it's your system.

Keep us updated.

Jakpro1

That was an awesome idea with the dime.

Here are some snaps of my extra Johnson 90 for you to compare.

HAHA BYE

Exotic-metal55

WOW! that CM90 is huge! I do not see the inlet restriction on the 90 (nice!). Hard to tell but the outlet looks wide open too. All those doubters need to take back those remarks about your 1" pipes hurting performance.. You need the larger ID, just to equal your stock lines. The cm30 has at least 40% of the flow blocked or reduced.!

After looking into the CM30, I just do not feel it can do the job. To much restriction and it does not perform well (per specs) under load. It also has a 212 deg coolant heat capacity and that is way to low.


I had two pumps fail and do not know what happened. I sent one back to be tested and credit my account but no help there.. I have moved on to the Bosch HD pump and LEARNED a lot along the way.. Both my pumps would not work , even being bench tested directly to a 12volt battery. They both turned freely and no debris inside to stop the impeller. This is a very, very simple install and wire hook up, so not sure what kiled them.. Maybe I was just sold bad stuff but at the end of the day ,, I do not know..


After I tes the Bosch on a larger (extra) H/E ,, then I will go with a super pump.. Mezarie 136, Cm90, etc..

FLSL55

ZOD,

Can you hook us up with the latest pump part number please.

I take it this will also work in an 03 SL55?

Thanks!

sh123

Hello every one ..

I'm new here .. and this is my first visit !!

i wanna your help !
my E55 AMG 2005 .. i've made tune up svc and the car doing fine ! BUT when i go with full accelerate .. end of rpm around 5.9 the car perfomance go down down down tel end of rpm around 6.4 .. after gear shifting the perfomance back again top of it until end of rpm goung down ... etc !

i install my laptop and check the water intercooler .. after start my car the firist number was 60C .. the car stil cold .. after few runs and full accelrate the temp. reach over 108C and the range between 70c - 90c up to over 100c !!!
--
then they told me I HAVE TO CHANGE IT WITH JHONSON CM30 ! or any brand !???

is it right ??????

regards

tarekc

i need to replace my ic pump is the bosch still workin good for you? ( or should i got with something else?)
u only paid 118$ that cheap
can you order it online? dont know where there are any bosch outlets near ?

im driving 03 e55 amg

tbal

soooo in conclusion cm30 is junk, use bosch hd? lol

SuperchargerV8

well my 03 model pump failed and then mb dealer changed it last year and said its the latest pump mb use on the 55k motor it does not really fail and is very strong alot better then what i had stock in my 03 it was bosch and has been good so far.

but i think off the top of my head loco 05 ran a 10sec pass with cm30 so who knows lol

emoving

+1 I just replaced my pump and was told by two tuners and my AMG mechanic that the newest Bosch pump out is superior to the Johnson. I had already bought the Johnson but ended up putting the new Bosch in. I have a brand new Johnson as a back up.

tarekc

do u have the part number for the new bosch hd ? i got the 03 e55 amg?

thanks

Lopes80

Can someone please post the part number for the new pump. Thanks

emoving

Not sure but Benz will have it....its the latest one they are using.

tbal

where can you get it from online?

If my stock pump is working fine, is there any benefits in replacing it with this better flowing one?