whipplem104

It is entirely possible either way but I can tell you for sure that the stock exh manifolds are going to be a huge problem for making top end power one way or the other. The way your setup is laid out I would at least try some kleeman mids. The 55 manifolds have the same outlet diameter as my stock manifolds on my car. I think it is 1.6- inches. When I went to headers and a 2.5 inch collector my dyno graph went from looking like yours to continuing up the rest of the rpm range. THat is with a blower but same problem. Air flow.
That is what size your primaries should be at a minimum. You should have something in the neighborhood of 2.25-2.5 inch collectors.

Joncl

twin turbo cls has stock manifolds

Sir-Boost-a-Lot

iTrader: (1)

Tell that to the LS boys making 1500+ hp through stock cast iron truck manifolds with less than a 2" outlet.

You're right that there's power to be gained from a nicely engineered tubular header system but those manifolds are 100% not the reason Chawkins is nosing power over at barely 500 whp.

320 dreamer

craig are you getting tials? wish you got 46mm precision w/g instead. thats what i used on my 3071 turbos and came rec. from garth. they are a true 46mm w/g

i don't know if you can run emap (exhaust manifold absolute pressure) sensors on your setup but i run a sensor on each side to watch back pressure into the cylinder on the proefi

chawkins2001

Yes, tials Steve. Once it hits 537rwhp around 5500rpms, it just noses over completely.

boostedfe3

Craig, What is your plug gap?

whipplem104

I looked up these manifolds and they have a 2.25" outlet. Which is 1.8x larger than the stock outlet on a e55. It also seems that people are porting and or cutting the flange off and welding on a larger v band outlet for bigger hp. But I found a thread on a guy making basically a 1000whp on stock ones. Which if you multiply 1.8 to, what was it 530 you will get you will get 954. This is not an exact representation of all that is going on but it would certainly be close.
The truck manifolds also look as though they are a pretty nice design rather than a log manifold like the Mercedes.

chawkins2001

pulled it all the way down to .022 bro. had it previously in the high .020's before that and no change.

whipplem104

Also wanted to share that on Open class cars in Rally we run a single 34mm restrictor on the turbo inlet. Now this is cold side so dense air vs hot air and we are limited to around 300fwhp give or take a little.

BI-Performance

Right now I am putting in bungs on both downpipes to measure back pressure. I am also putting a sensor in the passenger side manifold to measure air fuel. I already have a sensor in the driver side, so this way we can see the air fuel on both banks of the motor.

Last we are going to measure boost at the turbo and not the intake manifold, the turbo might be putting out way more boost than we think, but the intake manifold might only be reading 17lbs which is what we are seeing on the dyno.

Hopefully this will narrow down what this b***h is all upset about.

Denroll

Has IPS said anything yet?

berti_00

+1

BI-Performance

Yes, we have been in talks We are swapping out the 38mm waste gates for the 44mm waste gates with them.

Sir-Boost-a-Lot

iTrader: (1)

Your multiplications to calculate HP potential of a manifold are completely irrelevant, as the countless number of other variables would make anything other than guessing an exercise in futility.

Too keep the thread on track, the MB manis are definitely small, but not as small as mentioned earlier coming in at just a touch under 1.640 for the inner stainless tubing..

whipplem104

That is what size I said they were. And it is not irrelevant. If you calculate the area that is available it is simple math on the available air mass that can pass through that size opening. THere are things that can make that better or worse, such as the whether or not it has a smooth transition such as a velocity stack. This would maximize the available opening size but an abrupt ledge leading into the outlet will reduce the available space by somewhere around 10%.

EREBUS

Damn it Craig, use the link I texted you and get the God forsaken map clamp from Split Sec already. It's $75 and 30 minutes of your blessed time. The sh*tty **** map/ecu issue is the reason why we don't have monster m113ks. If it doesn't work, I will send you the damn money through FeeBay. Hell fire.



carry on.


kick *** and take names, brother!

chawkins2001

I have the map clamp, just need to put it on brotha.

EREBUS

EREBUS

Do it. With ported heads/larger valves, 5.7L engine, MBH long tube headers and full 3" exhaust with cut outs......I hit 16 psi and still trigger failsafe/limp. Map clamp fixed my woes, brother.

chawkins2001

Thanks homey, I will get it installed if our work around for finding the map sensor addresses are not found and changed.

Today the 44's go in with new larger down pipes, back pressure sensors and passenger side AF sensor.

jmb614

What is this link you speak of?

blackbenzz

https://splitsec.com/product/vc3-100-voltage-clamp/

chawkins2001

44's are in

vioilio

Is this safe to use? I'm having the exact same issue. Hitting over boost and throwing P0106 code only if i start pushing the car hard. Under normal driving condition and not (much fun) this code will not show.

blackbenzz

It is a band aid solution until one of the tuners figures out a real solution or someone finally comes out with a PnP standalone solution for these cars