Xpresion

HI everyone,

I am strugling to see the car producing boost of 15psi. TO my knowledge and and information from Jerry from eurocharged, i technically should be seeing 15psi.

Under street driving and DYNO data log, the most i see is 13.8 psi, i dont even see 14psi yet 15 psi.

I have the following mods done to the car.

Renntech Crank pulley,(was on the car prior to purchasing the car) i believe its 165mm, however it could be 168mm, i am unable to tell exact size. however from my measurement i believe its 165mm? even though i can only find 168mm on the website ??

RENNTECH CF intake
Johnson HE pump
huge custom Heat exhanger
Split cooling with inline reservoir
K&N Filters
Secondary cats removed
Primary Cats hollowed out

Euro charged Clutched SC pulley I believe 84mm (recommended by Jerry to achieve 14.9-15psi)
Eurocharged tune

With data logging i am not experiencing any high IAT's nor heat soak. Highest IAT's i see after a dyno pull would be 50-60 deg Celsius.

Is there something i am overlooking here that may be stopping me from getting to 15psi? even 15.5? i don't thrash the car daily but on the odd occasion when i wana feel it growl, i would like to see it perform as i intended for it when i decided to purchase the mods in the first place.

Shall i just go for the next smaller SC pulley on the list?
or are there other matters which i may need to address that might be stopping me from achieving the claimed 15psi increase via the mods i have?

I was thinking if getting a TCU tune would help? maybe too much torque that the car is limiting boost? i honestly dont know how the E55 engine management work with the double TB's etc etc. i am all new to this type of engine. Give me anything Turbo and i can break it down to a single grain.

I have already removed the charged tanks and put brand new gaskets to eliminate possible boost leak.


all the help is much appreciated!

Regards

Rocman8

what is your elevation? i dont think that pulley combo adds up to 15psi. that pulley combo comes out to the same as a 180 crank pulley or a 77 sc pulley. with a 77mm pulley i see max 12.2 in 3rd gear at 1500 elevation. now i do have headers which dropped my boost about .8 so i would be seeing only 13.0

Ls1toAMG

What did the car dyno. The 168/84 combo is almost the same as a 180 or 77sc pulley. They don't create 15.5 lbs either. In the 14.4 range.
If your car put down around 480+ rwhp your in the correct range.

You will need a bigger pulley like 195 crank to get 15.5

Btw do injectors before you upsize the pulley

cnterline

Stock TB ? Pull your air cleaners and see what your boost is temporarily of course

Xpresion

The elevation would be roughly 600ft

I am a bit disappointed as 15 psi was my goal, followed by injectors. i really don't wana be spending more money on the correct pulley, when i was told i will achieve my goal of 15 with the recommended.


yes stock TB, I have tried running with no air filters even though they are brand spanking new K&N, still no difference with the boost.

I have even tapped a boot line into one of the charged tanks so i can get mechanical boost readout and i still see the same sub 14psi.

Being from Australia, our dyno is measured in RWKW and not RWHP. The last dyno showed 355rwkw i am unsure what that equates to in rwhp.

Ls1toAMG

That's 475 rwhp so you are where u should be.

kustom2k1

476rwhp.. all someone can do is give you an estimate of boost, with any combo. Put a catch can on the car and make sure your not loosing boost into the crankcase.

Xpresion

Thanks for that, do you mind sharing what conversion factor you used to go to rwhp?

And more importantly, is it possible if you can elaborate more on the boost leaking into the crank case? i didn't think crank case has positive pressure (boost).
I am assuming the Oil catch can will go where that breath line taps into the right side of intake *facing the engine*

Finally, since that power figure is claimed correct buy you guys, would a slightly smaller SC pulley be the next step in going closer to 15psi? or am i at my limit based on elevation ?


Thank you all for the prompt response!

C32owner

Some say, that adding a BWK can give you a little extra, that's to say you are suffering belt slippage which I guess you never know for real.

Xpresion

I have replaced the belt with a brand new one at the time of installing the new SC pulley, however i never heard it slip, I have noticed that the belt tensioner i have has a different wheel then what i am seeing online.( mine is completely flat surface, while the OEM ones have a valley or groove in the center) Perhaps the previous owner installed a generic one that may not be 100% OEM size and thus not applying the correct tension? but again, i have not heard any belt slip unless because its a new belt its not audible?

C32owner

You might have the ASP pulley kit on there.

kustom2k1

Crankcase, blow by, boost getting past the rings.

You want to get rid of the line running into your TB. Lines from the valve covers go into a catch can instead.

Larger crank pulley or smaller blower pulley would add more boost.

chawkins2001

I never saw more than 13.8lbs with a 187mm cp and ran 10.8x

I would not be concerned with boost if I were you, rather the hp/tq you are putting down along with track times.

bstudey01

Me too, 180mm crank and 84mm clutched and only around 13.5-14 psi max. Ran 10.8 at 128mph. Really that number is all that matters.

Xpresion

The car has done over 160,000kms so blow by past the Rings could be a possibility due to wear? or perhaps he didn't use the right oils on the car during ownership?. he was previously a LS engine fanatic, so maybe he lacked the knowledge with maintaining an AMG engine? I know he was not using the recommended Mobile 1 ultimate 0w40, instead, penrite 10w-40 i think? full synthetic formula.

Ok so the next step is to route those Breather hoses via a catch can first so its inline to catch any oil vapors. or are you saying to eliminate the return path and just have it breath into atmos and just catch any oil vapors?

Yeah i think this will be the new method of thinking forwards as the power seems about right for the mods?

It seems that the pulley i have is not ASP, mins is black in colour and resembles the stock one very much, however its all flat like the ASP. i have a feeling that it may be a generic one that fits which he purchased locally. unfortunately later on i found out that the previous owner didn't exactly look after the car as i hoped. i had the wrong expectation thinking he was a mechanic and all. :/

BagMan

You relieved some restriction by removing the cats, which lowers boost.

The SC belt might be slipping (even slightly) in the upper RPM range.

Hulk

That setup yields 13.5-14 psi, it's not belt slip. What matters is the power you are putting down. A catch can would be good just to get an idea of how much blow by you have.

JoeNobody

The crankcase vent MUST be connected to vacuum source. A breather element on it is not sufficient.