Hi guys,

i hope someone can help me, i am in a special situation.

In Short: I own a used car an overhaul the hole engine for tuning. But the car has not full power. In the technical specs for the commonrail System from the manufacturer we found the reason, the manufacturer limit the max fuelpump/rail pressure as follows:

the first 20 hours over 1800 bar, then for 200 hours 1600-1800 bar. After that it’s Limited to max. 1600 bar and that is my problem. My car was an highway car for the old owner but my hole engine is new in case of tuning, and i want to use the full power again.
How and where can i find the limits in the software? I am not a professional and I have never heard before of something like this.

hopefully someone can help or has a damos with needed changes. Payment is no problem.

its an 2.2 HDi Bosch EDC17CP42 from 2012

I added an screenshot from the technical documents to my car for the fuelpump. There you can read the rail pressure limit in german at the green area... sorry no english version but it’s only to show that iam right.

Thanks in advance
1uck3r

1uck3r wrote:Hi guys,

i hope someone can help me, i am in a special situation.

In Short: I own a used car an overhaul the hole engine for tuning. But the car has not full power. In the technical specs for the commonrail System from the manufacturer we found the reason, the manufacturer limit the max fuelpump/rail pressure as follows:

the first 20 hours over 1800 bar, then for 200 hours 1600-1800 bar. After that it’s Limited to max. 1600 bar and that is my problem. My car was an highway car for the old owner but my hole engine is new in case of tuning, and i want to use the full power again.
How and where can i find the limits in the software? I am not a professional and I have never heard before of something like this.

hopefully someone can help or has a damos with needed changes. Payment is no problem.

its an 2.2 HDi Bosch EDC17CP42 from 2012

I added an screenshot from the technical documents to my car for the fuelpump. There you can read the rail pressure limit in german at the green area... sorry no english version but it’s only to show that iam right.

Thanks in advance
1uck3r

The document is not in English.... can't read it

wbr

post your file....I'll help for free

jurebv wrote:post your file....I'll help for free

Thanks a lot man, currently iam in the netherlands for 4 days, i will write you back when iam home.
Iam very interested how you could fix that because my car is the only one with Tuning with a railpressure limit 1600 bar, two other cars are no problem with my setup.

Greetings 1uck3r

Just increasing rail pressure wont make power difference...

jurebv wrote:Just increasing rail pressure wont make power difference...

For sure I know the tuning is not bad it’s not only rail pressure, my Tuner did a really good setup over all known maps. but my car is in a special Situation. We have to remove the duarability dependent limit of the rail pressure but it seams that no one knows how they do it in the software. The other two cars with my setup are not so old so the limits not reached.

The first 20 hours they allow over 1800bar for the rail
Then for 200 hours they allow 1600-1800 bar
After that it’s only 1600 bar
All in the ecu.

That’s the content of the official document from the manufacturer. The reason for this is a bad set of some inejctors at the release of this car. But my car is complete overhauled so i want my power back. I hope you can do it the next days.

It’s driving me crazy, new injectors, new pump, new turbo, new sensors everything is fine. But the ecu fixes the railpressure at 1600 bar the normal Stock pressure max is exactly 1836 bar you can see it in the maps but the ecu ignores it. Next step for summer would be a stage1 Turbo but currently it’s nearly useless.

An additional info could be that the official document say that the rail pressure is torque controlled. Is this the possible key? Or they manage it over the fuel regulator that’s fixed on the pump?! Only ideas and no idea how to fix it in the ecu.
I really hope you have an idea how to fix it. If it took longer payment is no problem for sure :)

Greetings 1uck3r

I.will help you, there are rail limiters but what do you think you will gain by increasing it?

Hi, the 1836 bar are stock, my car is only doing 1600 bar so I simply want my stock rail pressure back nothing more.
i have live logs my car and the car of my friend compared. He reaches 1810 bar and I can do what I want the ecu only allow 1610 bar. That’s simply useless with a fresh new engine. I have tested all by professionals injectors and so on everything is perfect. What should be a problem except the documented limit from the manufacturer in the technical docs of the fuelpump for the rail limit?

Greetings 1uck3r

ok post file but you will not experiance any power gains if u are aiming at this