Strange looking VE map

Mobne_s13
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Joined: Sun May 25, 2008 8:56 pm

Strange looking VE map

Postby Mobne_s13 » Sat Sep 12, 2015 7:41 pm

I have a real issue tuning VE on my s54 engine.

The injector dead time is coorect set up. The flow rate is also correct (if im not beeing riped of and my injectors is not 1000cc).
Fuel pressure is 300kpa in the software and 3bars checked at atmospheric pressure on the regulator.

But sill im seeing Ve numbers over 150% on 3000rpm and higher VE on idle than on most load conditions.
I have let the elite 2500 ecu do the tuning, after the afr target map. It works great, engine has good afr and runs fine. But my map looks totall "fked".

What im i missing here? What can cause this strange looking map?

Worth notice is that engine is not tuned over 4000rpm due to the clutch slipping soon after 3000.. But on the light load i have been reving it higer.
Attachments
soppa.JPG

race jase
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Joined: Fri Dec 17, 2010 7:08 pm

Re: Strange looking VE map

Postby race jase » Sun Sep 13, 2015 2:13 pm

Hi
Mate most common fueling issues come back to incorrect injector dead time or some of the VE info not correct.
If you dont have the known correct dead time values i would recommend the haltech default times also i would post up your base map so the guys here can have a look to make sure your info is set up right.
What make of injectors are you running?
Jase

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HaltechMatthew
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Re: Strange looking VE map

Postby HaltechMatthew » Thu Oct 08, 2015 4:50 pm

Too high VE at idle indicates the Dead Time is too low. In effect you are needing to compensate by increasing the VE numbers at light load, where dead time takes up the majority of the commanded pulse width.

IF VE is too high under load, then you either have injectors that don't flow what they are supposed to, your fuel pressure is not as expected, displacement is not correct, or your engine should be on the starting grid of the F1 for being 150% efficient!

Donn29
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Re: Strange looking VE map

Postby Donn29 » Sat Oct 10, 2015 5:10 am

What about VE that is too low?

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HaltechMatthew
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Re: Strange looking VE map

Postby HaltechMatthew » Wed Oct 14, 2015 4:37 pm

Then the exact opposite....

Mobne_s13
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Re: Strange looking VE map

Postby Mobne_s13 » Sat Dec 05, 2015 4:13 am

Engine is now dynoed.

Standard bmw s54b32 engine with vanos and tuned on E85.

Engine makes 300whp.

This is how the map went out. Its fucked up looking ve tables. Im guessing the vanos makes some inpact on how the map looks.
At this point calculating my injector size based on engine horsepower and dutycycle, my 1000cc injectors are more like 700cc.

Adding a new print of the fuelmap.
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Skärmklipp.JPG

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HaltechMatthew
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Re: Strange looking VE map

Postby HaltechMatthew » Mon Dec 07, 2015 12:27 pm

You need to attach the map file. A screenshot does not tell us anything sorry.

Mobne_s13
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Re: Strange looking VE map

Postby Mobne_s13 » Sat Jun 09, 2018 9:20 pm

Injectors where 750cc instead of 1000 as said.
No more strange VE numbers :)


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