VE values too low

Red_bull · Post by **Red_bull** » Wed Sep 17, 2014 3:00 am

Hello guys,

I was wondering what could cause a whole VE table to be too low. I don't have my laptop close to me so i can't upload by tune or show my VE table, but with boost (130) i am still around a VE of 80 or something. I double checked my injector settings, but i can't find anything wrong. Car also doesn't feel really slow or something, so engine flow seems to be fine

I have checked: Fuel calculation in MS (Engine size is correct, Injector Flow is correct, Fuel pressure on rail for this flow is correct); I checked injector deadtime it is set to 0.8ms and in the uppersize of the VE this shouldn't matter as much.

Where can my mistake be?

I am running Lucas MJY10023 injectors and have used the setting of 380cc/min

grom_e30 · Post by **grom_e30** » Wed Sep 17, 2014 6:09 am

what ecu? i dead time tested those injectors on my ms3 with ms3x and found them to be pretty quick injectors, 0.5 dead time if i remember correctly. il confirm later

Red_bull · Post by **Red_bull** » Wed Sep 17, 2014 6:54 am

Sorry completly forgot i am running a Megasquirt 2! Yea i am still planning to figure out the dead time exactly but till now i am running a standard setting.

elutionsdesign · Post by **elutionsdesign** » Wed Sep 17, 2014 8:11 am

The VE is relative to your required fuel setting, if you want the VE table higher lower the required fuel. As long as your tune is meeting your requirements I would not worry.

grom_e30 · Post by **grom_e30** » Wed Sep 17, 2014 10:23 am

update I measured and got 0.416 @ 13.2v when i tested mine using the ms3x drivers.

dontz125 · Post by **dontz125** » Wed Sep 17, 2014 2:09 pm

Further to elutiondesign's comment, if you have Multiply MAP and Incorporate AFR turned on, a VE in the 80s past peak torque is not unreasonable. By the same token, with both of those turned off it's REALLY easy for a boosted engine to bounce off the max 255 value.

Red_bull · Post by **Red_bull** » Thu Sep 18, 2014 2:41 am

I knew it's relative, but i expected a value above 100 to 140 or something under boost. I will check the manual because i am pretty sure i have multiply map and incorporate AFR turned on yea. So will look into that why 80 is reasonable then. Thanks for the help!

kaeman · Post by **kaeman** » Mon Sep 22, 2014 10:20 pm

Hey If you could load the tune and a datalog.... that would be helpful.

Red_bull · Post by **Red_bull** » Tue Sep 23, 2014 1:02 pm

Still haven't been able to get to my laptop with the tune on it. Probably coming weekend

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VE values too low

VE values too low

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