KR won't go away!!

[willn]

Hey guys I have a 2000 Silverado with a whipple supercharger with about 5-6psi psi of boost and 42# marine injectors. I have changed the IFR, Main VE table, and injector pulsewidth and I am at a point now where I am getting KR when I am at about 50% throttle. According to the PCM, I am only at about 30% duty cycle also. The LT's are at about 25% at idle, but will go to 0 during cruise. I have tried enabling the PE table at 40% throttle with no luck. I am attaching my current tune and log. Any ideas would be great. Thanks.

[drdarthinvader]

before you address your kr problem i think you should think about a cos3 or 5
since you have a wipple then you can have a separate ve table for 105kpa and above also get a 2or 3bar map sensor and adjust c6301 accordingly which would be a good base to start of with and go through the auto ve tutorial
b4001 ifr have not been interpolated see tutorials in forum

http://forum.efilive.com/showthread.php?t=7866

[willn]

I definately would like to go to a COS, but I have a 2000. Does that mean I can use any of the 2001 versions? I didn't quite understand that part.

[willn]

Oh yah, and yes, I have populated IFR, but when I go any higher than about 31lb/hr it bogs the engine down and runs like someone is pouring fuel down the intake.

[Highlander]

That car is going way lean I am sure... Notice it only happens when you sort of lift the throttle... either adjust the TP PE % or adjust your dynamics section

[Highlander]

You need to get a wideband!

[Highlander]

And easy... because in that situation you can break it...

[Highlander]

Your PE is too lean, supposing the MAF has been properly calibrated.
PE based on coolant temp should be different
Normal PE enable I would drop to 30%

w/o a wideband these are the changes I would do.

[Highlander]

Do you have a fuel pressure regulator???

[willn]

I don't have a fuel regulator and I have tried enabling PE at about 40% throttle and as soon as I hit PE, I get KR. Makes no sense, since it should be adding fuel and not going lean. If you look at my PE by RPM you will see it is set to dump fuel when going into PE mode, but I didn't have any luck with that. I would like to go to COS3, but being a 2000 year model, can I use ANY 2001 version? I am working on getting a wideband, but right now I have to wait. BTW, what is the dynamics section?

[Highlander]

Yes you can use any 2001 version...

One thing though... you need to fix your IFR constants... what injectors do you have?

[willn]

Well I thought that I bought the 8.1L marine injectors, but if I set the IFR anywhere above like 35lb/hr it adds WAY too much fuel and the truck will not run right. It bogs down like too much fuel is being added. I will try that COS tonight. Would you recommend COS3 or 5?

[willn]

Also, what would be an easy to use, quick install, cheap Wideband for my truck?

[willn]

My mods include: 6.0L, Whipple twin screw blower at 5-6psi (would like to go to 10psi eventually, but need more injector and bigger pump), built 4l60e, 42# 8.1L marine injectors, have NX kit installed, but not currently using it.

[Highlander]

use the innovatemotorsports lc1

[willn]

Alright I am going to order one. They are only $159 on ebay brand new. Until then I need to get this tune right. I have increased the VE 15% and enabled PE at 35% throttle. I am getting a lot less KR, but now with full throttle it feels like I have no power, almost like too much fuel. I am attaching the log. Lemme know what you think.

[drdarthinvader]

one thing i noticed with your log was my problem- iat related knock 35*c and below would be ideal also at high kpa you sill have 14.63 should have 11.70 kicking in you might want to post something on custom os forum to find out what cos u can run

[willn]

Well, I have PE kicking in at about 40%, which should put my commanded down there based on B3618.

[willn]

Alright, now going back to the stock tune, I am getting rough idle! Could I have ruined my O2's running it too rich?

[hquick]

IAT's are a killer with the Whipple. Seriously need to look into an intercooler (assuming you don't have one at present?).

[hquick]

These are 42lb injectors right? Rated at the GM standard of 43.5psi?
Stock regulator and fuel pressure of 58psi?
From the available spreadsheets....I have your IFR's at around 6.110675???
I had the Bosch 'greentop' Ford motorsport injectors for a while.
They were just too big for the 'upto' 8psi I was running.
Duty cycle barely ever reached 30%.
'Dynamics' allow you to counter the 'lean tip-in' issues the Whipple generates as you tap the accelerator.
Do a search for 'lean tip-in' and start reading.

[willn]

Actually I found out the hard way that they are the stock 8.1L injectors because I initially thought they were 42#ers but then when I tuned for that it dumped fuel in the cylinders and wouldn't run at all, but when I go to stock 8.1L IFR, it runs fine. Now, my issue is that it is surging at idle and LT's peg at 25% no matter what I do to the VE table. I am thinking since I put a rich mixture through it I either ruined the O2s or fouled a plug. Not sure yet.