Getting rid of fuel box with SLP and Timbersleds?

[AaronBND]

I have had fuel controllers on 2 sleds now and am learning to hate them. I cannot get the bottom lean enough with the Attitude box (already done the BD box and hated it worse) without dropping to 36psi on the fuel regulator. If I have to drop this low, why have one? I have full SLP exhaust and Timbersleds and plan on just tuning with fuel pressure. We run 5500-7500K and I have been fouling plugs down low and in the middle with box at stock settings. Been backing off fuel pressure and it seems silly to be at 36psi. Why not yank the box and run like 45-48psi. instead? I run only clear 92 octane fuel and with the altitude I can't see having a problem. I am going to go out tomorrow and test with the EGT's and pulling plugs to find the proper psi. Is anyone else running SLP and Timbersleds with no box? If so, what elevation and fuel pressure you settle at? Thanks!

Aaron

 

[89sandman]

07 M8 full slp, bdx intake, no box, no regulator, no problems. we ride 4500-7k.

 

[kane13]

I ran mine withought the box once it seemed to be running real lean at wot it was fine at lower rpm's, i have a attitude box on the way and i am hoping i have better luck at idle. I don't run egt's but my plugs told me enough that it was too lean, my fuel pressure tested at around 46psi and from what i understand the settings should be at stock with the attitude controller at its lowest settings, that being said this is not the first time i have heard of this. Let me know how yo make out, thx.

 

[AaronBND]

Good to know Sandman. We run the same state playground so should be fine. Thanks!

Kane, what altitude you ride at there in BC and what octane fuel? I think I will tune regulator to run just slightly fat in the mid RPM range where it gets hot before valves open. Our WOT pulls are no more than 10-12 seconds so should be fine. We'll see? I will let you know. The problem I am finding with the Attitude box is even at stock settings, the way it is programed it still runs way to fat and you have to pull with the regulator, but 36psi is ridiculous. What if the box fails at 36psi??? I would rather rely on the stock ecu fuel settings and fatten it up with more pressure for safety.

Aaron

 

[AaronBND]

So went out today to test. I was right at 5500 feet. Started at 45psi and mid-range was pretty lean. Ended up at 50psi to where the plugs were a light brown at around 5800-6000rpms where temps get hot. I am creeping up around 1240 or so on the egt's which is ok. Must have pulled plugs 15 times in an hour checking. I can say that it is not as clean running all the way through the rpm range. Had some burbling and tinty lean spots at certain places. I am going to try it and see how it does the next couple rides. We boondock a lot and I don't want it loading up down low creeping through the trees. I did leave the box in there and it would only take me about 5 minutes to hook it back up and drop pressure back down to 35psi if I need too.

Aaron

 

[kane13]

I ride about the same elevation you do Aaron and i run 91 octane, my box should be back next week sometime so i too will be doing some more testing i guess before i go for a long day ride but i am hoping it works out if i have to get a regulator i guess i will but i sure hope i don't have to bring my pressure down that low as well thats pretty low, thx again for the info. Just thought i would add mine was lean in the mid range as well at about the same rpm but it got worse at high rpm's.

 

[AaronBND]

Just an update for guys that are forum searching and are running the Attitude box on the M1000. I rode 4 times this week, of which the first 2 rides were trying to tune it with just the fuel pressure regulator. Had to run it at 50psi for it to even be safe and it ran terrible down low. I ended up plugging it back in. I guess I will leave well enough alone and just continue to run the box. Here's is what I have:

- 5-8K elevation
- Full SLP Exhaust w/ Timbersled intakes
- '08 ECU Mapping

Here are my Attitude box settings:

- 36psi on fuel pressure regulator (if you are new to the box I would start at 42psi and work your way down.)

- Green - off (fast blink)

- Yellow- off (fast blink)

- Red 2.5

- Yellow/Blue- 4.5

- Red/Blue-6.5

Run's strong and like a champ! Good luck...............

Aaron