Do I need a Fuel programmer??? Air Box Mod, Exhaust gutted

[Yamaha Man]

Hey guys,

I made my own air box mod last year and gutted my exhaust. At take off I could feel my sled choke out, if I put the flipper right to the bar, from dead stop. It was acting as if it wasnt getting enought fuel.

I was wondering if I just adjust the fuel going to each cylinder on the Apex gauge if that would be enough, to fix my problem? If so, to what number? (+#)

Thanks in advance guys!!

John

 

[ROCKRTX]

yes the p.o.d adjustment will cure it,but it only affect bottom to mid range,no effect on top end.

you will have to experience with #,each sled is different.

you can began with +5 and add more if necessary.

 

[Turk]

you really really need some kind of fuel programmer. call Al Ulmer; tell him your mods & he willl send you a pre-programmed box to cover your modifications to the sled.

 

[ROCKRTX]

you really really need some kind of fuel programmer. call Al Ulmer; tell him your mods & he willl send you a pre-programmed box to cover your modifications to the sled.

Turk,Why do you recommend fuel programmer?

Ulmer recommend adjusting fuel from the gauge for air box mod,and you could add more if needed for exhaust.

The problem is only from dead stop.should be fix easely with the gauge.IMO

 

[Yamaha Man]

Im hoping the gauge adjustment will work. Im not worried to much about top end. I ride in pretty wooded areas, Tug Hill, NY. Thanks for the imput guys, love this site!!

 

[ROCKRTX]

Keep us posted with your result.

 

[Yamaha Man]

will do...all I need is SNOW!!! haha

 

[SledFreak]

you really really need some kind of fuel programmer. call Al Ulmer; tell him your mods & he willl send you a pre-programmed box to cover your modifications to the sled.

Turk,Why do you recommend fuel programmer?

Ulmer recommend adjusting fuel from the gauge for air box mod,and you could add more if needed for exhaust.

The problem is only from dead stop.should be fix easely with the gauge.IMO

The PCIII Allen uses allows the fuel to be increased every 50-100RPM all the way from 5000RPM - up to 11000rpm. He also pulls fuel away from the top end. You cannot do that through the pod. The pod really only works just off the throttle.

 

[ROCKRTX]

you really really need some kind of fuel programmer. call Al Ulmer; tell him your mods & he willl send you a pre-programmed box to cover your modifications to the sled.

Turk,Why do you recommend fuel programmer?

Ulmer recommend adjusting fuel from the gauge for air box mod,and you could add more if needed for exhaust.

The problem is only from dead stop.should be fix easely with the gauge.IMO

The PCIII Allen uses allows the fuel to be increased every 50-100RPM all the way from 5000RPM - up to 11000rpm. He also pulls fuel away from the top end. You cannot do that through the pod. The pod really only works just off the throttle.

I state in previous post that the pod won't do nothing in top end.

Yamaha man only want to get rid of the bog at dead stop,he can increase fuel on the pod up to +20 on each cylinder!
I just try to stick to the topic on what the guy ask for.

Now for the rest of the power curve if he got lean mid and rich to top,PCIII with the good map will cure the problem.

 

[SledFreak]

On a totally stock sled, you can still may have a bog of the line. They are that lean on the bottom. The Pod will cure that.. After doing an airbox mod, and exhaust mod, it's pretty much lean everywhere and a PCIII is required. Yes you are right though. From a dead stoop the pod will cure the issue on a stock sled. I don't think it will give enough fuel with an airbox mod and exhaust mod. IMO.

 

[Yamaha Man]

So am I running a risk of blowing up my sled?

 

[SledFreak]

Well, I can't answer that, but I will tell you it's probably not a good thing for it. You need to run an air fuel ratio guage on it to see how's really running. I believe Allen Ulmer could anser it though. Give him a call.

 

[GotJuice]

rich or lean...

wouldn't running a higher octane fuel be similar to running a richer fuel setting on the fuel box with stock timing and compression? The fuel burns slower creating a richer fuel charge. Seems like I read this in depth explination from Freddy or one of the top tuners explaining this is why these motors perform better on 87 octane and when you increase the octane it creates a similar effect of richening the mixture. I know we add Tolene to our SBC strokers to richen them up when they are running a bit lean and they will start smoking a little black and actually load up a little if we add to much....so in theory this should help in a lean situation.....comments?

 

[Yamaha Man]

Not sure...but sounds good!! : ) lol

From what I hear I have mine set way too rich now (+25)

Im going to try to back it down to +10
and see what happens

 

[**sj**]

Re: rich or lean...

wouldn't running a higher octane fuel be similar to running a richer fuel setting on the fuel box with stock timing and compression? The fuel burns slower creating a richer fuel charge. Seems like I read this in depth explination from Freddy or one of the top tuners explaining this is why these motors perform better on 87 octane and when you increase the octane it creates a similar effect of richening the mixture. I know we add Tolene to our SBC strokers to richen them up when they are running a bit lean and they will start smoking a little black and actually load up a little if we add to much....so in theory this should help in a lean situation.....comments?

a slower burn i.e. preventing pre detonation or preignition is not a cure for a lean situation ( air to fuel ratio) reducing the air or adding fuel is the cure..just the same as adding fuel doesnt solve preignition or predetonation...
also...Toulene (also known as tetraethyl lead substitute?) helps preignition/predetonation. the real t.e.l. solves the pre's for sure and adds lubrication to a motor...
the ability to add or remove fuel in small increments makes getting the most out of these motors much easier.