I hope you are seeing mid 11's for AFR when at wide open. What fuel pump do you have? 67psi at idle is high!

 

I would assume you watched the gauges vid I posted since you know I was running 67psi of fuel pressure, this means you should know that I'm not seeing mid 11's for AFR @ WOT. I'm guessing you're trying to be sarcastic for some reason?

If you have the TVS 2300 kit from Magnuson, I would assume it's the same as yours unless you changed it...Walbro 255

As you know, I know very little about these things and am just learning as I go along here, but common sense tells me the fuel pressure is so high possibly due to the stock regulator OR since Zippy added a huge amount of fuel before filming that vid to see if he could get it to run richer - all this was explained in my previous post.

 

You have some stuff to work out man. Like state above, the 67psi is too high. I'm guessing this is a returnless fuel system with the stock regulator? If so, you should get an aftermarket regulator so it can regulate pressure like it should. GM vehicles run fuel pressure at 58psi. Adding fuel in the tune has nothing to do with fuel pressure. The tune only controls injector pulsewidth, not the pump. So adding fuel to the tune would only make the injectors inject more fuel making it rich. The fuel pump runs at a constant speed continuously.

As far as your tune, like stated above, your tune is pretty far off. If Zippy added a bunch of fuel to the tune before making that video, then damn, I wonder how lean it was before. Mid 12's AFR is just too lean for running any kind of boost and pump gas. You need to get that thing down to mid 11's and then get your timing squared away. I'd be scared to romp on the throttle with it being that lean. Especially going WOT a couple times in a row. With an already warm cylinder and a lean AFR, that thing might preignite and blow

 

^^This - Yes, I'm well aware of my fuel system issue. Lonnie is building the double pumper bucket, regulator, in-line filter and Teflon lines so I can run e85. ...and I was running 110 race fuel mixed w/BP 93

It sounds to me like you guys are knocking on Zippy's tuning, which if that makes you guys feel better, so be it. He is still my tuner and that isn't going to change anytime soon. I trust his judgment and still believe he is the best performance tuner around for SSS trucks. When I get my fuel system upgraded and am able to run 15 psi too, I'm anxious to see how my Zippy tuned truck stacks up against Rob's awesome run of 11.6 ...without methanol of course

If you're wondering how lean it was running before, scroll back a few pages where I posted a the vid 0 - 109 in 10.67. That was the start up tune he gave me right after the cam was installed. He then sent me a couple of more tunes adding fuel gradually and the AFR was only dropping slightly to high 12's - then is when he added all the fuel as a test to see if I was completely out of pump or not.

 

Sorry I bought a tuner kit, no fuel pump. I have dual pumps, my idle pressure is 60 psi (2nd pump on hobbs switch). The tune has nothing to do with your fuel pressure. Also you said that the video was before Zippy made changes correct? So if that is the case then how would I know that you are not seeing mid 11's now? I am not being sarcastic, I am trying to help you. If your truck pops then at the end of the day it doesnt effect me. Just trying to point stuff out before you find out the hard way.

 

Yea I live to knock on Zippy... I've never met him, never heard a bad thing about him, and he is local to me. So not sure why you think I'm after your BFF.

You said yourself, you don't know much about this stuff, and you are learning. That is why we are commenting in your thread. To push you in the right direction. If something needs attention, we are going to let you know. Is that not the point of this forum? So don't get offended when we don't praise you.

So to say it again, based on the vid you posted, your tune is off. In your case, there is no reason to be running it that lean.

 

Sounds like you have all the answers, so have fun and good luck.

 

Maybe you missed the last page where you asked if I was running lean and I responded with the vid telling you it was running in the mid 12's. I don't know exactly what changes were made to the tune after the vid, but it was still mid 12's at the track.

bottom line is my tune is off due to my inadequate fuel system, not due to Zippy's incompetence. When I spoke to Lonnie last Sunday, he told me my regulator could cause the fuel pressure to be too high, which is why I said that earlier.

 

I wasn't referring to you. ...and I'm not mad or offended by anyone's comments. I always welcome them whole heartedly.

 

No one said zippy is incompetent. He is a proven tuner who you should trust. He just doesn't have it dialed in yet. It is not lean because of your fuel system. Yes it is weak and a contributing factor but your fuel pressure isn't dropping low enough to tell me it is just plainly running out of fuel.... He is adding more fuel each time as you stated and the AFR's are dropping. So that alone should prove what I'm saying. He needs to add more fuel at WOT. He probably just needs more logs and tunes swapped to get it closer.