what should base FP be? 50lb and ultimate

[tnsyty]

I am running the ultimate 3bar with 50lb injectors. what should my base FP be? I have the ATR double pump. I never got any instructions with the ultimate and trying to get fuel dialed in better.

thanks

 

[jwaller]

Re: what should base FP be? 50lb and ultimate

stockish pressure works good for me. 30-35 no vacuum

 

[Big Mike]

Re: what should base FP be? 50lb and ultimate

Here is some more info you may find interesting: http://sytychips.com/50lbdescription.html

 

[tnsyty]

Re: what should base FP be? 50lb and ultimate

Mike, thanks for the info on my setup.

waller, thanks for the FP info. I am pretty sure mine is a bit more than that now.

 

[Davemc1963]

Re: what should base FP be? 50lb and ultimate

I kindly got a copy of the 3Bar instructions from another board member before he sold his Ultimate, and it states that the Base Fuel Pressure for a 3 Bar ultimate should be 50psi without vacuum.
This is obviously a safe starting point and proper tuning with a wideband and datalogging would be the best way to determine what it should be.
Hope this helps Dave

 

[jwaller]

Re: what should base FP be? 50lb and ultimate

I kindly got a copy of the 3Bar instructions from another board member before he sold his Ultimate, and it states that the Base Fuel Pressure for a 3 Bar ultimate should be 50psi without vacuum.
This is obviously a safe starting point and proper tuning with a wideband and datalogging would be the best way to determine what it should be.
Hope this helps Dave

yes thats what it says for the stock ultimate with stock injectors. the 50# stuff is different.

 

[Davemc1963]

Re: what should base FP be? 50lb and ultimate

yes thats what it says for the stock ultimate with stock injectors. the 50# stuff is different.

Oops! Sorry I guess I missed the bit about the 50# injectors. (Just saw the FP and Ultimate reference)
Thanks for the correction John!
Dave

 

[BoostedSUV]

Re: what should base FP be? 50lb and ultimate

I always ran 50lbs with no vacuum with my ultimate and 50lbers? Is that too much fuel pressure? Also I am currently running 50lb base FP as per Nolan on my custom tune. I just put a wideband In the truck so I guess I will start monitoring it and see if maybe I'm running too fuel pressure. Truck seems to stumble sometimes as if its too high but that's where I was told to set it. Interesting...

 

[smeagol]

Re: what should base FP be? 50lb and ultimate

I always ran 50lbs with no vacuum with my ultimate and 50lbers? Is that too much fuel pressure? Also I am currently running 50lb base FP as per Nolan on my custom tune. I just put a wideband In the truck so I guess I will start monitoring it and see if maybe I'm running too fuel pressure. Truck seems to stumble sometimes as if its too high but that's where I was told to set it. Interesting...

My calibrations (the Ultimate setup with 50#) were done with stock fuel pressure (43.5 psi base). If Nolan tuned your truck with 50 psi base, then stick with that. There isn't some weird reason you need to run 50 psi base with the larger injectors.

 

[tnsyty]

Re: what should base FP be? 50lb and ultimate

I think My FP is probably too high, I dropped it down and ran into T1F1 and it got a little knock and black smoke in 3rd., Ran it up to T1 F3 and seems to be running pretty well.