Really? Why would Nitrous Express recommend pulling timing for even a 50 shot? I guess they have no idea what they are talking about
All nitrous companies will recommend that you pull timing with any shot.....of course.... it's called a legal disclaimer. As long there is nitrous oxide kits sold, there will always be the brilliant ones who install or use them wrong and then try to blame the nitrous comapanies for their incompetence. BTW, what personal tuning experience do you have with tuning these cars on nitrous? We have data logged several 4.6 2V's with less than a 100 shot and full total timing with never a single hint of detonation....you don't have to touch the timing on these cars with just a 75 shot. That 2° per 50 shot "general rule of thumb" rule was introduced by Jeff Prock years back and it appied to carbureted cars not EFI cars. Carbureted cars rely on vacuum or centrifugal advance to apply timing advance and ultimately total timing. EFI cars obviously have their timing controlled by the computer.
On these cars with a small 75 or 100 shot, all you have to do is focus a few tables such as the global open loop fuel multiplier, WOT fuel multiplier, fuel load scaling, and the high/low injector slopes to dial in the a/f ratio on the wideband.
You may not have problems now, but I guarentee you WILL have future problems. Stock timing on a 125 shot is idiotic. Hello detonation, bye-bye engine
Kevin has run over 10 10lb bottles that I know of through his '01 in just the last 3-4 months. We have never had one single hint of detonation or detonation induced pre-ignition. None of the 125 wet shot cars we have tuned have had the timing touched....you just don't have to if you know what you are doing. Wet hits aren't as sensitive to timing advance and total timing as dry hits are. Over 125 on a dry hit...then we'll start to play with the spark tables as needed. I'd also suggest that you watch how you throw around the word idiotic. No need for that
Please share with us any personal experience that you have with tuning nitrous cars that may provide some differing evidence.