ShiznityZ28

iTrader: (11)

Thats the point there is no perfect a/f the plug tells you if its happy. nothing tunes like the plug.

WE TODD DID

iTrader: (2)

A/F ratio isn't whats important in a nitrous application, its the n/f (nitrous/ fuel) ratio that is important. The only way to know that is to know the flow rates of the jets that you are using with a given fuel pressure, along with the orifice in the solenoids, lines sizes, bottle pressure, etc. Richer is NOT better with nitrous, period. The only "safe" tune is the correct one, which involves reading the plugs, not an oxygen sensor.

Just as an example, when the tune-up on most of the engines that I tune is right, the a/f ratio is usually in the high 13's-mid 14's.

jetblast

i would retard the timing by at least 3 deg. and your afr should go a little richer, stock tunes are relatively safe but i don't think they are safe enough for 100 shot. the timing table needs to be touched up. i know for me, when i run on the juice the eng. rides on cells that it doesn't normally see in n/a form. i certainly believe that it's true what they say about cutting and inspecting the plugs, but on the 100 shot you should be ok, if you just run 11.8 to 12.3 off the wb, the timing is equally important.

ATVracr

iTrader: (5)

A wideband sensor is not in the combustion chamber, plugs are and they will be more accurate then a wideband can be.

Figure out what the motor wants by the plugs and record what the A/F is when the plugs are right then you can monitor the A/F for changes.

gold98Z28

iTrader: (7)

well from the looks of that graph, either the wideband is off or it too lean on motor to start with. IF its safe on motor the nitrous fueling looks to be in decent shape. read the plugs and see where you are at. make sure you dont idle the car befor shutting it down. make a pull, or WOT pass and shut it down, pull a couple plugs. go from there

howellusn

iTrader: (6)

14.7 is stoich na is it not?? it was a 14.2-14.3 so it should be fine. Thats a stock tune there

gold98Z28

iTrader: (7)

yes that is stoich, but WOT is not stoich. when in PE (Power Enrichment,wot fueling) it should be much richer than stoich, and a stock tune is usually too rich and not very flat..... the differance between the too pulls is what im going off of, not the actuall numbers. i think those numbers are off quit a bit

jetblast

that makes so much sense to me, but don't you think it's overkill for a 100 shot and say 12.3 afr and good timing, or is there more hp by reading the plugs even on a 100shot? i mean how risky is it just to settle at 12.3 with the wb.

ATVracr

iTrader: (5)

As long as the sensor is good I dont see a problem with it.
Its hard to hurt something with a 100 .... you have to be WAY OFF with the tune.

There might be a few HP in dialing it in perfect.

jetblast

thanks man! ^^