now that i've finally got my fuel dialed in and my afr where i want it...i'm ready to put my zex nitrous kit on. i think i'm going to start small with just a 50HP shot. What all should I adjust in my tune to get the best results. I'm pretty sure I'm gonna need to retard my timing a couple degrees...what would be the best way to do that? i'm not quite sure what table or function needs adjusted to do so.

_________________
1989 Mustang GT 5-speed - 306/e303 cam/twisted wedge heads/30# inj./gt40 int./70mm TB/75mm ProM meter/BBK 190lph pump/innovative wideband/QUARTERHORSE/Binary Editor[/i][/i][/i][/i][/b][/b]

I forgot to mention its a wet kit. I'm also already running a step colder plug. I'm hoping that the jets will keep the AFR pretty close to where I'm at now...but what would be the optimal AFR to shoot for...12.5 or so?

_________________
1989 Mustang GT 5-speed - 306/e303 cam/twisted wedge heads/30# inj./gt40 int./70mm TB/75mm ProM meter/BBK 190lph pump/innovative wideband/QUARTERHORSE/Binary Editor[/i][/i][/i][/i][/b][/b]

Pretty sure for N20 or any power added, you want to target, 11.7 - 11.8.

You shouldn't have to add any fuel with a wet kit. Just run stock timing and see how it is.

_________________
1993 Reef Blue Coupe
Thumper Ported E7's
Cobra Intake & 65mm TB
Crane 2031 w/1.7's
30lb Injectors (Slim Line - BB302)
LMAF (02 Lightening Curve) Leaned out 5%
190 lph fuel pump
Kirban Fuel Regulator
A3M computer
EGR only, no Smog
10 degrees base timing
39 PSI fuel pressure no vacuum/32PSI with vacuum (at idle)
BBK 1 5/8 shorty headers
T5 Tranny 3:55 rear
Innovate MTX-L Wideband & QH/BE

For a 50hp shot of nitrous you will not need to decrease the timing as the decreased temp of the aircharge will prevent detonation with such a slight power increase. As far as target AFR is concerned I usually end up with around .5 AFR richer than what you are running NA but reading the plugs will tell the story and is the only way to tune nitrous IMO.

BTW I would suggest correcting your target fueling with jetting rather than in the calibration.

_________________
STLMustangs
Dealer and Tuning Support for DiabloSport,TwEECer, Moates, SCT & HPTuners

I got the system hooked up last night and I'm definitely gonna just start with the 50 shot. I haven't messed with the timing on this car yet so its still stock. Hopefully I'll be fine where I'm at esecially with that small of a HP increase. I think its recommened 2 degree of retard for every 75 HP or so...we'll see how it goes.

_________________
1989 Mustang GT 5-speed - 306/e303 cam/twisted wedge heads/30# inj./gt40 int./70mm TB/75mm ProM meter/BBK 190lph pump/innovative wideband/QUARTERHORSE/Binary Editor[/i][/i][/i][/i][/b][/b]

2 deg timing for every 50 hp