A/F ratio for spray

suprakid366 · November 8th, 2009, 05:20 PM

Well im gonna be ordering my wideband tomorow and by the time it gets here i want to know what i should get my A/F ration to when spraying a 50 shot then a 75 shot. Oh and an idle A/F and when i let of the gas/spray.

So anyone know?

***c-man*** · November 9th, 2009, 02:09 AM

I'd watch to make sure it stays in the 11-12 range. If you're getting to 12.5+, I'd pull fuel.

I'd just tune if for n/a though and use the plug readings to tweak the nitrous jet combos.

KLDE Wagon · November 9th, 2009, 10:07 AM

Quote:

Originally Posted by c-man

I'd just tune if for n/a though and use the plug readings to tweak the nitrous jet combos.

Make sure you have a few jets higher and lower for both the fuel and nitrous. This will allow you to fine tune it without making big jumps. Big jumps= bad news on nitrous applications.

Also make sure your intake clamps are Really tight and you don't spray too soon (keep it above 3K at the bare minimum). I've found out the hard way

Jeremy

U2SLO · November 9th, 2009, 11:02 AM

Quote:

Originally Posted by KLDE Wagon

Make sure you have a few jets higher and lower for both the fuel and nitrous. This will allow you to fine tune it without making big jumps. Big jumps= bad news on nitrous applications.

Also make sure your intake clamps are Really tight and you don't spray too soon (keep it above 3K at the bare minimum). I've found out the hard way

Jeremy

What happens if your below 3k?

KLDE Wagon · November 9th, 2009, 11:16 AM

Usually it will backfire if over a 50 shot. Blows the intake tube apart and bends your VRIS butterflies. The motor can't consume it all quick enough and really you're just wasting it

Jeremy

P.S. See, look: http://videos.streetfire.net/video/K...ous_714016.htm

suprakid366 · November 9th, 2009, 11:57 AM

Quote:

Originally Posted by c-man

I'd watch to make sure it stays in the 11-12 range. If you're getting to 12.5+, I'd pull fuel.

I'd just tune if for n/a though and use the plug readings to tweak the nitrous jet combos.

Ok stay in the 11-12 range while spraying? And then if im at 12.5 reduce the fuel? I dont like the plug readings, just always seems faulty. When i put the new plugs in a while ago and didnt even spray they were all completly white. Put afpr in and they arnt so white anymore, but they still get white when i drive around.

Just for the record.. Higher number is rich and lower number is lean?

KLDE Wagon · November 9th, 2009, 12:13 PM

Plugs are THE way to know what is going on if you can read them right. White and brown is good. White with brown spots is bad.

No, it's a ratio of air:fuel. 14:1 is lean (less fuel for the amount of air) while 12.5:1 is richer (more fuel for the amount of air). Closer to 1:1, the richer it is.

Jeremy

ademan · November 10th, 2009, 12:49 PM

Quote:

Originally Posted by suprakid366

Well im gonna be ordering my wideband tomorow and by the time it gets here i want to know what i should get my A/F ration to when spraying a 50 shot then a 75 shot. Oh and an idle A/F and when i let of the gas/spray.

So anyone know?

i kept my as close to 13.1 as possible, i was able to keep running 113shot cold fusion jet on my stock 110hp n/a motor. running more nitrous than the motor output is never recomended but hey its a low compression motor and still running strong

***c-man*** · November 10th, 2009, 01:22 PM

Quote:

Originally Posted by c-man

I'd watch to make sure it stays in the 11-12 range. If you're getting to 12.5+, I'd pull pull nitrous/add fuel/a little of both.

I'd just tune if for n/a though and use the plug readings to tweak the nitrous jet combos.

Sorry. Typed from blackberry...auto correction didn't like my "/" ...pull nitrous/add fuel/a little of both.

JKpgt96 · November 10th, 2009, 03:54 PM

my car is tuned for 12.0-12.3 on the jug..

GlickPGT · November 10th, 2009, 06:44 PM

Exactly how necessary is it to tune? I've never really heard of anyone tuning for nitrous before now.

suprakid366 · November 10th, 2009, 07:31 PM

Ok thx guys for the help. But these numbers are coming from when you are actually spraying correct? Like his-

Quote:

Originally Posted by JKpgt96

my car is tuned for 12.0-12.3 on the jug..

JKpgt96 · November 10th, 2009, 10:18 PM

..yes thus the 'on the jug' part.

Glick how have you not heard of one tuning for nitrous? you have to tune to for in one way or another!

KLDE Wagon · November 11th, 2009, 12:49 AM

The manufacturers do a good job providing you with the correct jet settings most of the time but to get to most out of it you need to know what your air/fuel is doing and pull some timing to be safe.

Jeremy

GlickPGT · November 11th, 2009, 05:45 PM

I'm not experienced in the area, but you're changing permanent settings for a temporary fuel condition. To me it just doesn't make sense.

**Disclaimer**
I am NOT experienced in this area, at all.

suprakid366 · November 11th, 2009, 06:39 PM

Quote:

Originally Posted by GlickPGT

I'm not experienced in the area, but you're changing permanent settings for a temporary fuel condition. To me it just doesn't make sense.

**Disclaimer**
I am NOT experienced in this area, at all.

Its because its still sometype of power adder. Not exactly forced induction, but any big power adder u should "tune" it to the right settings. More air/fuel= bigger boom and more heat so u need to control that boom and heat. No matter how temporary it is. As far as i understand it, all ur really changing is the fuel pressure with an afpr, but thats not even needed if u have a wet kit. And then u are also chaning the fuel/nitrous jets.

JKpgt96 · November 11th, 2009, 07:02 PM

Quote:

Originally Posted by GlickPGT

I'm not experienced in the area, but you're changing permanent settings for a temporary fuel condition. To me it just doesn't make sense.

**Disclaimer**
I am NOT experienced in this area, at all.

If you are not experienced then stop commenting!

Yes it is for a temporary condition, but that 'temporary condition' will non-temporarily end your engine's life. You only would be changing the Fuel Pressure if you are not using megasquirt and only while on the bottle. Otherwise you would have a different map in your MS for nitrous.

***c-man*** · November 11th, 2009, 11:27 PM

I stopped reading at ..I'm not experienced. Please stop posting in this thread.

KLDE Wagon · November 12th, 2009, 01:01 AM

Haha. You don't tune any different while not on the spray, only while on the spray.

I.E. you don't just up the fuel pressure to get more fuel, just as you don't on a boosted car cause when you're not boosting (cruising and idle) your car will run like balls cause it will be rich. An FMU adjusts fuel pressure to boost pressure, that's the cheap way of getting more fuel on a boosted car.

With that said, MS can switch fuel maps when the nitrous is activated OR the cheaper way is to just adjust the fuel jet on your wet kit, with a dyno and a wideband. If you're rich with a .024 jet, switch to an .023 and run it again!! That's called tuning too

Jeremy

***c-man*** · November 12th, 2009, 01:40 AM

^^^ or fork over a c-note and a handful of jets and I'll tune it for you.

Jarod7920 · November 12th, 2009, 01:01 PM

Yes....lets all resort to a haphazard tuning method cause that is the best forward progression i know of!

suprakid366 · November 12th, 2009, 06:52 PM

alright just opened my wideband and holy hell, my jaw dropped. Read through the manual and theres alot of crap u have to do for this thing. Cant believe i need to wire in this push button thing with an LED. The software is cool tho. But anyways whats the best stock o2 sensor to remove for the wideband one? The front one or the rear one?

JKpgt96 · November 12th, 2009, 06:56 PM

if you have no leaks just plug the two and have a bung put in before the cat

suprakid366 · November 12th, 2009, 07:03 PM

what? cant i just take out a factory 02, and replace it with the wideband one? And leave the other factory 02 in and wired up?

JKpgt96 · November 12th, 2009, 07:38 PM

why only read from one bank? it would cost you like 10 bucks to have a bung welded in so you can account for both banks..

November 8th, 2009, 05:20 PM	#1
suprakid366 Supercharged Member Join Date: Oct 2007 Location: Pewaukee/Elkhorn WI Age: 19 Posts: 1,328 iTrader: (6)	A/F ratio for spray Well im gonna be ordering my wideband tomorow and by the time it gets here i want to know what i should get my A/F ration to when spraying a 50 shot then a 75 shot. Oh and an idle A/F and when i let of the gas/spray. So anyone know? __________________ 95 whitePgt, Fstb, Rust free Moonroof mod Polk Audio db 12"s, Alpine 850 Amp, Speedhut overlay, HIDs, Custom VRS catback, Headers, JJ Resonated Testpipe, CAI, DXD stage 1, Mx3 fly, RR inserts, Trans saver, V-powers & wires, Afpr, Newest mod- LC1, Zex'd ....best so far a 14.9@96

November 9th, 2009, 02:09 AM	#2
*c-man* Moderator Join Date: Feb 2000 Location: Huntington Beach Age: 30 Posts: 21,324 iTrader: (14)	I'd watch to make sure it stays in the 11-12 range. If you're getting to 12.5+, I'd pull fuel. I'd just tune if for n/a though and use the plug readings to tweak the nitrous jet combos. __________________ Chuck \| ProbeTalk's Mega Moderator \| 2009 Mazda 6 GT \| 3.7L Grand Touring \| 2003 Tiburon GT \| 2.7L GK boost'd \| 1995 Probe GT \| 2.5L ZE nitrous'd \| SOLD!!!

November 9th, 2009, 11:16 AM	#5
KLDE Wagon Juiced Member Join Date: Aug 2006 Location: Binghamton, NY Age: 21 Posts: 825 iTrader: (0)	Usually it will backfire if over a 50 shot. Blows the intake tube apart and bends your VRIS butterflies. The motor can't consume it all quick enough and really you're just wasting it Jeremy P.S. See, look: http://videos.streetfire.net/video/K...ous_714016.htm __________________ 85 Mercury Marquis wagon "Family Truckster": It's boosted, just not running yet! <<<New hot-ness 05 Mazda 3 5-door "Baby": Auto, wheels, HID fogs<<<DD 99 Ford Ranger XLT "Little Foot": Sold for a probe Back to terrorize with drift-eze in the new hot-ness

November 9th, 2009, 12:13 PM	#7
KLDE Wagon Juiced Member Join Date: Aug 2006 Location: Binghamton, NY Age: 21 Posts: 825 iTrader: (0)	Plugs are THE way to know what is going on if you can read them right. White and brown is good. White with brown spots is bad. No, it's a ratio of air:fuel. 14:1 is lean (less fuel for the amount of air) while 12.5:1 is richer (more fuel for the amount of air). Closer to 1:1, the richer it is. Jeremy __________________ 85 Mercury Marquis wagon "Family Truckster": It's boosted, just not running yet! <<<New hot-ness 05 Mazda 3 5-door "Baby": Auto, wheels, HID fogs<<<DD 99 Ford Ranger XLT "Little Foot": Sold for a probe Back to terrorize with drift-eze in the new hot-ness

November 10th, 2009, 03:54 PM	#10
JKpgt96 POC Mod Join Date: Aug 2000 Location: MOPOCland (St. Louis) Posts: 7,659 iTrader: (14)	my car is tuned for 12.0-12.3 on the jug.. __________________ -John Kessler- MOPOC Mod NOT named Jarod '96 PGT- Something NASTY is coming..12:1\|I-beams\|3" Exhaust\|One-off Longtubes\|Custom Cams\|Ported Heads\|Interprep Springs,etc..\|Big Brakes\|custom X-member\|ITB goodness\|Ext. Oil Pump\|10000rpm\|PAR 1-4th & Final\|MFactory LSD\|125 shot.. My '96 GT My Nitrous Dyno Current: Colt Tri-Flow Test Car '02 Nissan Maxima SE- Tint, 6 spd, Stock Maxima E.T. & Trap Speed Record Holder14.01@99.77mph 214whp/233wtq

November 10th, 2009, 06:44 PM	#11
GlickPGT Newbie Join Date: Nov 2009 Posts: 14 iTrader: (0)	Exactly how necessary is it to tune? I've never really heard of anyone tuning for nitrous before now.

November 10th, 2009, 10:18 PM	#13
JKpgt96 POC Mod Join Date: Aug 2000 Location: MOPOCland (St. Louis) Posts: 7,659 iTrader: (14)	..yes thus the 'on the jug' part. Glick how have you not heard of one tuning for nitrous? you have to tune to for in one way or another! __________________ -John Kessler- MOPOC Mod NOT named Jarod '96 PGT- Something NASTY is coming..12:1\|I-beams\|3" Exhaust\|One-off Longtubes\|Custom Cams\|Ported Heads\|Interprep Springs,etc..\|Big Brakes\|custom X-member\|ITB goodness\|Ext. Oil Pump\|10000rpm\|PAR 1-4th & Final\|MFactory LSD\|125 shot.. My '96 GT My Nitrous Dyno Current: Colt Tri-Flow Test Car '02 Nissan Maxima SE- Tint, 6 spd, Stock Maxima E.T. & Trap Speed Record Holder14.01@99.77mph 214whp/233wtq

November 11th, 2009, 12:49 AM	#14
KLDE Wagon Juiced Member Join Date: Aug 2006 Location: Binghamton, NY Age: 21 Posts: 825 iTrader: (0)	The manufacturers do a good job providing you with the correct jet settings most of the time but to get to most out of it you need to know what your air/fuel is doing and pull some timing to be safe. Jeremy __________________ 85 Mercury Marquis wagon "Family Truckster": It's boosted, just not running yet! <<<New hot-ness 05 Mazda 3 5-door "Baby": Auto, wheels, HID fogs<<<DD 99 Ford Ranger XLT "Little Foot": Sold for a probe Back to terrorize with drift-eze in the new hot-ness

November 11th, 2009, 05:45 PM	#15
GlickPGT Newbie Join Date: Nov 2009 Posts: 14 iTrader: (0)	I'm not experienced in the area, but you're changing permanent settings for a temporary fuel condition. To me it just doesn't make sense. Disclaimer I am NOT experienced in this area, at all.

November 11th, 2009, 11:27 PM	#18
*c-man* Moderator Join Date: Feb 2000 Location: Huntington Beach Age: 30 Posts: 21,324 iTrader: (14)	I stopped reading at ..I'm not experienced. Please stop posting in this thread. __________________ Chuck \| ProbeTalk's Mega Moderator \| 2009 Mazda 6 GT \| 3.7L Grand Touring \| 2003 Tiburon GT \| 2.7L GK boost'd \| 1995 Probe GT \| 2.5L ZE nitrous'd \| SOLD!!!

November 12th, 2009, 01:01 AM	#19
KLDE Wagon Juiced Member Join Date: Aug 2006 Location: Binghamton, NY Age: 21 Posts: 825 iTrader: (0)	Haha. You don't tune any different while not on the spray, only while on the spray. I.E. you don't just up the fuel pressure to get more fuel, just as you don't on a boosted car cause when you're not boosting (cruising and idle) your car will run like balls cause it will be rich. An FMU adjusts fuel pressure to boost pressure, that's the cheap way of getting more fuel on a boosted car. With that said, MS can switch fuel maps when the nitrous is activated OR the cheaper way is to just adjust the fuel jet on your wet kit, with a dyno and a wideband. If you're rich with a .024 jet, switch to an .023 and run it again!! That's called tuning too Jeremy __________________ 85 Mercury Marquis wagon "Family Truckster": It's boosted, just not running yet! <<<New hot-ness 05 Mazda 3 5-door "Baby": Auto, wheels, HID fogs<<<DD 99 Ford Ranger XLT "Little Foot": Sold for a probe Back to terrorize with drift-eze in the new hot-ness Last edited by KLDE Wagon : November 12th, 2009 at 01:03 AM.

November 12th, 2009, 01:40 AM	#20
*c-man* Moderator Join Date: Feb 2000 Location: Huntington Beach Age: 30 Posts: 21,324 iTrader: (14)	^^^ or fork over a c-note and a handful of jets and I'll tune it for you. __________________ Chuck \| ProbeTalk's Mega Moderator \| 2009 Mazda 6 GT \| 3.7L Grand Touring \| 2003 Tiburon GT \| 2.7L GK boost'd \| 1995 Probe GT \| 2.5L ZE nitrous'd \| SOLD!!!

November 12th, 2009, 01:01 PM	#21
Jarod7920 POC Mod Join Date: Feb 2002 Location: st. louis Age: 25 Posts: 3,202 iTrader: (10)	Yes....lets all resort to a haphazard tuning method cause that is the best forward progression i know of! __________________ -J-Rod- 301whp 293wtq 9.5psi 14 degrees 93 PGT-T 08 Mazdaspeed 3 GT 280whp/313wtq I can neither confirm nor deny that we may or may not be in what may or may not be a position to either confirm or deny what you may or may not have allegedly alleged.

November 12th, 2009, 06:52 PM	#22
suprakid366 Supercharged Member Join Date: Oct 2007 Location: Pewaukee/Elkhorn WI Age: 19 Posts: 1,328 iTrader: (6)	alright just opened my wideband and holy hell, my jaw dropped. Read through the manual and theres alot of crap u have to do for this thing. Cant believe i need to wire in this push button thing with an LED. The software is cool tho. But anyways whats the best stock o2 sensor to remove for the wideband one? The front one or the rear one? __________________ 95 whitePgt, Fstb, Rust free Moonroof mod Polk Audio db 12"s, Alpine 850 Amp, Speedhut overlay, HIDs, Custom VRS catback, Headers, JJ Resonated Testpipe, CAI, DXD stage 1, Mx3 fly, RR inserts, Trans saver, V-powers & wires, Afpr, Newest mod- LC1, Zex'd ....best so far a 14.9@96

November 12th, 2009, 06:56 PM	#23
JKpgt96 POC Mod Join Date: Aug 2000 Location: MOPOCland (St. Louis) Posts: 7,659 iTrader: (14)	if you have no leaks just plug the two and have a bung put in before the cat __________________ -John Kessler- MOPOC Mod NOT named Jarod '96 PGT- Something NASTY is coming..12:1\|I-beams\|3" Exhaust\|One-off Longtubes\|Custom Cams\|Ported Heads\|Interprep Springs,etc..\|Big Brakes\|custom X-member\|ITB goodness\|Ext. Oil Pump\|10000rpm\|PAR 1-4th & Final\|MFactory LSD\|125 shot.. My '96 GT My Nitrous Dyno Current: Colt Tri-Flow Test Car '02 Nissan Maxima SE- Tint, 6 spd, Stock Maxima E.T. & Trap Speed Record Holder14.01@99.77mph 214whp/233wtq

November 12th, 2009, 07:03 PM	#24
suprakid366 Supercharged Member Join Date: Oct 2007 Location: Pewaukee/Elkhorn WI Age: 19 Posts: 1,328 iTrader: (6)	what? cant i just take out a factory 02, and replace it with the wideband one? And leave the other factory 02 in and wired up? __________________ 95 whitePgt, Fstb, Rust free Moonroof mod Polk Audio db 12"s, Alpine 850 Amp, Speedhut overlay, HIDs, Custom VRS catback, Headers, JJ Resonated Testpipe, CAI, DXD stage 1, Mx3 fly, RR inserts, Trans saver, V-powers & wires, Afpr, Newest mod- LC1, Zex'd ....best so far a 14.9@96

November 12th, 2009, 07:38 PM	#25
JKpgt96 POC Mod Join Date: Aug 2000 Location: MOPOCland (St. Louis) Posts: 7,659 iTrader: (14)	why only read from one bank? it would cost you like 10 bucks to have a bung welded in so you can account for both banks.. __________________ -John Kessler- MOPOC Mod NOT named Jarod '96 PGT- Something NASTY is coming..12:1\|I-beams\|3" Exhaust\|One-off Longtubes\|Custom Cams\|Ported Heads\|Interprep Springs,etc..\|Big Brakes\|custom X-member\|ITB goodness\|Ext. Oil Pump\|10000rpm\|PAR 1-4th & Final\|MFactory LSD\|125 shot.. My '96 GT My Nitrous Dyno Current: Colt Tri-Flow Test Car '02 Nissan Maxima SE- Tint, 6 spd, Stock Maxima E.T. & Trap Speed Record Holder14.01@99.77mph 214whp/233wtq