FASTFATBOY

iTrader: (23)

I know there are different A/F ratios for the spray just like there are for N/A...what are they?

Max SAFE HP=?

Max HP=?

Also can you tune N02 with the factory O2 sensors and a datalogger...OR do you need a standalone that is seperate?

Thanks

David

jmill96Z

iTrader: (3)

I always shoot for 12.7 on motor and 11.5 on the spray.

TwistedSS

iTrader: (3)

Search.

FASTFATBOY

iTrader: (23)

I did....not much I saw.


Alot on Normally aspirated A/F ratio....not so much on N02 A/F ratio.


David

GueSS Who

12.7:1 on motor
11.0:1 on 500 shot

I use a standalone computer with dry kit. I use a Wideband with a BS3.

Slvr00Bird

iTrader: (2)

I just read a thread where Nitro Dave recommended 11.8 for A/F on spray..

I'm not that knowledgeable with nitrous, but he seems to be a great sponsor and definitely seems like a guy I'd listen to.

Crowder

iTrader: (6)

id stay around 11.5s on the jug

chad rock

I hear max hp 12.0 but tnt says no leaner than 11.5 but they also say use stock timing with a 100shot so really dont know if thats why they say 11.5

383LQ4SS

iTrader: (33)

best AF ratio is dependant on several factors. Size of the shot is a huge factor. A typical 100 shot on a bolt on F body would probably be fine on 12.0. But as HP goes up....your target AF ratio should slide down. This is not only for safety...but best power as well. Do not be afraid of running a little rich and using higher octane.

I would say (in general) for a 100 shot shoot of 11.8
for a 150 shoot for 11.5
for a 250 shoot for 11-11.2
for a 350 or greater 10.5-11.0

Alot of serious big shot guys are tuning by weight ratio (when flowing the kit) and forgetting all about AF ratio. Sometimes by these calculation they are ending up very rich (when measured with a wideband) and runnig very well.

But even these are generalizations and can change based on your timing, compression, octane, cam, etc etc. But they are in the general ball park.

Robert56

iTrader: (2)

Just remember, you'll as you go leaner you'll make more power, but on the down side you'll have less room if tune is off or something goes wrong. The ratio's given are pretty good guide lines for the average street/strip guy. Mine is currently n/a in the 13.x:1 realm, a little on the ragged edge for some, but I have some excellent tuners on my side and a motor that was built to handle 1000rwhp. On the spray, tuning my 300rwhp shot I like to stay in the low 10.x:1 area for now. However, I am confident that we will be moving that to the high 11's, like 11.8:1 or even very low 12's, yes pushing it a bit for most, but... It also has to do with how the motor was built, a specific n2o motor like mine can take the higher cylinder pressures, whereas, a stock block the tune would be different at these levels. Start safe until you have the knowledge to push it a bit. Richer will be less power, but you'll live longer.
Robert

Beer99C5

iTrader: (21)

Info I got from Doc and converted to a excel spreadsheet for calc, AFR on spray. Pretty simple and falls inline to what everyone is saying.

Beers Nitrous AFR Spreadsheet <<<--Right Click then Save Target As, just like your favorite adult site

383LQ4SS

iTrader: (33)

Robert...I will bet you some cash that thing will make more power down the strip closer to high 10s low 11s than at 12.0 to 1 with the 300 shot.

When you get that 300 ready.. start tuning and when the timing is right you will see large gains in power in the right AF range on a shot that size. I bet anything over 11.8 you will start declining in power. Especially at the track.

Thats just my experiance...but id be willing to put some cash on it.

FASTFATBOY

iTrader: (23)

These are the EXACT answers I was looking for.

Can you tune No2 with factory 02's? Or do I need a wideband?



THANKS

David

dlove

iTrader: (23)

iv had best luck with it being a little richer

xBROKEx

iTrader: (7)

right before it starts detonating

Jpr5690

iTrader: (13)

Gotta Pay To Play.. Keep It Safe Imo Why Go For That Last 5-10 Hp When There Is A Much Greater Risk Of It Poping The Motor....

For The Stock Short Block Id Say 11.2 To 11.5 Is A Good Target For Most Reasonable Sized Shots

Jpr5690

iTrader: (13)

My Question Is How Much Timing (in General Should You Pull)

Dose The 2 Deg For Every 50 Hp Hold Up For Every Lsx Car ?

Ray@Nitrous Outlet

A wideband is the best way of tuning exact A/F...or you can go off the plugs.

I would not rely on the narrow band OEM sensors.

xBROKEx

iTrader: (7)

yeah all a narrow band does is look pretty with flashing lights