slowec

iTrader: (9)

Need some info on what a/f to have the tune running at before injecting a 100 hp dry shot in the mix. Z28 in sig.

Please don't post your guess, I am looking for help from the people who have tuned a dry shot before and have a solid knowledge of where I should start.
THANKS...

Beer99C5

iTrader: (21)

From the looks of it, your doing a Dry Plate, after the MAF so should we assume you are using the interface?

If using the interface, set the DIP switches for the size shot you intend to use.

When you spray, you will see the car go into PE mode which will likely command somewhere 12.8-13.1. You should see the AFR go from 14.6 or so (idle) to probably somewhere high tens, to elevens. Most would agree you should shoot for 11.5-12 for AFR in the upper RPM range.

slowec

iTrader: (9)

I am using a 98 pcm so my tune will be what ever I set it at. I was running on a mail order tunes fuel map and was alwats a steady 11.0 under any decent throttle input. I have since tuned the car to run 12.8 and it does. I thought I'd start with the old fat map and dial in the 100 shot in open loop tuning. I am throwing the map out the window. I'll change my tune when the weather changes. I have no electronics to change timing or fuel other than EFIlive and a lm1 wired serial to the V2. I have no idea what fuel pump is in this car , but it ran 10.9 @6700 on the dyno steady with no leaning out on the big end so it must be keeping up. I am running FIC 36Lb injectors. Thanks for your input as I have read many of your post in my searches

slowec

iTrader: (9)

Nobody has tuned for dry spray before?

slowec

iTrader: (9)

tuned the PE to 11.5 to 1 and the 75 dry shot goes to mid 13's VERY briefly and settles @ low 12"s and slides richer to low 11's @ 6400. NO KR the whole run. Normal driving to work is rarely a problem because i don't get in pe on my drive in. Runs strong on the 75 shot. breaks street tires loose at 65mph. Put my drag radials on for further testing tho.

Figured I post up since not many people would say much

FiredUpZ28

Wow frankly Im suprised you even feel a 75 shot.

slowec

iTrader: (9)

I do it dry. You will feel it !!!

SkullV

iTrader: (11)

Why would you feel a dry shot any better then a wet shot? The nitrous should hit the same either way, the difference is just how your fueling compensates for the nitrous.

camscam02

iTrader: (21)

The tune should be the same nomatter if it is wet or dry and should gain exactly the same, they just get fuel in different ways. if going through the maf it will add fuel itself, may have to mess with nozzle placement to get it decent if not add fuel via the pcm.

id shoot for low 12 if you are tuning with just afr on that 100 shot. thatll put in the ball park. and id pull a few degrees of timing as well on non projected plug.

good luck

slowec

iTrader: (9)

Because my dry shot is tuned at 12.5 and most wet kits come jetted so fat they are in the 9's or 10's My 02 cents

Chris@NitroDaves

No matter if it's a dry shot or wet shot the AFR we like to shoot for on Nitorus is 11.4-11.8 Ratio.

SkullV

iTrader: (11)

I was waiting for someone to set this dude straight.

slowec

iTrader: (9)

If I was tuning a customer's car with a 150 on it, I would tune that rich as well. This is my ride and it is scanned, logged, and monitored with a wideband daily. It simply runs stronger in the low twelves than the mid elevens and I don't have a hint of KR.

SkullV, For the record, I have not been set straight. I will continue to tune to what my set up likes.

Disclaimer for newbies- I am well aware that 11.5 is considered a SAFER a/f than 12.5 .

Beer99C5

iTrader: (21)

Lil something I made from some research...

This is a Nitrous AFR calculator.

You can use it if you like. If not, consider it for entertainment purposes only. Numbers fall in line with what most folks say.

Nitrous AFR calculator <---link to excel sheet

SkullV

iTrader: (11)

I was speaking more along the lines of wet kit jetting/your claim that you will feel a dry shot more. My wet kit from N2O outlet came jetted at 11.2...its now at 11.7 but what matters more is that the plugs look pretty good.

If you want it at 12.5 and your plugs look good and your afr is right then more power to you (no pun intended).

slowec

iTrader: (9)

Not the only one running a little leaner I guess...

https://ls1tech.com/forums/nitrous-o...-dry-shot.html