Air /fuel for a 100 hp dry shot.
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Air /fuel for a 100 hp dry shot.
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...
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...
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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.
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.
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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
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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
Figured I post up since not many people would say much
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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
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
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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 .
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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
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
Last edited by Beer99C5; 04-14-2010 at 07:10 AM.
#15
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).
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Not the only one running a little leaner I guess...
https://ls1tech.com/forums/nitrous-o...-dry-shot.html
https://ls1tech.com/forums/nitrous-o...-dry-shot.html