Meth Injection.........HELP PLEASE
Meth Injection.........HELP PLEASE I need to know exactly what do I focus on when installing meth. Do I focus primarily on the AFR decrease or the IAT drop? My IATs were in the upper 180s (CXRacing Intercooler) with two 7 gph nozzles and I saw a .2 to .3 decrease in AFR. I'm going to increase my nozzle size until I achieve a .5 to .7 drop from 11.6-7 AFR. When I reached the end of the 1/4 my timing was pulled from 15* down to 7-8*. Is it safe to add timing when the IATs are that high while running meth? I'm getting over 13psi of boost with a F1A 403 with no knock. How much power am I possibly losing with the timing pulled so much. Also, I want to install a 10gph nozzle (?) pre Procharger to help with the IAT's. Is this safe? I have a Alcohol Injection System trunk mount kit.
TECH Fanatic
Joined: Mar 2011
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From: Statesville, NC
Martin from Tick said he will be running a pre compressor meth nozzle on turbo so wouldn't see why it would be a problem for you either with procharger. I also have the trunk mount AIS kit with twin 10 pound nozzles. Not progressive. I see almost a full point drop in afr when it comes on at 7psi. Matter fact I smashed it on the way to work this morning and 11.0 afr till 7psi then meth come on (100% meth) and it went to 10.0 on the wideband. I have not tuned with this so my timing is still only 14.5*. I justed added the meth for the safety. My iats stay super low lol. Also have the CX Racing intercooler. The 4" thick one.
Im on 16 or so psi on a stock longblock for exception of cam ls1. Here is pictured where my nozzles are located. On the passenger side of engine bay on the boost pipe. They are positioned to spray almost toward each other. That way the total area of the airflow is consumed by the spray. You can see where my iat sensor is in the picture also.
Im on 16 or so psi on a stock longblock for exception of cam ls1. Here is pictured where my nozzles are located. On the passenger side of engine bay on the boost pipe. They are positioned to spray almost toward each other. That way the total area of the airflow is consumed by the spray. You can see where my iat sensor is in the picture also.
We have the same IC and my IATs be in the 120s while cruising. I'm using a 50/50 mix so to get my desired .5 or so drop in AFR I'm going to get the 10gph nozzle you have. I don't want to be fully dependent on the meth but I would like to be able to dial in 18* of time at WOT without worry. I have it setup to pull a lot of timing until I can sort it out and find out what would be safe with 180 intake temps.
PS. Where did you get your weld-in bungs for your nozzles?
PS. Where did you get your weld-in bungs for your nozzles?
TECH Fanatic
Joined: Mar 2011
Posts: 1,916
Likes: 8
From: Statesville, NC
We have the same IC and my IATs be in the 120s while cruising. I'm using a 50/50 mix so to get my desired .5 or so drop in AFR I'm going to get the 10gph nozzle you have. I don't want to be fully dependent on the meth but I would like to be able to dial in 18* of time at WOT without worry. I have it setup to pull a lot of timing until I can sort it out and find out what would be safe with 180 intake temps.
PS. Where did you get your weld-in bungs for your nozzles?
PS. Where did you get your weld-in bungs for your nozzles?
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TECH Fanatic
Joined: Mar 2011
Posts: 1,916
Likes: 8
From: Statesville, NC
We tested on a hot day when I first tuned it and iats dropped 40* with it compared to without. But my bov was in a bad location and it sprayed it out everywhere when letting off from wot so I had it tuned without till I later relocated things. Then I added it back myself. Just monitored afrs. I know its way rich but may help it live a long time lol.
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Verdad Gallardo TECH Fanatic
Joined: Mar 2011
Posts: 1,916
Likes: 8
From: Statesville, NC
Straight out the box. It pumps pretty good pressure because I held my finger over the end of it when I primmed to see. Obviously not the tip end but the open end that goes to the tips
I'm spraying the same amount at the same ratio and it basically prevents my IAT's from climbing above ambient. Haven't done a 1/4 pass yet, but after a highway pull of ~5 seconds the IAT doens't change from where they started. The IAT sensor is a couple feet from the nozzles inside the intake, so I don't think the droplets are hitting it directly to cause huge drops in IAT like some people report. Without the meth injection the IAT's would go up ~10F.