Nozzle Placement - Custom CAI
Nozzle Placement - Custom CAI 88 GTA w/ LS1 transplant. The CAI is 4" K&N cone filter into a section of 4" SS tube, hump hose joint to MAF then a 90 degree hose into throttle body. MAF is descreened, not ported. Planning on dry kit, not sure which one yet.
Any suggestions on nozzle type and placement?
Any suggestions on nozzle type and placement?
What type of MAF? If it's the one that Corvettes use, I think anywhere a couple of inches before the MAF should be fine. If the f-body version, I'd place it before the IAT sensor. In both cases, I think it's best to spray away from the MAF, but that's only something I read in this forum, meaning I have no personal experience.
Last edited by gi8e7oi825; Jun 21, 2007 at 02:28 AM.
Unfortunately it would be in the rubber boot area. Going to be tough to adjust. I would suggest about 3" away pointing at the MAF, and then adjust by turning the nozzles away from the MAF. Also, ask the king of dry and see what he thinks.
(robert56)
(robert56)
I agree with Todd, and furthermore, I would use dual nozzles for more tuning a/f options. You want to start with both nozzles pointing directly at the MAF wire, then you'll get your richest a/f, then if it's a little to fat you can start to rotate one nozzle so as it sprays some or all over the the maf wire. If this isn't enough, then point one of your 90* nozzles directly back into the airstream. You can even go further than this to lean it out, put a smaller jet in the one pointing at the wire and a larger jet in the nozzle going back into the airstream, allthough, I really don't think you will need to go this far.
Robert
Robert
Thanks for the input. I assumed it would end up being in the hump hose which won't be a lot of fun but I'll figure it out. Like the thought of dual nozzles, hadn't considered that.
Another thing I haven't quite figured out; How does the MAF regulate A/F at WOT? I thought at WOT the MAF calculations were ignored and A/F was dependent on PE and VE tables. I see it's working ok for everyone just want to understand how/why. I have HPTuners so I'll be able to start small and log the runs to see what's going on.
Another thing I haven't quite figured out; How does the MAF regulate A/F at WOT? I thought at WOT the MAF calculations were ignored and A/F was dependent on PE and VE tables. I see it's working ok for everyone just want to understand how/why. I have HPTuners so I'll be able to start small and log the runs to see what's going on.
Originally Posted by crewchef
Thanks for the input. I assumed it would end up being in the hump hose which won't be a lot of fun but I'll figure it out. Like the thought of dual nozzles, hadn't considered that.
Another thing I haven't quite figured out; How does the MAF regulate A/F at WOT? I thought at WOT the MAF calculations were ignored and A/F was dependent on PE and VE tables. I see it's working ok for everyone just want to understand how/why. I have HPTuners so I'll be able to start small and log the runs to see what's going on.
Another thing I haven't quite figured out; How does the MAF regulate A/F at WOT? I thought at WOT the MAF calculations were ignored and A/F was dependent on PE and VE tables. I see it's working ok for everyone just want to understand how/why. I have HPTuners so I'll be able to start small and log the runs to see what's going on.
Actually I believe above 4000 RPM (Stock Tune) it pretty much goes by the MAF.
I have EFI Live and the tables are not idenified the same in HPT (WHICH REALLY SUCKS for end users like us with different tuning packages)...
Look at the HPT equivelent of RPM Threshold for Airflow Calculation
If engine speed is above this value, then the PCM will use the MAF sensor exclusively (if not disabled by DTCs) to calculate grams of air per cylinder.
Stock has it at 4000 RPM
Thanks Beer, I sometimes get things backward like that. After I thought back on it and looked at how I was tuning you're absolutely right. I tune the VE tables by driving around under 4K and staying out of PE mode w/ MAF disabled. Don't worry about anything over 4K becaue it's all MAF from there on. I would do ok on this stuff if I could get out of my own way 
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Originally Posted by 1999ssls1
If you dont mind me asking, how much spray if you go dry shot?
My Stock 26's I was limited to a 50 shot. I intend to go 150 with my 42's (and should be able to go higher).
Originally Posted by 1999ssls1
If you dont mind me asking, how much spray if you go dry shot?
Originally Posted by crewchef
Thanks Beer, I sometimes get things backward like that. After I thought back on it and looked at how I was tuning you're absolutely right. I tune the VE tables by driving around under 4K and staying out of PE mode w/ MAF disabled. Don't worry about anything over 4K becaue it's all MAF from there on. I would do ok on this stuff if I could get out of my own way
Robert
Originally Posted by 1999ssls1
I was asking because of injector size. I dont believe I know you. If you will read my post I have been trying to figure out why I am wondering about the dry shot.
Robert