Dry and MAF
Thread Starter
TECH Junkie
Joined: Dec 2012
Posts: 3,614
Likes: 1,326
From: Iowa
Dry and MAF So I read alot about dry nitrous and MAF's and can't seem to find the info I need anywhere. Maybe I just suck at the search function so if I've missed a thread, feel free to link it in here.
Otherwise, I'm wondering if you can see a difference in MAF frequency based on jet size. For example, N/A at WOT my stock LS1 sees around 9500-9800 Hz.
With a dry shot pre maf, lets say a 75 shot, will I see around 11,000
Then with a 125 I'll see 12,500
so on and so forth.
Or will the cold nitrous just damn near max the maf no matter what jet size?
Otherwise, I'm wondering if you can see a difference in MAF frequency based on jet size. For example, N/A at WOT my stock LS1 sees around 9500-9800 Hz.
With a dry shot pre maf, lets say a 75 shot, will I see around 11,000
Then with a 125 I'll see 12,500
so on and so forth.
Or will the cold nitrous just damn near max the maf no matter what jet size?
I was intrigued by your question so tried looking myself. Holly crap is there a lot of not very good info to be found. I seen nothing that seemed concrete and repeatable other than spraying close to it and maxing it out so you could tune to the same conditions all the time. Best thing I saw recommended was the hsw interface which is just a tricker so that's something you might want to look into.
Thread Starter
TECH Junkie
Joined: Dec 2012
Posts: 3,614
Likes: 1,326
From: Iowa
I've been finding the same...lots of incomplete, shoddy, or just plain wrong info. I also have seen the HSW interface but they are long out of business correct? And I'd rather not trick the ecu any more than absolutely needed. If it comes down to just maxing the MAF and tuning accordingly that's fine, but it would be nice to have the data before I go shooting blind.
Yes HSW is long gone. But how it works with the maf isn't like how it and other iat trickers trick the iat. It simply just adds to the signal so it's still reading but with the added Hz you have in series. It would take some test n tune to get the right hz dialed in for added hp but I don't think it would be much harder than dialing in any other wet kit.
I did a 200 dry shot like this. You are partially correct. Peak power, yes you will be at a higher maf frequency. But you may/will end up with some overlap where some frequency cells are hit for both NA as well as with the shot.
Thread Starter
TECH Junkie
Joined: Dec 2012
Posts: 3,614
Likes: 1,326
From: Iowa
So I'm clear with my intentions for asking this question. I'm wanting to have 2 dry kits on my LS1. I'm curious if there will be a clear difference in MAF frequency when I add the 2nd kit so that I can tune for it easily.
You'll more than likely hit higher cells, but like I said you're going to have overlap so you'd have to tune those cells for the 2nd kit and run richer on the 1st kit.
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Thread Starter
TECH Junkie
Joined: Dec 2012
Posts: 3,614
Likes: 1,326
From: Iowa
Can you explain the overlap you are talking about a little better? From my NA logs, when I go WOT, i'm usually between 8500 and 9500 Hz and i NEVER hit those cells unless i'm at WOT. typically i'm at 8500 hz around 3200 rpm and 9500hz around 6200 rpm
Are you saying that if I were to spray a Dry shot, I might hit 9200Hz at 3200 rpm and then hit 10,500 at 6200 RPM. so that 9200-9500 area would be where I overlap nitrous with NA?
Am I understanding that correctly?
Are you saying that if I were to spray a Dry shot, I might hit 9200Hz at 3200 rpm and then hit 10,500 at 6200 RPM. so that 9200-9500 area would be where I overlap nitrous with NA?
Am I understanding that correctly?
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Verdad Gallardo I think you got it. When you go WOT, there are a range of cells as you rev through the RPM range. When you add the nitrous, you may still have some cells that you also hit when you are NA. You'll need to tune for worst cause, which means you'll run rich at those cells when NA.