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Old 06-01-2007, 02:47 AM   #1
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Default nitrous ?

so i got build motor 8.5:1 compresion pistons and fm iv turbo with link pigy
i bought 75hp shot nitrous .
can i ran the nitrous stright up, or i need some kind of timing retard ?
can i plug it through the Link pigy ?
if not what options do i have ?

Thanks
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Old 06-01-2007, 09:35 AM   #2
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with the turbo, do you really need the nitrous?
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Old 06-01-2007, 09:36 AM   #3
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I would think water injection would be cheaper/better value.
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Old 06-01-2007, 09:37 AM   #4
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you can run it... but I wouldn't unless you know how to tune it. nitrous changes the mixture so rapidly that tuning is very difficult. It will want to go extremely lean extremely quick.
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Old 06-01-2007, 10:08 AM   #5
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Yes, it's just like running nitrous on anything else. You use it to spool the turbo then have a PSI switch that shuts it off once the turbo spools, let's you use the nitrous for a longer time. As long as the nitrous and fuel are being sprayed in the correct proportions there should be no problem. You will want to be just a hair on the rich side to compensate for boost pressure reducing fuel flow.

I would probably run a 35 shot and pull about 2 degrees of timing from the map areas where you plan to run the nitrous. I would probably ditch the link piggy at this point too.

Mark
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Old 06-01-2007, 11:26 AM   #6
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Quote:
Originally Posted by Markp View Post
. I would probably ditch the link piggy at this point too.

Mark
you saying i should look for another ecu or just not plug it together ?

and yes, i was thinking about it for fast turbo spools.
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Old 06-01-2007, 11:56 AM   #7
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There's no reason to shut it off when the turbo is spooled, spray to redline if your engine can take it. You need to retard timing though. You don't want to be spraying at really low RPMs, and only at WOT. You need a window switch (like 3500rpm-Redline) with WOT switch. If you shift without lifting then you need a switch on the clutch too because you definitely don't want to spray at WOT with no load. I'd say a 75 shot is a bit too high to start out with. But once you have the kit, nozzles aren't too expensive. Start with 35 and go from there.

Hopefully you got a wet kit.
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Old 06-01-2007, 12:29 PM   #8
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screw that I wouldn't even use nitrous in a turbo car. The turbo is enough for me, if I was going to do anything along those lines, I'd get water injection. Maybe because I'm afraid of nitrous because I know nothing about how to tune or anything with that stuff. I'd just be afraid to blow something.


sure you could use it though.
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Old 06-01-2007, 12:42 PM   #9
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A lot of people use them on turbo cars, especially in drag racing. Some people get exceptional results out of nitrous and others can never get the car to pull right on it. Nothing wrong with it, but not for everyone. If you have a built motor and want to play I say go for it, starting conservatively and always with a wet kit. Since the Miata isn't a drag car, and the stock motors- which most of us have- won't like nitrous, I don't think we'll see much talk of it here.
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Old 06-01-2007, 01:32 PM   #10
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for what reason would the stock motors not like nitrous. with proper fueling and timing control, we have our stock motors pumping out almost 2.5 times the factory hp at above 20psi.

there's no reason that a wet nitrous kit with cautionary timing control would be more likey to blow your motor than all the turbos people slap on their stock internals
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Old 06-01-2007, 01:45 PM   #11
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You're probably right. But nitrous is much less forgiving than boost as far as tuning is concerned. You could slap on a wet kit on a stock engine, even a 100hp shot and you'd probably be ok with timing control and a good fuel pump. But when you're already making 200hp on boost alone I'd be more careful- it's not a power issue, it's a tuning issue. With 9:1 compression and boost, pushing 200hp, your tuning window (basically your fudge factor) is already small.

You're preaching to choir in my case, when it comes to beating the everloving **** out of stock junk. My Talon had a 7.8:1 compression ratio and I could clamp my wastegate shut on a 600cfm turbo and pour in some C16 and that was "tuning." People in the Miata world seem to be more cautious. And that's maybe not a bad thing.
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Old 06-01-2007, 02:18 PM   #12
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what do you suggest for timing control ?
as the link is unable to do that
or as Mark mentioned just pull 2 degrees from the map area where the nitrous will be used
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