nitrous in a 944 N/A
12-25-2006, 12:09 AM
#2
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I couldn't see it doing much, properly done, maybe a 25-35 shot wouldn't hurt the motor. It's only temporary anyway, that bottle runs out quick. I'd recommend a wet shot, a bit safer than dry.
12-25-2006, 12:13 AM
#3
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http://cgi.ebay.com/ebaymotors/unive...spagenameZWDVW
im thinking about this one what do you think
and how much horsepower do you think ill get
also does nitrous run constantly or only when you turn it on
thanks
chris
im thinking about this one what do you think
and how much horsepower do you think ill get
also does nitrous run constantly or only when you turn it on
thanks
chris
12-25-2006, 12:34 AM
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Fishey would have better suggestions for application but...
The kit is not what sets the shot, the jets used, they will be different per type of car and fuel pressure. Nitrous is normally wired as such..
A relay activated by a toggle switch to turn the system on and a WOT switch to trigger the flow. Sometimes on top of that there wil be a button to activate it so..with the system on and at WOT you have a choice to boost or not. There's a few good books out on the subject. They'll have all the good stuff and tips like the nozzle being outside the TB and such.
The kit is not what sets the shot, the jets used, they will be different per type of car and fuel pressure. Nitrous is normally wired as such..
A relay activated by a toggle switch to turn the system on and a WOT switch to trigger the flow. Sometimes on top of that there wil be a button to activate it so..with the system on and at WOT you have a choice to boost or not. There's a few good books out on the subject. They'll have all the good stuff and tips like the nozzle being outside the TB and such.
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12-25-2006, 07:12 AM
#8
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I had a Zex 55,75,125 jet system. The one that had the computer read from the TPS to FRP hook up! You pluged the NO2 into the cone filter. Yea, I never ran it. Infact, I drained the tank and mailed it to a buddie with a Z-350. I could not do that to my 83' 944.
I doubt the AFM will really undertand what is going on. The cold NO2 blowing in the AFM would probably confuse the computer. And to put the NO2 in past the AFM is "False Air" and if you going to do that you should step up the FPR to a 3.0BAR and possibably step up to 55Lbs injectors. Otherwise the motor could experince detonation probblems. Well that is my thought.
I doubt the AFM will really undertand what is going on. The cold NO2 blowing in the AFM would probably confuse the computer. And to put the NO2 in past the AFM is "False Air" and if you going to do that you should step up the FPR to a 3.0BAR and possibably step up to 55Lbs injectors. Otherwise the motor could experince detonation probblems. Well that is my thought.
12-25-2006, 08:47 AM
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NO2 downstream of the AFM is fine with a wet setup - a "wet" system injects fuel in proportion to the amount of NO2 going in, so the WOT fuel ratio remains constant (in theory, anyway).
A 50-shot would probably be fine on these engines with decent reliability, and represents a pretty darned big gain over stock, percentage wise.
Anything more than that, I'd start worrying about the transmission on a stock N/A, particularly if it's being used for launches (and personally, I wouldn't - I'd use it for acceleration hooked up to come on at above, say 2,000 RPM and WOT in gears 2 or higher). Something like that.
It's a tool. Like any other, if used properly it can be a great help.
A 50-shot would probably be fine on these engines with decent reliability, and represents a pretty darned big gain over stock, percentage wise.
Anything more than that, I'd start worrying about the transmission on a stock N/A, particularly if it's being used for launches (and personally, I wouldn't - I'd use it for acceleration hooked up to come on at above, say 2,000 RPM and WOT in gears 2 or higher). Something like that.
It's a tool. Like any other, if used properly it can be a great help.
12-25-2006, 08:51 AM
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One other thing to think about, drag race type "launches" are very hard on transmissions and cv joints. Adding more power to the mix is just a guarantee that you'll break something in the drivetrain. If the nitrous is used once the car is rolling, that should be a different story. Let Fishey chime in with more personal experience.
12-25-2006, 09:33 AM
#11
Nordschleife Master
120whp before on an 8V 1987 924S motor and 195whp/230wtq after... I lost all my dyno sheets from both my 944 and 924S somewere early last year and have been hunting to find them since. If I find them I will be more then glad to post the graph. (that was on a 75shot) I mostly ran a 55shot. However, I have no doubts that atleast on the early lower CR motors a 100shot can be done without issue.
You tell me for $500 is having as much HP as a 951 stock worth it? Sure its temporary but sometimes is better then never. Also, a bottle last @55shot about 16 good runs and about 8@100shot.
Also, on a side note I ran a wet shot and I belive thats the best way to go but expecially with the S2 anything over 100 is very risky as the fuel/nitrous mixture to each cylinder just isn't well divided in a stock S2 manifold. I never did much flowbench testing on the 8v manifold mostly because I don't care. However, with the wet nitrous setup the one I used atleast (Zex) my A/f reading were spot on useing there pre-formula "shot setting". I also ran 2 stage colder plugs in both cars to prevent pre-detonation. If you do run nitrous run copper plugs and stay clear of platinum or iridium.
P.S.
I no longer have the nitrous on the 924S and actually only installed it for a few weeks untill I throught I blew a headgasket (did oilcooler seals 2x) and was still getting mixture altho compression was fine. So I tore down the motor and in the 2 weeks I had it on the car I ran 2 bottles through it @75 shot rating. When I got the motor open everything was fine! Damn, it was the oilcooler seals (I re-did them a 3time and I guess third time is the charm) but tearing the motor apart wasn't wasted. I did find a valvespring broken that I didn't know had broke obviously not a result of the nitrous but my continous need to redline the motor. After I put the motor back togeather I sold that nitrous setup to a friend who put it on his nissan 350Z.
You tell me for $500 is having as much HP as a 951 stock worth it? Sure its temporary but sometimes is better then never. Also, a bottle last @55shot about 16 good runs and about 8@100shot.
Also, on a side note I ran a wet shot and I belive thats the best way to go but expecially with the S2 anything over 100 is very risky as the fuel/nitrous mixture to each cylinder just isn't well divided in a stock S2 manifold. I never did much flowbench testing on the 8v manifold mostly because I don't care. However, with the wet nitrous setup the one I used atleast (Zex) my A/f reading were spot on useing there pre-formula "shot setting". I also ran 2 stage colder plugs in both cars to prevent pre-detonation. If you do run nitrous run copper plugs and stay clear of platinum or iridium.
P.S.
I no longer have the nitrous on the 924S and actually only installed it for a few weeks untill I throught I blew a headgasket (did oilcooler seals 2x) and was still getting mixture altho compression was fine. So I tore down the motor and in the 2 weeks I had it on the car I ran 2 bottles through it @75 shot rating. When I got the motor open everything was fine! Damn, it was the oilcooler seals (I re-did them a 3time and I guess third time is the charm) but tearing the motor apart wasn't wasted. I did find a valvespring broken that I didn't know had broke obviously not a result of the nitrous but my continous need to redline the motor. After I put the motor back togeather I sold that nitrous setup to a friend who put it on his nissan 350Z.
12-25-2006, 11:24 AM
#13
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Also visit my site: mavfan72.tripod.com I did the dry Zex kit, and with a 75 shot i got 168hp and 200tq. not too bad, but by the looks of it fishey's wet kit did 30 more hp and tq. Also whether it was the nitrous or not i've had to replace my transmission... but i have not yet had to replace the bottle because i use it so rarely. anyways check out my site, it should answer some of your questions.
12-25-2006, 05:49 PM
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I'm with Fishey, the 944 N/A engine's are pretty solid an should be able to take 75-100 shot of properly set up nitrous without any timing advance. I've got a built 355 Camaro that I run 125 shot on with minimal timing advance and the engine has had no problems and since it is set up properly never will (at least not from fault of the nitrous) I say if you're gonna do it go for it. It's cheap temporary horsepower. Because really when do you honestly use all of your power? I know in my 951 only reaches fully boost maybe once a week. Good luck vwvortex123...