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  #1  
Old 02-25-2004, 02:22 PM
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Nitrous Questions

I'm not planning on going on the bottle, but I have been wondering a few things about the whole nitrous idea.

With an auto transmission, does it put any extra stress on the shifting process? I would think that it puts alot of stress on it, but I'm not sure.

With a 5spd, do you hit the button and shift or do you leave it in gear and hit the button?
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  #2  
Old 02-25-2004, 06:23 PM
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Any additional HP. will do better at breaking the tranny. Most of the N2O set ups work off a WOT (wide open throttle) switch, so it only applize the nitrous when the accerators all the way down.
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  #3  
Old 02-25-2004, 07:02 PM
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Re: Nitrous Questions

Quote:
Originally posted by petesvx2
I'm not planning on going on the bottle, but I have been wondering a few things about the whole nitrous idea.

With an auto transmission, does it put any extra stress on the shifting process? I would think that it puts alot of stress on it, but I'm not sure.

With a 5spd, do you hit the button and shift or do you leave it in gear and hit the button?
I wonder about the AT too. It seems to me that you just leave the nitrous engaged while the tranny shifts. If so, it will put stress on the gear clutch and shift band. It shouldn't be too stressful though because the SVX ecu retards the engine timing by a large amount between shifts to make the shifts more smooth and reduce stress on the tranny. Retarding the timing will reduce the HP produced by the nitrous.

With a 5-speed, the nitrous is disengaged between shifts. It can be controlled by a button on the shifter, or it can be set to activate at a particular throttle position.
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Old 02-26-2004, 06:59 AM
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Thumbs up

Thanks!
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  #5  
Old 02-27-2004, 12:56 AM
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this is why you shoudl get a zex kit
the zex kit will not spray between shifts i believe
lots of the impreza guys run zex with the auto and have no problem


be ware the 5mt and any power, the gears themselves are weak, they will break if you overpower them, the 4eat gears are at least twice as strong as the 5mt (excluding forester 5mt and MY04 5mt's)
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Old 02-27-2004, 08:11 AM
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I'm pretty sure that unless the driver flips a switch, even the ZEX kit flows nitrous during shifts on a 4EAT. I don't see how it could be otherwise because nitrous kits do not interface with the ecu or the tcu to know when a shift is occuring. The 5MT is definitely not a strong transmission, but I think it can handle a good nitrous shot if applied properly. There are lots of people pushing 300+ HP through bone stock 5MTs. The key is to avoid shock loading the transmission. This is when the gears start breaking.
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  #7  
Old 02-28-2004, 03:12 PM
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People can get around 260 WHP before the 5spd starts to become a problem.
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  #8  
Old 02-28-2004, 05:41 PM
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Quote:
Originally posted by NomadTW
be ware the 5mt and any power, the gears themselves are weak, they will break if you overpower them, the 4eat gears are at least twice as strong as the 5mt (excluding forester 5mt and MY04 5mt's)
The gears themselves aren't that weak... They can handle cars running upto 300whp... that's alot!!! It isn't the amount of power, it's how you apply the power... The 02MY WRX wagon that's in in my locker had over 300whp and the tranny lasted till the car was 44k miles old... Then Aaron(the owner) decided that he was gonna show off for some girls and tried to do a AWD dounut in the parkinglot of Wal*Mart... Bang!!! There went 1st gear... And the only thing diffrent between the MY02 tranny's and the MY04 is that 1st gear synchro's have been updated and are stronger, Subaru started doing this with the MY03 tranny's... So that means that the MY03 and the MY04 tranny's are the same, and other than that they are the SAME tranny... They are good trannys over all, just don't abuse them or they will break...
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  #9  
Old 02-29-2004, 01:46 AM
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the forester at least, and i was under the impression that the 04 wrx's as well, use a different 5mt it is the 5mt that in the past was on the sti in japan before the 6mt came out, it's much heavier duty and has been proven so, apparently it's good to about 500hp, some in japan, who drive like grannys with it if that's possible have nearly 1000hp going through them
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