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Old 18-11-2005   #1
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Cool Nitrous

Has anyone fitted nitrous to a 1242 spi?

I've seen a kit in local paper which has been taken of a corsa, 175. Including the purge kit.

Opinions??
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Old 18-11-2005   #2
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Re: Nitrous

Quote Originally Posted by Slippy
Has anyone fitted nitrous to a 1242 spi?

I've seen a kit in local paper which has been taken of a corsa, 175. Including the purge kit.

Opinions??
What size jets? You want to start low and build the power up.
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Old 18-11-2005   #3
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Re: Nitrous

25bhp - if i wanted more... how much are the jets??
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Old 18-11-2005   #4
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Re: Nitrous

Stick with 25 imo Rob from GSR is running that on his fine and I will be once I get it all set up
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Old 18-11-2005   #5
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Re: Nitrous

Jets are cheap IIRC - 10 quid ish in 25 bhp steps. IMO 50-75 bhp is the maximum on a road car, and you'd need a progressive controller to introduce the extra power steadily. You can get up to 300bhp jets

The supplier of any larger jets would probably want to ensure that the current setup is working fine before adding extra power to the system, to make sure that the engine, transmission etc. can handle it.

HTH
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Old 18-11-2005   #6
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Re: Nitrous

I wouldn't go over 25bhp.
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Old 18-11-2005   #7
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Re: Nitrous

Quote Originally Posted by Oldschool
I wouldn't go over 25bhp.
Why?
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Old 18-11-2005   #8
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Re: Nitrous

the torque factor and the gearbox...
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Old 18-11-2005   #9
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Re: Nitrous

gearbox can take it i think (150bhp cinqs on std gearbox over in euro land)

its just the extra stress on all internals on engine i think that really limits the amount you can put in
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Old 18-11-2005   #10
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Re: Nitrous

I would tend to agree with Ghgost on this one. The clutch would give up before anything else on the transmission side first.

I may go and have a look at it - for that price i don't think i can go wrong.
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Old 18-11-2005   #11
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Re: Nitrous

Quote Originally Posted by JamesMK2
the torque factor and the gearbox...
Plus theres the fact that the 'boost pressure' that N2O creates will mean the combustion chambers are higher (max temp and temp at top of compression cycle), so theres always the possibility that you could start melting parts like pistons or valves!

Not big or clever....unless its a race car or custom built for that kind of power
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Old 18-11-2005   #12
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Re: Nitrous

If you read about nitrous on turbo cars - the temperature of the noz actually benefits the engine by cooling the chambers prior to combustion. It has a positive effect on the engine with respect temperature. With respect to stress, I agree, it is effectively with a 50bhp jet doubling the stress on every component of the engine.

Engines are cheap enough though.. really,, aren't they??
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Old 19-11-2005   #13
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Re: Nitrous

Quote Originally Posted by Slippy
If you read about nitrous on turbo cars - the temperature of the noz actually benefits the engine by cooling the chambers prior to combustion. It has a positive effect on the engine with respect temperature.
...I was talking purely thermodynamically in terms of the effect of the pressure increase on the engine cycle...but the hot-cold cycle could lead to cracking if its too fast! (possibly anyway)....But turbo cars run higher than normal pressures anyway so usually use a reduced Compression Ratio to reduce the cycle temperatures!

And really high boost systems use water injection to cool cylinders too. But if using a turbo, why use N2O when you could just up the boost?
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Old 19-11-2005   #14
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Re: Nitrous

because in a turbo a 25 shot of the gas would give alot more than 25bhp, as it would take the temp of the charge down by 15-20 deg, so alot more air in + more fuel in much bigger bang
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Old 19-11-2005   #15
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Re: Nitrous

what the nitros does is increase the detonation in the combustion chamber.the compression goes out of the roof and melts/holes pistons for breakfast.unless the engine as been rebuilt to withstand this,forget about it.it will lead to rapid engine wear.
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