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Discussion Starter · #1 ·
Hey guys,

I was running nitrous on my ride keeping an eye on a/f with a PLX M-300 but I took off the juice and sold it. My concern was excalating EGT's and no means to monitor them. What kind of EGT's are people getting while spraying?
For reference my mods were stage 1, AGP WGA, re-routed vac. lines w/ MBC, AEM intake, 3" catless DP, 3" o2 housing, elec. cutout (open when spraying), NGK plugs at .038, 19#'s boost. I kept the a/f in the high 10 to low 11 range while spraying.

How bout them EGT's
 

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I would believe egt's wouldn't be a concern when spraying and considering your mods.
 

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robino said:
yeah, i'm concerned...

but if you're having good a/f ratios while spraying...why would your EGT's be out of wack?
while spraying nitrous, it is possible to have higher EGTs but keep the a/f similar.

I have a friend with a Maxima that has a 75 shot. When he sprays, his a/f ratio is actually lower than when he doesn't spray, but his EGTs are about 150 degrees hotter. When tuning a car, you have to look at a lot more than just a/f.
 

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Discussion Starter · #9 ·
1850 is EXTREMELY hot! That's my point. Just cause your a/f is safe, or even mega-rich, does not mean that your EGT's arent sky high.
Think of it this way, nitrous is an injection of nitrogen and oxygen, more oxygen in the cylinder means more fuel to burn right? Burning more fuel creates more power, right? Heat is a by-product of energy, energy = power. So with more power you create more heat. More heat = higher EGT's. Higher EGT's on an already elevated charge temperature due to boost = melted pistons.
Another point. Hypereutectic pistons will no withstand lots of mishaps. Mishaps happen when you cannot monitor/tune what your car is doing. Have you seen the ringlands on our pistons, laughable. Not much there, heat up the dome of that piston enough, slap on some detonation and you have a grenade in your cylinder.
This is my concern. I'm not a know-it-all but I am more knowledgable than your common ricer.
 

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robino said:
ok ok...
so what does one do to prevent these higher EGT temps?
how do you tune for lower temps while still spraying?
go up a couple thousands on the fuel jet until you get the number you are looking for...

As a side note, the oxygen in the nitrous is an accelerant, not a fuel
 

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the reason why any car needs to run rich is to use the extra unburnt fuel as a coolant. now if you have water injection the water is 6 times better at cooling than gas is. so if you add that into the equation your egt's should go down.

also running water injection allows for a few more degress of timing because the cooling effect lessens detonation. more timing will lessen egt's.

kenny an egt gauge and h2o injection is definatley in store for me...hopefully when that is setup i can add a map clamp which will give me more timing/power and lessen my egt's. but i am going to get the gauge first and then post up the before and after effects of water/meth injection. then i will add a clamp and again post the before and after effects of both egt and a/f ratio.

as for now not too much sprayin for me.
 

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on a side note i think once we get some hard evidence as to what is happening inside we should post it as a sticky for n2o users to keep in mind. The motor can handle 500hp, but can your tune???
 

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yes....s2 kicks you out of race gas mode once it senses knock....the water injection will reduces knock far better than extra(rich) gas ever could...

there are a few great companies out there that offer a good water/methanol kit:
snowperformance.net
coolingmist.com
 

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Discussion Starter · #20 ·
SRT4B said:
not really, the charge temps drop by 25% when spraying.

when backed w/ evidence I will give that claim credibility. Until then, I'll take it with a grain of salt. No offense, but where is your credibility?

As far as water injection and nitrous goes Dennis, I think you'll get better results in another thread you hi-jacker! I'm gonna kick your ass! J/k, see you around soon. Cruising the Coast was owned by T.S. Matthew.
 
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