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1st gear Nitrous shot for 9:1 C/R Supercharged?

 
Old 03-05-2002, 06:35 PM
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Default 1st gear Nitrous shot for 9:1 C/R Supercharged?

What is the lowest RPM you could safely kick a 50 Shot of Nitrous off at with a lower compression engine, say 9:1 ??

I'd like to get a boost in 1st gear until the SC kicks in good with the Cam at around 4000rpm.

Say... 2700->4700 RPM window?
This way it'd only kick in 1st gear, eh?
You'd stay above 4700 if you shift at 6.5k, right?

Would a 75 shot be safe w/9:1 ?
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Old 03-05-2002, 07:37 PM
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Default Re: 1st gear Nitrous shot for 9:1 C/R Supercharged?

if your blower is set up right....you dont need all that. especially if you had an auto. with your M6 i still dont think it'd be necessary, but for information's sake...id say 2500.
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Old 03-05-2002, 07:49 PM
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Default Re: 1st gear Nitrous shot for 9:1 C/R Supercharged?

Ya, talking 6 spd.

Do you normally see much boost between 2-4k?
Like a Cam, I'd figure you'd be weakest in 1st gear 'til you get past the low and mid-rpms.

What boost do you see with an 8# setup ATI at 2k, 3k?

TIA

[ March 05, 2002: Message edited by: MelloYellow ]</p>
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Old 03-05-2002, 08:29 PM
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Default Re: 1st gear Nitrous shot for 9:1 C/R Supercharged?

This is first gear with boost --> <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" /> <img src="gr_grin.gif" border="0">

I don't think you need to worry about first gear. Its impossible to go WOT in first with only 4psi. I'm thinking you would need some major tires for 8psi.

If you want more punch, put in a torque converter(auto. only obviously <img src="gr_images/icons/wink.gif" border="0"> ) It'll be safer on the motor and give you that extra "50 shot" thrust. <img src="gr_grin.gif" border="0">

If you've got a six speed just raise the rpms, drop the clutch and pray that it holds. <img src="graemlins/fluffy.gif" border="0" alt="[Fluffy]" />

Oops, just saw your talking about a 6spd. so just disregard the auto part. <img src="gr_stretch.gif" border="0">

I don't know much about N2O but, I thought you weren't supposed to spray below 3000.(something about the motor not accelerating fast enough) <img src="images/icons/confused.gif" border="0">

I really can't give you to good an answer about the boost at different rpms because of the small guage and low boost I run. I would think stopping the nitrous in the low 4000's would be good because you will really start building boost quickly at that point. Thats when I can really start to feel the boost coming in.

Awww...What the hell, spray it all the way to redline. <img src="gr_eek2.gif" border="0">

Johnnie
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Old 03-06-2002, 10:20 PM
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Default Re: 1st gear Nitrous shot for 9:1 C/R Supercharged?

Ya, 6spd. Normally it's safest at 3000+ but I think that recc is for 10.1:1 C/R. So maybe 2500-4500 or so would be ok.

Tires are 18x335 PZero's. I don't like dropping the clutch above 2k rpm.

Just thinkin'.
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Old 03-07-2002, 07:29 AM
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Default Re: 1st gear Nitrous shot for 9:1 C/R Supercharged?

Why not get a set of ET Streets?
Then you can dump the clutch at pretty much any RPM you'd like...
P Zero's certainly AREN'T going to hold that kinda of power.
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Old 03-07-2002, 08:34 AM
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Default Re: 1st gear Nitrous shot for 9:1 C/R Supercharged?

really, with the vette, i wouldnt worry much about preaking drivetrain parts unless you are really dumping the clutch at 5000+. i would say the shock of N2O at 2500 plus the added stress of the blower will be harder than the natural ramping tq of just the supercharger. take just Me for example. STOCK 98 A4 trans and 10-bolt rear, 2800 stall and he used to have a 175hp dry shot and now he has about 550rw with his vortech. no breakage. he has 2.73's in the rear and has always used a progressive controller as far as i know. things break with shock, until you get to that 600+hp level. wheel-hop, dry burnouts, initial hits of nitrous, a turbo going from 0psi to 8 or 10 in .8 second....that breaks stuff. superchargers are nice. id say with a 9:1 motor and a pulley'd up ATI you could see 10-12 peak and prolly see as much as 4 or 5lbs way down at 2500-3000.
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Old 03-07-2002, 08:22 PM
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Default Re: 1st gear Nitrous shot for 9:1 C/R Supercharged?

Underdog:
That's cool. Glad to know there'll be some boost down low at 2500-3000.
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