Nitrous spark plug selection question
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Joined: Jul 2001
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
3.5 to 4 /10's is a lot of e.t. to gain in a mid 10 second car. I have never used the -8's and have had great luck with the -9's.
Your next motor will need -9's or even -10's
I think your plan will gain an appreciable amount of MPH, but not much et. I agree with Daren that you need to put the power to the car as quick as possible to get a 9 sec slip. NA converters are not efficient nitrous converters, granted we are only talking about a 100 shot, but the rule still applies.
Not totally an apples to apples comparison; but when I first ran nitrous in my current car the car would go 9.40's on the motor at 140-141 mph. I made one run that I engaged the nitrous (150 shot) at about 60' and the car went 8.995 at 154.
Your next motor will need -9's or even -10's
I think your plan will gain an appreciable amount of MPH, but not much et. I agree with Daren that you need to put the power to the car as quick as possible to get a 9 sec slip. NA converters are not efficient nitrous converters, granted we are only talking about a 100 shot, but the rule still applies.
Not totally an apples to apples comparison; but when I first ran nitrous in my current car the car would go 9.40's on the motor at 140-141 mph. I made one run that I engaged the nitrous (150 shot) at about 60' and the car went 8.995 at 154.
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
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From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
Well, it takes A LOT more HP to drop 4 tenths in a mid 9 second car than it takes in a mid 10 second car. I believe that spraying in high gear (short shifting) will get me into 10's on a cold day.. I have not run my current setup (without the spray) in sub 60 degree weather yet. I believe that my car is capable of 10.1x on engine on a 45 degree day with a dewpoint in the 20 degree range..
Go run it Oliver, and then we will find out for sure.
Racer
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From: Geneva Ohio
Going 9 seconds at 135 MPH without a cage is crazy if you ask me.
Our local track asked us to stay out of the nines last year even with an 8 point cage until I got the chassis certified, an SFI-3.2A/5 rated fire suit, and a NHRA competition license.
So be aware, going 10.0 is a lot cheaper than going 9.90
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From: Corsicana, Tx
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
I will very likely only make one 9 second pass and after that, I'll only use it for the 10.0 index race (only in high gear) and as strategic shot for bracket racing (in case that I spin off the line)
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Just trying to keep you safe Olivier!
Going 9 seconds at 135 MPH without a cage is crazy if you ask me.
Our local track asked us to stay out of the nines last year even with an 8 point cage until I got the chassis certified, an SFI-3.2A/5 rated fire suit, and a NHRA competition license.
So be aware, going 10.0 is a lot cheaper than going 9.90
Going 9 seconds at 135 MPH without a cage is crazy if you ask me.
Our local track asked us to stay out of the nines last year even with an 8 point cage until I got the chassis certified, an SFI-3.2A/5 rated fire suit, and a NHRA competition license.
So be aware, going 10.0 is a lot cheaper than going 9.90
Depending on my funds available, I might even try to build the fastest IRS Vette.. I believe that the fastest one is running 8.40's right now...
BTW, my setup is very efficient and I will not need 135 mph to get into 9's.. I should be able to get there with about 132 - 133 mph.. I've run 10.59 at under 124 mph..and 10.50 flat at about 125mph, 10.40 at 126.77 and 10.35 at 127.59 mph
Last edited by GrandSportC3; Jan 7, 2007 at 02:01 PM.
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Burning Brakes
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From: laingsburg MI
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been following with lots of interest! apologize for going slightly off topic, oliver, but i wonder what you think your current set up would have run if you still had your 383 & 5 sp.? You turned good times then & it seems you have really sorted out your chassis. Not coincedently, i have a 383 & 4 sp. manual. jim
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
been following with lots of interest! apologize for going slightly off topic, oliver, but i wonder what you think your current set up would have run if you still had your 383 & 5 sp.? You turned good times then & it seems you have really sorted out your chassis. Not coincedently, i have a 383 & 4 sp. manual. jim
Stick shift cars with the appropriate gearing that are properly driven (power shifting and hard launch) will usually be faster than automatics..
However, a M21 with the crappy 2.20 first gear would've been a lot slower. I had the TKO and it had a 3.27 first gear etc... I believe that if I'd have a TKO in the car right now, I'd be running in the 9's on engine but I'd also break a lot of parts...
My chassis setup was appropriate for 465 HP before but with more horsepower, you need to upgrade the suspension..
Well, if I had the 383 with the 5-speed in the car right now, it would run about 11.30's on a cold day. (took weight off the car since running 11.60's with the old setup)
With the current automatic transmission, I'd probably run 11.50's or so right now... That's just my guess...
Last edited by GrandSportC3; Jan 7, 2007 at 02:58 PM.