first n2o passes do not result in new best ET - Page 2 - Chevelle Tech
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post #16 of 25 (permalink) Old Nov 27th, 19, 4:49 PM
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Chris
 
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Re: first n2o passes do not result in new best ET

What front shocks are you running? They should be slow rebounding so it keeps the nose up a lil to keep the rear planted.

73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


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post #17 of 25 (permalink) Old Nov 27th, 19, 4:55 PM
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Re: first n2o passes do not result in new best ET

Quote:
Originally Posted by Supernova72 View Post
3.25 rear gear, factory th400 first can't remember if that's 2.48 or 2.51. the car weighed about 3550 before adding the bottle and standalone kit.
Turbo 400 is 2.48 low gear. You're running 10.0 with a 3.25 gear? I would not complain about that one bit, nice passes hit that n20 sooner out of the hole and I will put money on it that you'll get your 9.
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post #18 of 25 (permalink) Old Nov 27th, 19, 7:09 PM
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Re: first n2o passes do not result in new best ET

Not messed with Nitrous much, but if it's not spinning hit it sooner.... The mph looked good for a 9 something... Your almost there... Will you have anymore chances this year to get it out ???
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post #19 of 25 (permalink) Old Nov 28th, 19, 7:42 AM
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Re: first n2o passes do not result in new best ET

Quote:
Originally Posted by Supernova72 View Post
My car unloads a little fast NA so I wanted to be conservative with how quick it came in but the car has been 10.20s-10.30s NA in similar DA in the past. my 330 was about the same whether I was all in at 2 seconds, 4 seconds, or NA.
Why would you wait for your car to unload and lose traction to apply more power?

What I found spraying 100 shot on Dunlop tires was that there is a golden window to let it eat...for two reasons. The first foot or two is where your tires are buried in the track...it's when you have the most traction and two, it gives the most benefit in 60' and ET. If you're traction limited, you don't want to start spraying at the same time the converter is blasting your rear tires, but you want to be right on its heals. Certainly don't wait for that suspension to unload - keep it lifting.

For me, that golden window was no-purge, when my foot hit the floor, wait until I just start to feel the car react and then activate the nitrous with my thumb on the shifter. What you have is 1.71 60' on motor, getting kicked in the rear by 1.60 60' on spray.

If I hit the spray at the same time as throttle, it would blow the tires and run high 12s @ 114, if I waited for the front to settle, it would blow the tires and run 12.2 @ 114. If I hit it in the golden window, it would stick and run 11.47 @ 117.

1981 Malibu wagon
406/350/4.10
Best ET NA 12.20 @ 110
Best ET w/N2O 11.47 @ 117
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post #20 of 25 (permalink) Old Nov 28th, 19, 8:17 AM
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Re: first n2o passes do not result in new best ET

Quote:
Originally Posted by WHT/73 View Post
What front shocks are you running? They should be slow rebounding so it keeps the nose up a lil to keep the rear planted.
you're talking about using a stiff COMPRESSION setting, right? Not a stiff extension.

Quote:
Originally Posted by 68Chevele View Post
Turbo 400 is 2.48 low gear. You're running 10.0 with a 3.25 gear? I would not complain about that one bit, nice passes hit that n20 sooner out of the hole and I will put money on it that you'll get your 9.
X2 a 2.48 first is the stock configuration. And yes, I'm surprised to hear about his rear gear ratio too. The reason I had asked the question about rear gear choice he has, is because in the video it looks like his car is leaving the line pretty soft. The rear gear choice is why,( but now I'm wondering about his stall speed RPM too).

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post #21 of 25 (permalink) Old Nov 28th, 19, 5:05 PM
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Re: first n2o passes do not result in new best ET

criminy, you're at 10.0/133/1.446 with a 3.25 gear? I would have thought 4.11 or 3.73. is that 3.25 right?
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post #22 of 25 (permalink) Old Nov 28th, 19, 11:24 PM
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Re: first n2o passes do not result in new best ET

Quote:
Originally Posted by Tom Mobley View Post
criminy, you're at 10.0/133/1.446 with a 3.25 gear? I would have thought 4.11 or 3.73. is that 3.25 right?
That's one reason I plan to drop some gear in my car when I go back to the BBC again sometime next year. BBC's like to pull with all that torque.
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post #23 of 25 (permalink) Old Nov 29th, 19, 9:00 AM
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Re: first n2o passes do not result in new best ET

Quote:
Originally Posted by 68Chevele View Post
That's one reason I plan to drop some gear in my car when I go back to the BBC again sometime next year. BBC's like to pull with all that torque.
Do you remember this article from Hot Rod June 1995?

Having the correct stall is more important than having the correct gear. True with big block or small block. Some of us just choose neither lol
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1981 Malibu wagon
406/350/4.10
Best ET NA 12.20 @ 110
Best ET w/N2O 11.47 @ 117
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post #24 of 25 (permalink) Old Nov 29th, 19, 9:43 AM
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Chris
 
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Re: first n2o passes do not result in new best ET

Yes Bill. I guess I was using motorcycle (dirt bike) terminology.
So it extends fast and slowly comes back down.
At least that's the way my Calvert 90/10's were.
No adjustments on them.
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73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


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post #25 of 25 (permalink) Old Nov 29th, 19, 10:09 AM Thread Starter
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Bob
 
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Re: first n2o passes do not result in new best ET

Quote:
Originally Posted by WHT/73 View Post
What front shocks are you running? They should be slow rebounding so it keeps the nose up a lil to keep the rear planted.
Front shocks are CE90/10
Quote:
Originally Posted by 68Chevele View Post
Turbo 400 is 2.48 low gear. You're running 10.0 with a 3.25 gear? I would not complain about that one bit, nice passes hit that n20 sooner out of the hole and I will put money on it that you'll get your 9.
I do run 3.25 gears, mostly for hwy travel for race weeks. I was trying to keep the rpm a little lower for those long drives.
Quote:
Originally Posted by TAG55 View Post
Not messed with Nitrous much, but if it's not spinning hit it sooner.... The mph looked good for a 9 something... Your almost there... Will you have anymore chances this year to get it out ???
It's not looking good to do anything else in 2019
Quote:
Originally Posted by dragginwagon406 View Post
Why would you wait for your car to unload and lose traction to apply more power?

What I found spraying 100 shot on Dunlop tires was that there is a golden window to let it eat...for two reasons. The first foot or two is where your tires are buried in the track...it's when you have the most traction and two, it gives the most benefit in 60' and ET. If you're traction limited, you don't want to start spraying at the same time the converter is blasting your rear tires, but you want to be right on its heals. Certainly don't wait for that suspension to unload - keep it lifting.

For me, that golden window was no-purge, when my foot hit the floor, wait until I just start to feel the car react and then activate the nitrous with my thumb on the shifter. What you have is 1.71 60' on motor, getting kicked in the rear by 1.60 60' on spray.

If I hit the spray at the same time as throttle, it would blow the tires and run high 12s @ 114, if I waited for the front to settle, it would blow the tires and run 12.2 @ 114. If I hit it in the golden window, it would stick and run 11.47 @ 117.
The car unloads faster than I may be able to get the progressive to hit? Only 3 passes into the n2o game. If it had been a fully prepped track that was being dragged and glued every other hour I would have tried more power sooner. I have to chalk it up as a learning experience. I honestly thought it as going to be easy to get a 9.99 adding the hundred at any point whether it was full on for 6 or 8 seconds of the pass.

Quote:
Originally Posted by BillyGman View Post
you're talking about using a stiff COMPRESSION setting, right? Not a stiff extension.

X2 a 2.48 first is the stock configuration. And yes, I'm surprised to hear about his rear gear ratio too. The reason I had asked the question about rear gear choice he has, is because in the video it looks like his car is leaving the line pretty soft. The rear gear choice is why,( but now I'm wondering about his stall speed RPM too).
the rears are 3 way CE set at 50/50. I have 9 way Calvert rears but their stiff setting for long drives loaded down seems to bounce and clack the caltrac bars a bunch. I usually haul a 75 lb floor jack and misc stuff to the tune of 200 lb back there. The CE are better for the drives hands down. I am starting to favor the track experience over the road trip in an effort to compete more in the local tracks street car program. I was the only guy running NA it seems.
Quote:
Originally Posted by Tom Mobley View Post
criminy, you're at 10.0/133/1.446 with a 3.25 gear? I would have thought 4.11 or 3.73. is that 3.25 right?
yes, it's a 3.25

Bob
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60' 1.446 10/24/2018
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