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Author
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Topic: Want to "soften" the launch a little
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kid vishus
Gearhead Posts: 5248
From: middle of NC
Registered: Oct 2000
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posted 03-24-2003 05:01 PM
   
Here's the deal, I went racing saturday. the car ran pretty good, but my 60' times arent as consistent as I would like. (I'm being picky). In the third round, I lost a significant amount of time in the first 60', and ended up losing the round by .001. Due to the 60' being off from the previous pass, the car slowed .03.
Here are my 60' times, 330' times and et/mph, the first two are time runs, the next 3 are elims.1.351, 4.040, 6.323 @ 108.29
1.348, 4.027, 6.302 @ 108.78
1.352, 4.030, 6.307 @ 108.74
1.343, 4.019, 6.289 @ 109.06
1.356, 4.042, 6.319 @ 108.86 All passes were made in the same lane, and the air was getting better as the night wore on. What I'm thinking is, I currently have 40* of total timing in it and 2 stepping it at 4200. I am considering turning the 2 step down to 4000 (the smallest chip I have) and backing the timing off to 38*. It will slow the car down some, but it "should" also make the launch a little softer and hopefully more consistent. Does this sound like the correct direction to head, or should I be loking at something else? Just wanting some other opinions before I go change some stuff.
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F551
Gearhead Posts: 183
From: Manitoba, Canada
Registered: Nov 2000
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posted 03-24-2003 07:15 PM
Can you provide the times you made the passes at? You have that patern of slow, fast.... Maybe the converter likes a little heat to give the better 60'.When we had problems with the 60' it was always tires. Our car beats the S%@#! out of them - a set a year  ------------------
Fred
68 Mustang 500CID/Powerglide - "No Tubs"
86 Mustang GT Cobra
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steve'66
Gearhead Posts: 7226
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-24-2003 08:13 PM
Rob,That's the right direction, but I wonder when our t/c stall is soo high that the engine really never sees the bottom end during a run.  In other words we try to kill off some bottom end, but the engine never runs that low of rpms to be affected.  SteveW
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kid vishus
Gearhead Posts: 5248
From: middle of NC
Registered: Oct 2000
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posted 03-24-2003 09:32 PM
Times were ran as followed.
Run
#1 3:00 PM
#2 4:14
#3 4:59
#4 5:59
#5 6:37
#6 7:21My tires have 82 passes on them right now. My burnouts are fairly mild now. They used to be fun (see: excessive). I had the rear shocks set on full soft before I ever made a pass. With all the rain and rainout weekends we have had, I questioned the amount of rubber on the track before I ever made a pass. Steve,
you maybe right, with a 6000 rpm convertor, and a 3 speed trans, it probably doesn't ever see "bottom end" power. I did tighten valve lash up .003 before I ran it this last time.
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Moneymaker
Administrator Posts: 21725
From: Lyons, IL, USA
Registered: May 99
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posted 03-25-2003 12:16 AM
KV, why don't you try raising the launch RPM to 4800 or 5100?
At 5100 you will kill off a bunch of the converter flash, stay out or the peak torque range and soften the hit.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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Butch Jennings
Gearhead Posts: 611
From: No. California
Registered: Apr 2000
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posted 03-25-2003 07:23 AM
If my car was that good (consistent) I don't think I'd change a thing....lol.------------------
Butch
460 powered 1967 Comet Cyclone (Broken)
10.271 @ 130.231
Butcher's Home Page
"Friends don't let friends drive Chevys"
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kid vishus
Gearhead Posts: 5248
From: middle of NC
Registered: Oct 2000
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posted 03-25-2003 05:05 PM
quote:
Originally posted by Moneymaker:
KV, why don't you try raising the launch RPM to 4800 or 5100?
At 5100 you will kill off a bunch of the converter flash, stay out or the peak torque range and soften the hit.
I never thought of that. My car normally the higher I 2 step it, the quicker it runs (including 60').
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Dad Vishus
Gearhead Posts: 642
From: Moscow, Iowa, USA
Registered: Dec 2001
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posted 03-25-2003 05:49 PM
2 words: power glide!  ------------------
63 Falcon 377 Cleveland stroker Flying Toilet alchohol injection. 6.19 @ 110 MPH 1/8 mile
2002 Ranger FX4 daily driver
2000 F350 PSD Crew cab dually - Like commuting in a B52!!
98 US Cargo Phantom II 28'
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Moneymaker
Administrator Posts: 21725
From: Lyons, IL, USA
Registered: May 99
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posted 03-25-2003 07:00 PM
A powerglide is a boring ride.  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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kid vishus
Gearhead Posts: 5248
From: middle of NC
Registered: Oct 2000
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posted 03-25-2003 07:10 PM
quote:
Originally posted by Dad Vishus:
2 words: power glide!
I don't need no steenkeeng 2 speed. That's a chebby transmission. 
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F551
Gearhead Posts: 183
From: Manitoba, Canada
Registered: Nov 2000
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posted 03-25-2003 08:51 PM
Ahem - my car is not boring Kid - at sometime during the race did they groom the track? If someone broke off the line they clean and spray glue.... ------------------
Fred
68 Mustang 500CID/Powerglide - "No Tubs"
86 Mustang GT Cobra [This message has been edited by F551 (edited 03-25-2003).]
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kid vishus
Gearhead Posts: 5248
From: middle of NC
Registered: Oct 2000
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posted 03-25-2003 08:57 PM
quote:
Originally posted by F551:
Ahem - my car is not boring Kid - at sometime during the race did they groom the track? If someone broke off the line they clean and spray glue....
They only cleaned one time, and that was the big end of the track. I'm sure your car isnt boring. But a powerglide behind my little inch motor is a different story. I tried it once, and it slowed the car down 3 tenths in the 1/8. I'll let everyone know what happens this weekend. I may or may not change anything other than launch rpm.
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jsracingbbf
Gearhead Posts: 2160
From: Batesville,MS. , U.S.A.
Registered: Mar 2002
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posted 03-25-2003 11:34 PM
quote:
Originally posted by Moneymaker:
A powerglide is a boring ride.
HEY! My Power glitch is NEVER boring! It's always interesting to bet to see if it will make ONE more pass!
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Jerry
69 Mustang Pro ET Drag
70 Mustang retired former footbrake car
Jerry: (speaking to Jeff) " you gonna take your doors off first round time trials?"
Jeff: (chevy guy, friend) No stupid why would I wanna do that?
Jerry: thought you might want to save them since I'm gonna blow them off anyway ( shrug walk off)
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