RACING What did I miss? (cry for help)

Clipclop80

Not-quite-so-new-guy
Thread starter
Apr 9, 2021
21
3
inline fuel filter is fine. haven't dropped the tank to have a look...
I was thinking of trying a higher stall converter, and or 4;10 rear end gears. its a long legged b*tch.
60 MPH rpm is 2000-2100 on the highway and if I hit the lockup switch it drops another 200 rpm.
 

Clipclop80

Not-quite-so-new-guy
Thread starter
Apr 9, 2021
21
3
thought id post a photo... AF5D9070-CED9-418C-BC00-90812D90F85A.jpeg
4A7C0F17-022D-4610-930D-7629F5621E71.jpeg
 
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64nailhead

Goat Herder
Supporting Member
Dec 1, 2014
3,585
113
Upstate NY
New to forum, guys... but I need a hand.

air shocks in rear
any help is appreciated.

You haven’t mentioned your converter - what is it.
You’re crossing the line at 5200-5500rpms , correct? If not then what rpm is it?

And you really need to lose the air shocks. A good set of KYB’s or Bilsteins would help. A set of good drag shocks would be even better.

I agree with Fleming, you need to drop the 60’. A 1.60 puts you under 12. And I’ll reiterate, nitrous will put this in the 10’s. First things first though, converter and shocks?
 
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Streetbu

Know it all, that doesn't
Supporting Member
May 22, 2011
2,753
113
Central NY
If you have the graph for the dyno run, make sure you're shifting at the right rpm. When it changes gears you should be a few hundred rpm below your peak torque. Fixing that 60' time will definitely help too. Should be 1.6 or better.
 
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bracketchev1221

Royal Smart Person
Jan 18, 2018
1,051
113
I’m curious about the converter, but the car is down leaving the starting line. Is it tire spin or just low hp? How bad is the exhaust? That can kill it. Here is my combination from 25 years ago.

540 hp 427
Powerglide with 5200 converter
4.88 gears with 10x29 slicks
Car weighed 3675 with me in it
I had a flowmaster 2 1/2” exhaust out to the bumper with walker super turbo mufflers to keep it quiet as you say.

with exhaust 12.05
Taking exhaust off completely 11.27
Ultimately ran 11.05 at 118 but the 60’ was mid 1.50’s.
 
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Texas82GP

Just-a-worm
Supporting Member
Apr 3, 2015
7,146
113
Spring, Texas
I was thinking 1-5/8 primaries sound small for a 406 and what mufflers? If it's pretty quiet then they may be restrictive. You probably want a straight through design.
 
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Clipclop80

Not-quite-so-new-guy
Thread starter
Apr 9, 2021
21
3
Good to know 39F! can you give any more details on the improvement?
The changes I see to be most effective are to go to 1-3/4" headers, a 3000 stall, deal with the front & rear shocks, and higher flow thru mufflers .
This forum has been an excellent resource for recommendations and advice!
 
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