[BruceWilkie]

Originally Posted by blueghoast

I just wasn't sure how it would do with making that much timing diff all at once.
I'll try it and let you all how it works. We were sopposed to do a little
street racing tonight but the damb rain won't give us a break.

GT.

Start with less and work your way up . Keep in mind that unboosted your running a low compression motor on premium fuel! !!

Deb's 406 originally had 6x-8 heads. Ran fine even on 85 octane from the reservation pump. On 93 premium it notably felt slower. On 93 advancing to 20 initial brought response back but still required limiting total to@35 or you would risk light high rpm ping on a hot day-hot water temp as it approached 5000 rpm. That's a whole different curve than if setup for 87 or less.
20 initial allowed hot starts without kickback or to slow cranking. 22 was ok when motor was below warmup.
I put timing back to a "normal" 12 initial 36 total in by 2500 and convinced Deb her motor could run the cheap gas with no issue.

So...start with finding your motors "happy" initial advance for hot(heat soaked) starts. Keep your unboosted advance total "normal" . Pull timing as motor gets into boost. You'll probably need no more than 24-27 degrees final timing boosted at peak rpm.

[blueghoast]

Originally Posted by BruceWilkie

Start with less and work your way up . Keep in mind that unboosted your running a low compression motor on premium fuel! !!

Deb's 406 originally had 6x-8 heads. Ran fine even on 85 octane from the reservation pump. On 93 premium it notably felt slower. On 93 advancing to 20 initial brought response back but still required limiting total to@35 or you would risk light high rpm ping on a hot day-hot water temp as it approached 5000 rpm. That's a whole different curve than if setup for 87 or less.
20 initial allowed hot starts without kickback or to slow cranking. 22 was ok when motor was below warmup.
I put timing back to a "normal" 12 initial 36 total in by 2500 and convinced Deb her motor could run the cheap gas with no issue.

So...start with finding your motors "happy" initial advance for hot(heat soaked) starts. Keep your unboosted advance total "normal" . Pull timing as motor gets into boost. You'll probably need no more than 24-27 degrees final timing boosted at peak rpm.

Good info thanks. We did go out last night and I raced a guy 1/8 mile.
Never checked plugs until I got back home. Acording to the plugs
It needed more timing and looked a little rich yet, But that was after
the drive home. So- there is a local place by my area I'm going to make
A pass and I'll read the plugs right after the run. That will give me better
Information on my next step. All you guys have been a lot of help.
I'll let you know what I find out on the next pass I do. Thanks Again.

GT.

[blueghoast]

We went out and did some racing last night, I didn't change any thing
And the car performed great. Checked the plugs after run and they
look pretty darn close. Timing is a bit slow but the car is working great
So I'm going to leave it alone for now. I am going to do a gear change.
Ether a 3:23 or 3:42. The car pulls hard and there's no issues, So it's time
to just have fun with it for a while. Thanks again all you've been a lot of help.
The 3:73 gear is just a little to much for it as this thing makes so much torqe.
The converter is great with no slippage. Sorry bout stealing your post but
Man what a source of info.

GT.

[er455]

Originally Posted by blueghoast

We went out and did some racing last night, I didn't change any thing
And the car performed great. Checked the plugs after run and they
look pretty darn close. Timing is a bit slow but the car is working great
So I'm going to leave it alone for now. I am going to do a gear change.
Ether a 3:23 or 3:42. The car pulls hard and there's no issues, So it's time
to just have fun with it for a while. Thanks again all you've been a lot of help.
The 3:73 gear is just a little to much for it as this thing makes so much torqe.
The converter is great with no slippage. Sorry bout stealing your post but
Man what a source of info.

GT.

Glad to hear it .. No worries on stealing my post , It helps me as well and I welcome anyone to chime in and comment on any of my posts ...I would go with the 3.23 . I have a 3.08 gear in mine with 28” tall tire and love it ...pulls like a freight train on top end .

[blueghoast]

Originally Posted by er455

Glad to hear it .. No worries on stealing my post , It helps me as well and I welcome anyone to chime in and comment on any of my posts ...I would go with the 3.23 . I have a 3.08 gear in mine with 28” tall tire and love it ...pulls like a freight train on top end .

Yeah that's prob what I'll do 3:23, Cause all the class races I'll be running
call's for a 28-inch tire. Thanks

GT.

[blueghoast]

Changed gear from 3.73 to 3.42 WOW What a difference that made.
I knew it would some but not like this. Thinking about the 3.23 yet.
Gona wait for a while and have some fun with this set-up for now.
The car is working great and running strong and not breaking or hurting
anything, So I'm going to enjoy it for now.

Thanks for all the info guy's.

GT.

[er455]

Cool I am waiting to go to the track to see if my 3.08 gear with a 28 “ tall tire is going to work before I swap to a 3.23 , they are so close that I don’t know if it worth doing ....

[ponjohn]

Originally Posted by blueghoast

Changed gear from 3.73 to 3.42 WOW What a difference that made.
I knew it would some but not like this. Thinking about the 3.23 yet.
Gona wait for a while and have some fun with this set-up for now.
The car is working great and running strong and not breaking or hurting
anything, So I'm going to enjoy it for now.

Thanks for all the info guy's.

GT.

How do you stage the car..on a 2 step...how many pounds...etc?


Does it pull the same out of the hole with the 3.42?

[charlie66]

Originally Posted by blueghoast

Changed gear from 3.73 to 3.42 WOW What a difference that made.
I knew it would some but not like this. Thinking about the 3.23 yet.
Gona wait for a while and have some fun with this set-up for now.
The car is working great and running strong and not breaking or hurting
anything, So I'm going to enjoy it for now.

Thanks for all the info guy's.

GT.

Just remember the lower you go the more stress you're putting on the crank . Do you have a forged or cast crank?