Fairmont 472 Eddy head 649hp index car ......9.77 @132mph 10/31/18 *added videos

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Post  5pointslow on April 13th 2019, 10:01 pm

Plugs have looked fine after my passes

At my weight and hp and I missing something I feel like you guys are expecting more et out of her. I just thought at weight and hp it was at were it wasnt going to go any faster
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Post  DanE on April 14th 2019, 9:09 am

Actually, I believe that it runs very well. I was surprised that the engine planed as early in the run as it did.
Increase the total timing by 4 degrees and see if "stanger 68" is on to something.

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Post  68galaxie on April 14th 2019, 1:34 pm

Your car looks great!

I agree there is something happening once in high gear. Could be converter issue? Not sure

If one looks at the Wallace Racing 1/4 mile calculator it shows something interesting.
9.77 et @ 2900 lbs shows 615 hp.
132 mph @ 2900 lbs shows 514 hp.

There certainly is something holding back the mph past half track.
Not sure if it is fuel related or timing or converter issue.

I am sure you will get it figured out Smile

Sweet ride!!
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Post  68galaxie on April 14th 2019, 1:40 pm

Looking at your 1/8 mile times.

Using eighth mile calculator:

2900 lbs and 650 hp
Shows 6.04 @ 113 mph.

You are very close to running what it should at the eighth mile mark.
Something happens during the last eighth mile - as you can hear and probably feel (video shows this too)
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Post  5pointslow on April 14th 2019, 4:08 pm

Thanks for info,
Running 10.00 index and 10.50 have to slow up

If I make any all out passes or try to gain pb times I will look into it more right now today car was very consistent on tree and 10.50 mark

Converter is a BTE , maybe the converter is holding back
I know it feels great out of the hole all the way to 1/2 track and planes out . I'm also new to this being a new car and coming from street cars . So it's all a learning curve but I'm having fun and should be competitive in 10.50 index
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Post  5pointslow on April 15th 2019, 6:20 am

yesterday testing for 10.50 index

on a .400 pro tree

went .023 on tree with a 10.496
went .033 on tree with a 10.51


another thing to add is im launching at 4300 rpm with transbrake/2 step my convertor flashes 5100-5200 rpm
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Post  5pointslow on April 15th 2019, 3:01 pm

68galaxie wrote:Looking at your 1/8 mile times.

Using eighth mile calculator:

2900 lbs and 650 hp
Shows 6.04  @ 113 mph.

You are very close to running what it should at the eighth mile mark.
Something happens during the last eighth mile - as you can hear and probably feel (video shows this too)


it maybe gearing , my peak hp on dyno is at 6300 rpm i would have to see were i am on the track but i feel by the 1/8th mile im already up there rpm wise and in 2nd gear (glide)
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Post  68galaxie on April 17th 2019, 4:44 pm

The gear ratio could certainly be the issue! I didn't realize you had a 4.10 gear (just re-read thread)
The BTE converter is likely not the issue. (Looks like many like BTE converters and transmissions)
Not sure what camshaft specs are, but some cam specs may not carry much beyond peak HP. In your case 6300 ish.
Perhaps valve float issues above 6500 rpm?

Anyhow, car looks awesome!!





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Post  rmcomprandy on April 17th 2019, 6:36 pm

68galaxie wrote:The gear ratio could certainly be the issue! I didn't realize you had a 4.10 gear (just re-read thread)
The BTE converter is likely not the issue. (Looks like many like BTE converters and transmissions)
Not sure what camshaft specs are, but some cam specs may not carry much beyond peak HP. In your case 6300 ish.
Perhaps valve float issues above 6500 rpm?

Anyhow, car looks awesome!!

First, I would verify that the fuel delivery system is delivering enough volume of fuel to the carb and the carb isn't running on what is in the fuel bowl.  A restricted needle & seat or one to small can show the same thing.

Block-off the scoop entry to be sure that air going near the carb is not upsetting the fuel calibrations.

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Post  5pointslow on April 17th 2019, 7:33 pm

Magnafuel 300 pump
6 lbs at regulator to fuel log to carb
Davinchi 1080 dominator
Vp 113
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Post  5pointslow on April 17th 2019, 7:42 pm

Jetting
.090 square
Idle .040
Int .051
Hs .031

I honestly think I have a little more gear than I need but
I'm no pro and not ruling out anything for index racing and slowing the car up it's working

Running all out maybe I'm leaving some , but if you watch on car video shift light flashes at 6200 rpm I click 2nd gear not far into the run .
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Post  rmcomprandy on April 18th 2019, 9:17 am

5pointslow wrote:Magnafuel 300 pump
6 lbs at regulator to fuel log to carb
Davinchi 1080 dominator
Vp 113

Fuel VOLUME at the jet is not measured in PSI at the fuel log.  It is probably OK but, I would do a volume check to be sure.

Using .130" needle & seats are about right to be sure the fuel bowls remain full on that carb..

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