Ordered the new converter

556 Views 3 Replies 2 Participants Last post by camachinist, Mar 31, 2001

Hottarod

Discussion Starter · Mar 31, 2001

I got sick and almost threw up when I had to plop down the $320 deposit to put it on order, heh.

I spent quite a bit of time going over my whole set up with the owner of the racing shop. I have thought that I went with too tall a tire but he said he thinks it will be just about right. The only thing that came up is that I didn't degree in my motor(got no excuse for it). My cam may be a bit more advanced than 4 degrees which will shift the power band upwards some but it isn't by much. It feels like its pulling hard up to 7000 but the book specs on my cam say 6500.

This will be a custom built 8 inch with 3000 rpm on the foot brake and a flash of 4700 rpms. That should wake my car up and fix my current run of carb/idle problems.

You can see my 65 fastback at: http://hottarod.stangnet.com/
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camachinist

· #2 · Mar 31, 2001

Looks like you have about a 27" tire on the car....with 4.62's, that sounds about right...

Running the engine to 7K in the lights and allowing for 300 rpm for converter slip, you should be in the 117 mph range...that's good for high 11's...maybe low 12's if the car doesn't leave real well...

I run the engine in the race car to 6600 in the lights running 118 or so...5.14's and a 31" tire....fairly tight 10" converter...flashes to 3200.....my tires grow a bit in circumference at high rpms so the numbers won't exactly reflect the formula....it seems tire growth neutralizes converter slippage in my case...

BTW, a decent 8" converter runs between 700 and 1K these days...that's why I went with the 10"...the W doesn't need to leave that hard to run consistent...still gets 1.57's -1.60's on the 60'...

Pat
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Hottarod

Discussion Starter · #3 · Mar 31, 2001

It occurred to me a while back that I'm going down a road you've been down already, LOL. We figured me at about 107 with 6% slip at around 6500 rpms give or take(27 inch tires). I don't think I have the grunt in this thing to go 7 in the traps but it might surprise me with the new converter.

You can see my 65 fastback at: http://hottarod.stangnet.com/
http://members.aol.com/macstang/Gifs/macstang3.jpg

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camachinist

· #4 · Mar 31, 2001

Biggest help to your little engine in the traps is aerodynamics and low rolling resistance...

Yeah, I've been down this road before, getting a 289 into the 11.20'[email protected] of it came from getting the car light and low....and paying attention to the little things like alignment and bearing lubes and rear tracking....like blueprinting an engine only more work..*G*

Take a look at the before and after pix on my race car page and note the difference in car height and attitude...lowering the car and adding the Shelby racing apron to the new front end helped stability and handling at speed immensely...those mods were worth over .3 and 2 mph...and I felt a whole lot safer doin a dance at the big end to get a win light...

Except for the fact that the car is set up for straight line and doesn't corner well, it feels slower at 120 now than my D-coder does at 70.....I attribute this mostly to aerodynamics...

Keep us posted on your progress....I would suggest getting some et slips before the converter change (if you haven't already) to baseline the combo and observe the changes...

Remember, with the 8" converter, suspension, front and rear, will become more important in getting the power to the ground.....

Pat
http://albums.photopoint.com/j/View?u=1570936&a=11937754&p=42910787.jpg

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