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RPM's on Blower Motor?

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Old Jan 21, 2004 | 10:33 AM
  #21  
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PSJ, so far I'm planning on running a 2.47 rear end ratio with 24.75" tires and keeping the T56 in 4th gear, and running an ATI blower at 6 to 7 psi. That combo would put the rpm at 6710 going 200 mph. I already have Comp 918 springs and poly swaybar bushings, and have lowered car 2 inches by cutting the springs. I'll probably lower it another 3/4 inch though to keep air from going under the car and floating the front end. I plan to use 4th gear to keep the driveshaft rpm down and to keep from loosing power through the overdrive ratios (I won't use 5th or 6th gear.)

The ugraded fuel pump and injectors sound like a good idea. Why do you recomend the Vortech kit over ATI?
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Old Jan 21, 2004 | 10:36 AM
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Why such a short tire?

Has anyone hit 500rwhp with a 6-7 psi ATI and your cam?
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Old Jan 21, 2004 | 10:49 AM
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The short tires are to get the car as low to the ground as possible. Any air that goes under the car at that speed creates a high presure zone that can turn the car into an unstable airplane.

There seem to be others getting 500 rwhp on 6-7 psi but with other cams (small cams with low overlap.) My cam is longer duration than these but does have a small amount of overlap (4 degrees.) Hopefully this will work.
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Old Jan 21, 2004 | 11:52 AM
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Those 2.47's will make the car hard to drive on the street, I sold my old 2.73 rearend to a buddy who had an SS M6 and it was way too little gear for the street.

I think the Vortech kits work consistently.

My cam has 3.5 degrees of overlap.
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Old Jan 21, 2004 | 12:33 PM
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Yeah I know it will be a dog off the line with the 2.47's, but the beauty of a 9 inch is you can swap ratios at will, so won't have to drive it on the street that way. Sounds like my cam will be OK with the 4 degree overlap. If there is a better blower kit available like the Vortech, that's what I need to know now, I like to use the best parts available for my car even if it costs a little more.
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Old Jan 22, 2004 | 10:21 AM
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I too would run shorter gears in the rear, and use 5th to go to top speed. Good luck on your run!

Mike M
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Old Jan 22, 2004 | 10:24 AM
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I would run more gear, my buddy said that he had to slip the clutch like crazy. Plus that is bad for your clutch since you have no gear to help it roll out.

I have a 9" too I just never got a second center section because it's expensive.
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Old Jan 22, 2004 | 11:24 AM
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How much power pickup do you think there is with my 372c.i. motor if I went from a 214/218 .540/.550 114lsa to a 226/234 .590/.600 114lsa or something slightly larger
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Old Jan 22, 2004 | 01:05 PM
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Originally Posted by LS1Bird
I too would run shorter gears in the rear, and use 5th to go to top speed. Good luck on your run!

Mike M
The problem with using 5th gear is it's an overdrive ratio, so significant power is lost running through the overdrive gears, whereas 4th is straight through, 1:1 ratio, meaning the power doesn't flow through any cogs. Another problem with using an overdrive is it spins the driveshaft faster, possibly beyond it's crittical rpm. So in overdrive you spin the driveshaft up fast with the overdrive, then bring the rpm way back down with the deep axle gears; all this causes more heating of the differential also and could even require a presure oil feed to the pinion bearings.

I figure I already took the drive train to it's limit running 160 mph in 5th gear with the 4.11 rear.

Last edited by Cal; Jan 22, 2004 at 01:29 PM.
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Old Jan 22, 2004 | 01:07 PM
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Alrighty.
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Old Jan 22, 2004 | 01:12 PM
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Originally Posted by Pro Stock John
I would run more gear, my buddy said that he had to slip the clutch like crazy. Plus that is bad for your clutch since you have no gear to help it roll out.
Since everybody drag races, it's hard to think outside of that sometimes. In Land Speed Racing, you don't accelerate hard off the line because you have several miles to get up to speed. So it isn't really hard on the clutch at all, unless of course the clutch slips even when fully engaged. But no, there is no high-rpm, clutch dumping starts.
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Old Jan 22, 2004 | 01:22 PM
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Originally Posted by Pro Stock John
I have a 9" too I just never got a second center section because it's expensive.
That's true, but at least it won't be as expensive as my aluminum center section with the 4.11s was. A cheaper iron center section is actually better for Land Speed racing, because it puts more weight on the rear tires, improving traction on the loose salt. And 2.47 gears are much cheaper, because it's a stock Ford ratio that most people want to get rid of so they can put 4.11's in!

Last edited by Cal; Jan 22, 2004 at 01:30 PM.
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