Changed from 5.14 to 3.50

Posted By: D-50

Changed from 5.14 to 3.50 - 04/30/10 03:15 AM

I have a 360/380 hp crate engine in my D-50 truck. I was running 5.14 gears and my best E.T. in the 1/8 was a 7.46 @ 91 mph. I shift at 5600 rpm. Last weekend I put 3.50 gears in it. I went to T&T tonight and run it. How much do you think it slowed down ? I crossed the finish line in 2nd gear.

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Posted By: Anonymous

Post deleted by Defbob - 04/30/10 03:19 AM

Posted By: sixpackgut

Re: Changed from 5.14 to 3.50 - 04/30/10 03:22 AM

2 tenths

Posted By: Cab_Burge

Re: Changed from 5.14 to 3.50 - 04/30/10 03:39 AM

Quote:

I have a 360/380 hp crate engine in my D-50 truck. I was running 5.14 gears and my best E.T. in the 1/8 was a 7.46 @ 91 mph. I shift at 5600 rpm. Last weekend I put 3.50 gears in it. I went to T&T tonight and run it. How much do you think it slowed down ? I crossed the finish line in 2nd gear.

Not much,(at tenth or two max) especailly if your spinning the tires with the 5:14 gears

Posted By: Sport440

Re: Changed from 5.14 to 3.50 - 04/30/10 03:56 AM

Quote:

I have a 360/380 hp crate engine in my D-50 truck. I was running 5.14 gears and my best E.T. in the 1/8 was a 7.46 @ 91 mph. I shift at 5600 rpm. Last weekend I put 3.50 gears in it. I went to T&T tonight and run it. How much do you think it slowed down ? I crossed the finish line in 2nd gear.

You may of increased your ET. 5.14 gears are pretty steep, and can make that first gear pretty useless depending on tire size and tranny gear.

You know this allready, I can tell.

Your first gear is your Best accelerating gear.

With a switch in axel gearing even a second gear tranny combo can equal a first gear tranny combination for a equal gear multiplication. mike

Posted By: Anonymous

Post deleted by Defbob - 04/30/10 04:25 AM

Posted By: Irun5snd8th

Re: Changed from 5.14 to 3.50 - 04/30/10 06:05 AM

Maybe .08

Posted By: Dodgem

Re: Changed from 5.14 to 3.50 - 04/30/10 11:59 AM

4 tenths and 2 mph

Posted By: chris3

Re: Changed from 5.14 to 3.50 - 04/30/10 02:22 PM

I'm waiting for you to tell me the results. I have just changed from 513 to 488. How much does your truck weigh? What trans?

Posted By: Anonymous

Post deleted by Defbob - 04/30/10 02:49 PM

Posted By: gremlinsteve

Re: Changed from 5.14 to 3.50 - 04/30/10 06:52 PM

ill guess...7.80's

steve

Posted By: Cab_Burge

Re: Changed from 5.14 to 3.50 - 04/30/10 07:54 PM

Okay, time for the results

Posted By: 9 Sec Phill

Re: Changed from 5.14 to 3.50 - 04/30/10 08:27 PM

I think it didnt slow down, it went faster....Phill

Posted By: sixpackgut

Re: Changed from 5.14 to 3.50 - 04/30/10 09:29 PM

Quote:

not to hijack Glenns thread, but a buddy went from 4.56 to 5.38s and picked up 4 tenths. 7.80s to 7.40s in the 1/8. heavy car small motor.

Posted By: D-50

Re: Changed from 5.14 to 3.50 - 04/30/10 10:13 PM

My best ET with the 5.14 was 1.54 60 ft. 7.46 @ 91 mph crossing the finish line at about 6000 rpm in high gear. It has a 904 trans. Last night with the 3.50 gears I had a best of 1.65 60ft., 7.66 @ 90mph crossing the stripe in 2nd gear. It has 315/60 15 M/T drag radials on it.

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Posted By: Anonymous

Post deleted by Defbob - 04/30/10 10:19 PM

Posted By: maximum entropy

Re: Changed from 5.14 to 3.50 - 04/30/10 10:23 PM

i bet with a different converter you could get your .2 back.

Posted By: D-50

Re: Changed from 5.14 to 3.50 - 04/30/10 10:31 PM

The first pass I made it felt so sick I thought I had it second gear. I also tried something else last night I put my old NOS plate on this week and sprayed it with 47 fuel/53 n2o jets suppose to be 100 shot.

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Posted By: D-50

Re: Changed from 5.14 to 3.50 - 05/01/10 12:36 AM

Forgot to tell what it ran on 100 shot, 7.14@95mph, 1.53 60 ft.Thinking about trying 125 next.

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Posted By: cj38

Re: Changed from 5.14 to 3.50 - 05/01/10 02:24 AM

I was surprised it did'nt loose more et. I was expecting 7.80's/7.90's.

Posted By: Cab_Burge

Re: Changed from 5.14 to 3.50 - 05/01/10 03:17 AM

Quote:

The first pass I made it felt so sick I thought I had it second gear. I also tried something else last night I put my old NOS plate on this week and sprayed it with 47 fuel/53 n2o jets suppose to be 100 shot.

Isn't it amazing on how different the cars feel with less gear and then they don't slow down as much as you think they did

time for a low low gear set in the trans

Probally pick up .15 to .25

Posted By: Anonymous

Post deleted by Defbob - 05/01/10 03:43 AM

Posted By: D-50

Re: Changed from 5.14 to 3.50 - 05/01/10 02:50 PM

I only made 3 passes on motor and it ran pretty consistent. It ran 7.66,7.67 and 7.68. I was going to run in the footbrake class at I-22 today but I think it is going to rain.

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Posted By: tjmarcus1

Re: Changed from 5.14 to 3.50 - 05/01/10 06:52 PM

6k is too much for those crate motors. put a 4.56 in it, or taller tires with the 5.14