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Gearing a street/strip 500" BB #2454565
02/20/18 02:43 PM
02/20/18 02:43 PM
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Thinking about pulling the 3.91s out of this thing & going 3.55. Has a 3500-stall converter. Makes enough torque that it seems a 2800 converter, 3.55s & 28-30" tire would work well.
With the 3.91s & 3500 stall, it would be pretty busy on the 65-70 MPH ride for 90 minutes to the nearest track. Swapping to 30" tires should help that, but maybe not enough.
Looked at several gear/MPH calculators, and accounting for slippage, I'm still undecided. Whaddya think?

Re: Gearing a street/strip 500" BB [Re: topside] #2454612
02/20/18 03:51 PM
02/20/18 03:51 PM
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Downtown Roebuck Ont
Twostick Offline
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3.23.

You have enough torque and converter to haul the mail any way you want and it will be more freeway friendly.

Kevin

Re: Gearing a street/strip 500" BB [Re: topside] #2454618
02/20/18 03:58 PM
02/20/18 03:58 PM
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I would think the converter would need tightening up...

Re: Gearing a street/strip 500" BB [Re: topside] #2454639
02/20/18 04:38 PM
02/20/18 04:38 PM
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Aurora, Colorado
451Mopar Offline
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It might depend on the torque converter? I changed from an older design 10" Dynamic 3,500 stall that was good, but on the loose side to where it slipped fairly easy below the stall speed. The new converter is a custom (and expensive) tight 9" from Ultimate. It flash stall speed is close to 5,000 RPM, but I don't notice any slippage (more than a stock converter) in normal driving. It's nice for the street, but maybe too tight at the track?

Re: Gearing a street/strip 500" BB [Re: topside] #2454645
02/20/18 04:54 PM
02/20/18 04:54 PM
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Has a PTC 9.5" converter, I should call them and see what they spec'd for the car.

Re: Gearing a street/strip 500" BB [Re: topside] #2454676
02/20/18 05:48 PM
02/20/18 05:48 PM
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chicagoland,usa
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buildanother Offline
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Have 3.54 gears in an F body here with PTC 9.5, and with the 275.50r15's (around 26" dia.) drag radials, it goes about 3000 rpm at 65 mph. I would love to drop down to 323's if I could and try that. Even a 3.08 gear would probably work well.

Re: Gearing a street/strip 500" BB [Re: buildanother] #2454707
02/20/18 06:44 PM
02/20/18 06:44 PM
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N.E. Ohio
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Moparts member Prosport is running 10's with a 500" A body with 3.23 gear.
I believe he is running a 9 1/2" Dynamic converter.
https://board.moparts.org/ubbthreads/ubbthreads.php/topics/2416556/1.html

Last edited by KillerBee; 02/20/18 06:50 PM.
Re: Gearing a street/strip 500" BB [Re: topside] #2454749
02/20/18 09:04 PM
02/20/18 09:04 PM
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Oregon
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I have 3.54 gears in my '65 Coronet behind a 512 stroker and I'd go higher if I could. I think 3.20 would be good, maybe even a tad higher.

Re: Gearing a street/strip 500" BB [Re: topside] #2454807
02/20/18 10:35 PM
02/20/18 10:35 PM
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Benton, IL.
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Good luck getting a converter that tight with a 500" BB.

I have had 2 PTCs behind my 540 Hemi. They would flash to over 4,000 with 3.91 gears. I had asked for as tight a converter as they could make for the same reasons the OP wanted a tight converter.

The car just felt "spongey" down low driving around. PTC said that they would try to tighten it up one more time, but didn't think they could get it much ,if any, tighter. Actually, they said send it back a third time and they would see what they could do.

Oh, and did I mention that the engine vibrated around 2,000 RPM when I got it back the second time?

So I called Lenny at Ultimate. He told me that the problem was the 9.5" cores just aren't big enough to hold our torque monsters. And that there aren't any of the good old 11" cores around much anymore.

But I sent Lenny my PTC converter anyway. He did as much as he could with it and suggested some other changes I could make on my end. It still flashes to 3,800, but is noticeably tighter and more responsive down low. And the 2,000 RPM vibration is gone.

P.S. I have several of the huge motor home converters laying around, but he said that he can't get any of the internals that he would need for them.


Master, again and still
Re: Gearing a street/strip 500" BB [Re: topside] #2454839
02/20/18 11:24 PM
02/20/18 11:24 PM
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Bend,OR USA
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Originally Posted By topside
Has a PTC 9.5" converter, I should call them and see what they spec'd for the car.

Talk to them before deciding on which gear ratio, I tried from 3:73 to 4:30 in my old pump gas Duster with a custom built 10 inch Contintental converter for that motor, 517 C.I., 612 HP at 5500 RPM with the low deck six pack with 440 six pack carbs.
That stupid car ran within .03 ET, high 10.40 E.T. in the 1/4 mile,and very near the exact same MPH in the 1/4 mile with the 315x60x15 M/T ET Street radials using all four rear gear ratios, 3:73,3:91,4:10 and 4:30 confused work shruggy
My message is those long stroke motors with small stock like heads on pump gas make so much torque and HP you may be very happy with 2.76 to 3.23 gears in the rear work
I ended up using 4.10 after I bent the 8 3/4 housing bad enough to need replacing, I used a truck Dana 60 and had it cut down to replace the 8 3/4, no more problems after that devil thumbs

Last edited by Cab_Burge; 02/21/18 04:17 PM.

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Re: Gearing a street/strip 500" BB [Re: Cab_Burge] #2454868
02/21/18 12:16 AM
02/21/18 12:16 AM
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What might work well depends on the engine combo, especially cam. If the cam is in the 240 range (intake duration @.050") it should handle 3.23 gears just fine. Can't help on the converter to go with it... I run a manual.

Re: Gearing a street/strip 500" BB [Re: topside] #2454942
02/21/18 03:49 AM
02/21/18 03:49 AM
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This thing has Indy EZ-1s, matching single-plane, and hyd roller 236/241 @ .050 with .541/.544 lift. But the more I read & think about this, it seems like a lot of stall & gear in the car for 512".
I'm thinking 11" with around 2400 stall & 3.55s with the 30" tires. Called PTC but they weren't able to nail down any info beyond what I already "know" about this 9.5/3500.

I know of a guy with a Challenger in full street trim, pretty mild 505/727, 3.23s & 28" tire that runs 11.50s at about sea level (Sears Point), doesn't even shift the thing manually. Don't know what converter's in it but I'm gonna ask.

Re: Gearing a street/strip 500" BB [Re: topside] #2454984
02/21/18 09:08 AM
02/21/18 09:08 AM
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Tennessee
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I bought a Hugh's 11" rated at 3,000 stall when I installed the Gear Vendor overdrive in my Coronet. Car weighs 4,175lb, 3.54 gear with 275 15 Nitto Drag Radials. The 540 HEMI has a 248/254 @ .050 solid roller. It would blow right through the converter, and felt mushy on the freeway in overdrive. I sent it to PTC and asked them to make it as tight as possible. It is much improved. The rpm will climb 300 on a long interstate hill @ 75 mph. Flat and level a true 75 mph is 2,500 rpm.

Re: Gearing a street/strip 500" BB [Re: topside] #2455284
02/21/18 09:17 PM
02/21/18 09:17 PM
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Originally Posted By topside
This thing has Indy EZ-1s, matching single-plane, and hyd roller 236/241 @ .050 with .541/.544 lift. But the more I read & think about this, it seems like a lot of stall & gear in the car for 512".
I'm thinking 11" with around 2400 stall & 3.55s with the 30" tires. Called PTC but they weren't able to nail down any info beyond what I already "know" about this 9.5/3500.

I know of a guy with a Challenger in full street trim, pretty mild 505/727, 3.23s & 28" tire that runs 11.50s at about sea level (Sears Point), doesn't even shift the thing manually. Don't know what converter's in it but I'm gonna ask.


I think you are right. I bet the engine starts to wake up in the low 2000 RPM range... should be a very torque combo. 3.23 and a true 2400 stall would drive well I bet. I run a 496 with 243@.050 intake duration cam, 3.23 and manual transmission. The engine feels very strong as I get above 2000 RPM in any gear including overdrive... and I can always drop down a gear or two if I want to fly.

Re: Gearing a street/strip 500" BB [Re: Hemi ragtop] #2455320
02/21/18 10:35 PM
02/21/18 10:35 PM
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Dandridge TN
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I had a PTC 11 inch 2200 stall behind the 511 in my 69 Supper Bee with a GV and 3.54 gear. I built the engine for low end torque, if memory is correct I believe the cam lift was in the .456 range. Sold the car in 2015 so can’t check the cam card to be sure. This is what Ken at PTC recommended based on my build specs and it worked great with all the the low end torque the 511 made. The car weighed just under 4,000 pounds. AC, PS, PB car with bucket seats.

Re: Gearing a street/strip 500" BB [Re: topside] #2455328
02/21/18 10:48 PM
02/21/18 10:48 PM
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eastern,Ky
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That must suck to have these awesome big inch motors and can’t evem enjoy them on the street. That would be sad if a lonely little 446 would bust a stroker on the street because of the tall gears and big tall tires lol. Wait a minute, I’ve seen it before lol.

Re: Gearing a street/strip 500" BB [Re: 70RT Charger] #2455742
02/22/18 06:35 PM
02/22/18 06:35 PM
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Akron, Ohio
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Originally Posted By 70RT Charger
That must suck to have these awesome big inch motors and can’t evem enjoy them on the street. That would be sad if a lonely little 446 would bust a stroker on the street because of the tall gears and big tall tires lol. Wait a minute, I’ve seen it before lol.


It's pretty obvious these combos mentioned above were built for the street, hence the highway gearing. Just because they're trying to make their converter more efficient doesn't mean they won't currently lay some smack down.



Topside, I've been extremely happy with my combo. It's 500" with the MP 557 lift cam, 9.5" Dynamic converter as KillerBee mentioned, 275/60(28") tire, and 3.23 gears. I can drive this car all day long and cruise down the highway at 2800 RPM or less.
I drove it to the track, went 1.51 60 foot, 10.69 at 124.65, and drove it back home smiling ear to ear. That's with zero tuning.

The converter is slipping 17.5% down the track, which is a lot to me, but a couple experts have told me that it is being caused by the 3.23 gears so I'm afraid to mess with it. A modern high dollar converter might flash better and be more efficient(more MPH) but it sure would suck to spend all that money and gain little or nothing.

I am very tempted to try a 2.94 gear with a 26" tall radial at the track, and use the 28" tires for the street/highway. That should net the same ET's and be even more highway friendly.
I know it's personal preference, but I can't handle 3500RPM's on the highway like a lot of guys can.


1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
Re: Gearing a street/strip 500" BB [Re: topside] #2455790
02/22/18 08:23 PM
02/22/18 08:23 PM
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Thanks, ProSport. I'm not sure of this PTC 9.5's efficiency; car's been trapped in my shop due to winter, haven't driven it in a couple months. Yeah, the taller the gear, the less "leverage" so to speak, so the slippage & stall increase. Similar logic applies to shorter tires' grip vs input torque at the hit.
Funny thing is, my old 438" Hemi 4-speed car with 4.10s & 28" tire was happiest at & above 3500 and it didn't bug me to run it that way; it was like a ginormous SBC in that respect. I spun it to 7500. But in my mind, once the stroke hits 4", one can take advantage of the torque available at lower RPM. I think it'll last longer as well.
70RT: I've done a couple of 446s, one pretty stout & edgy on the street. My real racecar is a low-10s ex-SS/IA SB Duster. Of the 5 cars & 2 trucks currently, every one has a job, and this car's job is to drive to the track & have fun and be a bit more carefree.
I appreciate the info & comparisons so far, thanks!

Re: Gearing a street/strip 500" BB [Re: topside] #2455888
02/22/18 11:39 PM
02/22/18 11:39 PM
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Wichita
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11" 2800 rated stall here. 3.54 gears in the Dana.

That combo works perfect with my 505" stroker!


'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.

Re: Gearing a street/strip 500" BB [Re: GY3] #2455890
02/22/18 11:47 PM
02/22/18 11:47 PM
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Akron, Ohio
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Originally Posted By GY3
11" 2800 rated stall here. 3.54 gears in the Dana.

That combo works perfect with my 505" stroker!


Gotta love that torque cool up


1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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