Gear ratio and Tire size - Competition Diesel.Com

SEOHPowerstroke · 11-18-2007, 10:46 PM

I was wondering what you guys thought about gear ratios and tire sizes.

My friend is building a motor that should rev around 5000 rpm. He just bought new rear ends, and was wondering what gears he should use. He is currently running 35's but considering running 33's for wheel speed. However this motor should be cranking around 1200hp and he doesn't think wheel speed will be a problem anymore.

Also what are the best tires to run on 16x10's?

Thanks in advance.

SEOHPowerstroke · 11-20-2007, 07:15 PM

No one have

on this subject or what?

*Bobcat698* · 11-20-2007, 08:06 PM

What is the engine/trans combo?

mech2161 · 11-20-2007, 08:55 PM

What class?

SEOHPowerstroke · 11-20-2007, 11:52 PM

CR with an NV4500. Pro Stock class.

joeservo · 11-21-2007, 12:13 AM

[QUOTE=SEOHPowerstroke]My friend is building a motor that should rev around 5000 rpm. QUOTE]

a common rail? did he tell you it would rev that high? tell him he is full of it.

SEOHPowerstroke · 11-21-2007, 12:27 AM

[QUOTE=joeservo]

Quote:

Originally Posted by SEOHPowerstroke

My friend is building a motor that should rev around 5000 rpm. QUOTE]

a common rail? did he tell you it would rev that high? tell him he is full of it.

Just trust me, it will rev that high, maybe more. Look for it at the TS event, maybe earlier. We just need to know what gears would be the best to run, so it is ready to go on the first hook. He's probably gonna stick with the 35's unless you guys think that is crazy.

Thanks

oldschoolPSD · 11-21-2007, 12:29 AM

So you an make a CR rev 5000rpms when no one else can but you don't know what gears to run?

SEOHPowerstroke · 11-21-2007, 12:41 AM

Quote:

Originally Posted by oldschoolPSD

So you an make a CR rev 5000rpms when no one else can but you don't know what gears to run?

Sad, but true. I can't make it rev that, but I know someone who can and is going to make this motor do it. And sadly enough that guy has no answer for us either. Go figure.

XLR8R · 11-21-2007, 07:20 PM

Yes, you can run a HPCR pretty close to 5 grand - just witnessed it again recently... reliability suffers a bit, though.

2wpuller · 11-21-2007, 09:30 PM

http://www.4lo.com/calc/gearratio.htm
THis work real well for me
Dale

Tcolesanti · 11-21-2007, 11:58 PM

I use this one: http://www.public.asu.edu/~grover/willys/speed.html

*Sledpuller* · 11-22-2007, 07:36 AM

Go with a 5:00 or lower, so you can pull 4th gear in the 4500 5spd.
Do a search on tires in this forum, there is detailed threads about them.

zstroken · 11-22-2007, 08:09 AM

I would suggest 4.88's then you can fine tune with tires to either increase or decrease.

Tcolesanti · 11-22-2007, 08:52 AM

Quote:

Originally Posted by Sledpuller

Go with a 5:00 or lower, so you can pull 4th gear in the 4500 5spd.
Do a search on tires in this forum, there is detailed threads about them.

Screw that, turn the motor harder.

-Tom

*Sledpuller* · 11-22-2007, 01:11 PM

Do you mean tune or turn?

Hes already talking 5000 rpm, Tom. How much harder do you want him to turn it.

4th gear in the 4500, direct is the strongest gear you have. However-35s with a NV 4500-4th low is too much gear with 4:10s and 3rd low is a loser gear.

3rd low will keep you in the ball park, 35s and 3:54s, but you will need every bit of the 5000 rpm.(And it is weaker than 4th.)

Forget the high side of the transfer case.

4:88s may be enough.

Tcolesanti · 11-22-2007, 02:40 PM

5.38's 2nd gear high range 5500+ rpm.

-Tom

*Sledpuller* · 11-22-2007, 04:45 PM

You turned 5500 at Vegas? DOWN the track?

zstroken · 11-22-2007, 05:39 PM

Using the low side of the transfercase is always easier on the tranny. I like the idea of the 1:1 on the transmission if it can give you the speeds you want. The 5.38's would be easier on the driveshaft and transfercase though.

CTD · 11-22-2007, 07:17 PM

Here's a good one....

gear chart

11-18-2007, 10:46 PM	#1
SEOHPowerstroke Name: SEOHPowerstroke Title: Project Developement Status: Not Here Join Date: Sep 2007 Location: Southeastern, OH Member`s Gallery Posts: 498	Gear ratio and Tire size I was wondering what you guys thought about gear ratios and tire sizes. My friend is building a motor that should rev around 5000 rpm. He just bought new rear ends, and was wondering what gears he should use. He is currently running 35's but considering running 33's for wheel speed. However this motor should be cranking around 1200hp and he doesn't think wheel speed will be a problem anymore. Also what are the best tires to run on 16x10's? Thanks in advance. __________________ 2009 GMC Sierra 3500 CC DRW dpf deleted, Transgo, FASS 150/200, Efi Live by Bob Olsen

11-20-2007, 07:15 PM	#2
SEOHPowerstroke Name: SEOHPowerstroke Title: Project Developement Status: Not Here Join Date: Sep 2007 Location: Southeastern, OH Member`s Gallery Posts: 498	No one have on this subject or what? __________________ 2009 GMC Sierra 3500 CC DRW dpf deleted, Transgo, FASS 150/200, Efi Live by Bob Olsen

11-20-2007, 08:06 PM	#3
Bobcat698 Name: Bobcat698 Title: Pure Diesel Power Status: Not Here Join Date: Apr 2006 Location: Marshfield, WI Member`s Gallery Posts: 2,229	What is the engine/trans combo? __________________ Pure Diesel Power 715-254-1833

11-20-2007, 08:55 PM	#4
mech2161 Name: mech2161 Title: I have a secret. Status: Not Here Join Date: Jan 2007 Location: Morgantown WV Member`s Gallery Posts: 3,986	What class? __________________ Kevin SLEDPULLMOTORSPORTS

11-20-2007, 11:52 PM	#5
SEOHPowerstroke Name: SEOHPowerstroke Title: Project Developement Status: Not Here Join Date: Sep 2007 Location: Southeastern, OH Member`s Gallery Posts: 498	CR with an NV4500. Pro Stock class. __________________ 2009 GMC Sierra 3500 CC DRW dpf deleted, Transgo, FASS 150/200, Efi Live by Bob Olsen

11-21-2007, 12:13 AM	#6
joeservo Name: joeservo Title: Diesel Enthusiast Status: Not Here Join Date: Apr 2006 Member`s Gallery Posts: 235	[QUOTE=SEOHPowerstroke]My friend is building a motor that should rev around 5000 rpm. QUOTE] a common rail? did he tell you it would rev that high? tell him he is full of it.

11-21-2007, 12:29 AM	#8
oldschoolPSD Name: oldschoolPSD Title: My Trucks are Obsolete Status: Not Here Join Date: Jul 2006 Location: Davidsonville, MD Member`s Gallery Posts: 891	So you an make a CR rev 5000rpms when no one else can but you don't know what gears to run? __________________ Sold the PSD Sold the First Gen On the prowl for a std cab dually to build a buck nasty welding truck

11-21-2007, 07:20 PM	#10
XLR8R Name: XLR8R Title: Crew Chief Status: Not Here Join Date: Sep 2007 Location: Pattonville, TX Member`s Gallery Posts: 2,364	Yes, you can run a HPCR pretty close to 5 grand - just witnessed it again recently... reliability suffers a bit, though. __________________ 3 Nails Garage Sleeps a flock of Rams & a Goat GUN-HAPPY Crew Chief

11-21-2007, 09:30 PM	#11
2wpuller Name: 2wpuller Title: letting the smoke fly Status: Not Here Join Date: Dec 2006 Location: Washington,Missouri Member`s Gallery Posts: 2,894	http://www.4lo.com/calc/gearratio.htm THis work real well for me Dale __________________ 1975 f250 6.0 Perkins,twins,2006,6sp allison 1972 C10,5.9 5sp 2007 Dodge 2 WD pulling truck Sponsors GoerendTransmission Haisley Machine MCS MidwestPerformanceDiesel ShowMePerformance Snow Performance

11-21-2007, 11:58 PM	#12
Tcolesanti Name: Tcolesanti Title: ALL NIGHTER Status: Not Here Join Date: Apr 2006 Location: Simi Valley, CA Member`s Gallery Posts: 2,753	I use this one: http://www.public.asu.edu/~grover/willys/speed.html __________________ 2000 Dodge 3.6 https://www.facebook.com/AllNighterMotorports

11-22-2007, 07:36 AM	#13
Sledpuller Name: Sledpuller Title: Comp Diesel Sponsor Status: Not Here Join Date: Apr 2006 Location: Pennsylvania Member`s Gallery Posts: 8,160	Go with a 5:00 or lower, so you can pull 4th gear in the 4500 5spd. Do a search on tires in this forum, there is detailed threads about them. __________________ DIESELmotorsports.us www.runnadm.com 99 V10 Cummins Amsoil sold here fairtax.org "I love it when a poser intellection drivels himself into oblivion.."Inimmo77"post Bish and quit staring at the fing screen"jponder

11-22-2007, 08:09 AM	#14
zstroken Name: zstroken Title: For $$$ your name here Status: Not Here Join Date: Sep 2006 Location: Western Michigan(by the lake) Member`s Gallery Posts: 23,151	I would suggest 4.88's then you can fine tune with tires to either increase or decrease.

11-22-2007, 01:11 PM	#16
Sledpuller Name: Sledpuller Title: Comp Diesel Sponsor Status: Not Here Join Date: Apr 2006 Location: Pennsylvania Member`s Gallery Posts: 8,160	Do you mean tune or turn? Hes already talking 5000 rpm, Tom. How much harder do you want him to turn it. 4th gear in the 4500, direct is the strongest gear you have. However-35s with a NV 4500-4th low is too much gear with 4:10s and 3rd low is a loser gear. 3rd low will keep you in the ball park, 35s and 3:54s, but you will need every bit of the 5000 rpm.(And it is weaker than 4th.) Forget the high side of the transfer case. 4:88s may be enough.

11-22-2007, 02:40 PM	#17
Tcolesanti Name: Tcolesanti Title: ALL NIGHTER Status: Not Here Join Date: Apr 2006 Location: Simi Valley, CA Member`s Gallery Posts: 2,753	5.38's 2nd gear high range 5500+ rpm. -Tom __________________ 2000 Dodge 3.6 https://www.facebook.com/AllNighterMotorports

11-22-2007, 04:45 PM	#18
Sledpuller Name: Sledpuller Title: Comp Diesel Sponsor Status: Not Here Join Date: Apr 2006 Location: Pennsylvania Member`s Gallery Posts: 8,160	You turned 5500 at Vegas? DOWN the track?

11-22-2007, 05:39 PM	#19
zstroken Name: zstroken Title: For $$$ your name here Status: Not Here Join Date: Sep 2006 Location: Western Michigan(by the lake) Member`s Gallery Posts: 23,151	Using the low side of the transfercase is always easier on the tranny. I like the idea of the 1:1 on the transmission if it can give you the speeds you want. The 5.38's would be easier on the driveshaft and transfercase though.

11-22-2007, 07:17 PM	#20
CTD Name: CTD Title: Rookie Status: Not Here Join Date: Aug 2006 Member`s Gallery Posts: 14	Here's a good one.... gear chart __________________ Doug President Turbo Diesels of New England 01 Dodge Ram 2500 QC SLT 4X4 4:10 LS. AutoMeter Gauges. SPS66. 6" stacks. Mystery switch, Edge Drag Comp. Mach 8s. ARP studs, o-ringed head. DTT trans. On the dyno 07/18/07...761HP 1272TQ Best ET to date....11.95@112.92mph