You have to love to drive it! - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OrrieG · 08-04-2014, 01:26 PM

Quote:

Originally Posted by Malice

I'm am having a hard time trying to find what the ideal rpm range is for that motor. I'm guessing 1800-2000? I'd love a 4 sec 0-60 but I'd also like to see about the ideal range for fuel economy. I'm not looking fastest drag car or a Prius. This will be a daily driver but I was hoping through others experience to find out what they have done and maybe help make a decision of what to do with this truck.

Here is a stock ls2 hp torque curve. Looks like torque is relatively flat between 300 ft# at 2k to 340 ft# max at 4.5K. blue is ls2 red is ls6

Malice · 08-04-2014, 05:48 PM

Yeah that dyno help. I think a 4.10 Gear would actually be fine. I found a truck which I like the ride height and tire size so I am going to try and match it. Tired were a 29.65" tall tire. What do you guys think. I like how they ratios work out and I love how the truck looks.

OrrieG · 08-04-2014, 06:55 PM

Looks dialed in to me.

Malice · 08-05-2014, 01:40 PM

My only concern was with a supercharger and 550 - 600hp is that going to be too short of a first gear but.... i'm thinking i'll be fine.

Speedbumpauto · 08-05-2014, 01:53 PM

I liked the .74 ratio of 5th gear on the one trans you showed. Might make for a sweeter downshift passing gear than the .84 5th gear.

Malice · 08-05-2014, 03:35 PM

Quote:

Originally Posted by Speedbumpauto

I liked the .74 ratio of 5th gear on the one trans you showed. Might make for a sweeter downshift passing gear than the .84 5th gear.

That was a corvette transmission and gear ratio. I was showing that for an example of it's gear ratio/speed. I am assuming where the vette is more aero dynamic it would be better to get a shorter rear end gear because it will need more torque in comparison to the much smaller vette.

That was the thought.

I just thought the 3.89 where it was a little taller gear. I'd be doing 1600 rpm at 65mph. For that motor I feel like it might be a little low. There is only about 125 rpms different between the 4.10 and 3.89 but I don't want to this once right!

I'm feeling pretty confident with the 4.10. Unless someone wants to come and tell me different. I think we are sitting pretty good.

08-04-2014, 05:48 PM	#27
Malice Registered User Join Date: Jun 2013 Location: Burley Posts: 90	Re: You have to love to drive it! Yeah that dyno help. I think a 4.10 Gear would actually be fine. I found a truck which I like the ride height and tire size so I am going to try and match it. Tired were a 29.65" tall tire. What do you guys think. I like how they ratios work out and I love how the truck looks. Attached Images

08-04-2014, 06:55 PM	#28
OrrieG Registered User Join Date: Jun 2006 Location: Idaho Posts: 8,800	Re: You have to love to drive it! Looks dialed in to me. __________________ 1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project

08-05-2014, 01:40 PM	#29
Malice Registered User Join Date: Jun 2013 Location: Burley Posts: 90	Re: You have to love to drive it! My only concern was with a supercharger and 550 - 600hp is that going to be too short of a first gear but.... i'm thinking i'll be fine.

08-05-2014, 01:53 PM	#30
Speedbumpauto Registered User Join Date: Aug 2011 Location: Tucson, AZ Posts: 917	Re: You have to love to drive it! I liked the .74 ratio of 5th gear on the one trans you showed. Might make for a sweeter downshift passing gear than the .84 5th gear.



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