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Engine RPM at Highway speeds?


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This question is for the automatic guy's. What engine RPM are you running at 70mph? assuming stock 4:56 gears and ...



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Old 12-18-2018, 11:09 AM
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Engine RPM at Highway speeds?

This question is for the automatic guy's. What engine RPM are you running at 70mph? assuming stock 4:56 gears and 305/40/22 tires. Thanks...

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Old 12-18-2018, 03:57 PM
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2150 (O/D, converter locked)

In other words, as slow as it's going to turn at 70 mph.
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Last edited by rottenronnie; 12-18-2018 at 04:30 PM.
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Old 12-19-2018, 09:26 AM
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I'l have to slow down to 70 and look.
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Old 12-19-2018, 06:45 PM
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I know you got an answer already Tincup but is a 6-speed swap out of the realm of possibilities? Lower RPM and turns the QC into much more of a beast
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Old 12-20-2018, 09:06 AM
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Thanks everyone, That's perfect, I was hoping to be around 2100rpm, all the online calculators say it should be around 2400rpm. I was considering changing to 4:10's.
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Old 12-20-2018, 09:44 AM
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2100 from my QC yesterday
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Old 12-20-2018, 10:37 AM
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Quote:
Originally Posted by Tincup View Post
Thanks everyone, That's perfect, I was hoping to be around 2100rpm, all the online calculators say it should be around 2400rpm. I was considering changing to 4:10's.
Personally I would only do that if you had some good power adders. Otherwise you'll increase the heavy pig feel
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Old 12-20-2018, 12:29 PM
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If you want to greatly reduce that heavy pig feel, buy a good converter it makes a world of difference for general driving around.

2150 (or so) isn't a lot of rpm for a performance-style camshaft so if you have one and are considering slowing your engine down, throttle response and gas mileage can take a hit.

It depends on how big a cam and how much you want to slow it down and/or if you care about that stuff.

Cheers and Merry Christmas (or whatever you prefer for holiday greetings)
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__________________
2005 QC N.A.
624 Wheel HP x 1.27 = 800-'ish flywheel (?)
Fully-Built 11:1 Pump-Gas
15.0 L/100 km. or 15.68 U.S. Miles Per Gallon
5600 pounds
[email protected] MPH in "D" for Drive

No Power Adders
Full B&B Exhaust with (4) Cats
Unported Street-Striker Heads w Custom Roller
Unported O.E.M. Intake Manifold
FSTJACK Hand-Ported TB
MONSTER R/X Dual-Vacuum Catch-Can
A fully-built 48RE transmission that actually keeps working!
Tuned by Maestro Chris Jensen

Last edited by rottenronnie; 12-20-2018 at 12:48 PM.
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Old 12-21-2018, 09:18 AM
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Here is a pic of my truck, should weigh in just over 4000lbs, so It shouldn't feel like a heavy pig.

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Old 12-21-2018, 10:03 AM
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It will be lighter than the stock trucks....
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#993 04 blk RC 4.56 gears,Harland Sharp Rockers,3/8" Hardened Pushrods, PSI Valve Springs,,Striker Valve Cover Spacers, JMB catless mids,Magnaflow Catback, Torries' Tune,B&M Shifter,Stinker's Extreme Lowering Kit, Caltracs,Catchcan, Forged Wiseco Pistons,Molnar Rods, Clevite Bearings.Center Force Clutch,Cometics Head Gaskets,ARP Head Studs , Pioneer X950BH Double Din , Grants Steering Wheel , Bronze shifter bushing, Bronze pads, Billet Keys in the T56 . And the list continues......
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