Page 1 of 3 123 LastLast
Results 1 to 20 of 44
Like Tree1Likes

Cruising RPMs

This is a discussion on Cruising RPMs within the General Help forums, part of the LSx Technical Help Section category; Hi everyone, nooby here. Planning on an LS swap and I want to cover all the bases since this is ...

  1. #1
    Junior Member
    Join Date
    Sep 2017
    Location
    Durham, CA
    Posts
    24

    Blue
    05 Camaro

    Cruising RPMs

    Hi everyone, nooby here. Planning on an LS swap and I want to cover all the bases since this is not going in performance car. I am curious what the stock car cruising rpms are at 65 mph. I know it is fairly low. One reason for the LS swap is I am after not only performance but milage too. Worked out OK when I went with a 4.3L V6 at the time over a 350, but now that engine is completely worn out. I do have a 4L60E in it now and to my knowledge a LS1 will bolt to it and then get the right ECM. This is a ground up project and I want to get the right gearing.

  2. #2
    Junior Member
    Join Date
    Oct 2016
    Location
    Roseville, ca
    Posts
    36
    Quote Originally Posted by 362cuinxh View Post
    Hi everyone, nooby here. Planning on an LS swap and I want to cover all the bases since this is not going in performance car. I am curious what the stock car cruising rpms are at 65 mph. I know it is fairly low. One reason for the LS swap is I am after not only performance but milage too. Worked out OK when I went with a 4.3L V6 at the time over a 350, but now that engine is completely worn out. I do have a 4L60E in it now and to my knowledge a LS1 will bolt to it and then get the right ECM. This is a ground up project and I want to get the right gearing.
    My 02 ws6 cruises at about 2000 at 65. Maybe a little less. I don't drive 65 that often....ls1 with the same trans and a 2500 stall.



    Sent from my iPhone using Tapatalk

  3. #3
    Junior Member
    Join Date
    Sep 2017
    Location
    Durham, CA
    Posts
    24

    Blue
    05 Camaro

    I guess that brings up another question: What is the stall speed on a torque converter behind a LS1? My current stall speed is around 1800 rpms

  4. #4
    Junior Member
    Join Date
    Oct 2016
    Location
    Roseville, ca
    Posts
    36
    Quote Originally Posted by 362cuinxh View Post
    I guess that brings up another question: What is the stall speed on a torque converter behind a LS1? My current stall speed is around 1800 rpms
    I think it's 15 -1800.


    Sent from my iPhone using Tapatalk

  5. #5
    Junior Member
    Join Date
    Sep 2017
    Location
    Durham, CA
    Posts
    24

    Blue
    05 Camaro

    Well, might be able to use my current lock up converter then. I kind of wish it had a lower stall speed though

  6. #6
    Junior Member
    Join Date
    Oct 2016
    Location
    Roseville, ca
    Posts
    36
    Quote Originally Posted by 362cuinxh View Post
    Well, might be able to use my current lock up converter then. I kind of wish it had a lower stall speed though
    I would Google it, I'm not a 100 percent sure.


    Sent from my iPhone using Tapatalk

  7. #7
    Junior Member
    Join Date
    Sep 2017
    Location
    Durham, CA
    Posts
    24

    Blue
    05 Camaro

    I did giggle it, and I get a range of answers. But most are in the 1800 rpm range. But it doesn't hurt to check on that. The answers all came off forums, so there is a chance of error. Just checking if anyone knows for sure

  8. #8
    Member
    Join Date
    Jun 2008
    Location
    Euclid,ohio
    Posts
    174

    Black
    1998 Z28

    98-02 LS1 OEM convertors are 1800 stall rated and have lock-up capabilities. If GM thought a lower stall RPM rating would be better,they would have gone that route AND I agree.
    Automatics came with 2.73s' or 3.23s' rear end gearing,mine is 3.23. Torque convertor lock-up occurs(when the computer allows it),typically,at 35-40 mph. When I'm 'cruising' at that speed and the convertor locks,rpm drops to about 1200 and the engine starts 'lugging',not a good situation for the engine.
    When I had a TCI 2800 and with my current Yank SS3600,lock-up at the mph didn't change as lock-up and stall rating are two different and independent things.
    When I was running the TCI 2800 and Yank SS3600 with 4.56 rear end gears,still lock-up mph was not affected/changed. But with the 4.56s','lugging' was diminished as the drivetrain had a better mechanical advantage over the resistance/weight of the vehicle.
    MPG with 3.23s' for many trips from Ohio to Florida was consistently 24.5 at legal freeway speeds,mpg with 4.56s' for 4 trips from Ohio to Florida was consistently 21.5 at freeway legal speeds. On one trip with the 4.56s' returning to Ohio on I26 across South Carolina,I hooked up with a fast moving group of cars and was in cruise control at 4000rpm for about an hour.
    Black 98Z A4 ,Yank SS3600 convertor,:SLP driveshaft loop,STB,PHB,LCAs,'flow-pac CAI,SFC,take-off 17x9 SS rims;StainlessWorks 'Y' & chambered exhaust,BMR LCA Relos,QA1s DblAdj-rear,Kenny Brown 6 Pt bolt-in cage,VGX pads

  9. #9
    Senior Member Whamhammer's Avatar
    Join Date
    Sep 2010
    Location
    Bel Air, Maryland
    Posts
    1,307

    Silver
    '02 Trans Am WS-6, 6M

    Quote Originally Posted by 362cuinxh View Post
    Hi everyone, nooby here. Planning on an LS swap and I want to cover all the bases since this is not going in performance car. I am curious what the stock car cruising rpms are at 65 mph. I know it is fairly low. One reason for the LS swap is I am after not only performance but milage too. Worked out OK when I went with a 4.3L V6 at the time over a 350, but now that engine is completely worn out. I do have a 4L60E in it now and to my knowledge a LS1 will bolt to it and then get the right ECM. This is a ground up project and I want to get the right gearing.
    What car is this for? Your info says that you have an '05 Camaro?

    What the guys are telling you would only be correct for your car if you had the same axle ratio and just shy of a 26" tire, if either of those are different it will be higher or lower, dependent on the percentage of overall change.
    SLP Air Lid/Smooth Bellows
    Kooks Emissions LT Headers/Catted Y pipe
    NGK TR55 plugs
    Magnaflow Cat-back
    Spohn Front Upper Tubular Control Arms
    UMI Front Lower Tubular Control Arms
    UMI Rear Lower Control Arms/ Adjustable Panhard Rod
    Factory C5 Z06 17x9.5 wheels w/ 285-40-17 Continental Extreme Contact DW's all the way around.
    Dyno Dynamics dynoed @:
    356 rwhp, 360 rwlb/tq

  10. #10
    Junior Member
    Join Date
    Sep 2017
    Location
    Durham, CA
    Posts
    24

    Blue
    05 Camaro

    OK, small confession. I don't have a Camaro. I had a helluva time registering on here, so I put Camaro in the spot. What I have is an 86 Jeep Cherokee that has had a Chevy transplant and due for an update again. This time around will leave only the body as an original Jeep part. That being said, the Jeep will see lots of long distance driving as well as daily driving use. I don't need low diff gears since I have unbelievable crawling gears already. What I am looking for is good milage on those long distance trips. I have a 31 gal tank for that already and I want to be able to afford to fill it. I talked to a guy from the local hot rod shop and he told me to expect 20 - 22 mpg That would be nice. That is what I started with when it had a 2.8L V6. More than that would be even better

  11. #11
    Spaz is My Mentor SMWS6TA's Avatar
    Join Date
    Feb 2009
    Location
    Ugy Lower Corner of AL
    Posts
    10,434

    Navy Blue Metallic
    98 T/A w/a little mods...

    mpg is effected by more than GR of the rear and engine size.

    Tire size and wheel weight factors in too. Now with low gears and tall tires you may not be effected in mpg as you would with high gears and tall tires. There are gear ratio calculators to help you figure out what rpm you will be at and vice versa.



    Most LS1's with T56's or 4L60E transmissions get on average 20-26 mpg, M6's with a light foot in rpms and staying on interstate at 70 mpg you could get as high as 27mpg.

    Now that is all with it all being stock in parts and tune.


    Having a LS1 in a Jeep is nothing to be embarrassed about, hell some of us think it's pretty damn cool. No purest snobs on here.
    http://www.ls1.com/forums/f7/my-6-liter-build-174257/

    http://www.ls1.com/forums/f8/my-8-8-rear-build-165553/

    6.0L Block - Forged 403 built, breaking it in , Polluter Stg3 Cam, FAST 102mm Intake, NW102 TB, MSD wires, NGK TR6 plugs, Truck Coil Packs, LS3 Fuel Injectors, CC Pacesetter LT Headers, TS&P ORY, QTP e-Cutout, Magnaflow Muffler, 104mm Air Lid & Line Lock, Catch Can, Stage 2 T56 w/Viper shaft, PRO 5.0 Shifter, Tick MC, Monster Stg 4 Clutch, QT SFI BH, MWC DSL, UMI: SFC, PHB, LCA's, LCA Relocation Brackets & TA, Hotchkis Springs (1" Drop), YR1 Snowflake Wheels wrapped in NT555 tires & Custom Fab Ford 8.8 rear w/4.10 Yukon Gears, WSQ Hood, 3"CM Strange Eng Drive Shaft.

    Horsepower never lies, but is often lied about!

  12. #12
    Junior Member
    Join Date
    Sep 2017
    Location
    Durham, CA
    Posts
    24

    Blue
    05 Camaro

    Thanks. I understand about calculating for gears. Been doing gears for a long time. And tire weight affecting milage too. But that is mostly around town where acceleration is a factor. What I am interested in is a target RPM. Right now I am at about 2200 rpm at cruising speed. However there will be an increase in tire size bla bla bla. Also, as I understand it, these engines were designed to be able to have a decent amount of torque at low rpm to achieve better milage, at least on paper for the CAFE boys

  13. #13
    Spaz is My Mentor SMWS6TA's Avatar
    Join Date
    Feb 2009
    Location
    Ugy Lower Corner of AL
    Posts
    10,434

    Navy Blue Metallic
    98 T/A w/a little mods...

    My setup is a 403ci, T56, 8.8 rear with 411 gears on 275/45/R17 Nitto tires.

    1st is almost a joke as well as mpg now. I'm lucky to get 18-20 mpg on Interstate on long trips. In town....well I didn't build it to be mpg economical.


    On interstate in 6th gear at 70mph my rpms are around 1900, at 80mph (my usual cruising speed) it's around 2300.

    But I'm not know for having a light foot on the gas pedal either.

  14. #14
    Junior Member
    Join Date
    Sep 2017
    Location
    Durham, CA
    Posts
    24

    Blue
    05 Camaro

    That is helpful. I understand the T56 has a pretty tall overdrive. My current overdrive ratio in the 4L60E is 30%, which is pretty tall in comparison to other Jeep overdrives of around 14% in the Auto. Will keep this tranny, I beefed it up and it has never had anything except Redline synthetic in it. Aux thermostatically controlled fan mounted on the cooler in the hood too

  15. #15
    Spaz is My Mentor SMWS6TA's Avatar
    Join Date
    Feb 2009
    Location
    Ugy Lower Corner of AL
    Posts
    10,434

    Navy Blue Metallic
    98 T/A w/a little mods...

    There's some issues with the 4L60e. They don't handle high torque loads well. Either it's 2nd or 3rd gear that prematurely seems to go out on them. The stock cooler configuration that comes on the f body has it running thru the radiator IIRC, most get an aftermarket cooler and reroute it thru that and have better cooling temps for the tranny.

  16. #16
    Junior Member
    Join Date
    Sep 2017
    Location
    Durham, CA
    Posts
    24

    Blue
    05 Camaro

    There are more issues than the 2nd gear. Can't remember the name of it, but there is a crown shaped thing that holds two of the planetaries in the rear. That and the tail shaft have been upgraded. Also kevlar band and clutch packages. In theory at least it is stronger. Also, tstat on the cooler fan is at 160. I haven't ruled out the possibility of a 4L65E with the extra clutch disc in 2nd gear. All my good parts will swap over

  17. #17
    Junior Member
    Join Date
    Sep 2017
    Location
    Durham, CA
    Posts
    24

    Blue
    05 Camaro

    That reminds me, let me pic your brain a little more. There are LS2s available for the same price. More HP. Like I say sometimes, HP is like sex. More is better and too much is just right So my question is, does the LS2 have the same bell housing as the LS1?

  18. #18
    Spaz is My Mentor SMWS6TA's Avatar
    Join Date
    Feb 2009
    Location
    Ugy Lower Corner of AL
    Posts
    10,434

    Navy Blue Metallic
    98 T/A w/a little mods...

    Yes. If you want a easier block to get a hold of look for 5.3's (there's a ton out there, but make sure it's a 5.3 and not a 4.8). However for me the best block to get is a 6 liter LQ4 or 9 from 99-04 yrs. Pre 99 have the LT1 crank (different length then LS crank by about an inch) and 05< have 58x reluctor wheels so you will either need to get a convertor box ($$$$$) or get a 24x reluctor wheel and have it pressed on by a shop. It is far cheaper then the convertor box.

    GEN III and IV engines share the same structure so most parts are able to be used on both.

    My reasons I favor the LQ4/9 6 liter blocks are many; they handle more hp, N20 and boost over aluminum, they can be bored out more over aluminum, you can use LS3 heads and intakes, the starter mount doesn't break off like some LS1's have had done. Only negatives I found are they are heavier and you will either need to drill and tap a hole for the alternator or do like me and relocate it to the passenger head like turbo guys do.

  19. #19
    Junior Member
    Join Date
    Sep 2017
    Location
    Durham, CA
    Posts
    24

    Blue
    05 Camaro

    That is useful info. One of the reasons I wanted to go to the LSX is the aluminum block. Weight is an issue off road as well as for the street. The fact is, I have added weight and will add more when I change axles to accommodate the LS. With armor and stuff it is easy to have a 5000# Jeep. Something I am trying to avoid. For instance, I built my bumpers out of aluminum. Front winch bumper and skid for instance is only about 65#. There will be more Al stuff added in place of steel. The goal is to stay below 4000#, not easy to do. Whatever I do, the motor will probably stay stock. Let's face reality, a rock crawling suspension rides nice on the street and off road, but is not a good candidate for excessive HP. However I have some tricky upgrades to compensate somewhat for that. Have done one already. Think about the potential for wheel stands with a soft suspension with 14" of travel. Might be fun a couple of times, but it would get old fast.

  20. #20
    Spaz is My Mentor SMWS6TA's Avatar
    Join Date
    Feb 2009
    Location
    Ugy Lower Corner of AL
    Posts
    10,434

    Navy Blue Metallic
    98 T/A w/a little mods...

    Then I suggest a 5.3 for your build. They have plenty of power and torque for what your looking to do. Most are aluminum but there are a few iron blocks out there.

    While the LS2 will have more power potential it's IMHO not worth the added cost over the 5.3.

Page 1 of 3 123 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Did a lil cruising
    By GTP231 in forum Member's Rides
    Replies: 0
    Last Post: 10-03-2009, 06:48 PM
  2. Question: Cruising the Coast 08?
    By 99'CajunFirehawk157 in forum Southern Members
    Replies: 3
    Last Post: 11-11-2008, 10:31 AM
  3. cruising in nuetral
    By robcas47 in forum Automatic Transmission
    Replies: 1
    Last Post: 08-03-2008, 11:25 PM
  4. For those of you not cruising on Sunday...
    By MaverickWH in forum Rocky Mountain Members
    Replies: 2
    Last Post: 05-13-2007, 06:10 PM
  5. Best Shocks for cruising????
    By mrbob2 in forum Camaro / SS
    Replies: 2
    Last Post: 10-20-2006, 08:55 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •