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what rpm range is appropriate for my '92 NA ej22? (in my 1981 4sp westy)

 

My ej25 runs 3200-3600 @ 70mph?

On Sun, Jul 7, 2024 at 09:27 OlRivrRat DeanB via <olrivrrat=[email protected]> wrote:
There is a 3.7mi stretch of I25 between ABQ & SantaFe known as

La Bajada (The Hill) that climbs 688ft & takes roughly 2.96min¡¯s @ 75mph

& with the OEM 3rd gear & 235/75r15 tires I ran on the rear of My 90Westy

the EJ2.5 has handled that quite nicely @ about 5400rpm possibly 100-200

times over the past 14years with many of those having Canoes on the roof &

or Raft Trailer in tow,,, Those times when VDubaru is Bare & Lightly loaded @

about 4400lbs & there happened to be little traffic I would push it to 82mph @

about 5900rpm ~ I now have 235/70r16s on the rear & do 75mph @ 5600 &

82mph @ 6100 ~

These little 4Bangers are actually quite happy @ High RPMs as long as

They are Properly Lubed & Cooled & Properly Built ~

A point to remember is that there is Less Friction between 2 surfaces

the faster they are moving relative to 1 another ~

There is, though, another daemon to keep in mind about Your Subi

powered Vanagon,,, When connected to a drivetrain, Revs/Min translate to

Revs/Mile & due to the higher Revs/Min We generally run Vanagons @, the

Subaru recommended 105000mi T¡¯Belt change interval should be reduced

to roughly 87000 miles on a Vanagon like Mine that has a taller 4th & Big

Tires on the rear,,, Those with OEM 4th & ¡°normal¡± sized rear tires should

change the T¡¯Belt @ Even Lower Milage & the amount of time spent driving

in lower gears also can reduce T¡¯Belt life even more ~

 

I think a LOT of this has to do with light load or heavy load.? With light load, Subi EJ22 laughs and smiles at 4200 RPM; with heavy load at same RPM...motor is not smiling anymore.
 

At 4200 rpm, the EJ22 is at its happiest under load. Just look at any dyno plot to see that¡¯s where it is making its peak torque. The more load, the better as it allows more throttle opening, i.e. less breathing restriction. With lower rpm at the same speeds, that means you would have taller gearing and less mechanical advantage so the engine would work harder at the same speeds all the while producing less torque at the wheels.
 

Good observations.? But I disagree for this one aspect:? Motor Longevity.? The reason I got an EJ22?? Modern metallurgy.? Modern electronics.? Ease of obtaining parts.? Modern cooling.? And of course the fun ones:? Better fuel economy, better power, knowledgeable mechanics in any state of USA.? So I drive like your grandma most of the time, I only punch it when I need to.? Mostly, I need this motor to last; has 75K, needs to go to 300K+.

On Monday, July 8, 2024 at 11:28:26 AM PDT, todd s via groups.io <tsorel1600@...> wrote:


At 4200 rpm, the EJ22 is at its happiest under load. Just look at any dyno plot to see that¡¯s where it is making its peak torque. The more load, the better as it allows more throttle opening, i.e. less breathing restriction. With lower rpm at the same speeds, that means you would have taller gearing and less mechanical advantage so the engine would work harder at the same speeds all the while producing less torque at the wheels.





 

????????? ? ? ? ?? JA

?????? Which gear are You talking about ~

Also, if You are seeing a 400rpm swing @ a Specific Speed You may have a Clutch or Torque Converter Issue ~

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