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Is 3900 rpms at 70 mph bad?

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Old Mar 16, 2004 | 03:38 AM
  #21  
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Originally Posted by fr130
Nope, still 3K@70mph as before. How about tire pressure? Recommended on stock steelies/tire is 29/30psi as per manual. I'll check my cold air pressure early tomorrow morning.

doesn't matter what your tire pressure is

doesnt matter if you have lego wheels or monster truck wheels.

when the speedo says 70mph the tach is gonna say 3500 if you have the 5speed.
Old Mar 16, 2004 | 03:56 AM
  #22  
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Originally Posted by jackmott
doesn't matter what your tire pressure is

doesnt matter if you have lego wheels or monster truck wheels.

when the speedo says 70mph the tach is gonna say 3500 if you have the 5speed.
*nod* Whether or not you're really going 70mph is another story...
Old Mar 30, 2004 | 01:38 AM
  #23  
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Default Re: Is 3900 rpms at 70 mph bad?

[quote="George"]
Originally Posted by OC Scion

The solution isn't all that cheap. The Echo final drive might fit and would lower engine RPM by about 25%. A partial solution is to fit larger diameter tires, which would lower engine RPM by about 10% max.

George
I am really interested in this Echo final drive. Do you think it would throw the ECU out of whack? :?:

Also, How "not cheap" are we talking here? 1000$? More?

Thanks
Old Mar 30, 2004 | 02:54 AM
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To get my stock automatic to 4000RPMs, I"ve gotta be pushing a solid 90+MPH
Old Mar 30, 2004 | 03:09 AM
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XB Automatic... im around 3200-3400 rpms at 80 mph
Old Mar 30, 2004 | 12:23 PM
  #26  
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xb auto, 3000 RPM @ 70.
Old Mar 30, 2004 | 04:23 PM
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Default Re: Is 3900 rpms at 70 mph bad?

Originally Posted by George
The solution isn't all that cheap. The Echo final drive might fit and would lower engine RPM by about 25%. A partial solution is to fit larger diameter tires, which would lower engine RPM by about 10% max.

George
The echo final drive might fit, but really you would need to talk to a tranny specialist to remove the guts of the tranny and replace the gears/final drive. Having less teeth on the gears will cause the RPMs to come down and thus making our vehicles last longer, I have been researching this for a while, since my brother shop is Precision Transmissions. After the main warranty goes out I am removing the tranny and replacing all the gears and final drive.

Find out more about trannys at www.precisiontranmissions.com just click on the FAQ area.
Old Mar 30, 2004 | 05:28 PM
  #28  
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Anyone able to inform me as to how the xB runs at near 100? Due to my large 15 size feet they weigh more you see,...so the pedal is pushed farther down . Actually I can't stand anything less than 90 on the freeway. Around towning is always 50-60 unless school zone...I'm not a complete pyscho. Tee hee.
Old Mar 30, 2004 | 06:37 PM
  #29  
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Originally Posted by xtremeOrange
Anyone able to inform me as to how the xB runs at near 100? Due to my large 15 size feet they weigh more you see,...so the pedal is pushed farther down . Actually I can't stand anything less than 90 on the freeway. Around towning is always 50-60 unless school zone...I'm not a complete pyscho. Tee hee.
ive cruised at around 90 for extend periods on the higway without ill effect

gas mileage isnt anywhere near the rated 36mpg or whatever tho when you get above 70mph =)


hell I ran all day at texas world speedyway constantly near redline and the engine didn't complain one bit.
Old Mar 30, 2004 | 07:12 PM
  #30  
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Originally Posted by fr130
I guess this is a manul tranny issue (70@3.9k rpm)? At 70MPH, mine (auto-tranny) is at 3K. Then again, I drive slowly to 70MPH on a flat freeway.
no, it is not normal.....it should be around 4k rpm @ 80mph, not 70mph...

at least that is what mine does.....and i have 5 speed...
Old Mar 30, 2004 | 09:04 PM
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the auto is supposed to have higher RPMs then the 5 speed. The auto is a 4 speed and the manual is 5. I know because when I make a manifold back system for any scion, I have to ask if it is an auto or stick. The auto is louder on the freeway then the manual. I have done testing and heard the complaints!
Old Mar 30, 2004 | 10:03 PM
  #32  
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does anyone know what gear ratio is in the axle? i thought i read somewhere that it had 4.11's so the it could make better use of the 108hp. if this is so then of course it turns 4k at 80, that what my 5speed does too. its the price you pay for low gears and a little engine.
Old Mar 30, 2004 | 10:18 PM
  #33  
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Maybe I;m nuts but my xb auto tops at 3200rpm's at 80mph with 15's.
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