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Old 12-02-2009, 09:03 PM   #91 (permalink)
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Hopefully, the performance will be high above the price spec. (Compared to COZX2's set, that is.)

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Old 11-18-2012, 10:26 PM   #92 (permalink)
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Did anything ever happen with this?
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Old 11-19-2012, 04:18 AM   #93 (permalink)
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It got back-burnerized.

Bit off more than I could chew. TMFP! (Too many projects!)
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Old 11-19-2012, 04:58 AM   #94 (permalink)
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Jesus, your stock rpms are lower than mine, and your engine has 55% the displacement of mine...definition of jealousy right here 230 dollars for an OEM 0.725 gearset is a bit steep for my sparse driving.
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Old 11-19-2012, 07:41 AM   #95 (permalink)
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Yes, and it still revs too high on the highway!

(Note: it's not the stock RPM though - I've already swapped in the taller final drive from a 1.3L version of this drivetrain.)

I'm pretty sure the Insight's stock gearing is even taller than the Firefly's - I should check that...
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Old 11-19-2012, 05:20 PM   #96 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
Yes, and it still revs too high on the highway!

(Note: it's not the stock RPM though - I've already swapped in the taller final drive from a 1.3L version of this drivetrain.)

I'm pretty sure the Insight's stock gearing is even taller than the Firefly's - I should check that...
Oh I know, I read the thread. Your stock rpms are lower than mine. 3000rpm over here is a tad under 55mph...the best mpg I can get drafting at 50-55 is a little over 40, and the best mpg in gear is about 50 rolling along at idle. Idle load is 18%, highway load is only 30%... If gas were more expensive, a 0.725 5th gear would already be in there, for 11% improvement. Next rear tire change I will try to go up 1 inch in radius to bring it down 4%.

Sort of sad for a car that's about the same size as the Metro. Still, I guess I should be grateful I'm not in an AP2 S2000, which spins it 2.2L engine at the same speeds :O Makes you really scratch your head when you consider that these 5th/6th gears are completely useless on the track, and equally useless on the street.

Last edited by serialk11r; 11-19-2012 at 05:28 PM..
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Old 11-19-2012, 06:31 PM   #97 (permalink)
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What is your RPM at 60 mph with your current gearing? My HCH has very tall gearing, 3.6 final drive and I believe 5th is .76, which puts me at 2,000 RPM at 60
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Old 11-19-2012, 07:10 PM   #98 (permalink)
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Cool project, would like to do the same, that way I can get rid of these big oversize tires.

Might have been the press fit making the gears bigger that caused it to fail.

with 175/70R14 tires: geo still has smallest liter/min

car__________ final ratio__rpm@65mph__displacement-L/min
geo 3cyl_1L _____2.7176___2511.1_______2511.
saturn__1.9L____2.4502___2264.0_______4301.
Crx hf__1.5L____2.0500___1894.2_______2841.
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Last edited by arcosine; 11-19-2012 at 07:30 PM..
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Old 11-20-2012, 08:29 PM   #99 (permalink)
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I was looking at these carborized and induction heated spur gears, looks like module 2.5 38-17 would be the right pitch diameters, that would give a .448 ratio.



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Old 11-21-2012, 01:16 PM   #100 (permalink)
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It might be better to use the small gear as is and EDM cut the spline, that way there is no welding and will fit right on the shaft.. I am not sure what to do with the big gear.

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