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View Full Version : F2K5 vs B2K5 Transmission Ratio



carotman
12-24-2002, 07:24 AM
Well, I just bought my B20A manual Transmission (oh yeah)

I got the B2K5 Model (came from a Gold Top B20A)

I was wondering if anyone had the gear ratio for both of these transmissions?!?!

YK86
12-24-2002, 07:49 AM
How much was it?

carotman
12-24-2002, 09:01 AM
250 Canadian :)

But I'll need the flywheel guard (under the block) the flywheel itself and the clutch/pressure plate

AccordEXI
12-24-2002, 09:11 AM
B2K5 ratios are:
1st 3.166
2nd 1.857
3rd 1.259
4th 0.967
5th 0.794
Reverse 3.000
Final reduction 4.066

BTW, the ratios are the same for all B2K5's whether it came from an Accord or Prelude.
No idea about the F2K5.

BensAccordLxi
12-24-2002, 09:18 AM
How do you like that B20?

carotman
12-24-2002, 09:26 AM
Thanks AccordEXI :)

I'll soon start to rebuild my B20a with some *special* parts :smokin: This is when I'll be enjoying it the most I think.

Versanick
06-04-2005, 11:03 AM
I have a b20a, and I have higher RPM in every gear than my buddy with his 92 GSR w/ys1 tranny. Those gear ratios are:
3.307
2.105
1.459
1.107
.875
reverse: 3.00
final 4.40

I don't know any way that we could possibly have gears that are that much longer than the ys1... His slightly larger rims and tires can't be completely making up the difference. I don't know if I believe those gear ratio numbers. I would like to test them when I take my tranny apart this next winter..

TWOLOUDNPROUD
12-20-2007, 10:44 PM
Go Here>http://www.fatboyraceworks.com/gears/index.php?MaxRPM=7500&TireDiameter=23.46&GearRatio1=3.181&GearRatio2=1.842&GearRatio3=1.208&GearRatio4=.878&GearRatio5=.694&GearRatio6=&FinalDrive=4.066&TireWidth=205&TireAspect=40&RimDiameter=17&MaxRPM_2=7500&TireDiameter_2=23.46&GearRatio1_2=3.23&GearRatio2_2=1.9&GearRatio3_2=1.269&GearRatio4_2=0.966&GearRatio5_2=0.742&GearRatio6_2=0&FinalDrive_2=4.266&TireWidth_2=205&TireAspect_2=40&RimDiameter_2=17&Calculate=Calculate%2FGraph&Compare=1

TWOLOUDNPROUD
12-20-2007, 10:48 PM
Move this thread to JDM B18A / B20A Swap Tech

AccordB20A
12-23-2007, 08:56 PM
Still nobody knows the difference between the b2k5 and the f2k5 B20A gearboxes. I now own both boxes. Wonder if theres a difference in the lengths of the gears

TWOLOUDNPROUD
12-24-2007, 01:08 AM
Still nobody knows the difference between the b2k5 and the f2k5 B20A gearboxes. I now own both boxes. Wonder if theres a difference in the lengths of the gears

i had both and i could not tell the difference.

AccordB20A
12-24-2007, 01:19 AM
I know that my digi dash is accurate on the f2k5 and its 10 km/h out on the b2k5 lol

thegreatdane
12-24-2007, 08:32 AM
There is a difference in the ratios between the two trannys but I dont know the numbers for the F2K5. Someone take one apart and count the teeths. No? :)

TWOLOUDNPROUD
12-24-2007, 12:02 PM
There is a difference in the ratios between the two trannys but I dont know the numbers for the F2K5. Someone take one apart and count the teeths. No? :)

i just had mine apart to dam.

AccordB20A
12-24-2007, 01:10 PM
i blew one a while back. man it was a cunt to get apart to strip it down for scrap lol

why did they change the gearbox between 86 and 88 i wonder.. probably so the underpowered craptop (blacktop) could still propell the car haha

TWOLOUDNPROUD
12-24-2007, 03:20 PM
i blew one a while back. man it was a cunt to get apart to strip it down for scrap lol

why did they change the gearbox between 86 and 88 i wonder.. probably so the underpowered craptop (blacktop) could still propell the car haha

I had mine apart in under five minutes. AccordB20A the next one you tare apart i will buy the gears from you let me know.

AccordB20A
12-25-2007, 12:13 PM
I had mine apart in under five minutes. AccordB20A the next one you tare apart i will buy the gears from you let me know.

that hopefully wont happen. I dont wanna blow another one lol

TWOLOUDNPROUD
01-05-2008, 05:56 PM
Tire Size
205/40/17
Tire Diameter in 23.46
RPM Redline 7500

Transmission & Gear Ratios

B2K5 ratios are:
1st 3.166 40.68MPH
2nd 1.857 69.35MPH
3rd 1.259 102.3MPH
4th 0.967 133.19MPH
5th 0.794 !62.2MPH
Reverse 3.000
Final reduction 4.066

And

F2K5 ratios are:
1st 3.166 40.68MPH
2nd 1.772 72.68MPH
3rd 1.185 108.68MPH
4th 0.967 133.19MPH
5th 0.794 162.2MPH
Reverse 3.000
Final reduction 4.066

Here the Calculator i used
http://www.fatboyraceworks.com/gears/index.php?MaxRPM=7800&TireDiameter=23.46&GearRatio1=3.166&GearRatio2=1.857&GearRatio3=1.259&GearRatio4=.967&GearRatio5=.794&GearRatio6=&FinalDrive=4.066&TireWidth=205&TireAspect=40&RimDiameter=17&MaxRPM_2=7800&TireDiameter_2=23.46&GearRatio1_2=3.166&GearRatio2_2=1.772&GearRatio3_2=1.185&GearRatio4_2=0.967&GearRatio5_2=0.794&GearRatio6_2=0&FinalDrive_2=4.066&TireWidth_2=205&TireAspect_2=40&RimDiameter_2=17&Calculate=Calculate%2FGraph&Compare=1

And a special Thanks to thegreatdane for telling me where i can find these Number's.

TWOLOUDNPROUD
08-22-2008, 10:24 AM
^^^^^^^^^^^^^^^^Update^^^^^^^^^^^^

AccordB20A
08-22-2008, 11:41 AM
mean. so there is a difference in 2nd and 3rd lol. nice to know. i run a f2k5 box and now i know theres not much of a difference i will probably install my other b2k5 when i swap motors.

I cant tell the difference between the two.

TWOLOUDNPROUD
08-22-2008, 11:57 AM
mean. so there is a difference in 2nd and 3rd lol. nice to know. i run a f2k5 box and now i know theres not much of a difference i will probably install my other b2k5 when i swap motors.

I cant tell the difference between the two.

The F2k5 is 3.33mph faster in 2gear and 6.38mph faster in 3gear then the B2K5 that not much of a difference between the two trany's