577HondaPrelude

Hey guys,

I'm trying to talk Mfactory into making us a 5.2 Final Drive and I need to know if anyone would be interested. This final drive gear ratio would give us the option of running 245/45-16 tires and still have great gearing for acceleration! 5th gear would top out at about 130 to 135mph on those tires. For those of you who track your car this is plenty of top speed, and the fat tires would really help braking and cornering. If we get enough interest the price should be $500 to $700 for the FD. Anyone interested other than me?

This FD ratio with 245/45-16 tires, VS the stock FD and stock tire size would easily take several seconds off your lap times.

Silver Surfer

sounds like a plan to me.....i'd be up for it, but probably not until the end of this year

also i assume you are running 16x8 with that tire size? never bothered to look into it.......what/where are some of the wheel options in 16x8

championshipwhite93si

holy damn.. and i thought the 4.71 gear was gonna be nice.

577HondaPrelude

4.71 is good on 15's, but the size of "fat" tires for 15's is a bit limited. 245/45-16 is a common tire size and will fit on our cars, we just need a good FD to make up for the larger overall diameter. Also the stock FD is way to small even on stock tires.

I use 16x7, because of the rules in Honda challenge, however a 16x8 would be even better.

I found a great deal on some light 16x7's 5lug, for only $79 a wheel !!
http://www.edgeracing.com/wheel/3411/

alterdcreations

what would the top speed be with 18 inch rims
235/40 ??

skunked

Holly FD!

Sounds Nasty

95PreludeSi

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 577HondaPrelude &raquo;</TD></TR><TR><TD CLASS="quote">4.71 is good on 15's, but the size of "fat" tires for 15's is a bit limited. </TD></TR></TABLE>

Hoosier is supposed to be making a 275/35/15 soon

Too bad it will never fit on a prelude

crj_lll

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 577HondaPrelude &raquo;</TD></TR><TR><TD CLASS="quote">Hey guys,

I'm trying to talk Mfactory into making us a 5.2 Final Drive and I need to know if anyone would be interested. This final drive gear ratio would give us the option of running 245/45-16 tires and still have great gearing for acceleration! 5th gear would top out at about 130 to 135mph on those tires. For those of you who track your car this is plenty of top speed, and the fat tires would really help braking and cornering. If we get enough interest the price should be $500 to $700 for the FD. Anyone interested other than me?

This FD ratio with 245/45-16 tires, VS the stock FD and stock tire size would easily take several seconds off your lap times. </TD></TR></TABLE>

Is this for a 4th generation 5 Speed H22 Tranny or for a 5th Generation 6 speed tranny? I know nothing about 5th generation trannies so I guess they could be interchangable but I doubted it so I asked.

If it is for the 4th generation, count me in. Will this be rated for stricly drag use , as in 2 - 5 runs before it breaks, autocross track use or for limited street use as well. I ask because I know depending on the intended application, the materials used may be different.

I tried this a while back and never got enough people together. Fill me in on the details of the peice please.

alterdcreations

their both 5 speed trammys

577HondaPrelude

Below are some calculations of FD's and top speed. Note: we want the biggest tire width and a top speed of 130ish +- 3mph. I got the 130 top speed number from my experience on various race tracks. Mid-Ohio, Summit Point, Beaverun, Putnam Park, & Nelson Ledges. A top speed of about 130 gives the best overall gearing for great acceleration and just enough top end speed without running out of gear.

FD comparison chart

--------------------------FD ratio-----------(4.266 = OEM)
Tire Size----width----4.266----4.7----5.2----
225/45/15----9.0-----143-----130----117----
225/50/15----9.2-----149-----135----122----
205/50/16----8.4-----150-----136----123----
225/50/16----9.2-----155-----141----127----
245/45/16----9.6-----154-----140----127----

235/40/18----9.4-----158-----144----130----

The new 5.2FD would fit both 4th and 5th gen H22a 5 speed tranny's.
It will be made like the other Mfactory FD sets, which is very very strong and will handle road racing, drag racing, and street use! I used their 4.7FD all last year in my race car with zero problems at all. It should last the life of the car and never brake.





Modified by 577HondaPrelude at 4:34 PM 1/3/2007

117

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95PreludeSi &raquo;</TD></TR><TR><TD CLASS="quote">Hoosier is supposed to be making a 275/35/15 soon

Too bad it will never fit on a prelude </TD></TR></TABLE>

They'd fit with a little work.

alterdcreations

those numbers are with the prelude tranny right?
i wonder what it would top out at if you were to use accord gears with that fd?

117

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 577HondaPrelude &raquo;</TD></TR><TR><TD CLASS="quote">This also lets us never drop out of VTEC if you shift at red line.</TD></TR></TABLE>

Note that changing the FD does not change the gear spacing or RPM drop between gears.

For those of you using larger than stock OD tires, this is a very worthwhile modificaiton. I run a 4.714 FD, but I also run 22.8" OD tires (225/45/15s). I need to double check my calculations, but it tops out right around 130 at 7800 RPMs. It works perfect for most tracks, although there is one track in Texas where I run out of 5th (I'm too chicken to take 5th to fuel cut).

I have my reasons for running 15s, but this is something worth thinking about to run 16s.

117

Hey Walter, did you measure your FD prior to installation?

577HondaPrelude

you mean my old Mfactory FD? I did not measure it, but I can when I take it out in a few weeks

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">I run a 4.714 FD, but I also run 22.8" OD tires (225/45/15s).</TD></TR></TABLE>

I ran something very similar all last year. This is a great set up, however all the other Honda challenge guys also run 225/45/15s but they have a much lower min. weight. This hurts us in the turns a bit. With an even fatter tire (we can actually fit fatter tires were most other HC cars can not!), we will not lose ground in the turns and out power them down the straits.... I hope. The only problem is we need to move up to 16's to find a fatter Toyo RA1 tire, thus the need for a 5.2FD.

PS. also 16's will make us legal in SCCA ITS and we can whip up on the RX7's a bit there.

117

Yes, let me know. Thanks!

crj_lll

Count me in. I will just need some lead time when the group buy is to take place.

alterdcreations

if you were to use a accord 5th gear what would the top speed be?

95PreludeSi

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alterdcreations &raquo;</TD></TR><TR><TD CLASS="quote">if you were to use a accord 5th gear what would the top speed be?</TD></TR></TABLE>

What would be the point? Why go with a higher FD if you would just lower it with and accord 5th gear?

mgags7

If you put an accord 5th in there with this FD you would kill your accel.

Esp in say a 1/4 mile run, 4th runs out at 99mph with my 4.71, so 5th will be necessary, that will be even worse with the 5.2; that idea sucks

besides, 5th isn't that bad on the highway....75mph = ~4600rpm

this thing would be insane on stock size tires.....tempting....

lude98SH

Wait so u would defly need 5th gear in the 1/4 mile with an m2b4 or m2f4 trans with a 4.7 or 5.2 FD ?

If so that kinda screws my idea of using an accord or 5th gen 5th gear

darkspector2.0

I think a 5.2 FD would own on the street... when are you gonna need 130mph on the street? only thing is gas mileage would go down a bit... but... who cares LoL i'm down.. if i'm far enough along on my build

lude98SH

yea trueee

DCFIVER

sounds nice. how many people do they need??

577HondaPrelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Wait so u would defly need 5th gear in the 1/4 mile with an m2b4 or m2f4 trans with a 4.7 or 5.2 FD ? </TD></TR></TABLE>

depends how fast your car is in 1/4 mile. 4th gear will top out at about 100 to 105 with a 5.2fd and 16inch wheels, that means you will need 5th if you go faster than 105mph in a 1/4 mile run. 100 to 105 should put you in the mid to low 13's, if you plan to brake into the 12's then you would most likely need taller tires, lower FD, or get stuck using 5th gear.