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4.7 fd into 5th gear b16tranny at 1/4

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Old Dec 23, 2003 | 07:23 AM
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jeremy.'s Avatar
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Default 4.7 fd into 5th gear b16tranny at 1/4

still debating on a final drive for the future....i've seen 4.7's pull better et's the 4.9's. but i plan on putting in a ls 5th gear and was wondering if i used a 4.7 final drive in a b16...would i have to shift into 5th at a 1/4 track?
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Old Dec 23, 2003 | 08:40 AM
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Default Re: 4.7 fd into 5th gear b16tranny at 1/4 (ek_jeremy)

depends on your tire size and trap speed you can figure it out here
http://www.autocrossing.com/cgi-bin/gearcalc.cgi
most likely not though
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Old Dec 23, 2003 | 09:21 AM
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Default Re: 4.7 fd into 5th gear b16tranny at 1/4 (TREVER)

you probably won't but it all depends on horsepower, tire size, maximum rpm, etc....


I'm planning on using a 4.76FD, crossing the traps at 8500rpm on 24.5" slicks at around 117mph!

If not perhaps 23*8*13 slicks with the 4.76, 9000-9500
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Old Dec 23, 2003 | 02:10 PM
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Default

I'd be surprised if you make it to fifth in the quarter. I've never made it to fourth myself.
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Old Dec 23, 2003 | 05:16 PM
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USDM itr tranny, JDM Final Drive, BFG 205-50/15's and I'm around 8,300rpm in 4th gear at the line while pulling a ~13.7-13.8.

Here's a great calculator that helps you out with gearing:
http://www.autocrossing.com/cgi-bin/gearcalc.cgi

Austin
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Old Dec 23, 2003 | 09:24 PM
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Default Re: (RayB)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RayB &raquo;</TD></TR><TR><TD CLASS="quote">I'd be surprised if you make it to fifth in the quarter. I've never made it to fourth myself.</TD></TR></TABLE>SHOOOOT. I make it into 4th in the eighth in my ls.
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Old Dec 23, 2003 | 09:25 PM
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Default Re: (Austin)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Austin &raquo;</TD></TR><TR><TD CLASS="quote">USDM itr tranny, JDM Final Drive, BFG 205-50/15's and I'm around 8,300rpm in 4th gear at the line while pulling a ~13.7-13.8.

Here's a great calculator that helps you out with gearing:
http://www.autocrossing.com/cgi-bin/gearcalc.cgi

Austin</TD></TR></TABLE>what engine?
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Old Dec 24, 2003 | 09:17 AM
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Default Re: (EF9_SiR)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EF9_SiR &raquo;</TD></TR><TR><TD CLASS="quote">what engine?</TD></TR></TABLE>

B18C5, 2001 Type-R.

Austin
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Old Dec 24, 2003 | 09:57 AM
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Default Re: (Austin)

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

B18C5, 2001 Type-R.

Austin</TD></TR></TABLE>ok I was like DAMN!!!!!!!
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Old Dec 24, 2003 | 11:17 AM
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Default Re: (Austin)

i hit 5th in the quarter mile with my b20tec with 4.785 in b16 tranny with 180 hp
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Old Dec 24, 2003 | 03:58 PM
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Default Re: (chad)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chad &raquo;</TD></TR><TR><TD CLASS="quote">i hit 5th in the quarter mile with my b20tec with 4.785 in b16 tranny with 180 hp</TD></TR></TABLE>
what's your best et? what size tires/rim? what's the car weight?
i'm thinking of doing the 4.78 thing, but i might need more rpms out of my crvtec
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