LFX Build Thread
#81
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I ordered the Dorman HELP AC Bypass Pulley 34157
Amazon.com: Dorman HELP AC Bypass Pulley 34157: Automotive
Amazon.com: Dorman HELP AC Bypass Pulley 34157: Automotive
#82
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I *think* the 3.42 will be a good ratio for the track, but for a street car the 3.2x the V8R used would be better. The ratios used in the AY6 trans are a little odd. 1st is a stump puller. Great for burnouts! 4th to 5th is almost the same but 6th is a good bit taller. We'll see...
#83
I just asked that
6th is basically an overdrive, with a big drop for the 1:1 5th down to 0.75:1. The thing I've tossed between, given a couple of our SoCal tracks that would see a 300hp car over 140mph, is whether it would be better to gear longer so that you don't need 6th at all at those tracks, but be stuck with longer gearing everywhere else, or just go short and accept that you'll need to nudge into 6th on the front straights for WSIR and ACS. You aren't accelerating much up at those speeds anyways, so I've decided it'll be better to go short on the rear ratio.
6th is basically an overdrive, with a big drop for the 1:1 5th down to 0.75:1. The thing I've tossed between, given a couple of our SoCal tracks that would see a 300hp car over 140mph, is whether it would be better to gear longer so that you don't need 6th at all at those tracks, but be stuck with longer gearing everywhere else, or just go short and accept that you'll need to nudge into 6th on the front straights for WSIR and ACS. You aren't accelerating much up at those speeds anyways, so I've decided it'll be better to go short on the rear ratio.
So if we're considering a 3.46 and a 3.23 rear end and an MV5 transmission, we get the following at 7,200rpm:
3.46 3.23
34 37 1st
65 70 2nd
96 103 3rd
120 129 4th
143 153 5th
170 182 6th
Assuming 205/50-15 tires
So how does this look for your Southern California tracks, such as Streets of Willow, Big Willow, Buttonwillow, Fontucky, Laguna Seca (okay, not SoCal but who doesn't want this on your list)?
#87
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I've got a whole mess of graphs that I've compiled to play with all the different ratio options. The main rub with the trans from the Camaro is the ratio spacing. Here's the Camaro's 6 speed with 3.42 compared to a Miata 5speed with 4.10 gearing to show just how short that 1st and 2nd are:
For the track, that's a useless 2nd gear, so I believe you're better off gearing for 3-5 use, rather than gearing long and having to dip into 2nd gear ever.
Addressing the real issue though would be to use a different transmission...
-Ryan
For the track, that's a useless 2nd gear, so I believe you're better off gearing for 3-5 use, rather than gearing long and having to dip into 2nd gear ever.
Addressing the real issue though would be to use a different transmission...
-Ryan
Last edited by ThePass; 06-04-2015 at 03:22 PM.
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