Those with heads/cam/A4 and 4.10s
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Those with heads/cam/A4 and 4.10s What were the 4.10s worth for you over 3.23s? Looking at my dyno chart and doing some pseudo math, it looks like I will pick up .3ths and 3-4mph, all else being equal (including 60' time). It looks like I'll pick up .2ths and 2-3mph with 3.73s.
What have you guys seen in practice?
What have you guys seen in practice?
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Re: Those with heads/cam/A4 and 4.10s The reason I'm asking is if 3.73s or 4.10s are only going to be worth .1th for me, I'd rather not switch. But for .2ths, its worth it.
Re: Those with heads/cam/A4 and 4.10s Terry,
I've switched from 3.23s to 3.73s on two different LS1 F-Bodies. Both were very different cars, but the results were similar. My '98 Z-28 was a heads/cam car with a Super Yank 4000 converter. Swapping from 3.23s to 3.73s gained me .05 in ET and 1.5 mph in the traps.
My '00 WS6 had a stock motor and a Yank 3600 Extreme converter. Again, I gained .05 in ET and 1.5 mph in the traps.
Brooke (99RedHawk) found similar gains as well with his 'Hawk. With a loose converter (like a Super Thruster 3500/Vig3200 or looser), you will not gain the 2 tenths like you would with a lower stall converter. With a stock converter, the gain would be at least 3 tenths, but with your 3800, I'm afraid going to 4.10s might only gain you a tenth to a tenth and a half max.
Good thing about 4.10s come when you want to run a taller tire. You can get some major hooking with a 28" tall tire, 4.10 gears and a loose converter with a high STR. Talk about launch city!
I've switched from 3.23s to 3.73s on two different LS1 F-Bodies. Both were very different cars, but the results were similar. My '98 Z-28 was a heads/cam car with a Super Yank 4000 converter. Swapping from 3.23s to 3.73s gained me .05 in ET and 1.5 mph in the traps.
My '00 WS6 had a stock motor and a Yank 3600 Extreme converter. Again, I gained .05 in ET and 1.5 mph in the traps.
Brooke (99RedHawk) found similar gains as well with his 'Hawk. With a loose converter (like a Super Thruster 3500/Vig3200 or looser), you will not gain the 2 tenths like you would with a lower stall converter. With a stock converter, the gain would be at least 3 tenths, but with your 3800, I'm afraid going to 4.10s might only gain you a tenth to a tenth and a half max.
Good thing about 4.10s come when you want to run a taller tire. You can get some major hooking with a 28" tall tire, 4.10 gears and a loose converter with a high STR. Talk about launch city!
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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Re: Those with heads/cam/A4 and 4.10s Gaining only .05th is my concern. On paper with the 3.23s I'd have to go through the traps at 156mph to really use my power band, vs 133mph with the 3.73s. I guess I'll keep playing with the 3.23s, and might try 3.73s or 4.10s only if I can find someone selling a complete rear end for $400 or so. That way if it doesn't do much, I can easily swap back. 3.23s also keep me from having to worry about locking the torque converter up. <img src="images/icons/wink.gif" border="0">
I'm adding an extra 29 cubic inches to the motor soon (with larger valves and a bit more headwork), and I'm hoping to pick up another 30-40rwhp and broaden the power band. With that new setup, the 3.73s/4.10s will probably be even more of a moot point.
Thanks for the feedback. BTW the ST3800 I have is a great converter! I suggest it to anyone doing heads/cam, who wants to also run 3.23 gears.
I'm adding an extra 29 cubic inches to the motor soon (with larger valves and a bit more headwork), and I'm hoping to pick up another 30-40rwhp and broaden the power band. With that new setup, the 3.73s/4.10s will probably be even more of a moot point.
Thanks for the feedback. BTW the ST3800 I have is a great converter! I suggest it to anyone doing heads/cam, who wants to also run 3.23 gears.
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From: I-L-L-I-N-O-I-S
Re: Those with heads/cam/A4 and 4.10s [quote]Originally posted by Patrick G:
<strong>Terry,
I've switched from 3.23s to 3.73s on two different LS1 F-Bodies. Both were very different cars, but the results were similar. My '98 Z-28 was a heads/cam car with a Super Yank 4000 converter. Swapping from 3.23s to 3.73s gained me .05 in ET and 1.5 mph in the traps.
My '00 WS6 had a stock motor and a Yank 3600 Extreme converter. Again, I gained .05 in ET and 1.5 mph in the traps.
Brooke (99RedHawk) found similar gains as well with his 'Hawk. With a loose converter (like a Super Thruster 3500/Vig3200 or looser), you will not gain the 2 tenths like you would with a lower stall converter. With a stock converter, the gain would be at least 3 tenths, but with your 3800, I'm afraid going to 4.10s might only gain you a tenth to a tenth and a half max.
Good thing about 4.10s come when you want to run a taller tire. You can get some major hooking with a 28" tall tire, 4.10 gears and a loose converter with a high STR. Talk about launch city!</strong><hr></blockquote>
Are you saying that changing over 3.23's to 3.73's would give you about a 3 tenths gain on a stock convertered car? I thought maybe a tenth to a tenth in a half. If that is really the case, I'll do that seeing as I don't have an aftermarket converter in my car.
Can anyone confirm this?
Mike
<strong>Terry,
I've switched from 3.23s to 3.73s on two different LS1 F-Bodies. Both were very different cars, but the results were similar. My '98 Z-28 was a heads/cam car with a Super Yank 4000 converter. Swapping from 3.23s to 3.73s gained me .05 in ET and 1.5 mph in the traps.
My '00 WS6 had a stock motor and a Yank 3600 Extreme converter. Again, I gained .05 in ET and 1.5 mph in the traps.
Brooke (99RedHawk) found similar gains as well with his 'Hawk. With a loose converter (like a Super Thruster 3500/Vig3200 or looser), you will not gain the 2 tenths like you would with a lower stall converter. With a stock converter, the gain would be at least 3 tenths, but with your 3800, I'm afraid going to 4.10s might only gain you a tenth to a tenth and a half max.
Good thing about 4.10s come when you want to run a taller tire. You can get some major hooking with a 28" tall tire, 4.10 gears and a loose converter with a high STR. Talk about launch city!</strong><hr></blockquote>
Are you saying that changing over 3.23's to 3.73's would give you about a 3 tenths gain on a stock convertered car? I thought maybe a tenth to a tenth in a half. If that is really the case, I'll do that seeing as I don't have an aftermarket converter in my car.
Can anyone confirm this?
Mike
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Re: Those with heads/cam/A4 and 4.10s Go with the 4.10's man <img src="images/icons/smile.gif" border="0">
It isnt bad on the highway and it feels awesome off the line <img src="images/icons/smile.gif" border="0">
Especially with your powerband!!
Cheers,
Chris
It isnt bad on the highway and it feels awesome off the line <img src="images/icons/smile.gif" border="0">
Especially with your powerband!!
Cheers,
Chris
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