3:45 to 4:11
Thread Starter
Racer
Joined: Jul 2016
Posts: 299
Likes: 15
3:45 to 4:11
Anyone have a direct comparison 1/4 mile, cruise speed, etc. between an M6 car before and after? It seems most people do the ring gear along with lots of other mods which muddies the water a lot.
Le Mans Master
Joined: Sep 2013
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From: near the thumb in the mitten
Wallace Racing although primarily a.Pontiac site has all kinds of calculators
Including 1/4 mile performance and rpm/ speed. There still be variables exact weight, hp, tire diameter and compound. But you should be able to see what to expect.
Including 1/4 mile performance and rpm/ speed. There still be variables exact weight, hp, tire diameter and compound. But you should be able to see what to expect.
Thread Starter
Racer
Joined: Jul 2016
Posts: 299
Likes: 15
Oh believe me, ive beat the calculators to death, im hoping for real world actual data... lol
Le Mans Master
Joined: Aug 2015
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From: St. Charles MO
It's going to depend a lot on your other mods, especially how much power you're making. A stock LT4 on 25.6"-tall tires will top out at 109mph in 3rd gear and 141mph in 4th. Ergo, you'll use three gears in the 1/4-mile. With 4.11s you top out at 118mph in 4th, meaning you'll use most of four gears and put down more average power. You get a lower ET and higher trap speed, assuming you're good at shifting quickly. My car has a lot more power than stock, so I'd probably 3.73s for a top speed in 4th of 130mph (it won't hit the traps at 130, but I also probably would be shifting below redline anyway).
Thread Starter
Racer
Joined: Jul 2016
Posts: 299
Likes: 15
It's going to depend a lot on your other mods, especially how much power you're making. A stock LT4 on 25.6"-tall tires will top out at 109mph in 3rd gear and 141mph in 4th. Ergo, you'll use three gears in the 1/4-mile. With 4.11s you top out at 118mph in 4th, meaning you'll use most of four gears and put down more average power. You get a lower ET and higher trap speed, assuming you're good at shifting quickly. My car has a lot more power than stock, so I'd probably 3.73s for a top speed in 4th of 130mph (it won't hit the traps at 130, but I also probably would be shifting below redline anyway).
With the super light aluminum flywheel and balancer, it doesn't like to be lugged. I think 4.11s would really help driveability and since it's M6, it has double overdrive anyways so it's not like I'll be tacking out on the freeway...
Le Mans Master
Joined: Apr 2000
Posts: 5,713
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From: Manassas VA
Mine is a automatic, and has been in various stages of mods. So numbers from mine would not mean much.
That being said, IMO there are few mods to be done that will equal the feel of a gear change. Going from 3.45 to 4.10's in a stick car will make it feel a lot stronger, at least on the street.
I have had 2.59, 3.54, 3.73, and 4.09. Currently have the 3.73 which is about right with the 26in tires. and a automatic, but I liked the 4.09 better.
If I had a stick LT1-4 the first mod I would do would be 4.10 gears!!!
That being said, IMO there are few mods to be done that will equal the feel of a gear change. Going from 3.45 to 4.10's in a stick car will make it feel a lot stronger, at least on the street.
I have had 2.59, 3.54, 3.73, and 4.09. Currently have the 3.73 which is about right with the 26in tires. and a automatic, but I liked the 4.09 better.
If I had a stick LT1-4 the first mod I would do would be 4.10 gears!!!
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Thread Starter
Racer
Joined: Jul 2016
Posts: 299
Likes: 15
Mine is a automatic, and has been in various stages of mods. So numbers from mine would not mean much.
That being said, IMO there are few mods to be done that will equal the feel of a gear change. Going from 3.45 to 4.10's in a stick car will make it feel a lot stronger, at least on the street.
I have had 2.59, 3.54, 3.73, and 4.09. Currently have the 3.73 which is about right with the 26in tires. and a automatic, but I liked the 4.09 better.
If I had a stick LT1-4 the first mod I would do would be 4.10 gears!!!
That being said, IMO there are few mods to be done that will equal the feel of a gear change. Going from 3.45 to 4.10's in a stick car will make it feel a lot stronger, at least on the street.
I have had 2.59, 3.54, 3.73, and 4.09. Currently have the 3.73 which is about right with the 26in tires. and a automatic, but I liked the 4.09 better.
If I had a stick LT1-4 the first mod I would do would be 4.10 gears!!!
Melting Slicks
Joined: Sep 2003
Posts: 2,270
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From: N. Babylon NY
My 1992 with headers, 1.6 rockers, tune, (289WHP) stock DM FW on road race tires went 13.02 at 106.65 MPH. With 4.11 gears (solid 9" axle) Aluminium FW and drag radials (315s x 35 17) same engine went a best of 12.84 at 108.54. IMHO it drove better with the heavy flywheel. If I still had the 6 speed (now 4L80) I would have put a heavier flywheel back in it.
Steve
Steve
Drifting
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From: Hawaii
Thread Starter
Racer
Joined: Jul 2016
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My 1992 with headers, 1.6 rockers, tune, (289WHP) stock DM FW on road race tires went 13.02 at 106.65 MPH. With 4.11 gears (solid 9" axle) Aluminium FW and drag radials (315s x 35 17) same engine went a best of 12.84 at 108.54. IMHO it drove better with the heavy flywheel. If I still had the 6 speed (now 4L80) I would have put a heavier flywheel back in it.
Steve
Steve
Thread Starter
Racer
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Le Mans Master
Joined: Aug 2015
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From: St. Charles MO
My car is currently 385hp 382tq at the wheels with Nitto 305/35-19 NT05R drag radials.
With the super light aluminum flywheel and balancer, it doesn't like to be lugged. I think 4.11s would really help driveability and since it's M6, it has double overdrive anyways so it's not like I'll be tacking out on the freeway...
With the super light aluminum flywheel and balancer, it doesn't like to be lugged. I think 4.11s would really help driveability and since it's M6, it has double overdrive anyways so it's not like I'll be tacking out on the freeway...
The right gear is really going to depend on the use of the car. You specifically asked about 1/4-mile performance, so I focused a lot on that. With your power, you may bump into the rev limiter in 4th before the traps, unless you've extended the redline beyond stock. Come to think of it, I quoted you speeds based on the 6400-rpm redline of my LT4. If your car is an LT1, then redline is (I think) 6100rpm and you will top out your gears at lower speeds than I quoted.
On the highway, 6th gear will still be pretty tall with 4.11s. At 70mph it will go from 1600rpm to 1900rpm. The only gotcha with that is that if your car currently drones between 70-80mph, which is common, then you'll be putting the drone right in the range where you typically run on the highway.
Melting Slicks
Joined: Sep 2003
Posts: 2,270
Likes: 118
From: N. Babylon NY
Thread Starter
Racer
Joined: Jul 2016
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You guys must be using the mobile app and not seeing my signature.
This car has a big cam, aluminum flywheel and balancer a mechanical water pump delete including single roller SBC. 28 pounds reduction in rotating mass with 110 LSA means no lugging...lol
This car has a big cam, aluminum flywheel and balancer a mechanical water pump delete including single roller SBC. 28 pounds reduction in rotating mass with 110 LSA means no lugging...lol
Last edited by lt4 coupe; Nov 22, 2019 at 09:35 PM.
Race Director
Joined: Sep 2001
Posts: 14,685
Likes: 753
From: NEwhere Ohio
Ive thought about this as I already get into 4th gear (trap 121) in the 1/4.
that said, am i just gonna sit and spin in 1st?
toyo proxes r888, 93 6spd supercharged afr195 comp eliminator heads, 224/236 cam
that said, am i just gonna sit and spin in 1st?
toyo proxes r888, 93 6spd supercharged afr195 comp eliminator heads, 224/236 cam
Last edited by dizwiz24; Nov 22, 2019 at 09:41 PM.
Le Mans Master
Joined: Aug 2015
Posts: 6,125
Likes: 2,000
From: St. Charles MO
D'oh! Nope, just oblivious to the obvious.
I forgot to mention that I too have a 13lb aluminum flywheel and a lightened GM race pressure plate. And 108* LSA with super aggressive ramps (i.e. significant overlap). Lugging isn't a problem. At all.
This car has a big cam, aluminum flywheel and balancer a mechanical water pump delete including single roller SBC. 28 pounds reduction in rotating mass with 110 LSA means no lugging...lol