Automatic Vs. Manual

[freakonaleash1187]

i couldnt think of the words when i put performance at. a shift kit will make an automatic faster. it MIGHT make it faster than a manual. i dont know what a stall converter is so somebody else will have to answer you on that one.

[chevydrummer76]

A stall converter will only help you off the line. Instead of racing right off of idle, your car wont move until it hits whatever rpm stall converter you get. So if you had a 2200 rpm stall converter, once your floor it and your rpms hit 2200 it will give you a better launch. Its the same affect as dropping the clutch in a manual.

[Joseph1082]

Ok, well, I could power break in an AT to launch at 2200 or even higher, and even w/ a shift kit, I think i have some manual driving friends that could still shift faster, so i fail to see what makes an auto good.

[70z]

I bet they can't shift instantaneously. I used to think the same way. I was a died hard 4 speed nut. I had a v-gate shifter that had at most a 3" stroke from 1st. to 2nd. etc. I would pull hard on the shifter and at red line I would jam the clutch and let my foot slip off it on the way down. At most a 500 RPM surge between gears. I never timed it but I'll bet the shift still took ,.1 to .2 sec,. at least. If you shift 3 times with a 4 speed that's pretty close to 1/2 second give or take that you are not under power. How far can a car go in 1/2 Sec. quite a ways if it's a fast car. A properly prepared powerglide will shift seamlessly (1) time. it's true you need a good power to weight ratio to use a powerglide, and i wouldn't use a stock case for high H.P. Better to use a J.W. or ultraglide case which is already SFI Certified. Then there's no need for a blanket. You can set up a glide to leave at any RPM with your converter selection. A trans. brake coming off the line @ 6,500 RPM is pretty tough to beat. The powerglide is the overwhelming transmission of choice at the track. Unless your talking high end users like lenco, but then your spending Big $$$$$$. You can get a powerglide and converter for $3,500 or so. A Hughes glide will run closer to $4,500. Way less than a lenco. A 4 speed won't handle as much H.P. as a glide either. A properly built glide with handle 1,000 to 1,200 H.P. with no problems. A 4 speed will handle maybe 400 to 500 H.P. Build for competition maybe 1,000 h.p. If your comparing stock to stock a manual trans. will probably be faster, but why would you race with stock components?

[70z]

Originally Posted by chevydrummer76

A stall converter will only help you off the line. Instead of racing right off of idle, your car wont move until it hits whatever rpm stall converter you get. So if you had a 2200 rpm stall converter, once your floor it and your rpms hit 2200 it will give you a better launch. Its the same affect as dropping the clutch in a manual.

The converters "Stall" is determined by a combination of things. Generally the smaller the converter the higher the stall speed. But it is also determined by the pitch of the fins inside the converter. Another factor is engine torque. More torque higher stall speed.
When buying a Converter there are many thing to consider to get the best "Launch". Engine displacement, Vehicle weight, Rear end gear ratio, rear tire size, Horsepower, transmission gear ratio, Power curve of the engine.

[freakonaleash1187]

oh yeah, now i remember about stall. i learned it in auto. tech. last semester. now im rebuilding an at and there is tons of snap rings and clutches. my teacher is having me put the tranny back together with no book, it is really hard.

[70z]

Originally Posted by freakonaleash1187

oh yeah, now i remember about stall. i learned it in auto. tech. last semester. now im rebuilding an at and there is tons of snap rings and clutches. my teacher is having me put the tranny back together with no book, it is really hard.

The trans. has all the snap rings. The converter is a welded unit that slides over the input shaft of the tranny and bolts to the flex plate (flywheel) and acts as the clutch.
Puttin' trannys back together:
The more of um' you put together the easier it will get. You'll be a pro in no time.

[Joseph1082]

I was asking about modified street cars, you are telling me for about $3500 I can make my Auto better than stick... I can't think of one person I know who would do that... if you were to give my $3500 it would go straight into the engine, and it would make a hell more of a difference than it would in the transmission, i think you misunderstood me.

[freakonaleash1187]

Originally Posted by 70z

The trans. has all the snap rings. The converter is a welded unit that slides over the input shaft of the tranny and bolts to the flex plate (flywheel) and acts as the clutch.
Puttin' trannys back together:
The more of um' you put together the easier it will get. You'll be a pro in no time.

we didnt take the converter apart cuz we already looked at one last semester. if somebody hasnt seen inside a converter, its nuts looking with the design of the fins. but after taking this tranny apart (and we rebuilt a differential) i have noticed how much weight is in the parts. damn they are heavy.

[70z]

Originally Posted by Joseph1082

I was asking about modified street cars, you are telling me for about $3500 I can make my Auto better than stick... I can't think of one person I know who would do that... if you were to give my $3500 it would go straight into the engine, and it would make a hell more of a difference than it would in the transmission, i think you misunderstood me.

Actually I WAS talking about modified street cars. I am building a Pro Street 70 Z-28. I put some pics. in the gallery to show you.

http://files.automotiveforums.com/ga...&cat=500&page=

This will be a street legal Pump gas (w/octane booster) car. It will have an Ultraglide trans. After doing much research I found that anything less behind a blown-injected 572 BBC will not withstand the torque. A 4 speed behind a high H.P. engine would not hold up with sticky tires.

[Joseph1082]

Ok, my bad, that sounds like a hell of a lot of fun
Can you answer me one question though, do you think I made a mistake then buying a m6 02 Z28 rahter than the AT? I wanted the m6 because I thought it w

[Joseph1082]

ould be faster? sorry got cut in half

[70z]

Originally Posted by Joseph1082

ould be faster? sorry got cut in half

Na. The M6 will be fun to drive.

[Joseph1082]

It is believe me, and i think it is faster too, every ratio except first is better, and the gears are closer together which means less power drop after shifts, and it has more usable gears... these are the reasons i bought it... my auto sucked after you were out of second, it was the 4l60e.

[corolla99]

i have an automatic right know and i pretty much got the car from my gram and never wanted a standard at first for the same reason now im selling the car and i want a standard cause like the other said soon you will be able to do all that with barely any hassle and no matter what traffic is a bitch