How were C4s so quick
Thread Starter
5th Gear
Joined: Nov 2022
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How were C4s so quick
I understand compared to now they’re pretty slow or maybe average but the thing is these things from 85-89 made like 240hp? I also recently found out the corvettes weighed quite a bit like 3200 pounds it confused me how these pulled mid 5s in the 0-60 range.
Melting Slicks
Joined: Jul 2002
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From: Tallahassee fl
Horsepower isn't measurable, it is calculated based on torque. L98's had plenty of torque, 345 with only 245HP. It is simply because they were low revving engines. When I went from a l98 to an LT1 I was getting better 1/4 mile times but it took the while track to catch up to my buddies in L98 cars. I think the L98 is a GREAT street engine. The LT4 is when GM finally got the power right where torque was high across the page AND they can Rev high to make more HP.
This is also why diesels don't make much HP. My truck has nearly 1000 torque, but hp is in the 400's.
This is also why diesels don't make much HP. My truck has nearly 1000 torque, but hp is in the 400's.
Safety Car
Joined: Sep 2001
Posts: 4,153
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From: Glenbeulah Wi
Horsepower isn't measurable, it is calculated based on torque. L98's had plenty of torque, 345 with only 245HP. It is simply because they were low revving engines. When I went from a l98 to an LT1 I was getting better 1/4 mile times but it took the while track to catch up to my buddies in L98 cars. I think the L98 is a GREAT street engine. The LT4 is when GM finally got the power right where torque was high across the page AND they can Rev high to make more HP.
This is also why diesels don't make much HP. My truck has nearly 1000 torque, but hp is in the 400's.
This is also why diesels don't make much HP. My truck has nearly 1000 torque, but hp is in the 400's.
(Torque x RPM)/5252 = HP
The higher the HP under the band where the car is used will give the most acceleration (Torque by itself means nothing) HP tells you how much work can be done. An L98 makes it HP from 2500 to 4500 RPM (Which means it does have good torque in that same RPM band) but the average HP in that RPM band determines how well the car will accelerate.
Last edited by bjankuski; Nov 28, 2022 at 04:11 PM.
Instructor
Joined: Nov 2012
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From: central indiana
the cars certainly lacked power in all regards back in the day. yet they still performed much better than expected.
look at the car minus the power train. chassis was light years ahead of its time, the car is low, somewhat narrow & shaped like a door stop, the engine sits low and behind the front tire, it has a factory 5 link rear suspension, very short driveshaft... is any of this clearing things up? the cars are factory race cars with all of the right ingredients. the only thing they need to compete with & beat a car 35 years newer is a remotely similar power number and updated tire.
look at the car minus the power train. chassis was light years ahead of its time, the car is low, somewhat narrow & shaped like a door stop, the engine sits low and behind the front tire, it has a factory 5 link rear suspension, very short driveshaft... is any of this clearing things up? the cars are factory race cars with all of the right ingredients. the only thing they need to compete with & beat a car 35 years newer is a remotely similar power number and updated tire.
Safety Car
Joined: Sep 2001
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From: Glenbeulah Wi
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Le Mans Master
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From: St. Charles MO
Yeah, it's not about "torque," it's about power (which damn sure can be directly measured) and traction. The C4 was light with a good-hooking rear suspension and big (for the time) sticky tires, and the automatics generally came with a torque converter that was relatively loose and allowed a good launch. But a 0-60 in the mid 5s isn't all the quick/fast in today's world. The C8 does it in about 2.8s.
Le Mans Master
Joined: Dec 2004
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Yeah, it's not about "torque," it's about power (which damn sure can be directly measured) and traction. The C4 was light with a good-hooking rear suspension and big (for the time) sticky tires, and the automatics generally came with a torque converter that was relatively loose and allowed a good launch. But a 0-60 in the mid 5s isn't all the quick/fast in today's world. The C8 does it in about 2.8s.
The car is really quick and it’s boring, I got tired of mine and sold it. Launch control and an automatic trans 🤢
Le Mans Master
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From: St. Charles MO
I'm not sure how this helps answer the OP's question.
Le Mans Master
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Le Mans Master
Joined: Aug 2015
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From: St. Charles MO
He asked why C4s are so quick from 0-60mph. Part of my reply to him is that they aren't especially quick for their weight or power: they run like we would expect a 240hp RWD car weighing 3200lb and with close to 50/50 weight bias and fat/sticky tires would. A quick perusal of Motor Trend's list of 0-60 times will point out that a ton of cars with similar weight/power are similarly quick, including a legion of FWD four-bangers. I should have led with that, but my point with the C8 is that quick cars these days do the deed in half the time. It's irrelevant whether you think they are exciting/interesting or not.
Le Mans Master
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From: St. Charles MO
It depends on the year/engine/transmission/axle. I'm sure no 2-valve (L98/LT1/LT4) C4 could run 60mph in first. A 96 LT4 (came with the ZF6 manual trans only and 3.45 axle ratio) was good for 53mph in 1st at its 6400rpm redline. A 93+ LT1 (5500rpm redline) with base 2.59 axle and A4 with 3.06 1st gear could also hit 53mph in 1st gear. I think those were the highest 1st-gear top speeds for any 2-valve C4. The ZR1 with the ZF6 and rear gear but a 7100rpm redline (I think?) gets really, really close: 58.45mph in 1st gear.
All of that's academic, though, because if you really wanted to get the best 0-60 time you wouldn't gear the car this tall at all. You'd probably aim to nearly max out 2nd gear just over 60mph in order to maximize average power over the speed interval.
All of that's academic, though, because if you really wanted to get the best 0-60 time you wouldn't gear the car this tall at all. You'd probably aim to nearly max out 2nd gear just over 60mph in order to maximize average power over the speed interval.
Instructor
Joined: Jan 2021
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It depends on the year/engine/transmission/axle. I'm sure no 2-valve (L98/LT1/LT4) C4 could run 60mph in first. A 96 LT4 (came with the ZF6 manual trans only and 3.45 axle ratio) was good for 53mph in 1st at its 6400rpm redline. A 93+ LT1 (5500rpm redline) with base 2.59 axle and A4 with 3.06 1st gear could also hit 53mph in 1st gear. I think those were the highest 1st-gear top speeds for any 2-valve C4. The ZR1 with the ZF6 and rear gear but a 7100rpm redline (I think?) gets really, really close: 58.45mph in 1st gear.
All of that's academic, though, because if you really wanted to get the best 0-60 time you wouldn't gear the car this tall at all. You'd probably aim to nearly max out 2nd gear just over 60mph in order to maximize average power over the speed interval.
All of that's academic, though, because if you really wanted to get the best 0-60 time you wouldn't gear the car this tall at all. You'd probably aim to nearly max out 2nd gear just over 60mph in order to maximize average power over the speed interval.
I'm hitting 60 right around 4500 rpm in 2nd when the motor is starting to run out of air.
Technically yeah, you can go a little faster by extending out in to the RPM band, but its really out of air not much above 60.
Le Mans Master
Joined: Aug 2015
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From: St. Charles MO
Which for the record, is pretty damn close to what the 4+3 cars are geared at.
I'm hitting 60 right around 4500 rpm in 2nd when the motor is starting to run out of air.
Technically yeah, you can go a little faster by extending out in to the RPM band, but its really out of air not much above 60.
I'm hitting 60 right around 4500 rpm in 2nd when the motor is starting to run out of air.
Technically yeah, you can go a little faster by extending out in to the RPM band, but its really out of air not much above 60.