75 L-48 Top speed?
Thread Starter
Instructor
Joined: Aug 2009
Posts: 147
Likes: 2
From: Colorado Springs Colorado
75 L-48 Top speed?
So I've had the car for at least a month now and I was doing some thinking on the road. I decided to test just how fast I could get the car to go at WOT..... needless to say I was impressed yet disappointed. I seen some threads where people were saying that at WOT they are up in the 5500 range, I know i was under 110 with the pedal pegged down, and
I was only hitting the 4400 but under 5k range on the tach, is that normal? Whats the top speed of a stock L-48 and what is the tach numbers showing at that speed.
I also think, I could "feel" some I guess chattering is the term coming from the rear (below me) but it could have been road noise, I guess I should check the diff fluid. and the rear end in general
Swift
I was only hitting the 4400 but under 5k range on the tach, is that normal? Whats the top speed of a stock L-48 and what is the tach numbers showing at that speed.
I also think, I could "feel" some I guess chattering is the term coming from the rear (below me) but it could have been road noise, I guess I should check the diff fluid. and the rear end in general
Swift
Thread Starter
Instructor
Joined: Aug 2009
Posts: 147
Likes: 2
From: Colorado Springs Colorado
my 90 and 01 Accords hit 120 before the governor kicked and prevented them from going higher..... obviously they rev'd higher.... and the worst part is, I've gotten my 98 Golf.... ya a POS GOLF, up to 115ish it was screamin.... I guess I'll live with the under 120 until I get time / money for some mods. I was just curious if any else has had the same experience or any numbers similar.
First things first, fix the brakes, there a pull to the left when braking and I thought maybe some Wilwoods would be a good investment and lighten "Jenny" up a bit.
Thread Starter
Instructor
Joined: Aug 2009
Posts: 147
Likes: 2
From: Colorado Springs Colorado
it was pretty much uninformative, but I've grown up around sarcastic people and I've noticed that the 75 gets looked down on, and well with L48 people seem to cringe about it.
I for one don't really care what people say or think about my C3, because thats what it is a C3, even if its crippled. At least I don't have to smog it in Cali, because then it really would have been a bad deal. I do however have alot of people complimenting me on the car and just simply the fact that its a C3 corvette.
Swift
I for one don't really care what people say or think about my C3, because thats what it is a C3, even if its crippled. At least I don't have to smog it in Cali, because then it really would have been a bad deal. I do however have alot of people complimenting me on the car and just simply the fact that its a C3 corvette.
Swift
Thread Starter
Instructor
Joined: Aug 2009
Posts: 147
Likes: 2
From: Colorado Springs Colorado
LoL, well I already found my top end, with an L48 and 3 speed auto... at least I can say it got there pretty quick so it wasn't all that bad, just disappointing there wasn't any more scrumph left, well at least not any more pedal to push down, I guess i could remove that carpet cover to check if that was stopping it My question was also see if maybe the pedal has been so its at the end of its play.
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Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
C & D timed the 75 L-48 at 129 mph.
Cars tested several 73 models
Cars tested several 73 models
Originally Posted by Cars
Our choice for the all round best performer must go to the base 350 L-48 engine.... quiet, runs cool, idles smoothly & can cruise at 100 all day if you comute in Nevada.
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
Originally Posted by Swift_C3
I was only hitting the 4400 but under 5k range on the tach, is that normal?
Of course the Car & Driver L48 was new & there were optional rear gears.
I checked later to see if was online, but got this 75 comparison which includes 129 mph.
http://www.caranddriver.com/reviews/...ertrain_page_5
Thread Starter
Instructor
Joined: Aug 2009
Posts: 147
Likes: 2
From: Colorado Springs Colorado
well I do have some plans for future upgrades and mods, but safety first, which means, brakes -> suspension -> steering -> Trans / driveline -> engine... lots of sweat and blood to be spilled and a bank account to empty.
Burning Brakes
Joined: Feb 2006
Posts: 1,223
Likes: 4
From: Regina Saskatchewan
with 3.55 gears I used to do 67mph at 3000rpm
Thats 22.3mph for every 1000 rpm.
So at 4400 rpm you'd be doing 4.4 X22.3 = 98 mph.
I'm sure the car can rev to 5000rpm or112 mph.
I pulled the TH350 out and put the 700R overdrive tranny in.
Thats 30mph for every 1000 rpm.
And with a little engine tweeking .... 5000 rpm =
..... a $500 ticket.
Luckily I've never gone that fast.
Thats 22.3mph for every 1000 rpm.
So at 4400 rpm you'd be doing 4.4 X22.3 = 98 mph.
I'm sure the car can rev to 5000rpm or112 mph.
I pulled the TH350 out and put the 700R overdrive tranny in.
Thats 30mph for every 1000 rpm.
And with a little engine tweeking .... 5000 rpm =
..... a $500 ticket.
Luckily I've never gone that fast.
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
In '79 I was able to top out my '77 L-48 with automatic at about 125. A friend in Mobile at the time installed 1969 side pipes on his '77 L-48 automatic and went from 125 to 130 top end.
GUSTO
GUSTO
Le Mans Master
Joined: Jul 2009
Posts: 6,647
Likes: 1
From: East Aurora N.Y.
St. Jude Donor '10
...Sure !
