Doward

I'm calculating mine off the RPM reading from WinALDL - my tach is 300 rpm slow (aka reads 4500 when I'm doing 4200)

vsixtoy

I question the accuracy of my tach also. It is impossible to judge speed at that level. I really doubt mine is on the slower side thought, I really don't think this motor can push this car past 140. I was on a downhill grade through Diamondbar Calif doing the 138.7mph. I have comfirmed the 123.3 on California Speedway bank turn 1&2 with a GPS sitting on the floorboard behind my seat. That was the fastest section of the course (end of the front straight into turn 1/2 bank and then 1/3 way down the back straight we turn infeild for the roadcourse- 2.8mile course). When I was running the bank in Drive(I keep in locked down out of OD when I have taken it out there) I was just pushing past 5000 rpms. Equations factor 123.3 at 5200 so I have to be fairly close on accuracy, but I could be 100 or 200 rpms off.

ScrapMaker

why / how would the tach be off, and NOT the computer reading of it from the dist? Isn't the tach basically a pulse-reading sensor? like all the other guages they seem to be digital somehow... like the speedometer does some weird stuff sometimes... like jump to 0 and jump back and forth and stuff... dunno... would the tach reading be off because of the tach or because or where it reads it from?

camaro_junkie

I would have to say it is the tach itself. The ECM must know how often it is firing the spark or else the car would not run very well at all.

BitchinRS

I can say with confidence tha the tach is off. My tach shows that I idle at 1 grand warm 1500 cold. Last smog check the computer read out showed that I was idling warm at 873RPM. I gueess you can say it is a tad off.

nsimmons

Question. How long are you guys on the throttle to get to these speeds? I had an 84 and an 87 2.8.

I buried the 87 once and it took a LONG time to max out.

My car now with the gearing will redline in 5th in about 30 seconds from a stand still. No idea how fast with the 85mph speedo and Im not doing that again.

slim84maro

i have a 84 camaro with the 85mph spedo. i get it past the 85 alot. ive had it about 3/4 completly around with od still to go. i think i was going 120 or 125. im pretty sure if i had a long straight road and got it toped out in drive then went into od and kept going i could get it to 150 maybe 160 because thats as far as the needle goes then it hits the little button thing to the miles. the needle in my ar has already broke of from hitting that thing when the last owner had it and with a differenet motor in it that he spun a rod with. o yeah my car is a 305 btw carbureted. no computer

AM91Camaro_RS

the speedo needle doesn't have enough pressure to break from hitting one of the stoppers on the guage. and, you will not go into OD at WOT, the tranny won't allow it, unless you have a special built tranny. probably not though.

ScrapMaker

OD wouldn't help anyways... everything I've heard is that OD has the same exact overall ratio of speed output... its just easier on the car but you can't get any more speed out of od... guess I could be wrong but I've been told be several people up to now.

and to add to you guys randomly guessing how fast you're going... my speedometer is exactly 15% under the correct speed... If I have gotten the guage to 110, what does that mean?
126.5mph... wee I can guess too!

AM91Camaro_RS

OD in an auto tranny, well, the 700r4 tranny, has a ratio of .70:1. that means that the driveshaft rotates one time for every .7 rotations of the engine. that varies directly with speed. Drive has a ratio of 1:1. this means that the engine and driveshaft are running the same rpm (except when the torque convertor is not locked up). so, in OD, the driveshaft rotates more times than the engine so you will go faster. however, 700r4 trannies will not shift into OD past, i believe, 70% throttle pressure unless the tranny is built to do so, internally.

ScrapMaker

is the tranny always locked in OD? or can the ratio slip all the way to 1:1?

also, if you were to have your tranny rebuilt, would it be worth it to ask them to make the tranny capable of sticking in od at wot?

AM91Camaro_RS

no, the convertor doesn't lock up as soon as it goes into OD nor does it always stay locked while the tranny is in OD. you can put a lock-up switch on it though so that you can make it lock up.

if you really need to have OD available for running WOT, it is worth it. however, you have to make sure that it is built to upshift to OD (4th) while running WOT...not just having it setup to stay in OD at WOT from a roll. in other words, have it built to where it will upshift at WOT and not, NOT downshift out of OD. see what i'm saying? i have heard though, atleast with one setup for this that the tranny will not automatically downshift to 3rd for passing just from throttle pressure, you have to downshift it manually. while this isn't too big of a deal, you just have to be careful doing it.

slim84maro

theres this thing jegs had for 700r4 trans's. it keeps you in overdrive when the peddle is still 85% of the way down. instead of 50%. police cars use them for high speed pursuits

rx7speed

for a 6 I doubt you would have hit 150-160 mph
not unless your cars are highly modded
and for quite a few of you your speeds seem a little high

granted my car isn't some speed demon either but there are a few things going in my favor vs you guys
better gearing
better Coefficient of drag
less frontal area all making for better aerodynamics
tad more hp and It wouldn't shock me if less drivetrain loss but don't me to that. and a better torque curve then what you have and for me to hit some of the speeds you guys claim takes quite some time or a downhill slope if I can hit it at all
not going to say it won't happen but find it hard to believe

slim84maro

ive been in a 2000 corolla and we topped it out at 120 then hit rev limiter just after. it didnt take that long to get to that speed. but my v8 def does it quicker. the new pontiac firebirds can handle speeds up to 180 then start to feel loose. o wait this is about v6's. mybad. i think those can get to like 140 maybe. but positive that they can hit 120+ some.

ScrapMaker

it takes FOREVER to hit those speeds on a straight-away


30+ I reckon

GreyFox

ok welp the fastest i have had my firebird is 105 but that was becasue i backed off (had to many tickets here in va and currently still on probation type for one until feb)...... however i know for a fact that i have no limiter do to a aftermarket chip, fastest i have gone in a car is 130 in a 2.3l 86 mustang i had a couple years ago (was keeping pace with a friend late one night, wanted to prove his newer ***** was no better than my older american car)

right now i kep my car running between 80-90 for most of the ride home from work does it just fine work is about 20 mi from home, sometimes i hit 100 but something is up i just can't bring myself to go that fast on the highway anymore

ScrapMaker

I don't know about you guys, but do you run about 2200rpms at 75'ish mph?

GreyFox

yep sure do, thank your gm for the 700r4 trans, od is a gas saver i love it, can't say anymore about it

coolrimsatleast

Max speed for my car in rain is 95mph. The wind starts to force it's way under the wipers and they quit removing the water, making it hard to see. ( I only did that once in germany. I don't do that anymore over here)

Sometimes it felt like the speed limiter was kicking in (would barely reach 120) other times it ran fine past 115 up to 125.

Mr. TurboTA

Well,
I've had my little V-6 to way over 140 mph! Like an inch and a half below the 140 mark too!
Granted, it has a big old turbo on it, and no rev limiter, she flys!
And before anyone starts talking about the car mags stating only 150 or so, check it out yourselfs!
At Indy, in 1989, the officials clocked the Indy Pace Cars at 172 mph! Granted, the straightaway there is over a mile long, while the car mags test less than a mile.
Now, I did this within the first year of ownership, with the car fairly still new, I don't think I'd attempt that same speed now!
I'm older now, and there are way more stupid people out on the roads!
Now, maybe I'll go to the Silver State Classic someday!

No one said anything about turbo'ed V-6s in this tread.

Later,

George

1BADDAM

116mph...............................................in the 1/4


Hey George, did your side windows suck out at around 140-145 ?

Mine did, scared the hell out of me for a second. I imagine this wouldn't happen with a hard top car, POS lexan.

Mr. TurboTA

Nope!
Not at all!
It was a beautiful quiet night on the I5, coming down from San Francisco, to Los Angeles!
Like I said, the car was still fairly new.
Nothing was said about the windows at Indy, when they were testing them, or, in the race either!
Makes you wonder though!
Lately, the car has just been up to 135!
How fast have you gotten your car? Anything off the track?

Later,

George

1BADDAM

Back in 90-91' tried to do a little freeway top end run with a friend. He had a blown 88 Vette with a ZF 6 speed. We started at about a 60 roll, I started pulling him about 125-130. What fun, speedo had been past 140 for a few, when we finally started to run into a few cars and got out of it. Friend in the Vette said he was at 155 when he got out of it.

At the time, car had race chip, no cat, running 20 #'s on 100 octane. Sure would like to do it now since the Scanmaster will show mph past 140, just to many cars on the road at 3 am now.

vsixtoy

Off the 15? I had my truck through the canyons headinng south towards Temecula about 1 month ago at mid day and mid week (three lane section) and it was wide open enough for me to cruise through there at 120 for about 30sec at that speed That freeway is constantly wide open. I cruise most of it at about 95 from the 91 to temecula (whats that, 12-15miles?)

1BADDAM

more like 20-25 miles. Yeh I joined in on a race between a mustang and camaro on that stretch about 4 yrs ago. Yeh it is wide open in some spots and it has some long straights. Its more than just a few stragglers on the road at that hour that I worry about, its getting caught.

TomP

I put that in years ago; made by B&M, "4-3 kickdown kit"- well worth the money. But I got mine from Summit Racing because the guys at Jegs are a bunch of ******. It's easy to put in; you can do it the next time you change your trans fluid and filter. The TV sleeve is easy to pull out; you don't even have to drop the valve body!

Police cars use the 3-4 WOT Upshift kit, it's a GM-made kit that came in the B4C (RPO code for Police Package) Camaros and the Corvettes (and, of course, Police Caprices). The B&M 4-3 kickdown kit is just a new sleeve for the TV valve. The GM kit comes with quite a few parts and is harder to install.

The B&M Kit will lock you into OD on the highway; so if you have to pass someone, you need to use the stick. Of course you could smash the gas all the way to floorboard and it'll downshift, but why rev the motor all the way up just to pass a slowpoke? The faster you go, the more the trans "resists" downshifting. Example, when I go 45 mph, the trans will downshift if I press the gas down about halfway. But if I'm doing 70 mph, I'd have to push the gas down all the way for it to downshift.

Plus it's more fun (for me) to row my own anyway.

ScrapMaker

how much does something like this cost?

slim84maro

about $50 i think give or take a few. i dont remember i lost my mag with it in it. but yeah that od doesnt help too much when you got 3.73's in the rear. thats why i get bad gas milage on the highway.

ScrapMaker

have you thought about adding a gear benders overdrive to your car? I'm not sure but I hear you can get them in many different ratios...

goes between tranny and rear-end I believe...

I always thought it would be awesome to have a dual-speed rear-end... like a high-low like on really crappy cars...

one gear ratio where the car cant even go over 50-60mph... maybe could make our v6's a tad quicker... and then the other setting could be a gas-saving setting...

hell, if there were 3 settings, then you could have drag-mode/normal/cheapbastard.... dunno I just always like the idea of something like that (I know the gearbender is only on or off)

nsimmons

Im watching futurama and found that pretty funny

its called a gear vendor not bender

Gumby

I know a guy wit ha NIB gear vendor. Its the low profile sump, he paid $1400 6 months ago. he is sell it for $1000. it bolts onto the end of the tranny and sometime requires some floor work. it a low profile towards the ground but stick up some.

redraif

What have the 3.73s done to your gas mileage? I think I'm at about 10 MPG now...though I have to factor in the 19lb injectors and the lack of tuning & I think I have another issue. Car has been coding for a lean condition. Both code 22 (o2) and 44 (TPS). Replaced o2 and checked TPS (on the $), last weekend. Oddly its still coding so not sure about the codes. New computer and prom in the car, so its not them! Still getting them though at idle. Car is definately running rich, per the sniff test! Planing to check it out in a few days with a fuel pressure gauge.

ScrapMaker

what kinda of 0-60 and 1/4 mile times do you get with a "highly modded" 3.4 w/ 3.73s?

redraif

Mine: 3.4 with auto, shift kit, stall convertor, and 3.73 gears
Weight: 3555 without me in it... (heavy)

Dyno...
Max Power = 134.1 @ rear wheels (+20%) = 160.92hp @ the fly wheel
Max Torque = 207.4 @ rear wheels (+20%) = 248.88ft-lbs @ the fly wheel

Runs 16.8 in the 1/4...NO traction and tranny hanging up...not shifting...hitting rev limiter about 3/4 way down track...not tuned...

Tranny fixed now...also have a line on some drag tires so I can get it over to an 1/8 mile track

Just thought of something to get a better idea what the car was running that day...The tranny issue was only affecting the run I believe past the 1/8th mile. So I decided to look at what my 1/8 mile time was. Then I used the NHRA sanctioned 1/8 conversion rate (1.538) to see what the car would have run in the 1/4 mile, if the tranny had not hung up.

If I take the best 1/8 mile time (10.64) from the timeslips that day and do the conversion...
16.36 in the 1/4...
But still that is with no traction.

SSC

96, 3.4L Camaro rebuid and modded by yours truely. 115 MPH 3800 RPM in 5th, maxed out 4400 RPM. Yea its 4thgen but still thats hauling. 76 chevy C10, 2900 = 75 MPH, had it near floord 5500 RPM, it sounded and felt like the truck was about to fall apart. 82 firbird 120 MPH still havent got the driveline ballanced. 85 Z28 my car that got rear ended, 145 MPH lost a T Top and nearly went off the road when it poped off. yes I did **** my pants.

vsixtoy

Car- '68 Vette- 165+mph (thats being conservative)
Truck- '89 Chev 1/2ton- 140mph
Motorcycle- '89 Suzuki GSXR 750 ( Vance & Hines built motor and gearbox, bike lighted about 75lbs from stock)- 152mph (lets just say I new where the 150mph mark was and I know the needle was past it- It would be too hard to read otherwise from vibration)
3rd gen- 138.7
GoKart- 80+mph (At a private track in Puerto Vallarta)
Wheelie on motorcycle- 110mph (was when I finally set the front wheel down, I would pick it up at 45mph)
Snow Skis- Volkl P9 217cm- 80mph

And if all this doesn't impress any of you, My twin brother has been just shy of Mach 2 in an F-111 overseas out over the Mediteranian Sea)
My sister -in-law is the only one in the family to have been over 200. She ran 202mph in her fathers rail back in the early 70's at Lyon's Dragstrip. She has bragging rights in the family.

305q_ta86

iTrader: (1)

I just read this thread now.. I cant believe your headlighs flip up.

I hit 100 in my v6 once, but the lights were already up, and I was only on it about 3/4 of the way.


But then I had to back off...

ScrapMaker

huh? My headlights never pop up, and I even drove to about 120mph with the windows down.... never lost a t-top, never felt like the car was gonna crash.... I slowed down because I was on this long shortcut between Austin and San Antonio, and it's kinda dangerous (physicaly and police-ically) -- and I personally don't want to go off the road in a rural area and burn alive in a raging inferno... (if the impact didn't fix you first)

camaro69_91RS

91 RS , stock 3.1 with exception of exhaust , speedo goes to 110 and does it faily easily with enough road. Guessing could get to around 115 - 120 stock , know the 92 firebird got my gf with the 3.1 has 120 speedo and itll do it , thats why im guessing around 120 but firebird will do little more , not much... but never a problem with headlights or car wanting to lift. may want to check and see if your headlight motors are going out. Also dont know about the car lifting , gf's firebirds lowered 2" over stock so the factory ride height may be letting to much air pass under the car causing it to lift. Wing should help counter that not add to it.

ScrapMaker

the wings on our cars aren't real.... I don't think they do much of anything... I guess they do *something* but they are so small and I figured they were just for looks

Gumby

30+ miles to top out???

I just noticed the post.

Azrael91966669

well my 91 rs has no problem getting past the 115 speedo

ive also never had the 4/3 down shift problem
step on the gas around 90 it drops into o/d
90mph

ScrapMaker

nope I mean like 30 seconds... prolly a tad bit more.. like 30-45seconds to reach those speeds... pretty slow if you ask me

Cyberpope

From a technical drawing I saw a while back on the web, which I am trying to find again, it said that the spoiler used on the camaro gave about 5lbs of downforce, while the z28 style wing gave about 15.

vsixtoy

5-15lbs downforce doesn't do squat (pun intended- I crack myself up). You need to factor more like 200+ lbs of downforce to make a handleing difference and you'd better have the spring rate to handle the added downforce at speed. F1cars can glue themselves to the roof of a wind tunnel at 120mph- thats about 1800# of downforce. Ever wonder why one oof those cars looks like a 4x4 standing still, they compress greatly at speed.

Cyberpope

Well they might not work well, but they still work. Even if its worth about the same downforce as sticking your hand out the window.

vsixtoy

I am not saying you don't need them. They are in fact designed to keep the car as close to neutral as possible at speed (erring more on the downforce side for safety) to keep the car from lifting from air going under it and going loose feeling. So don't take them off.

ScrapMaker

don't forget, our cars look like @ss without spoilers... that's the #1 reason not to remove them

camaro_junkie

Even the short 3-piece (the one that doesn't stand off the back like I have) makes a huge difference in the way the car looks. And I agree with vsixtoy. Although they do help a small amount you need downforce in the hundreds of pounds to be really effective. IF losing grip in the snow is AT ALL comparable to losing grip at high speeds... you need 100+ pounds to gain any sort of grip in the snow.