my friend was in his 04 750 gixxer on a state road late at night with me, he pulled up next to me and i floored it to find my top speed (speedo goes up to 85mph ) anyway, i was in 3rd at 6k and i shifted into overdrive, i drove it in o.d. until i got up to 4500 rpms, when we pulled over to go to dennys, I was informed that the bike was topped out at 170. Now he had a sproket on there, which made it off 10mph, so I was hittin in excess of 150mph with 3.73's!

 

no you weren't

 

3.73's on a auto?

what all is done to that zz4? i dont think you could hit that with out being high 5000 rpms.

 

Buy/barrow a GPS, my speedo read 129 and I got clocked at 116, they get really inaccurate over 100mph

 

 

My speedo always reads at least 5 miles an hour higher than I'm really going when I go through the traps. Even when I was trapping at only 80 mph, and then when I was trapping at 105-106 mph it was always 5 off.

 

I have heard that Camaros disintegrate at 150 MPH, or maybe it something about time travel at that speed...

Either way, you wouldn't be here if you went 150...

 

Find a gear calculator on the internet. 26" tires and 5000 rpm and 3.73 gears and .7 overdrive =148mph

 

at sealevel,

 

26" tires on the day you get them put on. I wonder how big the error margin actually is?

 

???

 

Here's the gear calculator link. http://www.f-body.org/gears/

 

stock driveshaft aint safe above 130 i hear... your risking alot at those speeds


does that gear calculator take into account aerodynamic drag at speed?

 

Those formulas assume your engine is powerfull enough to get you to that speed. Friction and air drag will not change that number.

 

but its true that you need like 80hp to sustain some speed X and another 200hp to push away the air, or something like that

how do you find out how much power it takes to reach the calculated speed?

to me, i think a 174 mph run would need 450hp on crank to push a thirdgen into that realm, but not with 3.73's LOL

 

Yes you are right. The top speed calculator assumes the engine can provide that rpm at X values for the calculation. Many factors will keep the engine from reaching that RPM at those speeds. Those factors are air resistance, drivetrain loss, and basic all around friction. There are many models out there that will tell you what you need based on all that jazz. I have a few of them that I could run some numbers.

 

I can hardly believe you were actually going 150. I have had one of my IROC's up to 130mph one time. It gets pretty damn scary up there. Unless your car is just built for it, your car would have been shaking somethin fierce, almost uncontrollably at that speed. Not to mention what would have happened if you had hit even a pebble in the road going that fast...

 

alum. driveshaft

 

Dude, the Gixxer speedo read 160, and it has a sproket on it thats it. so i was doing 150. the ****in tires started to wear funny and they are falling apart somewhat. The 700R4 is professionaly built with different gears in it. (asked father, i know nothing of what tranny shop did to tranny) I truly believe i was going that fast, because in my 03' stang GT i got it to 135 with the AC on easy. Its hyperteched tuned with a K&N. As far as my car is concerned, its a zz4 motor, with a lil more cam, bigger rockers, and worked heads. Its somewhere in the 400+hp range. The car was shaking alot, but it was on a smooth road, i had a brand new suspension and drivetrain (struts, shocks, lca's, alm driveshaft). I dont have a Gps for it, but im sure if i did that again that it would hit 150. You also have to keep in mind that it took it a while to climb to that after 100mph was hit. so i didnt just get there at the snap of a finger, if you know what i mean.

Edit: im at sealevel by the way, lol.

 

I don't understand why everyone automatically disbelieves someone who says they have gone up and around 150???? I have had the needle pegged above the 145 mark in my '91 Z several times. The car should not shake at those speeds as long as everything is balanced and installed correctly. I agree that the speedo's may be off a little, but not THAT much. The speedo in my car is electric sender, so there will be no warping of the cable or gear problems.
Putting a sprocket on a bike is like changing gears in a car. It is not going to make your speedometer off a set speed (10mph) throughout the RPM band. It will make the speedo read incorrectly based on the percentage difference from the original gearing. Basically, his bike isn't going to be off 10 mph while he is riding 10 mph and be 10 mph off while he is doing 170. His bike is going to be more and more inaccurate at higher rpm ranges as he shifts thru the gears, but there will be a point in there where it may be 10 mph off...
When it's all said and done, 150 is very attainable. You just need the right parts to get you there. My goal is to get a full bodied 3rd Gen Camaro over the 200mph mark......:rockon:
No BS, just pure American Horse Power and the cajones to do it.

P.S. I've got several friends who are cops. Some day soon I will have proof that a 3rd gen can scream past the 150 mark with ease. I hope pics will be proof enough....

 

its possible for sure. 150 aint hard at all, but with auto 700r4 and 3.73's, your gonna need some ***** to get it up there. not sure, but if your tranny allows you to go WOT in overdrive, then it can be possible

 

thats partly due to your mph at the traps is based upon the avg mph through like the last 10feet rather then your true mph at the end

 

like tire wear?


also who is to say how accurate the tach is and would the converter even lock up at those speeds at wot or would it let teh converter slip a little

 

:werd:
I just can't wait to see the thread I post when I put mine over 200. NO ONE is gonna believe it. Unlike Steve and his Gixer friend, I'm gonna have pics and video....

 

While his math sounds off with 3.73's, a stock L98 with in good running order should be able to top 150mph no problem. My GTA when stock didn't have much trouble getting to 140, though I always backed off before I ran out of luck. Something about peggig a 140mph speedo that both scares and excites me.

The new motor has seen 140mph in 3rd with 3.27's no problem. hits it pretty damn quick turning about 6,100rpm. I would love to see what it could do with full throttle in overdrive. But I can only give it about 2/3rd throttle, same as just about any other 700r4. When I installed my transgo shift kit, vette servo, and boost valve I didn't install the GM B4C upshift valve, kinda wish I did now.

3.27's, 245/50/16 tires, and a 1:1 tranny ratio = about 6100-6200rpm for 140mph. The intake is a pretty heavy breathing TPI setup. AS&M SS runners, ported/siamesed plenum, ported base, ported heads, 211/219 cam, headers, full exhaust. If I had some nice aftermarket heads there'd be more to have. But it was my first attempt at porting everything.

 

we calculated that it would make it off 10mph at that speed for the sproket.

 

Definitely do-able.

L69 engine 3.73 gears:

decent cam

dual plane intake

1 5/8" headers and 3" exhaust

235/60/15 tires

and of course, K & N air filter

trans goes WOT in 4th, converter locked.

Tops of windows suck out at 135, 150 at 5000 rpm with accurate tach on long flat road. For reference car ran best of 14.1 @ 99mph in 1/4.

 

stupid queston but why is a 4th gen alot smoother at 155 than a third gen?? Looks like a good IROC could run that fast without shaking like they do. I've had my 87 up to 120 a couple of times but that was about all I could push it.

 

Upgrade suspension and get a good alignment balanced tires. Should be smooth even at higher speeds.

 

motor trend did a test of several cars top speed for 1988. the auto iroc pulled 148mph. the gta did 141mph. heres the link......
http://www.gtasourcepage.com/88MTTopSpeed10.html
my gta in bone stock condition made 229rwhp and 328rwtq. thats what i would consider high for an l98, and to be able to go 141mph on 229rwhp is good. btw thirdgen89gta, your car came stock with a "vette servo".

 

Just take it somewhere and get it clocked, and then you'll know for certain.

And according to that calculator, mine would top out at 165, but there is no way it would EVERg get to redline in 4th as it currently is. Especially because it wont shift into 4th at WOT.

 

I had my car pegged at 145 once...................................once

 

LS1 cars yes, LT1 cars not really. The later years had balanced driveshafts. My LT1 shakes somthing feirce at 130.

It is not safe to hold high speeds like that. Even Z rated tires are only desinged to hit that mph for a short period of time. Most of you don't have tires rated past 130mph. I would not want to risk my life like that.

 

So I'm starring at the front end of our 84 Z-28 Camaro Mustang Challenge car and I notice that there are two medium size and one big gapping hole In the front end of that car. Now the the Two head light pockets Create a lot of drag. not to mention how much pressure it puts on that hood. This can be fixed with a pair of lexan covers. I have a couple on my car. Put them on and got 2 miles to the gallon better gas mileage. So it makes a difference. Also what about all the air that gets stuck under that front end. Unless you have that front end sucked to the ground you should be getting some considerable lift on that nose. If you put some sort of front valence that brought that lower edge of the bumper to within an 1 of the ground there should be some serious trouble getting that fast. And like that one guy said. The tires will give out. And if this isn't the case then you will need to give your formula to the nextel cup teams so that they could pull off faster speeds.

 

I have an 89 IRoc with the L98. I ahve the 700R4 but with the 2.77 rear end. That gear calculator is exactly accurate with 1st and second gear. It says my thirdgear will go to 151mph. And i know from experience that topped out in 3rd gear in my car at 5500rpm it will go about 150. the spedometer was past 145 and my spedometer reads low starting at 50mph. when it says you are going 50 you are really going 52. At 70mph on the spedometer you are really ging 76. So i know the car will go that fast without this disinteregrating of the car.

 

wow, 3rd gear and your doing 145+? cool. mine is exact same as yours, 89 L98, 2.77's for now, (3.27's going in spring) and i was cruising 130 in OD once. had alot of rpms to go yet so i figured 150mph tops


i trapped 96 at the track and my speedo was reading 96, so i guess my speedo is very accurate

 

My stock gta sits at 3 grand in 4th at 100mph i tokk it up to about 137 mph one time and she was pretty unstable

 

I had no problems when I hit 140mph that night. It was pretty solid. I don't know why some cars using the same body and suspension have different results at speed.

 

Well my tires arent balanced and i have a different set on front i also have t tops which seems to loosen the car up a little, it wasnt dangerously unstable but it could have been a little better.

 

First off, I pray to *** that you had some Z or at least H rated tires on the car, otherwise you'd have to be on some serious mind alterring drugs to pull that off. I'm sure that the car just didn't zip right up to 150, so that meant you were spending awhile over 125 trying to get there. You are very lucky a tire didn't come apart. Secondly, alittle duct tape, some aluminum and pop rivets along with removing the rear spoiler will really help things out, or so I've heard

 

Yes i had Z-Rated tires on. And the speed rating is the speed at which is can maintain that speed without breaking up. It isnt the speed it can only maintain for a short time. Example. you can take a 110mph rated tired faster than 110 for a short time and it is fine.

 

I read an article about a 3rd Gen Camaro that went 165+ after a motor swap - guy was rigging the car up for top-speed stuff, not for street daily driver use. Used an aerofin off a GTA (so I know they functional!), shaved his mirrors, put covers over his lights, and lowered the car a bit. Then he dumped a bounch of time and effort into the suspension and got it to hit 187 or something lke that. I'll have to find the article link and post it.

 

I personally wouldnt want to go 150 mph cept on the drag strip but if u did on the highway...props

 

That would be cool if you found it. I want to have the first streetable 3rd gen that can cruise at over 200mph. Anyone think it can be done???? I'm willing to give it a shot. I have an '87 Z28 that's just begging to do it!!!!!

 

your in boise?

 

Well I'm from Boise, but I'm stationed at Fort Bragg, NC for now. Hopefully coming home soon.

 

Too late, Pontiac already built one. Twin Turbo 350 that topped 200mph+ in a speed test. 605hp and 700lb/ft torque.http://www.yearone.com/enthusiast/ar...et/blueta.html




Granted, you could be the first person to do it around you. But it would be cool to have a 200mph bird. Not too hard, they are VERY stable at high speeds with the 85-90 package. The front end provides some nasty downforce, and the GTA aerospoiler is damn effective.

 

nice I'm over here in cadlwell


but work over in boise at qwest

 

hot rod i believe had a car hit 225 at the salt flats

moon disc wheels, very skinny tires, head light pocket covers and slammed with some ground effects. forget the power numbers but i think it was approaching 800hp. forget tho. car went 225 and thats the fastest one i seen yet

 

Fastest stock body bird broke 300mph. And it was the FIRST stock bodied car to ever break the 300mph barrier.