Mcdamit

The cast iron driveshaft on the 1989 Iroc with a 5spd, how many rpms can it spin to before overload. I have heard people say 135mph, but that doesn't help if you dont say tire size, gearing and transmission. Most of the guys are running 2.73, i have the borg warner 3.45's i just wanna know the car's top speed

kevinc

There is no cast iron driveshaft for the 1989 IROC. It's steel.

With a 305 you can't hit the critical speed anyway so don't worry about it.

Mcdamit

yeah you can the car "down a cylinder" has seen 130mph, either way its a pos drive shaft, whats the rpm, it has just has much horse as the 350 and 300lbs. of torque, what's the rpm top out

Mcdamit

and dont doubt the 305's i have seen them whip past ls1's like they were non turboed 4 bangers

kevinc

If you've realized it's a POS why bother researching it? Just score a used aluminum LT1 or LS1 shaft for a hundred bux or so and you're a happy camper.

And I have no doubt whatsoever about the 305's capabilities...

Never ran across a single one back when I had my TPI 350 or now that I have an LS1 that posed a credible threat. I sailed past them like they were...well...305's.

kevinc

This is an interesting statement. If you can bring objective and empirical proof that a 305 "has just as much horse as the 350" it will make the difference between you speaking truth and you posting monkey-spank.

Until that happens, it's monkey spank.

Mcdamit

check the tech data, car has 3.45's

Mcdamit

there is your question, now answer mine. by tech data i mean the horse power ratings in the cover page of this site it has the most complete listing i can find the manual TPI305 came with the corvette/l98 camshaft, which boosts its rating up to 220hp then with dual cats it brought the rating up to 230, and then remeber gm always underates their cars. Mostly for insurance reasons, same reason why the tta which is rated at 250hp is really around 300hp... Also the 3.45 -9bolt/7.75"rear really gives the car a kick in the *** and most guys who mod their 305's cant even get their hp close to the G92's, if i ever race up this car its gettin a radical cam and ported afr's

kevinc

I did. Yours is rated at 230hp/300tq...the L98 same year is rated at 240/345...and it grew to 245/345 in subsequent years.

230<245. How exactly did you arrive at "same horse as 350?" If GM "always underrates their cars" then the L98 is also underrated.

kevinc

Was there a question in there somewhere?

Are you under the impression gears add hp or tq?

And to paraphrase...if you ever race this car its gettin a butt whooping.

Merlin

Werd, dude. The real reason GM had to stop making the 305s is because they made too much power and used too little gas. The oil companies and politicians called GM and said "Stop that."

Mcdamit

89 IROC-Z Formula T/A
A4
L98 V8 9.3:1 5.7 (350)
230@4400 330@3200 TPI 2.77*

230=230
300<330

I never stated that gears =equal power
gears equal acceleration
Also remeber the auto eats a lot more torque than the manual tranny, and so do the 2.73's

You quoted the G92 350 which is rare and far between .

Question was prove that they have equal horse. Personally if you had a G92 350 dual cat car w/ 3.27's then props to you. But they are a hard find especially in stock form.

And i would like to see my *** get whopped by the stock 350 single cat car.

And gm ended the 305 because it was a small cube v-8 centered around gas mileage not performance

kevinc

Gawd, it just became clear what IQ level I'm up against...I surrender.

Mcdamit

tell me that im wrong seriously. would it not be a head to head race or am i just another tard without a paddle, if your car was a single cat with minor tuning those are your numbers.
Then tell me that it had a gazillion horse and torque and how the 302 is the best block in the world even though its the bore, stroke, heads and cam that make a difference. Not friggin lifters and stock "super tiny" headers

ede

kevin it took you a while to cathc on didn't it? i knew where we were and what we were dealing with when i read "cast iron drive shaft" werd

Mcdamit

sorry bout the drive shaft comment, steel and cast parts both equal worthless, and either way it is worthless as far as balancing goes. Now may someone answer my question and close the thread all i wanted was top out rpm. Im not the one who made a comment about someone else's car and or cheaping out and buying a crate engine

Red Devil

Mine's 'stock'.

Idiot. Cast iron? Overload?!? What is it an electrical circuit? You have no problem wasting time posting drivel, why not spend some of that time getting off your *** and looking up some online calculators? Since you apparently know what your car runs at the track, I'm sure you can extrapolate. If you haven't run it then why are you posturing?

And 240>230. I havn't seen too many L98s with the 2.77, but if you are going to compare the better layouts, keep it apples to apples, don't play statistician and pick and choose your numbers. To put it into perspective, RPO figures for the GTAs of 1989...

GM3 -- Rear Axle Ratio (3.45) -- 366
GW6 -- Rear Axle Ratio (3.27) -- 8,104
G80 -- Axle, Rear Limited-Slip -- A
LC2 -- Engine, 3.8L V6 Turbocharged -- 1,550
LB9 -- Engine, 5.0L V8 TPI -- 366
L98 -- Engine, 5.7L V8 TPI -- 6,554

Now go spank a monkey somewhere else.

Mcdamit

sorry bro my english skillz tend to suck especially when i am working on other things, as far as the 350's i have yet to see a 3.27/G92 car around here, either way dont dis the 305 because if you really think about it what is 10 horsepower. the torque i will give in to yes 45ft lbs. is a large difference but so is the 45 cubes.

I am gonna guess and say the ending numbers are production numbers.

The whole reason i have asked is everywhere i see the STEEL driveshaft, it is rated at mph and without the specs of the car it is no help.

Red Devil

I contextually discount the 305 b/c mod for mod the 350 will outperform it -and the 305 has other issues, not the least of which is the shrouding issue.
With the mph you can reverse calculate for each gear. Or you could maybe just write an email to a drive shaft company and creatively ask their opinion. They seem to know what they are talking about generally.

kevinc

You're seriously wrong. And you've done an excellent job of clarifying that last point.

Mcdamit

i completely understand that and hence why i stated stock, a 305 will generally get itself ripped a new hole when running against the modded 350, i understand that it is not capable of running with a 350 in a modded race especially when higher horsepower comes into play. as of now my stock 305 has a rough almost lopey idle and that is from the factory...... I have one more question and anyone can give me an answer, i am building a 305, i was told it was a 350 and found out the hard way. I was given an offer from a ri cer to who wants it for his pickup. My question is how much should i ask. it has 416 heads, aluminum single plane intake manifold, a q-jet and probably a peanut cam, the internals are cast, it is extremely clean and has 10,000 miles on it. ? the engine is a 1980-85 202block. i'll give it too him completely running he needs new gaskets and hoses as i have thrown them all out

kevinc

So...every cast iron crankshaft in every engine can't be balanced? You should call the automakers, they aren't aware of this.

And...steel driveshafts are worthless and cant' be balanced? Better call the <10sec drag racers, they aren't aware of this.

BWAAAAAHAHAHAHAHAHA!!!

Vader

As for your original question, you've already been given the correct answer. Get an aluminum or MMC driveshaft from a 4th gen or 1LE car (or even a later truck) and have it modified to fit your yoke and spline.

Funny how the old steel driveshafts used to be good for a few thousand blown HP and 300 MPH, but only 1/4 mile at a time. I guess the steel metallurgy just isn't as good as it used to be.

Mcdamit

wasn't stating balancing though the concept of balancing is involved in both. I was refering to torque and the ability of the crank to handle power and an poorly balanced rotating assembly, plus would you really wanna put a blower or nitrous in a cast rotating assembly?

As far as the driveshaft you ever break a u joint?

Mcdamit

It was made cheaply thats all, if it was just a regular steel shaft i wouldn't care but one of my friends did snap his but he was lucky, He didn't turn into a catapult.

kevinc

Your original quote was "and either way it is worthless as far as balancing goes. "

That sounds like you were trying to state something about balancing, albeit incorrectly.

Every time you post, you leave another bread-crumb trail of wrong info to follow...this is entertaining!

Mcdamit

glad you enjoy but it did have to do with balancing, because this kid expects to rev the motor like its a 4 banger. Right now his truck has a four banger and a A4, and the 305 should mount into the tranny right, its a chevy i dont know what year, but i know there is a enough clearance for the engine.

I gotta go to work and do my english nite.

Mcdamit

oh yeah Nick if you wanna laugh your *** off for hours, go to 3go and look up my name. The read car pics and more car pics, there is a reason they hate me

SLP IROC-Z

iTrader: (1)

check TPIS, they have somethin on the stock driveshaft and its capabilities for speed.

88tatpi

Well, he did say "horse..." . He didn't say horse- " ?????"

88tatpi

Maybe GM didn't want to make small bore blocks anymore?

Economy of scale?

88tatpi

Air Cav Does NOT, I repeat NOT surrender!!!!!!

Chris89GTA

iTrader: (2)

Bwahahaha... Wow buddy. Wow. Yeah they may underrate these cars... by a few HP... LOL... I had a 89 305 TPI dude... dynoed 175 hp to the wheels!!! WTF are you thinking that these 305 cars can run w/ LS1s

Man LS1 cars are putting 300 to the wheels... You may have a little over half of that... Why don't you kindly remove your foot from your mouth and just say you are wrong.

LOL... yeah b/c the cam has a 109 LSA from the factory!!! LOL... yeah that combined w/ the 179/184 duration and the .350/.384 lift make it a HUGE cam that will lope like a SOB!!!

Chris89GTA

iTrader: (2)

and revving like a 4 banger would mean...??? Good luck taking your 305 TPI motor to 8-9k like the 4 bangers...

EvilCartman

iTrader: (1)

You're even more stupid over here Mcdamit.

Mcdamit

Listen and read, 305 5spd / 350 AT 10066049* .415 .430 207 213 117.0 (116/-118) That will make a 305 slightly rough it is a mild cam for it, and try somewhere's around 210hp, car has 36,000miles so i assuming very little driveline loss. And i never said that those 305's hi-powered were stock.



Revving Like a 4 banger, i was refering to the carbed 305 first of all secondly i wouldn't take it above 5000

ZBRA

I happen to have an LS1 in the garage if you care to try to back that up.

Mcdamit

never said mine was faster

Mcdamit

and im not going to alabama

Chris89GTA

iTrader: (2)

Maybe... but...

... implies that you have seen one fly past an LS1... I would love to see that one!!!

iroczrockz

You really have to laugh about this whole thread. I have to agree that if you would just get an aluminum drive shaft it would satisfy your needs. Now if you wanted to go above and beyond...well, drop about $800 and get yourself a carbon fiber driveshaft and you'll never have any troubles.

Mcdamit

yeah but my point was that i dont wanna really have to buy a new one i just wanna know how fast my car can go before i become a plane

kevinc

Find out and let us know.

Mcdamit

thanks kevin, i'll do that.

DakotaSLT

I have run my Iroc well into the triple digits without a hint of complaint from either the driveshaft or u-joints. If anything the car settles nicely right around 100 mph.

You are not approaching any critical material strength properties in your car. You have no need to know at what speed the driveshaft will go into uncontrolled vibration, as you CANNOT reach that speed. Cheers.

EDIT: Because I expect more argument from you, the aerodynamic top speed of most stock thirdgens is approximately 145 mph. They do not "become planes" at this point, this is the speed at which their stock power levels cannot overcome the gearing and wind resistance to accelerate the car any more.

Also, if your response is something along the lines of "well my cast Iron POS vibrates and sucks so they must all suck" my only response to you then is your car has had ****house for maintenance. The stock steel driveshaft is fine at speed, albeit a disadvantage if considering only rotational weight. If you have high speed vibration problems, replace your engine mounts, tranny mounts, and u-joints. Have your driveshaft balanced (it only costs 20 bucks). And have an alignment done on your car and your wheels balanced. It will then happily carry you to any unsafe speed you desire. I call first dibs on parts from the wreck.

rjt76

can someone say troll

Gummie

It doesn't matter how old your driveline is, you should always be loosing roughly the same amount unless things start binding horribily. A 20 hp, or roughly 10%, loss is pretty unrealistic.

I'm all for defending what you have, just don't run around making out to more/better than it actually is.