hey i just got a 1989 camaro rs with a 305v8. i was wondering if it came with a posi trac stock because it hasnt been modified and it is still completly stock except it have iroc rims. i was also wondering what size tire fits on iroc rims.....i belive they are 16 inch

 

oh also if anybody knows what kind of horsepower they are sposed to put out

 

Im pretty sure your car doesnt have posi. and the lo3 put out 170 hp, and 255ft/lb

 

Hey welcome aboard. Stock your car came with a peg leg one wheel peel rear end. You could get the posi as a special order option for the RS but it was super rare. The cost of it was pointless since the sticker would have been higher than a TPI car. Hoever, that doesn't mean a previous owner did not do any rear end work on that car. To be 100% certian you need to remove the rear end cover and look for yourself. Chances are the rear end fluid needs to be changed anyways.

As mentioned your car makes a slightly underated 170hp and 255lb ft when operating in a normal state of tune.

 

thanks...its ,my first car. i have always loved camaros so i love it......whata re some things i should do to the engine for some more power

 

oh and it does have tuned port injection

 

One of three things are going on here.

1.) Someone put a TPI system on/in your car.

2.) You have the B4C package

3.) You don't have a clue what the difference is between TPI and TBI.

My money's on number 3, but who knows.

Go take a pic of your car's engine and RPO code sticker and get back to us.

 

isnt tpi tuned port injection and tbi throttle body injection??

 

OK. But do you know what each one looks like?

I'm not trying to make you sound stupid or anything, but there are a lot of people that assume things like all IROC's had TPI, all TPI's were only on 350's, you could by a 350 with a 5 spd, on and on and on....

If you're sure that you have TPI, then option 1 or 2 apply.

 

i thought b4c package was for cop cars or something......can you please explain that to me

 

Go look at your car.

Does it have a round air cleaner sitting on a thing that looks vaguely like a carb? If so, it's TBI.

Does it have a long narrow aluminum thing going from front to rear sitting up kind of high, with 4 tubes snaking their way from each side of it down to the intake manifold? If so, that's TPI.

RSs are the base model car for that year. They' don't have the high-performance options like the better motors and posi. Probably less than ½% of all of them that came with a V8, had anything other than a 2.73 on-legger rear if they were auto, or a 3.08 one-legger if they were a 5-speed. If I was the betting kind, I'd bet that's what you have; 305 TBI, 2.73 zero-trac. In fact I'd probably be stupid enough (since my stupidity knows no bounds) to bet ALOT of money on it.

B4C is the RPO code for the police cars they made. They typically were a RS car, with one of the TPI motors and auto trans (although there were a few 305 5-speed ones; but most police depts ordered auto), the 1LE brake option usually, and usually (though not always) AC. There's a couple of colors that were specially ordered by some of the police depts for their fleets, that weren't standard RPO colors. It's highly unlikely, though not impossible, that you have one; which would be an extremely cool score. The majority of them are around Texas, Wisconsin, & California; because those states used them as Highway Patrol cruisers. There were only a couple thousand built, compared to about a quarter million like yours probably is.

Somebody changing the wheels won't cause the clutches to materialize inside the rear end. So don't bet on it having posi. But, the only way to know for sure, is to take off the cover and look. Have you changed the rear end fluid since you bought the car (that being one of the Day One maintenance activities - a complete fluid change - for a new car purchase)? If not, you need to. Make a point of looking at it while you're catching up on the maintenance you should have already taken care of.

 

thank you forur help ill look and just to tell you i know what the two look like tbi and tpi but thank you for telling em what the bc4 package was and helping me

 

Just do a burnout and tell us how many tires spin!!!!

 

 

That doesn't tell you anything about the car; all it does is tell the world at large how immature the driver is, and how many tires and rear end parts somebody is going to have to buy how soon. Above all, it DOES NOT tell you whether it has posi or not.

 

i had a 89 RS, 305TBi with 3.08 Posi. 5 speed too. it was cool.

 

how woul that not tell you....it will tell you....either one tire smokes or two

 

not that it really matters because if it doesnt im just gonna but one in it

 

No it won't. http://auto.howstuffworks.com/differential.htm

 

One of my cars is a 1987 v6 car. It is an open differential. I am sure of this. I have even gotten stuck in the snow with it before. Yet the other day, on the driveway, I decided to rev it up and dump the clutch just for fun, and it lay two strips.

 

so ur saying if i rev it up and burn out both will spin but once im driving only one will power it???

 

No, I'm saying that sometimes an open differential can spin both wheels. But not often.

 

and is that what i have?????

 

More than likely, yes. Tell you what. Go look in the center console. There should be a sticker with your 3 digit RPO codes on it. They're in alphabetical order, look for G80. If you have that code, then it came stock with a posi. BUT, someone could have removed it and replaced with an open during it's life. Or if it didnt come with one, someone could have added one. A burnout plus turning the wheels to see which way the other ones spin can give you a pretty good guess, but the only way to truly see is by taking the cover off. If you see springs and stuff, it's a posi. If it looks.. uh, well search for pics and you'll see what I mean.

 

thanks

 

Put your rear wheels in the air and spin one tire, if the other one spins the same way you have Posi, if not you have an open differential.

 

Thats not accurate either. That will only work on some kinds of LSD's and it still won't tell you if you actually have a LSD thats just worn out. My truck is like that. It spins the wheels opposite ways but has a Gov-Lock LSD. Pull the cover and look.

 

Take off the cover and look. It's the only way to know for sure.

 

Gov-lock is the bastard child of LSD's, and if it's been installed in car's, I haven't heard nor seen it. Installed in 7.5's yes, but S10's.

If the LSD is worn out, what difference does it make if it's LSD or not at that point?

If you jack the car up, rotate the tire by hand, and the other turns the same direction, you have an LSD. If it turns opposite way (or doesn't turn at all), you have a bad posi, a gov-lock, or open diff, all of which suck.

Oh, and BTW, a properly operating gov-lock can be tested with both tires off the ground. As long as you can rotate one tire by hand, this works. Spin the tire as fast as you can (as in a quick, violent, jerking motion one direction to get it moving) and you will feel the setup lock.

 

what does gov lock do

 

4th picture

That 4th pic tells you how a gov-lock works. Good in theory, poor in execution. Very weak units, lots of small parts, and the "speed limiting" function of lockup is bad, as is the 100RPM difference before it locks up, which shockloads the entire assembly, and causes catastrophic failure.

 

My truck is a S-10, a 94 S-10 SS actually.