chris5388

ok well im a pretty new lt1 newcomer and i just bought a 95 z28 and my speedometer only goes to 110 mph some people tell me because it didnt come with "z' rated tires from the factory its like that.Now someone is tellin me i dont have a real lt1 in my car i just want to clear this up because from what i understand all z28's from 93-97 came with a lt1 the same engine in the vette,is this true?.Also can someone give me another explanation for my 110mph speedo if what i think is not true.Im just confused and want to clear this mess up.

Thanks,
Chris

camarolt195

dont worry you r not the only one with that question a couple of my friend have the same question the answer is hard to answer maybe yeah about the z rated tires but the car is a Z28 rare but is is ? does your car have 1, on your shift **** like 1,2,

METALBEAST

iTrader: (1)

You have an LT1 don't worry. Your car did not come out with the Z rated tires and as such got the 110 mph speedo instead of the 150 mph speedo.

slowmofo

iTrader: (6)

And a top speed of 115, right? have to have the pcm programed if you want to go faster. If thats what your into...

BRENTT94Z

iTrader: (3)

Or, maybe the seller Installed a v6 cluster out of a wrecking yard due to low mileage difference. Maybe the original one had high mileage. Just a thought!

Shawn MacAnanny

iTrader: (12)

My Firebird came with a 150mph speedo, but it still has the limiter for not having the Z-rated tires so i dunno.

The engines are baslically corvette engines, except for a different intake and exhaust style. Also the fuel rail covers. Maybe the cam specs.

If your auto goes PRND32 then you have 2.73 rear end gears which was most often the option without the Z rated tires. Its what i have. They only ommited the 1st gear downshift because it wouldnt pass the noise deceleration in 1st gear. If you remove the top of the console you can get to the little plastic piece and cut it off. I did it with a hacksaw blade in about 3 minutes while i was waiting for my car to warm up.

Jordan57

Yep and you have the limiter also.....need to be reprogrammed. Even the shitty Hypertech can do that.

LoudmouthLT1

iTrader: (2)

Vettes had 4 bolt mains, ours only have 2 bolt mains. There are other differences making the power output differences. Its not the same as a vette engine though, I hate when people walk around saying its the same as a vette.

SAPPER

iTrader: (10)

Alot I'm not sure of concerning the speedos and tire ratings, but as for the engine crisis, If it is a V8 and it's got some *****. it's a LT1, not a transplanted L99 and I'm sure you could tell the diff it's a V6. As for the difference in the F-body and vette LT1's is the cam specs. It was only a mere 10 hp difference but the same heads, intake, 24# injectors, etc. All vettes had 4 bolt mains though and very few F-bodies, usually late in the year builds, got a 4 bolt main block due to shortage of 2 bolt blocks.

METALBEAST

iTrader: (1)

Other than the 4 bolt mains, they are vette engines in everyway. From the cam to the heads. They are rated at different outputs, but actually dyno identically on chassis dynos. I should know, I own one of each

METALBEAST

iTrader: (1)

The only LT1 Vette that cam out with a different cam than an LT1 F-body was the 92 . Just check out the LT1 Basics Sticky in this forum it list all the cam specs for every year.

SAPPER

iTrader: (10)

Metalbeast, your SS should be a 4bolt main.

METALBEAST

iTrader: (1)

It maybe, I have heard of some F-bodies getting 4 bolt mains, but for the most part, unless you had one of the 100 1997 SSs with an LT4 (which I sadly do not have), it should be a 2 bolt. I guess I will find out when I pull the engine out and drop the oil pan this spring