I was looking over the numbers, and a 1997 Z28 has 285hp and 325 torque.
The 1999 Z28 has 305 hp and 335 torque.

Is this going to give the 1999 much of a performace difference vs the 1997?

Well maybe this is a better question, what would a stock A4 1997 Z28 run in the quater mile.

And what would the 1999 Z28 stock A4 run in the quarter?

I use the A4 for comparison and there are many more autos than sticks.


Thanks

 

Forget what GM says they make, they're underrated.

The LT1 probably makes about 300 HP/350 FT-LBS. at the motor

The LS1 probably makes about 350 HP/370 FT-LBS. at the motor

With a killer driver inside both cars, I would say 13.8@102 for the LT1 and 13.1@107 for the '99, both A4s.

 

Go to gmhightechperformance.com. On the home page they'll let you view a series of articles they did on a "stock" 99 or 98 Trans Am A4 that did 12's with a little work. I've read articles in other magazines that show dyno #s at the rear wheels of 303hp on a completely stock ls1 car. Assuming a 15% loss through the drivetrain the 350hp at the motor is more like it. Most lt1 cars seem to be closer to 245-250 at the wheels.

 

Trying doing a search for "LT1 vs LS1" on this board (lots of threads about it) and "LS1 1/4 mile" or "LT1 1/4 mile".......something like that......see what you find. This has been discussed time and time again.

As a rule, I'd say that most A4 LT1's (LT1 being the motor in the '97) are good for mid-low 14's stock, and most A4 LS1's (LS1 in '98+) are mid-low 13's (see my sig.......13.4~ish is actually quite common ).

 

ignore GM horsepower ratings...in the case of both LT1s and LS1s (though WAY more in the LS1 case) they are far from accurate...

as was said, a stock LT1 will put out around 295 hp at the flywheel while an LS1 is right around 345...the difference is pretty significant. GM used to handicap the f-bodies to keep the corvette power numbers looking good, though the difference was mostly just on paper....

here's an example of an LS1 vs. LT1 drag race...(assume bone stock cars with the same transmission)

1st gear - LT1 will likely jump out to a slight lead (1 car or less)
2nd gear - LS1 will have at least pulled even and will likely be slightly ahead...
3rd gear - LS1 will pull considerably on LT1, multiple car lengths...

 

basing 97 vs 99 the torque from the 97 is where you would see the power on the low end.. but LT1s being the pain they are, I would rather go for an LS1 anyday..

The newer the better.. for engine life and for the diffferent factory changes made.. Such as the 01-02's...

 

Yeah, i raced a 97 Z when my car was stock and so was the other guys. We both had a Stick, so there is your control there, and we were both decent drivers. He pulled me off the line so my front bumper was on his back bumper, then i hit second and passed him and beat him by a car or two. So you can see where their torque is, way down low around 2 grand, and an ls1 around 3200 and up. there is alot more top end on the ls1, however, if you plan on doing alot of mods or forced induction, the LT1 is cast iron, and it seems to me like it could handle more, i may be wrong though.

im glad to hear i had around 350 horsepower stock. woohoo.

 

From my experience, newer is usually better. Both motor are great but I think the ls1 is a step up from the LT1. You going to see more off the line, low end torque with the LT1.

The Ls1 has a larger, but higher power band, from about 2500RPM all the way up. And your aboiut 200 lbs. lighter.

You do a LS1 A4 with a 3500 stall and you'll be running ahead of 90% of the cars on the road. Either way they're both great motors.

 

The Lt1 was a great motor (especially for FI), but the LS1 in the same platform should be worth .5 second with all things equal.

 

There is an easy 50 HP difference between the 2 . I raced a six speed LT1 with headers and gears running thrue a cutout while I was stock . It was dead even thrue first " Him being geared and having headers " after that , I left him BADLY . at the track I have beaten many of them .9 tenths of a second on average and about 9MPH higher on the traps on average .

I have owned 2 LT1's and My LS1 . And its a different world with these cars .

 

simple answer
about a second

 

Don't forget that the LS1 is much lighter than the LT1. Also the motor is further back than the LT1, better for distribution, but SUCKS for plugs and wires!

 

It's all prefrence and pocket book. I bought my 97 when i was 16.. it was what i could afford. Also liked the front end better. My friend just bought a 99 WS6. When i'm in the car, his top end is just crazy fast. But if i had to do it again i would still pick my car.. why you ask? Well parts are cheaper.. more are known about what goes wrong and how to fix it, and after first and i'm a car ahead already, that 100 shot just sends me sailin if i want it to.

 

Much lighter ? Not really.....50 pounds lighter . Thats about it . as far as the engnie being back farther , what does that have to do with anything ? Its not farther back to make any kind of a difference on anything .

 

My old '97 Z28 ran 13.86@101.68 on a cool night, bone stock.

I replaced that with a '98 1LE Z28 that ran 13.21@108.29 all stock.

Next was my '01 T/A, which with the only mod being 17x9 Firehawk wheels shod with 275/40/17 Nitto 555RII road race tires on all four corners ran a 12.97@108.4.