Guys, guys, it was the LT4 factory auto trans Vette that made 390 FWHP, not the ultra common 6 speed LT4.

Hope this clears things up :thumbs:

Eric

 

If you take a look at the dyno page at grandsportregistry.com you will see that two others with similar mods as mine were within 2 or 3 HP and torque as mine did on a dynojet. Also, the owner of an LT4 that helped me with the exhaust also had very close if not same numbers on the dyno as he progressed with his mods. Since these 4 are the only ones I know of with same mods that have virtually the same numbers, I would be hard pressed to believe there is much difference out there. :yesnod:

I might add that I fully expect to pick up another 20 RWHP after some tuning.


[Modified by southern_son, 7:50 PM 12/12/2003]

 

:bs :bs This is just another one of those "LT4 RULES" stories. I don't care what correction factor they used, it's BS.Funny how the first few post all said
"right on, luv mine, keep'm come'n".
There is a web site that compares a LT1 vs LT4 in the quarter mile. The story is total crap.Ofcourse the LT4 wins, but the LT1 driver lanuches at 1200 rpm and the LT4 vette launches at 5600 rpm. To get a fair comparision they should have had the drivers make a few runs and then switch cars.It was just more LT4 hype.

Now with that said, Damn I wish I had a LT4 ! :chevy

 

I've PERSONALLY watched a NEAR stock (K&N Filter, Cut-off mufflers) LT4 coupe put down 324rwhp (corrected). That's pretty DAMN impressive.

 

this guy took it to hart....
http://cgi.ebay.com/ebaymotors/ws/eB...&category=6168

here is a clip from his add

"Factory rated at 330 horsepower. Most cars produced between 350 and 360 from the factory, with some producing up to 390, all in stock trim. The LT4 Corvette has been know to keep up with and even outrun the legendary ZR1 as well as 75% of C5s. Think about that. "


who ever buy's that car is going to be bad when he races his 1st ZR-1

 

Here's the problem with dynos in general as it relates to the above. One of my dyno sheets is on the Grand Sport Registry website. Here is the pic...



As you can see, with mods similar to the above, my SAE Corrected numbers were 328, 331, 329. Here's the catch...I never could repeat those numbers. I tried twice on the same dyno over a period of several months and once on another dyno. The repeatable results (12 runs total) were consistently between 310 and 315. Unless the numbers are repeatable over a period of time, they're suspect at best. The car in question may very well be putting down that kind of power, but I'd want a few more fresh runs a month or two down the road to verify it.

Someone mentioned how "mad" a potential new LT4 owner would be when racing a ZR1 because of an admittedly silly ad. Although I hate to even start this because someone always feels like they're getting their pecker stepped on...Outside of flat out top speed (honestly, how many have run to ultimate top speed on this board...1,000 out of a population of millions of drivers?...and I sure don't see a cast of thousands in the Open Road Race events), a stock (entire car) LT4 v stock (entire car) ZR1 engagement in the 1/4 mile, on the autocross course, or on the road course will be determined as a function of driver skill. The SAE Net flywheel hp of 350-360 for the LT4 is real, as is the ~250-300lbs of weight (mostly in the front end) that the ZR1 has to overcome. I've beaten and lost to my share of ZR1s and other cars in the aforementioned venues (even before I began modifying my GS). Like everything, as soon as you spend a nickel on speed parts, all bets are off and who's the "quickest/fastest" becomes a function of check book size in addition to driver skill, ultimately culminating in cars that resemble Funny Cars, C5Rs, etc.

Now that I've gotten that off my chest...I figure in about 10 minutes I'll see the "King is Great" lecture and associated hate mail. :rolleyes: :leaving:

 

It’s more then just power man, the extra usable 1000rpm’s (and the extra power) in the LT-5 makes it LT-5 all the way.

I love the LT-4 motor. I have driven quite a few LT-4 cars over the Yrs, and am looking to buy a LT-4 car right now to part next to my 94 ZR-1 but in a strait line race the lt-4 stock for stock does not stand a chance, if you ask me.

 

Here we go.

The ZR1 has ~400more usable rpm (6800rpm fuel cutoff vs 6400rpm), not 1000. Every bit of the 6400 is usable with the LT4.

The power and rpm range is so evenly matched that driver skill comes into play in the 1/4...bad launch loses unless the better launcher short shifts and doesn't use the available power.

Rarely does the extra rpm come into play on an autocross. Many are run in 2nd gear only. The extra baggage (weight) does affect handling.

Ditto the baggage on the road course, especially on short (<2 miles) tight tracks. Longer ones, different story regarding the rpm.

Bottom line...Stock to stock the cars are very even in real racing venues.
Yes, I've driven a ZR1...many of them. Wouldn't mind having one except I'm too busy spending my pennies trying to stay ahead of/keep up with the Z06s on road courses :D

 

I dont know about what ZR-1's your talking about, but mine cut's of at 7300rpm (it has a chip, but I think it was 7200rpm stock if i remember right)


my zr-1 has Headers, Exhaust, Chip, cut away lid, and 4.10's, and I have pulled a 383 LT-4 by about 8 car lenths from 60-170 mph, and a Ported head, HOT cam, and bolt on LT-4 I pulled so hard it was not even funny.

I just dont see a LT-4 car stock for stock even being close to a ZR-1 in a race (granted I have never raced a stock LT-4 in a stock ZR-1)


my buddy has a head/cam 2002 zo-6 built be Extreme and he made 431 RWHP, him and my ZR-1 run neck, and neck till about 150mph when I start to pull away. ZR-1's run good from a roll.


[Modified by FastMatt2, 2:40 AM 12/14/2003]


[Modified by FastMatt2, 2:47 AM 12/14/2003]

 

I sure saw I bunch of BS flags before yours :skep:...and plenty were from LT4 owners


[Modified by tailgunner, 10:16 AM 12/14/2003]

 

For someone that admits they've never raced "stock to stock" (I have), it's amazing how certain one can be about their claims. Note that I talk about racing in the context of a real course (auto-x) or race track (1/4 or road racing), not acting like an idiot on the street which is the only place you can run "60-170" unless you happened to own or rent a Speedway or test track. Big deal you can hold the gas pedal down.

Regarding the "I've got these mods v 383 LT4, v whatever, whatever v Z06, etc"...Re-read my above comments regarding mods and all bets are off once the check book opens. My comments were made in the context of STOCK. No where did I discuss the impact of various mods on various engines.

I'm sure an F1 car could easily hand all of us our a@@es as could some of the exotic road-going European machines. Like I said, it's merely a matter of money as to who's the fastest.

No need to respond, as I'm done with this discussion. :flag

 

I wouldn't! If your car run an 11.0 ONE time, wouldn't you tell someone "My car runs 11 FLAT." ?? I sure in the hell would, because you can't REPEAT those results doesn't mean your car CAN'T repeat those results under the right conditions.

 

What if a dyno was out of calibration? maybe those number arn't repeatable?

 

Exactly!

 

How are those dynos calibrated? How often do they get calibrated?

HHmm... I know there is a big difference even between differnt vendors dyno machines.

 

somewhat off topic but...
Dynojet and Mustang dyno indicate noticably different results.

:jester If you want your car to go fast, use Dynojet, you get a bigger number
.
wtf. Does this discrepency bother anyone else?

 

If you do a search on "Mustang Dyno", they have a website that will clarify things for you. The bottom line is that two different test methods are involved and the results reflect two different things.