Silverbullet951

i'm guessing the L98 has 240 at the crank. that's a real small amount.

Ethan

I thought computing wheel hp is about 13% of crank hp. I meant the L98 has 240 crank hp.

951Gary

My 951 must be pathetic. It's got a slightly shaved head, APE chips, and the higher numerical ratio diff, and I think most any LT1 vette will eat my lunch AND take my milk money. I've put a data-logging accelerometer in my car and a buddy's LT1/auto. Above 60 MPH they are similar. Above 80 (no numerical data for vette there) seat of the pants may give slight edge to 951. Below 40 MPH the LT1 is long gone. In fact, my Honda Accord beats my 951 to 40 MPH (apparently it's true what they say about stop lights and soccer moms in minivans...). There is clearly some difference between mine and a 951 that will pull 2 car lengths on a Camaro SS from 20 to 140. Any suggestions? I do hit 1.8-1.9 on the boost gage, it just takes awhile.

My suggestions for the vette race:
1. Don't brag too much beforehand. Crow is not tasty.
2. Rolling start- see if your dad will go for 40 MPH.
3. Heavy braking/throttle to get boost up PRIOR to the 'rolling start'. I wouldn't do this to my car, unless I really had to beat some Honda to 40.

Keep us posted on the big event
Gary

Silverbullet951

I have driven my fathers car, and I have driven my car, and my father has done the same. I feel I would be able to keep up with him. He agrees with me. Maybe not beat him because of all the mods he has , but definitely keep up. I'll keep you posted.

eclou

Race him for pink slips!!

Eugene

Yan

[quote]Originally posted by Jim Nowak:
<strong>Yan,

Let's not confuse RWHP with crank hp.

The last time I saw someone Dyno Jet a, 2000 LT-5 with a six speed, Corvette the car put-out 260 RWHP, approx. 25% driveline loss, in stock trim. With a K&N FIBK, modified computer, and a rising rate fuel pressure regulator they got it up to a little over 290 RWHP.

I'm sometimes amazed and a little confused when I see some "tuners" RWHP figures. The numbers can be misleading depending on the correction factors they use in measuring horsepower to the ground. A non Dyno Jet dyno can give you a different RWHP reading and it's usually much more optimistic than in reality.

Jim Nowak</strong><hr></blockquote>
Jim, I perfectly know what's the difference beetween rear wheel hp and flywheel hp. The Fbody LS1 has a ~12% loss beetween both explaining the high wheel hp vs the flywheel hp... But GM still underated them not to compete with the numbers of the Corvette C5 LS1. Here are some quotes from guys on <a href="http://www.ls1.com..." target="_blank">www.ls1.com...</a>
My message:
[quote]Hi!

Being given that a practically stock Camaro SS LS1 can obtain a very high 12s / 13s flat timeslip with a perfect driver, does it really have "only" 330 hp according to Chevy? How much power do they generally put to the ground? They must be underated by the company or something.

Thanks!<hr></blockquote>

Their answers:
[quote]Yup, that seems to be the consensus. For example, mine dynoed (showroom stock) 312 RWHP / 322 TQ.<hr></blockquote>
[quote]Stock at 1800 miles, my M6 SS put down 306rwhp and 323rwtq .. <hr></blockquote>
[quote]I dyno'ed mine with 11.5 look at the sig for the #'s.
SIG:
Dyno 11.5K Bone Stock
316 rwhp 321 ft. lbs.<hr></blockquote>
[quote]stock with 7,xxx miles 309rwhp/323trqe.
finally broke in!! Going back with mods<hr></blockquote>
[quote]Well not an SS ,but mine dyno'd at 305/320 and that was with only 4000 on the clock (shouldnt have gone so early).<hr></blockquote>
[quote]My SS puked out 321 RWHP and 342 torque, totally stock!<hr></blockquote>
Here's a typical timeslip for a Fbody LS1 -
Dyno Results:
9/15/01 (Showroom Stock with 10,000 miles)
<a href="http://mrz28ho.cz28.com/cgi-bin/i/images/dyno.jpg" target="_blank">Dyno Jet results</a>

Yan

By the way, what is a LT-5? Is it the engine version? That I know, the Corvette C5 (1997+) has a LS1 engine and the Corvette Z06 has a LS6 engine?

The LT-4 is the engine in the ~1995 Corvette Grand Sport, but what's about the LT-5?

Ethan

The LT 5 came in the ZR 1 Corvettes. Came out with 375 hp and I think had 405 when production ceased. Its a 32 valve 5.7. It also had a dual overhead cam. <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

Silverbullet951

I think they should have stuck with the lt-5 engine. it was very sophisticated, and was much easier to modify. with the same mods on the LT-5 and a LT-4, the LT-5 came out with more power. Just the exhaust upgrade yeilded 80 more hp. compared to and LT-4 which yeilded only 50.

Luke

[quote]Originally posted by Silverbullet951:
<strong>I think they should have stuck with the lt-5 engine. it was very sophisticated, and was much easier to modify. with the same mods on the LT-5 and a LT-4, the LT-5 came out with more power. Just the exhaust upgrade yeilded 80 more hp. compared to and LT-4 which yeilded only 50.</strong><hr></blockquote>


'It all comes down to money.

Jim Nowak

Yan,

You're right sorry about the typo it is C5 and I'm referring to not the LT-5. I am very aware of the LS1 engine in the Corvette. But, like I said the dyno results seem very high and they do not reflect what I've seen on the Corvette LS1 motor. I guess it comes down to the correction factor the guys at the dyno shop are using. If someone is getting 312 RWHP, 15-20% driveline loss in the manual and 15-25% loss in the automatic, their engine is producing around 360 crank horsepower in a manual and around 375 crank horsepower in an automatic. So, if in fact, the SS's are getting that much power to the ground they should be faster than a stock C5 Corvette.

Oh, and you forgot to mention those readings were't from a stock SS and what's up with the 1.02 correction factor: "The only mods performed to the car at the time of these tests were an SLP Cat Back system , SLP Y pipe, and a K&N air filter. The K&N has been shown not to effectively increase RWHP in these particular cars."

Check out a C5 Corvette site <a href="http://www.c5-corvette.com/home.htm" target="_blank">http://www.c5-corvette.com/home.htm</a> and look at all the modifications it took to get to 317 RWHP: LS-1 Power pak, Throttle Body By-Pass & Borla XR-1 RACE Exhaust, High Performance Ignition Wires, Pro Auto Tech Timing Tricker, Modified Mass Air Flow Sensor

I think your Camaro boyz are full of Nitrous with their horsepower claims.


Jim Nowak

Ethan

Another reason the LT5 wasnt kept was because it was made in conjunction with Lotus, and I think that even Mercury Marine even had something to do with it actually. Guess it was pretty expensive like Luke said. But 375 hp sure was sweet 12 years ago. Still is now too

Silverbullet951

you could say that agian.

Masonbrick

If any of the guys that I know with Z28's only put down 260 on the rollers, they'd be filing suit against GM!! The fact that LS-1's are so underrated from the factory is a big point of pride with Camaro enthusiasts.It appears that the LS1 has gained 5-8 RWHP every year of the engines production. Of course, also the fact that at the drag strip, they can walk C5's most of the time due to having a superior drag racing suspension also plays a big part. Not to mention the clear upper hand in the Mustang rivalry.
In the hands of a great driver, like Evan Smith, an LS1 car (Camaro/C5) can run mid 12's/108-111mph. That is no joke.

Luke

[quote]Originally posted by Ethan:
<strong>Another reason the LT5 wasnt kept was because it was made in conjunction with Lotus, and I think that even Mercury Marine even had something to do with it actually. Guess it was pretty expensive like Luke said. But 375 hp sure was sweet 12 years ago. Still is now too </strong><hr></blockquote>


yeah, back in the early to mid-90's when GM owned lotus and the turbo esprit S4 absolutley SMOKED the ZR-1. ...........I just love to rub that in the F/ z body fans faces. And I really like turbo esprit 4 cyl. cars.