Idk if I'm posting in the right section, if not I'm sorry. I wanted to kno if anybody here dynoed a stock 5.0 liter h.o.? If so what were the numbers

 

I dynoed mine 2004 or 2005 I don't remember for sure. But I think it is a bit of a freak. It put down between 168 and 171 horsepower and 210 to 215 torque over four pulls. Which would put it about 205-210 at the flywheel. I used to take it to the track in the early 90's it would run 14.7-14.9's at about 94mph. The only thing that was done to it at the time was the convertor went bad so I took it off and beat all the stuff out of the inside. It was rattling pretty bad. Other than that it was 100% original. I could not afford to do anything to the car back then. I always thought people underestimated the L69. Back in the day my car would run door to door with a friend's 92 LB9 auto.

 

I've always wondered about this too. I hear these engines were underrated in the hp dept. I'd love to see a low mileage stock L69 car on a dyno and see just what kind of numbers it produces.

 

When I dynoed mine it had about 25,000 miles on it.

 

If you used a Dyno Jet then those numbers are actually right on track. I know a lot of people like to quote a 15% loss but that is not correct using a factory power rating. The factory ratings are more conservative than aftermarket ratings. When using factory flywheel ratings, a Dyno Jet shows about an 11% loss to the wheels. 190hp*.11=169hp.
If I remember correctly, GM said that the car would be rated at 200hp with 91 octane which equates to around 178hp at the wheels.
I have compared a LOT of different cars and the 11% rule is very accurate.

 

I dynoed my 92 T/A 305 TPI,5 Spd, 3.42 gears with K&N filter and plenum divider as the only mods, back in 2001 at the T/A nationals, I do not remember the name of the Dyno system, it was on a trailer.


Numbers were:

223 HP
290 TQ

 

The dyno we used was a Mustang dyno. Most Dyno Jets I have seen are pretty optimistic with thier readings. Hopefully soon I will get to retest it on a new Superflow Autodyn 30. We'll see how that goes. It's still stock, just more miles. Maybe it's loosened up and will make more power.

 

If you dont have a pic of your car on the dyno I have one. If you want it PM me your address and Ill send it to you. I have emailed/ pm'd ya b4 with no response.
Let me know either way!

 

My '84 Trans Am with the L69 and auto transmission got these results at 101K miles with 87 octane gas:

170.1 RWHP @4217 RPM
232 FT.LB. @3390 RPM

Only mod was a Flowmaster catback.