sandwedge

Or maybe they do the dyno tests but decide not to publish the results after the $$ spent/hP gain ratio becomes clear.

Mike in CA

Agree

NAM VET

I think repeated dyno pulls are really, really hard on an engine. That long pull at full throttle in a single gear puts a lot of heat into an engine! I am aware of a number of owners, of other cars, who had dyno tuning of their cars, and by the time the operator was satisfied that the maximum power attainable was achieved, the engine had burned valves and rings!! Frankly, getting 350+ hp out of a naturally aspirated, streetable, legal 3.5/3.8 liter engine is quite an achievement.

I had my Superformance Cobra Replica, with a stroked/bored 351 Windsor, at 392 ci, properly built, on several chassis dyno. Put out just over 400 ponies at the rear wheels, which in a car weighing less than a Miata is stout indeed. I could outpull turbo Porsches on the track, at least until the first turn. On the first session, the operator put a lighter (the White spring) in my vacuum secondary, as it wasn't getting into the secondaries until way up in the RPM, picked up a nice 45 horsepower in the middle RPM, although peak HP remained the same. For about fifteen cents for a Holly spring. Cheap by any measure.

Easy and cheap to tune a simple carburated V8, when emissions and drivability don't matter. I had mine so rich, for max HP, that on our Cobra drives, the following drivers got sick from the unburnt fuel in my exhaust, so i re-jetted a less rich mixture. But for something like our Porsche engines, it is expensive and very complex to add power.

I know of others who burned their motors on the dyno, just maximizing power. Unless you are a performance engineer, and want to back up your claims, I wouldn't subject our cars to any dyno runs. I don't intend to do so for my 997, if i do ever get any mods on the car.

I think dyno runs just make an engine ache.

All the best....

utkinpol

dyno runs with p-cars are getting done with an open rear lid and a huge blower pointed there to minimize heat and to push hot air away from intake. overall you have nice 1st pull, next 2 pulls are usually 5-7hp lower than firsts, then you better stop and wait for 20-30min to let engine cool down.

kouzman

i am curious to see what my bone stock 09 3.6 will pull on the dyno...

I would expect that from a 345 hp @ the crank engine with around 12-15% drivetrain loss the car will still produce 295-305 rwhp which IMO is very strong for a NA engine on a car that weights about 3200 lbs...

RedBarron2007

DYNO with proper cooling fan is not anywhere near as hard on the motor as people act like they are.. remember you are only pulling through ONE GEAR. if you think your motor is that fragile, I would hate to see how you drive it on the street.

RollingArt

Interesting comments coming from a guy who's managed to blown up his car TWICE in the first couple hundred miles of ownership!






Phil

RedBarron2007

lol thanks...

I have owned a few cars before this.. none as delicate as this pile has been.. german engineering huh?

lol It sure did drive nice for the 15 miles it actually ran today.

RollingArt

LOL

That's some crazy stuff for sure.

GL





Phil

kosmo

heres a P that isnt afraid of the Dyno:

http://blogs.insideline.com/straight...11-gt2-rs.html

RollingArt

I was flipping through my car's manual this morning and came across this on page 61. Thought it was of interest to this thread;

"Power measurements on dynamometers are not approved by Porsche."

So if your car pukes up on the dyno don't let your CPO service writer hear about your dyno run.






Phil

kouzman

i actually checked my manual too for my 997.2

if we are reading the same thing, it refers to having a 4wd car on a 2 wheel drive dynamometer, which no sane or decent mechanic would even try it!

The RWD cars would can test them on a 2wd or a 4wd dyno, and the 4wd car only on a 4wd dyno...

RollingArt

No, No.

AFTER the manual tells about rwd vs 4wd dynoing for emissions, there is a section just for "Power measurement" , and it reads,---

"Power measurements on dynamometers are not approved by Porsche."

Meaning,,, NO dynoing to check max power output. 2 or 4 wd. Period. Stop.






Phil

Nugget

The only "dyno" I care about is my lap times.

kouzman

That's a true statement!!!

When I had my EVO, people were asking me how much power it was making... My answer was that it runs 10s @ 134-135 mph on pumpgas at 3400 lbs weight with driver... Quite confusing fir someone who doesn't know but soo true