Dynoed today

[OneQuickV6]

Calm down there son...Go to any real performance website, and ask if tires make a difference on the rollers. I never said it hurt your engine's performance, it doesn't. But the rolling resistance the wheels and tires add make a HUGE difference. And yes, dyno on an salad shooter and ET drag combo...and then dyno the same setup with draglites and the same tires. HUGE difference. Now go do your homework before doubting me EVER again.

I've done more dyno work on different setups for the F-body than you ever will, period. Now get off my nuts, you're cramping my style.

[Just Another V6]

Sure buddy, Ive never had any experiences with the Dyno...I just play with one everyday...www.modernspeedlabs.com...Someone looking for a tune, doesnt care about tire psi...If you want to be a dyno queen then you do whatever tricks you need to do in order to get the absolute biggest numbers...If you dyno on a mustang dyno, then yes numbers will be better(with low tire psi=less weight) because it takes load and conditions as a factor...Not DynoJet's...

People if you keep thinking tire psi increases wheel hp, then you really should look into other ventures like collecting figureens, car models, hair ect...Also I really doubt they let you "work" on fbodies on the dyno, unless you were their tunner, which you obviously arent...

[OneQuickV6]

Ever tried to tune or dyno one of your cars on ET streets? Kind of choppy, hard to get a smooth curve and see what needs to be adjusted?? It's in part because of the flexable nature of the tire, which alone makes for a crappy looking graph, often misinterpreted as valve float in higher rpm's.

Also after checking out your website, I see one LS1 car, and alot of imports....Have you ever tuned an F-body or Vette?? Wait, you're not even listed on the employee page. Do you clean the shop for them?

So while you may be able to tune with an ET street on a car, it makes fr a shiity skewed graph that is hard to read...you're right, you're the man...your honda's you work on rule the world!

[Just Another V6]

Yea, all the cars on that website are slow...

hell a 4 cylinder 240SX with a SR20 Swap will run 13's stock...

supra's are slow stock...

skyline GT-R33 slow stock...

skyline GTS-T32 slow stock...

Lexus with a 2JZ GTE swap slow stock...

500+hp Integra's are slow...

Nissan 300ZX's are actually slow stock...

MR2 Turbo slow stock...

STi's are slow stock...

EVOVIII's are slow stock...

The site isnt up to date, weve been busy with the location of the Skyline and opening up our 14,000sq ft facility. We work on all cars, including my V6 which puts out well over 330rwhp 420ft lbs on stock internals. Yes I am the one that cleans up the shop...


Bottom line is that the PSI in your Tires on the Dynamometer will NOT increase your engines hp...It will however throw off the rollers into less tire slipping and make them think that your car has gained more power...Thus a incorrect Dyno...

Again, you make me edit your post.....

[ January 22, 2005, 09:23 PM: Message edited by: 12secondv6 ]

[12secondv6]

Originally posted by OneQuickV6:
</font><blockquote>quote:</font><hr />Originally posted by Just Another V6:
tire psi on dyno means nothing...

Pardon?? I've seen 30rwhp swings because of tire/wheel combos, on multiple occasions! Please don't fill this forum with false statements..it's one of the last on the board that is still untainted. </font>[/QUOTE]100% true!

A GOOD dyno shop will ask if you have dynoed before and what tire psi.

I have been to....countless dyno shops and put my bird on countless dyno's.

Tire PSI WILL affect dyno #'s/ graph.

To put it in lamens terms.

I take a car (DOES NOT MATTER WHAT KIND) and I have 15 psi in the tires and make a run on the dyno

I then raise the tire psi to 40 and redyno.

Comparing a rotating tire/ wheel combo of 15 PSI vs 40 PSI, which has MORE and which has LESS rolling resistance?

My example is one of somewhat extreme's... but... seems like an easy way to provide one basic example of how tire PSI would affect dyno #'s

Just Another... quit the crap talking!

[OneQuickV6]

True, it doesn't affect the motor's powe output, but it does give a more accurate display of what the motor's doing. More resistance from drivetrain and wheel/tire just kills the graph, not the motor's actual output. Thanks James.

[1DangerousV6]

is this all because i said his tire psi seemed ok? ..*sigh* ..wow..i started another war and i wasnt even there..i dont even know crap about dynos..i'll be on my first one this summer [img]smile.gif[/img] ..i just figured the rollers were supposed to act like the surface of the strip..and therefor anything that comes into play there would come into play on the dyno..wheel weight..tire psi..traction..etc..except i've heard your gear ratio can through a dyno off..unless maybe they calibrate it for that..correct me if im wrong..cuz like i said..my first one will be this summer where im planning on/hoping for putting down over 310hp to the wheels! [img]graemlins/rock.gif[/img]

[12secondv6]

Gear changes will not affect dyno results.

If a speedometer is not corrected then a speed limiter could be reached at a lower "true" speed and not give you a FULL dyno run.

You did not start another war.

There was some misinformation that needed to be corrected.

[1DangerousV6]

ahhhh...cool..well i no longer have a seed limiter so i'll be all good there :D

[HAZ-Matt]

Originally posted by 12secondv6:
Gear changes will not affect dyno results.

I don't know how I wandered into the nitrous forum, but since I am here I would like to add that changing to lower gears reduces power slightly, whereas changing to higher gears increases power slightly. With a lower gear you are accelerating everything in the driveline at a higher rate which will effectively increase parasitic losses. The opposite is true with a higher gear.

[OneQuickV6]

Originally posted by HAZ-Matt:
changing to lower gears reduces power slightly...will effectively increase parasitic losses

Correct. It's only power as seen by the dyno though, like stated earlier, the motor's still making the same power.

[shortdog273]

That's a big shot for a V6. Decent numbers though.

[12secondv6]

Originally posted by HAZ-Matt:
</font><blockquote>quote:</font><hr />Originally posted by 12secondv6:
Gear changes will not affect dyno results.

I don't know how I wandered into the nitrous forum, but since I am here I would like to add that changing to lower gears reduces power slightly, whereas changing to higher gears increases power slightly. With a lower gear you are accelerating everything in the driveline at a higher rate which will effectively increase parasitic losses. The opposite is true with a higher gear. </font>[/QUOTE]Oh, that I was unaware of.

Not being a PITA, do you have more on this?

[98Camaro3.8]

James, I've read about that in the past. Here's a quick thread from the Drivetrain section: http://www.camarov6.com/cgi-bin/ulti...;f=23;t=002766

[OneQuickV6]

It's true James...just like a higher RPM stall convertor is going to "chew up" some HP on the dyno. It's all parasitic losses. I've seen about 10rwhp difference from gears on the rollers (on a 450rwhp HC LS1 car).