Dyno shop in Colorado, 3:55 rear gear opinions.

[smashman]

Does anyone know of a reliable place to get tested in the Denver area? Corsa exhaust and hi flow cats on the way and I would like to do a before and after.

Also going to a 3:55 rear gear, I'm sure this is a dumb question but forgive me I'm green, but does a 3:55 rear gear instead of a 3:07 affect HP and Torque measurements at the rear wheel?

Lastly, any feedback from those of you who have changed to a 3:55 would be greatly appreciated so I know what to expect.

Thanks in advance

2001 RT/10 YELLOW

 

[KenH]

Here is the thread where I gave my impression after I installed gears.

http://vca2.viperclub.org/forums/showflat.php?Cat=&Board=UBB14&Number=275291&Forum=UBB14&Words=&Match=Entire%20Phrase&Searchpage=1&Limit=25&Old=allposts&Main=275291&Search=true#Post275291

Regarding the effect on HP readings, there appears to be no clear answer. Consensus seems to be that you will dyno maybe 5-8hp lower possibly due to additional gear friction losses.

I have not dyno'd again after adding the gears and cats, but since I did them both together, it would be inconclusive anyway and in my case I figure they probably would balance each other out.

--- Ken

 

[Anthony - 98 GTS]

I have 3.45 gears with a 19" rear netting an effective gear of 3.33. Its a great mod.

 

[snowmann]

Speak to Jim Slater at Northglenn Dodge he might know where you can dyno your car or he might be able to do it... Report back if that works.

 

[Dave T (BADVENM)]

Smashman, I've taken my Dakota to Dyno Pro Research. Their address is 5330 Tennyson St. in Denver. Phone number is 303-455-2443. They have a Dyno-Jet 248C. They have many pictures of vehicles they've dynoed. While I'm at it, can you give me any Colorado chapter VCA info like your next meeting and get togethers?

 

[Detlef]

While not in Denver, here in Fort Collins there is Redline Motorsports www.4redlinemotorsports.com with a dyno. They also have a Viper project car they are working on

 

[C.Thomson]

I live at about the same altitude as you and found this to be the best mod for the money. The car feels just like a stock one at sea-level. It must be wild at sea-level!! You do lose top end (I think my max speed is now around 170, based on the tach) but its well worth it. I might have suffered some HP loss, but my 1/4 mile times were a few 10ths better.

 

[Jerry Scott[CO]]

The Viper Club uses: Dyno-Pro, 5330 Tennyson St. Denver, phone: 303-455-2443. Ask for Bear. This is near Sheridan & 52nd. We will likely have another dyno day next year in May or June.

Jerry Scott

 

[Joe Dozzo]

If you've ever driven your Viper closer to sea level, you'll know just how far down on power we altitude-challenged folks are... Something close to 15-18% (~3% per 1000 ft).

I have 3.45's and they were the 3rd best mod I've done (Roe S/C and ABS being #1 and #2) and waaaayyyy better than headers / KN's / rockers / light wt flywheel...

As Jerry says, use Dyno-Pro, he has lots of Viper experience...

And search for S. Roe's 10 dyno prep suggestions. Or maybe just call Sean, I'm sure he'd e-mail you the list. (Sorry, my copy is at home...)