• If you currently own, previously owned or want to own an Avalanche, we welcome you to become a member today. Membership is FREE, register now!

Dyno Wars

enoniam

Full Member
Joined
Nov 30, 2012
Messages
2,860
It's been a while since I've had the beast on a dyno - before installing the supercharger as a matter of fact.

From some quick internet research there's a number of shops with dynos in the Louisville area.  From my earlier experiences I'm guessing we could arrange a group rate of somewhere in the neighborhood of $75 each, maybe less depending upon how many trucks we can line up.  If you're coming to the gtg, or even just a local not planning on getting over to Madison, post up your interest here.  If we've got enough to make it seem worthwhile to a shop owner to give us a cost break I'll see what I can arrange.  Given that I don't have a firm cost at this point I'm not going to consider anyone's interest as binding at this time.  That willl change a bit as we get a better handle on the numbers and details much closer to the gtg date.  Depending upon what's negotiated we may have to collect some $s ahead of time to reserve spots / confirm interest.

I'm thinking that Saturday morning will most likely work best, although depending upon what's negotiated with a shop that might change.  I'm presuming that doing this on a Saturday will be much less impactful to a shop's normal business than doing this on a weekday.

At the Saturday dinner the most powerful and most torquey first gen AVs, second gen AVs, and 2500s will be recognized, and of course posted here for all of the AV nation to see.   (y)

Edit - I want to make sure that it's clear that everyone is inviited - you don't have to have spent thousands on power adders to participate.  In fact having some bone stock trucks involved would be nice to provide a baseline.   :B:

March 4 Edit - I've lined us up with Automotion in downtown Louisville.  They prefer to do this on a weekday so we are going to do this on Friday instead of Saturday.  Here's the link to their web site:

http://www.automotionky.com/

They normally charge $85 which gets you 3 pulls - $10 extra if you want to get fuel air ratio data during the pulls.  They asked how many of us there would be - I guesstimated 4 or 5 and he said we'd get the 10% group discount with that many.  My calculator shows the base charge then being $76.50.

I didn't ask about it but Butch asked me if they can do custom tuning.  Per their web site they use HPTuners for GM vehicles so it seems to me that they can do our trucks.  Since I didn't ask about it I don't know what that would cost but I'm assuming that would probably be at least a couple $100 more.  I'll ask when I touch base with them as we get closer in late June or early July but if anyone is really curious feel free to call and ask them about it - I'm sure they'd love to get more $s from us - LOL!  They're good with running our trucks as long as no one is running a diesel - they get the shop too messy.   :rolleyes:
 
Hummm it been a while since I uncorked the 496 with the boys from Diesel Place on a Dyno.  >:D
 
Hopefully we'll get enough interested to have a good bargaining position with the numerous shops with dynos in Louisville.
 
Great!

They'll have wideband O2 sensors to put in the tailpipe (or else I'll find another shop) which will be handy to check your Air / Fuel ratio under boost and power enrichment mode.  I know I'll be curious as to what mine's doing!
 
Is there a 1/4 mile race track near there. ?
 
Looks like the nearest dragstrip is over an hour and a half away, on the other side of Louisville.  We'll probably be going to the Louisville area to find a dyno shop anyway...
 
Update to first post identifying dyno shop, cost, and doing this on Friday instead of Saturday.
 
OK, I've been seeing some posts on supercharger setups today -

Who wants to see what a Vortech-supercharged, methanol-injected, and cammed with shorty headers and flowmaster 70 AV, computer tuned by yours truely, can do on the dyno?

Who wants to see what a C5 corvette with long-tube headers, Weiand/Lingenfelter intake manifold, what looks and sounds like a Corsa Indy Pace car exhaust, and unknown internal mods (but it sure sounds like it's got a healthy cam) can pull on the dyno?  "Mike Mercury" who together with his wife have owned two C5s says it feels like to him about 400hp at the rear wheels, before I did much computer tuning to it.  Is he close or did the sweet sound from the exhaust with the convertible top down throw him off?

Who else wants to see what their truck, modified or not, can pull on the dyno!!!

Are you READY TO RUMBLE!!!
 
Dyno Wars Part Deuce. (y)
 
it's a dyno - not a track.  See the first post in this thread.  Should get there around 9:30 morning of the 26th.  Hope to see you there whether or not you make it to Madison!

Planning to use highway 42 from Bedford, KY to Louisville and probably return via Indiana.
 
I'm holding my ears!  Krazykarguy's mufflerless truck is on the dyno!
 
My AV had 378 rwhp @ 5600 and 401 ft-pounds at 4600 both weather corrected.

Our vette put down 380 rwhp @ 5300 and 427 ft-pounds @ 4100.
 
I wish that at least for my vehicles they would have used a more accurate way of measuring engine speed than simply seeing how fast we were turning the rollers at 3000 rpm and then extrapolating roller speed to engine rpm.  I've noticed significant errors when comparing to the data logs.  I attribute a lot of this to running a 3200 stall torque converter in my truck.  Not sure what's in the vette but its peak torque rpm seemed to be significantly off too.  Conveniently though for at least me they noted on our printed reports the roller speed along with rpm for our peak hp and torque values so I can correct their rpm figures based upon what rpms I was seeing for a given vehicle speed from the data I was logging during the runs.

From some research I've done I believe the dyno probably pretty directly measured hp, so I think our hp #s are correct, but the associated engine speed may be off - at least it was for my truck - the vette seemed really close.  Torque numbers for my vehicles are coming down because the engine speeds where they peaked were quite higher than the computer thought they were.  Basically I'm scaling my torque values by their quoted rpms divided by the rpms I see at the speed they quoted.  So here are my adjusted results:

AV
378 rwhp @ 5950
355 ft-lbs @ 5150 (first run)
323 ft-lbs @ 4350 (second run - thanks supercharger heat soak)

Vette
380 rwhp @ 5250
383 ft-lbs @ 4600

The AV's adjusted numbers seem more correct to me as the centrifugal supercharger builds boost at high rpms and I'd therefore expect higher peak hp than ft-lbs.  That said these numbers reflect very flat torque curves which mean my engines are not set up to give great peak numbers but have very nice "areas under the curve" for nice overall performance across a wide engine power band.  After driving my truck for a couple of hours to and from the dyno Karl can attest to that!   :cool:

I'll point out one more thing - these pulls were done on a Mustang dyno.  General rule of thumb is that the Mustang dynos spit out numbers about 10% less than the widely quoted numbers given by the more "generous" Dynojet dynos.  Guess that's why everyone likes to quote what they pulled on a Dynojet!
 
Back
Top