Disappointing Dyno...
Drifting
Joined: Apr 2001
Posts: 1,763
Likes: 24
From: Austin TX
Re: Disappointing Dyno... (TargaC5)
Actually, the computer learns absolutely nothing at WOT. It only learns at idle and part throttle. The oxygen sensors are not accurate enough to use in power enrichment mode.
They will be able to learn at WOT only after they start using wide band oxygen sensors.
Eric
They will be able to learn at WOT only after they start using wide band oxygen sensors.
Eric
Drifting
Joined: Nov 2000
Posts: 1,456
Likes: 1
From: Allen TX
Re: Disappointing Dyno... (66ImpalaLT1)
i guess this is one for c4/c5 specialist or c5-tech. because i had knock retard due to improper gapping of my plugs (not installed by myself), and after i corrected the gap, i had it on a dyno. even though i wasn't showing any knock retard anymore, the computer was still holding back the timing. after resetting the fuel tables through a tech 2, i drove the car hard for 50 miles, brought it back and the computer was able to advance the timing. wouldn't that be an example of a car learning timing at WOT? :boxing
[Modified by thefly, 11:06 AM 9/10/2001]
[Modified by thefly, 11:06 AM 9/10/2001]
Racer
Joined: May 2000
Posts: 441
Likes: 0
From: Center Valley PA
Re: Disappointing Dyno... (RajunCajun2001)
Sounds right for a stock auto, but he isn't stock. Shouldn't the Donaldson do anything? I'm not familiar with the Donaldson, but the Pro Flow+ cold air system definitely shows noticeable gains at the dyno. The Vette Docs have the before and after dyno slips on their site. Is the Donaldson not cold air?
Also, I am pretty sure that I have seen the PLII show some gains on the dyno.
Also, I am pretty sure that I have seen the PLII show some gains on the dyno.
Melting Slicks
Joined: Aug 2000
Posts: 2,019
Likes: 0
From: los gatos, ca
Re: Disappointing Dyno... (spookyp)
Keep in mind this is a 2001. Why does that matter? The 2001 airbox is much less restrictive than past years. In fact, the entire breathing path is much less restrictive(airbox, bigger MAF housing, higher flow intake). The breathing efficiency was improved so much, that GM actually used a less aggressive cam for 2001 which reduces hp(more than made up for by breathing improvements so hp is actually slightly higher) but increase tq.
If GM had not made the breathing improvements but instead used only the less aggressive cam, you would see a 12 hp drop and a 12 tq increase. Conversley, 2001 breathing improvements alone leaving the original 97-00 cam would have seen about a 12 hp and tq increase.
Too bad we don't have variable valve timing
A stock 2001 should not see big improvements with an airbox but should see much better gains with cam alone than previous years. :U
[Modified by sorka, 4:21 PM 9/10/2001]
If GM had not made the breathing improvements but instead used only the less aggressive cam, you would see a 12 hp drop and a 12 tq increase. Conversley, 2001 breathing improvements alone leaving the original 97-00 cam would have seen about a 12 hp and tq increase.
Too bad we don't have variable valve timing
A stock 2001 should not see big improvements with an airbox but should see much better gains with cam alone than previous years. :U
[Modified by sorka, 4:21 PM 9/10/2001]
Drifting
Joined: Nov 2000
Posts: 1,456
Likes: 1
From: Allen TX
Re: Disappointing Dyno... (sorka)
the air box was improved till '02 for Z06's i thought. it is true they did use a larger maf in 2001, but i saw 12 rwhp improvement with just a vortex on a dyno. i also am not as famliar with donaldson's, but i am sure that there is a gain in removing the restriction off of the air box which is still quite restrive vs. most.
[Modified by thefly, 4:24 PM 9/10/2001]
[Modified by thefly, 4:24 PM 9/10/2001]
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Racer
Joined: May 2000
Posts: 441
Likes: 0
From: Center Valley PA
Re: Disappointing Dyno... (Avanti)
That's true to a point, but when you are putting big money into mods, you really do need to see it validated with numbers; be they dynos or ETs.
When talking about +/- 10hp, or +/- .3 sec ET, the change may be too subtle to be detected and need to be truly quantified numerically. Sure these are subtle changes taken individually, but when looking at the final outcome of a modded car, it's nice to know what mods yielded what gains.
When talking about +/- 10hp, or +/- .3 sec ET, the change may be too subtle to be detected and need to be truly quantified numerically. Sure these are subtle changes taken individually, but when looking at the final outcome of a modded car, it's nice to know what mods yielded what gains.
Drifting
Joined: Nov 2000
Posts: 1,456
Likes: 1
From: Allen TX
Re: Disappointing Dyno... (TexasRedY2K)
TexasRedY2K, is right the torque number looks great, i bet there is some kr happening on wide open throttle. did you have any dips in the horsepower and torque graphs?
Safety Car
Joined: Feb 2000
Posts: 3,635
Likes: 0
From: houston Texas
Re: Disappointing Dyno... (AUandAG)
Let me start by saying I love my '01 C5's handling and it exhibits more power on the street than I'll ever need. However, I'm disappointed with the results of my first dyno yesterday: 291rwhp 318rwtq. Seems awfully low to me. OK, I confess. The dyno was probably the first time to see redline in her 6k miles! Is that the problem? I'm not driving her hard enough? A stock '02 A4 dynoed right after me with virtually the same results: 292rwhp 317 rwtq. Shouldn't I be getting something more from the Blackwing and Powerloader II? Any comments are appreciated.
Thanks
Jim
:confused:
Thanks
Jim
:confused:
Safety Car
Joined: Feb 2000
Posts: 3,635
Likes: 0
From: houston Texas
Re: Disappointing Dyno... (DanielALee)
Shhh... don't tell this to import owners. DYNO NUMBERS MEAN ABSOLUTELY NOTHING!!!
Go to the drag strip and lets look at your trap speeds. I would guess 106-108mph.
Go to the drag strip and lets look at your trap speeds. I would guess 106-108mph.
"shhh...don't tell the imports" :lol: