2001 Viper ACR Dyno

[TheStig]

https://youtu.be/NB1gexzXbT4

[MH60M]

What were the #s? Cameraman sucks balls.

[TheStig]

415rwhp. I didn't have access to the screen showing results. The car was picking up more power every pull. You can hear the operator say the numbers

[Venomess]

Any mods or bone stock?

[TheStig]

Just exhaust and a tune that was installed the day before. The car was making more power every pull as the computer adjusted itself

[98RedGTS]

What exhaust was that? Sounds kind of like the borla but I couldn't tell based off the pipes. If so, is that the 2 or 4 resonator kit?

[mackzilla]

Good numbers for what's done.

[Venomess]

^^ Really? I was gonna say for exhaust AND a tune id expect 430ish

[GTS Dean]

415rwhp.

Creampuff.

[mackzilla]

^^ Really? I was gonna say for exhaust AND a tune id expect 430ish

I've heard it's normal for g2's to be around low 400's stock. This was also on a mustang dyno which have been argued in the past as reading "conservatively". I don't even know that there's much to be gained via tune with exhaust as the only supporting mod, I'm no expert there. And what Dean said above^ I think there's 3 different cams across the 96-02s

[Venomess]

Mustang dyno would definitely rob roughly 15/20rwhp then. I missed the mustang dyno part.

[BrianACR]

Mustang dyno would definitely rob roughly 15/20rwhp then. I missed the mustang dyno part.

That would make sense then why I dyno'd at 400/403 with headers, no cats, and a tune. I guess a 2200' elevation doesn't help either....:)

[OK Falls GTS]

That would make sense then why I dyno'd at 400/403 with headers, no cats, and a tune. I guess a 2200' elevation doesn't help either....:)

I'll have my car on the dyno early spring. Catless now, stock tune with 4.10 gear. We're ca 1000' here in Penticton, we'll see what difference an extra 1200' makes.

http://www.simpsonracingsolutions.com/dyno-testing.html

[BrianACR]

It'll be interesting to see the results! Although the 4.10 gears will throw the results off a bit.

[Venomess]

Damn 4.10s?? I don't know if that would be more fun to drive or less. But yea your numbers will be jacked up. HP will be way down.

[OK Falls GTS]

[QUOTE=Venomess;328423]Damn 4.10s?? I don't know if that would be more fun to drive or less. But yea your numbers will be jacked up. HP will be way down.[/QUOTE

4.10 didn't hurt fuel economy one bit for starters, compared to my buddy's 2001 ACR with totally stock trim. It makes rowing through all gears fun. Quite useful on the track especially on the almost half mile straight at Area27. The increase of theoretical figures for torque and HP is roughly 26% but real numbers put down by the rear wheels, either - or + what counts. We'll see, proof is in the pudding, I'll report back.All I know, friend's Lambo Superleggera can't pull on me,lol
The Aston Martin in the video clip I posted, shown some weak numbers if a read that right. 300 lbs of torque with twin turbo doesn't seem much. Wonder if that dyno shows even lower # than the Mustang dyno?

[TheStig]

I forgot to mention that this car also has 3.55 gears. That robs some power too

[Venomess]

Well now that explains it haha! Exhaust, tune, gears and mustang dyno = only 415rwhp when reality is probably closer to 440

[GTS Dean]

food for thought:

http://www.hotrod.com/articles/hrdp-0405-chassis-dyno-guide/

[OK Falls GTS]

Generally speaking dyno numbers are dependent who is doing the test and what method used.
"However, there’s another, often overlooked, factor in the brew: rpm and torque are inversely related to calculating horsepower, so changing the rear axle ratio or testing in other than a 1:1 transmission gear seemingly shouldn’t change the horsepower numbers. Whether this actually changes a given chassis dyno’s reported results depends on how the specific dyno manufacturer does its math. For the most consistent results, always test in the same trans gear (generally 1:1) and rebaseline the vehicle after a rear-axle ratio change."

[Camfab]

I’ve had two 2000 ACR’s both had Corsa cat back exhaust when I first dyno’d them and both dyno’d on two different dyno’s. 424 rwhp on both one year apart. 100% stock otherwise. Ah, I love the old cream puff comments of yesterday, back in the good old days. I guess there’s a few of us old timers still floating around.

[BrianACR]

food for thought:

http://www.hotrod.com/articles/hrdp-0405-chassis-dyno-guide/

Interesting read.