Another TA Dyno

[lmcgrew79]

Dynoed the TA today with disappointing results. 6 Runs and the highest number was 515/488. My stock 08 on the same dyno made 520/487 and 548/538 with mopar pcm,cats and exhaust. The TA has 650 miles, 15w50 oil which may not help, tryed hood down, hood up, coolant and oil temps around 180/185, iat was ranging from 75-85.

http://i119.photobucket.com/albums/o141/lmcgrew79/Autos/2014%20Viper%20TA/Viper%20TA%20vs%2008%20Dyno_zpsiyotnc2c.jpg

[ACRucrazy]

Nice to see an overlay with your 08.
Thanks for sharing!

[Reaper]

I think you'll see a nice gain with more miles on it. Try it at 1500 or so. I dont think these engines are broken in til at least 1000 miles or so.

[IndyRon]

I'm not sure what to make of that graph. For a smoothing of 5, it is extremely jagged. Are you sure that there wasn't wheel slip on one part of the drum or something else isn't going on? Either way, the Gen 5 is going to be slightly faster, regardless of the dyno numbers with equal drivers.

[Nine Ball]

You have to remember that the 3.55 gear ratio in the Gen 5 also eats up some "dyno hp", probably about 12-15 rwhp, compared to the 3.07 rear gear in the Gen 4. But, the Gen 5 will be faster too. Dyno's don't win races.

[slowhatch]

You have to remember that the 3.55 gear ratio in the Gen 5 also eats up some "dyno hp", probably about 12-15 rwhp, compared to the 3.07 rear gear in the Gen 4. But, the Gen 5 will be faster too. Dyno's don't win races.

Came in to post this.

OP you are right on the money, you make 5whp less than the previous car except the previous car didn't have to eat 15whp worth of drivetrain loss from the more aggressive rear end.

[Viper.954]

That's interesting. I've never heard that rear gears rob HP. In my mind it seems that they would have the opposite effect, because it seems the motor would work less to get the car moving. My thinking comes from how I was taught to drive by my dad. He insisted I should never accelerate in over drive because it put to much strain on the motor. Granted he wasn't talking about a Viper. This was also 30 years ago.

[Jack B]

Put the diff on a bench and turn it with an elec motor. It will take more hp to turn 3.55s, than 3.07s.




That's interesting. I've never heard that rear gears rob HP. In my mind it seems that they would have the opposite effect, because it seems the motor would work less to get the car moving. My thinking comes from how I was taught to drive by my dad. He insisted I should never accelerate in over drive because it put to much strain on the motor. Granted he wasn't talking about a Viper. This was also 30 years ago.

[Voice of Reason]

Put the diff on a bench and turn it with an elec motor. It will take more hp to turn 3.55s, than 3.07s..

Fixed that for you.

[Steve M]

Your '08's dyno wasn't all that great (it looks like it was pulling timing for some reason between 4.5-5k RPMs), so it likely would have been higher.

Honestly, your numbers for your TA look about right from what I've seen...the G5 cars don't dyno well, but they run well despite what the numbers are telling you.

[lmcgrew79]

Here was the 08 stock vs mopar pcm, high flow cats, and corsa exhaust.

9172

[jaxtk]

Did some research on this, and found that a bigger rear end gear ratio, such as in your Gen V compared to your Gen 4. will result in lower Dyno numbers.

[Darius]

I've noticed my car get faster the more miles I put on it.

[FLATOUT]

I've noticed my car get faster the more miles I put on it.

Ralph told me the same thing after my first dyno. He said the rings in the Gen V were tighter than in the past and that they would loosen up.

[Jack B]

It's a bitch emailing from a phone, especially from the car in a snow storm, on the other hand, if it didn't snow I wouldn't know what to do. This has been the worst year for snow that I can remember. I will have snow in my drive in May.


Fixed that for you.

[Jack B]

Steve:

There is a caveat to the dyno comment, they sure pick up a lot of dyno hp once they have a tune or the Arrow PCM.



Your '08's dyno wasn't all that great (it looks like it was pulling timing for some reason between 4.5-5k RPMs), so it likely would have been higher.

Honestly, your numbers for your TA look about right from what I've seen...the G5 cars don't dyno well, but they run well despite what the numbers are telling you.

[lmcgrew79]

Steve:

There is a caveat to the dyno comment, they sure pick up a lot of dyno hp once they have a tune or the Arrow PCM.

Ill probably do that soon, i just thought it seemed low overall, but what do i know.

[TooBlue]

Dynoed the TA today with disappointing results. 6 Runs and the highest number was 515/488. My stock 08 on the same dyno made 520/487 and 548/538 with mopar pcm,cats and exhaust. The TA has 650 miles, 15w50 oil which may not help, tryed hood down, hood up, coolant and oil temps around 180/185, iat was ranging from 75-85.



You are fast on track. I think a lot of the improvements in the Gen 5 will make your new car really shine when you compare the two cars on a familiar track like VIR or Mid Ohio. I am anxious to hear what you think about the TC on track.
I believe HPT or the Arrow PCM will wake the car up on the dyno too.


Hope to get a chance to run with you and your track "gang" again this year....:drive:

[Stealth]

I agree that it is very strange that when dyno-ing in 4th gear (1:1), the gen v gearset causes a lower dyno number.

The pcm swap (arrow) sounds good but if you need to run 91 octane like we do in California, it looks like the gains for the pcm alone will only be around 20rwhp/rwtrq at most. This just does not makes too much sense to risk the warranty for 20 hp. Headers will add to the gains, but are not compliant with CARB requirements and would need to be removed to smog (about $800 on, then $800 off, and then $800 on again). Slacker emissions laws are just another advantage some other states have over California I guess.

[Jack B]

"Slacker emissions laws" or Left coast Paranoia, I know which one I would vote for, sorry, but, I could not let that go.




I agree that it is very strange that when dyno-ing in 4th gear (1:1), the gen v gearset causes a lower dyno number.

The pcm swap (arrow) sounds good but if you need to run 91 octane like we do in California, it looks like the gains for the pcm alone will only be around 20rwhp/rwtrq at most. This just does not makes too much sense to risk the warranty for 20 hp. Headers will add to the gains, but are not compliant with CARB requirements and would need to be removed to smog (about $800 on, then $800 off, and then $800 on again). Slacker emissions laws are just another advantage some other states have over California I guess.

[cashcorn]

i'm running the Belangers/Cats with the HP Tune, 91 Octane. Results, 598 rwhp 572trq(night & day difference over stock). makes sense to me, Stealth. + you have 5yrs with no smog check in CA

[Stealth]

"Slacker emissions laws" or Left coast Paranoia, I know which one I would vote for, sorry, but, I could not let that go.

Here in the Peoples' Republic of Kalifornia, we are definitely over-taxed and over-regulated.

It is more than a little ironic that in the number one car market in the world, the aftermarket is basically outlawed. I am just envious of other states.

[Stealth]

i'm running the Belangers/Cats with the HP Tune, 91 Octane. Results, 598 rwhp 572trq(night & day difference over stock). makes sense to me, Stealth. + you have 5yrs with no smog check in CA

What dyno did you use? I need to get some baseline numbers. I believe my stock Gen IV was around 544rwhp. Headers on my past vehicles (like C5Z and C6Z) made some difference but mostly just made the car less driveable.