Latest dyno - with T&D roller rockers

[axe]

Had T&D roller rockers installed a few months ago, and finally took it to the dyno

SAE 471.6 hp / 494.3 tq
http://kienwt.tripod.com/viperdyno4a.jpg

with dyno before T&D roller rockers, 26.2 hp / 10.1 tq increase
http://kienwt.tripod.com/viperdyno4b.jpg

dyno history - 96 GTS:
1) stock - 399.3 hp / 446.7 tq
2) S&B filters and tubes - 420.6 hp / 468.6 tq
3) TNT headers / Mopar Borla exhaust - 445.4 hp / 484.2 tq
4) T&D Roller Rockers - 471.6 hp / 494.3 tq

Is the air fuel ratio on the high side? What should it be at?

 

[Wolf]

Wow, sounds like I have to upgrade again to keep up with you....
A/F ratio should be around 12 or 13 to 1.

Your photos of the dyno run are not showing up in the link, you might want to double check it.

 

[axe]

It's weird, when I click on the link, it fails to display the image, but when I copy and paste the link into a new browser window, it gets displayed. Some weird tripod server thing?

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Wolf:
Wow, sounds like I have to upgrade again to keep up with you....
A/F ratio should be around 12 or 13 to 1.

Your photos of the dyno run are not showing up in the link, you might want to double check it.

<HR></BLOCKQUOTE>

 

[99 R/T 10]

Dude, that is a great pull! Isn't that like 540 HP at the flywheel?

Mike

 

[SUN RA KAT]

That's about the same improvement Sean Roe got when he added 1.7 roller rockers (I think he used Arrows) to his supercharger system.

26 rear wheel HP for what the rollers and installation costs is not that expensive for the HP gain. Did you need to change the pushrods or anything else?

 

[Russ M]

The power gain is actually about 15hp, the little hiccup at the end of the 471 pull is not your actual power. It looks like 460 is about the max hp before the rev limit bump or whatever it is.

But that is still a great increase in power for about 1k in mods, thinking I may have to do it.

 

[Diablo Joe]

If anything that air/fuel seems off a bit and some of that HP gain is from that.It appears on the second run you end up with a 13.6:1 vs 12.8:1 on the first pull.What would have been done to lean the car out like that?

Joe

 

[Russ M]

The first run is without the rockers, and the second run is with em. That would make the car run a bit leaner since vipers are speed density, but it would not make that drastic of a change.

Most likely is the use of a poor air/fuel analyzer, or an o2 sensor which has seen better days.

 

[Jack B]

Axe:

I'm also interested in adding the T&D's. Do you have data points for the respective hp's at 5300 rpm. Another issue could be the coolant temps for the separate runs. What were the smoothing and corrections factors.

If the coolant temps were similar this would be a great set of curves to permanently display. If you have the files for these two curves I can pull the data for you.