Triumphrat

robnobrakes · 12-07-2006

I have now had the Thruxton back on the dyno with the Predator exhausts. This was to check if the fuelling was OK with 138 main jets and stock pilot jets. The needles are raised with one shim. This was the set up with the TORS and K&N pod filters. I can confirm the fuelling is fine, with no change to the existing set up required.

Here are the Torque and Power dyno graphs showing the TORS curves (RED) and Predator curves (BLUE). Maximum power and torque are similar for both exhaust systems. The Predators do give more power and torque almost everywhere else. The huge dip in the torque curve with the TORS at 3,500 to 5,000 rpm is no longer there with the Predators.

TORQUE: TORS 61.3, Predators 60.5 ft/lbs

POWER: TORS 70.6, Predators 71.0 bhp

Fuel/AIR RATIO:

Thrux-ton-up · 12-07-2006

Thanks for the info! I like all dyno comparisons such as this. JCW

sweatmachine · 12-07-2006

thanks for posting, good real verifiable information is hard to come by, not so important are the actual numbers but the comparo is where it's at.

Glad I have the predators!

TroyH · 12-07-2006

Predators it is! Now I just need a book on how to rejet carbs.

sweatmachine · 12-07-2006

you don't need a book when you have Dinqua

Caffeinated · 12-07-2006

Hey Rob. What else did you do to get to 70 HP?

Sorry if you've been through this before.

Steve

robnobrakes · 12-08-2006

Quote:

On 2006-12-07 19:27, Caffeinated wrote:
Hey Rob. What else did you do to get to 70 HP?

Sorry if you've been through this before.

Steve

Hi Steve

Engine mods:
Airbox elimination
K&N pod filters
air injection removal
head skimmed (compression ratio raised to 10.4 to 1
head ported and gas flowed

Rob

Caffeinated · 12-08-2006

Cool, thanks.

That sounds like a pretty simple mod with pretty awesome results. I'll have to look for a shop in Denver that can do the work.

Steve

robnobrakes · 01-07-2007

bounced for Vox66

[ This message was edited by: robnobrakes on 2007-01-07 02:14 ]

Jimbonnie · 02-07-2007

*edited per TCB's pointing out I had my head up my...nevermind...

Rob:

Nice to see dyno tests. The conclusion that the Predators produce more power than the TORs is, however, not supported by the data because the fuel air mixtures weren't really dialed in for either system. And in the case of the TOR's the fuel:air ratio was over rich ( <13:1 ) where the torque drops in comparison to the Predators.

In the case of the TORs, the rich mixture caused the loss in torque and horsepower, not the other way around. A test where both systems ran closer to an optimum air:fuel mixture throughout the rpm range would likely have produced much different, and more usable, results.

[ This message was edited by: Jimbonnie on 2007-02-07 18:14 ]