[ConqSoft]

Submitted by: abtech

We ran the following tests regarding air filters on a stock 929 with OEM exhaust, Hindle bolt on and Hindle full system:

OEM filter 3 runs:

OEM Exhaust best run: 121.5
Hindle bolt on best run: 124.0
Hindle full system best run: 133.5

K&N 929 replacement filter:

OEM Exhaust best run: 119.0
Hindle bolt on best run: 121.0
Hindle full system best run: 129.5

"Whacked" filter (all paper removed, both screens remained)

OEM Exhaust best run: 124.5
Hindle bolt on best run: 127.5
Hindle full system best run: 137.0

These test were run on 108 Octane Sunoco "pump" race gas on a DJ 250 and were made without any third party fuel management system (i.e. PC111 etc.) The test site is 530 ft above sea level and all readings are SAE sea level temp and pressure corrected from "actual" 80 degrees ambient temp and 74% relative humidity.

The same set of tests run on Torco Stealth 14 followed almost identical curves, but yielded an average of 3 additional HP except for the full system with the "modified" OEM filter which produced 144 to 146 HP in 12 consecutive runs.

Pair system was removed (and sealed) while the flapper was IN during all tests.

[Leistung Elektr]

Hi, i´m new on the forum. I have a 919 1996 with a few modifications..ported head, more compression...and i have a fuel injector throttle bodies with a (ECU that i sell..now only for drag cars...soon for bikes...) to add so i can play with fuel. I had to rebuilt the motor because a crankshaf bearing problem (twice).

Mi question is that you change fuel curves o jets in diferent test or fuel remains original for all?

Thanks

Miky......from Argentina

[abtech]

Originally Posted by Leistung Elektr

Hi, i´m new on the forum. I have a 919 1996 with a few modifications..ported head, more compression...and i have a fuel injector throttle bodies with a (ECU that i sell..now only for drag cars...soon for bikes...) to add so i can play with fuel. I had to rebuilt the motor because a crankshaf bearing problem (twice).

Mi question is that you change fuel curves o jets in diferent test or fuel remains original for all?

Thanks

Miky......from Argentina

Miky. At the time of the testing documented in this article, no one had any mapping device available for the new (at the time) 929 engine. DynoJet did make their PowerCommander series available by late June of 2000, but all of this testing was done prior to the beginning of the racing season (March, 2000).

Subsequent testing with both the 929 and 954 has shown this information holds up very well even after hours of custom fuel mapping time on a DynoJet 250 with their Tuning Link software and on a water brake engine only dyno that was performed in late 2003. We also found that with a totally modified airbox (all internals removed, fire screen only) and VP Racing's U4 race fuel, the engine picked up an additional 6 HP over 93 octane unleaded pump gas. After mapping, we saw nearly 10 additional HP with the U4 on the 954 with the modified airbox.

These gains were entirely due to the fuel, as everything else stayed the same throughout the testing.