Dyno Results Needed - stock vs. pods/pipe/jet kit

[blowerbike]

IMO the magazines back then was like reality TV shows we have today.
nothing they stated performance wise was ever duplicated by the consumer.
corrected this and corrected that..pfffft
specialty prepped bikes from the manufacturers and so on.
yes i enjoyed reading them and i also still have a stash form the 80's but after going to the track with a hired gun from 1985 to around 90ish..
just to duplicate gleason's GSXR1100 #'s i had to do a jet kit/pipe/advancer on my brand new 86 gixxer.
my point is the magazines may not be the best source of information.

[koolaid_kid]

Exactly why I was trying to find someone who had before and after dyno charts and 1/4 mile data from the present day with the configuration I am running; pods, pipe and a DynoJet kit correctly tuned.

[Nessism]

I remember the magazine tests from back in the day, a number of them, and I've yet to see one where the bike made more than 6-7% by adding pods and a pipe. I suppose some model bike may have had a particularly stopped up exhaust and made more power than that, but it's NOT the norm, that's for sure. The pipes that made such power were not typically the cheap and relatively quiet consumer pipes either. Basically, the Japanese engineers knew what they were doing. Without some sort of compromise, be it noise, poor carb isolation, something, you aren't going to make a bunch of power with a simple exhaust and intake mod. And a crappy pipe will lose you power too.

[koolaid_kid]

I can see a 5-6% increase. But they don't even show that.

[blowerbike]

the 86 GSXR was a prime example of big HP gains with a full system.
hell even just a slip on made the clutch slip on a brand new/not yet raced bike.
i'm thinking 15 HP on a full system.
the rear wheel HP on the stock bike i think was around 100..maybe 98.

[jimb12]

Don't have dyno sheets for it, but a friend's 1980 GS1100E picked up 7mph in the 1/4 mile with a VHR 4-1 pipe, pods and a DJ Stage 3 kit. Even allowing for the weight savings of the pipe, there's no question that horsepower was improved to get such a performance increase. Such a real, on-track performance increase means more than any dyno sheet by the way.

[koolaid_kid]

Thanks for the info, and I agree. A dyno is nice because you can present a chart, but it is the butt-in-seat dyno that counts the most.

[limeex2]

Having worked in a dealership for 20 years, I have seen many DJ kits put in that made the bike bikes run like ****. It isnt the dyno numbers that are impressive, its the driveability, getting the most HP you can, with what you have. Most tuners that are good, heavy emphasis on GOOD, can set the bike up for what you like. Mileage/performance/midrange ect. DJ kits are expensive, a good dyno man will pay for himself in driveability, performance ect. My bike stock bike ran fine. 36 mpg, good driveability. After a $500 dyno tune, it got 44 mpg, would pull from a stop sign in second gear, no surging, power from idle to redlne. picked up 8 HP on a TOTALLY stock bike. Drove the bike for 45000 miles before the bike went away. The savings in mpg alone almost paid for the dyno work. I my opinion, do it right, or don't do it all

[Nessism]

Having worked in a dealership for 20 years, I have seen many DJ kits put in that made the bike bikes run like ****. It isnt the dyno numbers that are impressive, its the driveability, getting the most HP you can, with what you have. Most tuners that are good, heavy emphasis on GOOD, can set the bike up for what you like. Mileage/performance/midrange ect. DJ kits are expensive, a good dyno man will pay for himself in driveability, performance ect. My bike stock bike ran fine. 36 mpg, good driveability. After a $500 dyno tune, it got 44 mpg, would pull from a stop sign in second gear, no surging, power from idle to redlne. picked up 8 HP on a TOTALLY stock bike. Drove the bike for 45000 miles before the bike went away. The savings in mpg alone almost paid for the dyno work. I my opinion, do it right, or don't do it all

Your bike must have been misfiring before the tuning work.

[posplayr]

Having worked in a dealership for 20 years, I have seen many DJ kits put in that made the bike bikes run like ****. It isnt the dyno numbers that are impressive, its the driveability, getting the most HP you can, with what you have. Most tuners that are good, heavy emphasis on GOOD, can set the bike up for what you like. Mileage/performance/midrange ect. DJ kits are expensive, a good dyno man will pay for himself in driveability, performance ect. My bike stock bike ran fine. 36 mpg, good driveability. After a $500 dyno tune, it got 44 mpg, would pull from a stop sign in second gear, no surging, power from idle to redlne. picked up 8 HP on a TOTALLY stock bike. Drove the bike for 45000 miles before the bike went away. The savings in mpg alone almost paid for the dyno work. I my opinion, do it right, or don't do it all

Using an WB02 sensor I screwed around quite a bit with all out runs till I finally found a long steep hill to do my "road pulls". Once i finally got the AFR as close as i was with my setup there was a noticeable improvement in the quickness of the bike (basically how easy the front wheel pulled up in 2nd gear).

So I agree there is probably some hidden Hp there if you have modified your bike but not gotten the AFR just right. Based on my results it is relatively sensitive especially to the needle taper.

http://www.thegsresources.com/_forum/showthread.php?t=164565&highlight=AFR+Info

As A guide, this is what I saw near my optimum tune point.

• 1 notch rise in needle ( e.g. 4 to 3 from bot) at 1/2 throttle will lower AFR 1 full point (e.g. 14.0 to 13.0).
• A drop in Main by 2 sizes (e.g. 140 to 135) at 1/2 throttle will raise AFR 1 full point.(e.g. 13.5 to 14.5)
• A drop in Main by 2 sizes (e.g. 140 to 135) at WOT ------- will raise AFR 1/2 a point.(e.g. 11.0 to 11.5)

SUMMARY: @ 1/2 Throttle: 1 needle notch = 2 jet sizes

[jimb12]

The DJ Stage 3 that I'm talking about in the GS1100E made for the best-carbureting CVs that I've ever ridden. Driveability and feel was great. Performance was good too as noted. No question that it was worth it for this bike.