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Back in 1982 Cycle Guide Magazine published an article were they dyno tested all of the early 1980's 4 into 1 pipes on your GS1100E. The Cycle Guide testers evaluated pipes from Kerker, Jardine, V&H, Bassani, Supertrapp, Yoshimura, MAC, RC etc to name a few. The article also looked at centerstand & oil filter retention.
The dyno tests were performed on a stock 1982 GS1100E and were strictly limited to replacing the stock exhaust system with the aftermarket 4 into 1 (No Jetting changes using stock airbox). There was only one manufacturer which made more HP than the stock Suzuki GS1100E and that was the Supertrapp 4 into 1,....QUOTE]
What was the value of this "test"?Pretty obviously, the stock bike would perform poorly with a free-flowing aftermarket exhaust system, without the appropriate jetting changes. The real test, IMHO, would have been to compare all of the systems performing at the optimum A/F ratio. The Supertrapp performed the best under the magazine's conditions, perhaps due to the extra flexibility it allowed with tuning the level of restriction in the canister. Lest we forget, the stock system also weighs a good 30 lbs more than the typical 4x1, so even if hp were equal, the modded bike would still have the advantage, so to speak.
Tony.
Mysuzyq said:What was the value of this "test"?
The real test, IMHO, would have been to compare all of the systems performing at the optimum A/F ratio.
The Supertrapp performed the best under the magazine's conditions, perhaps due to the extra flexibility it allowed with tuning the level of restriction in the canister.
Lest we forget, the stock system also weighs a good 30 lbs more than the typical 4x1, so even if hp were equal, the modded bike would still have the advantage, so to speak.
Tony.
Pretty obviously, the stock bike would perform poorly with a free-flowing aftermarket exhaust system, without the appropriate jetting changes. The real test, IMHO, would have been to compare all of the systems performing at the optimum A/F ratio. What was the value of this "test"?
I believe the test results are relevant because not all of the aftermarket exhaust systems were free flowing, some manufacturers just jumped on the band wagon. The test vetted the poor performing aftermarket exhaust system which I believe were the Hooker, S&S & Alphabet among others. The GS'ers favorite 4 into 1's like Yosh, Bassani, V&H, Kerker KR were in a range of 0-3 HP below the stock GS1100E and I believe the Supertrapp was + 1-2HP above. I agree that uncorking the Yosh, Bassanni or Kerker KR would probably make the most HP but you might loose centerstand retention?
Most owners, started their performance modifications by first installing the favorite 4 into 1 and then discovered the joy/pain of rejetting. The 1982 Cycle Guide test would be fantastic with detailed optimum A/F ratios, but how much time & $ would it take to achieve optimum A/F on twenty different 4 into 1's in a era before the DJ or K&N jetting kits were even invented? Economics probably dictated the scope & limitations. IMHO, the test was done in a different era and the statement of "no value" is akin to Monday morning quaterbacking and benefits from twenty five years hindsight.
