Quick Delkevic 18inch ovals review... - Page 3 - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #21 of 34 (permalink) Old 07-07-2020, 09:10 AM Thread Starter
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On my 14a (the fastest color red &#128540 I have just the 18Ē carbon fiber cans along with a k+n filter, Iím extremely happy with the end results, it just runs great ! No issues, but Iíll add that if I keep the bike Iíll send the pcu To Ivan for a reflash, not that there is any noticeable problem but from the results some have had here thereís no downside. Just depends on if I can get on the other side of my back issues.
I'm gonna hold off on the K&N I think....just because it doesn't really add power on this platform, and I don't like the idea of having to try to get an even coat of oil on the INSIDE of a tube shaped filter. Seems problematic.

I've bought 3 different pipes AND a high rise link pipe from Delkevic over the years, so I'm hoping if I decide to get the headers eventually that they will give me a small discount. We'll see.
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post #22 of 34 (permalink) Old 07-07-2020, 12:30 PM
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I'd skip the headers..... don't see what you'll gain.... what are you trying to gain? You're just emptying your wallet IMHO.

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post #23 of 34 (permalink) Old 07-07-2020, 01:03 PM Thread Starter
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I'd skip the headers..... don't see what you'll gain.... what are you trying to gain? You're just emptying your wallet IMHO.
Lol. I bet the combination of the baffled 18inch cans i have and straight through headers would sound fantastic. I’m sure it also smooths out the rev range even further than the cans did. As far as the heat, cats are hotter than straight pipes, BUT leaner engine conditions are hotter, so I’m not sure how much less heat it would be with those two opposing forces.... but yeah i agree, it’s alot of time and money for a couple hp.

1994 Honda VFR750 custom streetfighter
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post #24 of 34 (permalink) Old 07-07-2020, 01:11 PM
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The bike will go faster without all the weight in your wallet, lol. I like the sound of the Delk cans with the baffles in... VFR guys didn't like their headers. performance-wise....

Ray
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2014 FJR1300A - Root Beer (sold)
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post #25 of 34 (permalink) Old 07-07-2020, 01:48 PM Thread Starter
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The bike will go faster without all the weight in your wallet, lol. I like the sound of the Delk cans with the baffles in... VFR guys didn't like their headers. performance-wise....
I like my vfr headers, but then again I have an old carbureted 750. I will say that the headers were not the biggest power booster. That was hands down the combination of K&N, airbox mod, and Dyno Jet kit. The headers were a few lbs of weight savings, and looks, since mine is naked.

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post #26 of 34 (permalink) Old 07-07-2020, 04:45 PM
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All the work I got to do on my friends dynojet dyno years ago showed me the past the weight savings there was rarely any h-power gain and at best you could maybe see 2-4 h-power from a good set of headers and quite frankly most lost power to the stock exhaust.

Worst performance per dollar investment Iíve ever seen, Iíll never spend good money looking for performance on headers, just isnít there.

Steve P
Red 2014A, the fastest color !
Ride more,, worry less !
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post #27 of 34 (permalink) Old 07-07-2020, 08:36 PM Thread Starter
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All the work I got to do on my friends dynojet dyno years ago showed me the past the weight savings there was rarely any h-power gain and at best you could maybe see 2-4 h-power from a good set of headers and quite frankly most lost power to the stock exhaust.

Worst performance per dollar investment I’ve ever seen, I’ll never spend good money looking for performance on headers, just isn’t there.
So weird, because on every performance car I’ve seen, the headers add like 10/12hp and 8ft/lbs. Maybe it’s because they have those honkin’ cat converters in the stock ones. *shrug*

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post #28 of 34 (permalink) Old 07-08-2020, 08:52 AM
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So, a little math... 10 HP/400 HP engine = 410. 2 HP/145 HP FJR engine = 147. Over an hour's riding you'll get to the next gas station a coupla minutes sooner. Track bike, go for it, but your track bike won't be an FJR will it?

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post #29 of 34 (permalink) Old 07-08-2020, 09:11 AM Thread Starter
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So, a little math... 10 HP/400 HP engine = 410. 2 HP/145 HP FJR engine = 147. Over an hour's riding you'll get to the next gas station a coupla minutes sooner. Track bike, go for it, but your track bike won't be an FJR will it?
I bet The Rock would use an FJR as a track bike

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post #30 of 34 (permalink) Old 07-08-2020, 09:19 AM
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So weird, because on every performance car I’ve seen, the headers add like 10/12hp and 8ft/lbs. Maybe it’s because they have those honkin’ cat converters in the stock ones. *shrug*
Alt, a couple of things, was that h-power claim from an actual dyno test or just a manufacturers claims to sell product ?

On automotive exhaust they are typically waaaay more restrictive than a motorcycle, mostly due to the exhaust manifolds themselves which is caused by simply packaging trying to make things fit and nothing more. Bikes really don’t have the same issues and 99% of the dyno testing I’ve seen the stock bike exhaust is better than the aftermarket. Performance gains in the aftermarket exhaust is simply due to being much lighter, typically 50% or more lighter. Also a lot of the claimed gains is by the increased noise levels (Harley factor) if it’s louder it has to be faster, right ? Also the “butt” dyno is a big liar ! Not at all accurate.

Catalytic converters, claims of big power gains there are quite simply pure internet myth, it ain’t there, past the early GM pellet type converter the current honey comb brick type simply is not a restriction, the pipe diameter creates more of a restriction than the converter.

An example I’ll give is that I have a 94 Dakota that I used to drag race and all the internet “expert” gear heads convinced me that there was an easy 25rwhp by removing the stock 2.5” cat so I fashioned up a straight through test pipe and removed the cat, it produced not 1 mores-power, zero, nada, nothing ! It used a lot more fuel (screwed with the O2 sensor a little) which made it slower in 60 ft.

I called an aftermarket performance cat company to talk to them (MorFlow) about the results, the head guy there just laughed, he said he sells a lot of converters because the mistaken belief is that there’s this huge restriction and he told me that past the oe GM pellet type (highly restrictive) the new honey comb converters literally provide zero restriction and that the pipe diameter creates more restriction than the converter. I did reinstall a converter on my dakota with zero negative results. Quite frankly there is very little to no benefit gained by removing any of the “emissions” equipment on a vehicle these days, it just ain’t there, as I say, “pure internet bs” nothing more.

Now all that said, I have learned that quite frankly there’s very little to be gained in the fjr past improving the sound and removing a little weight, maybe,,, ,,,, ride more, worry less,,, just enjoy what you have ! If you need more speed, buy an R1! My .02
RaYzerman and rbentnail like this.

Steve P
Red 2014A, the fastest color !
Ride more,, worry less !

Last edited by passx; 07-08-2020 at 09:23 AM.
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