: aftermarket exhaust systems
01-31-2002, 03:39 AM
yo waasssupppp! just have a question. i was told that getting an aftermarket full exhaust system was not good for the R1. i heard that the bike would lose power because the exup was pretty good already. i was also told that getting an aftermarket full system doesn;t lose power. any help would be really helpfull. R1's ruleeeee.
01-31-2002, 05:04 AM
If you get a full system and do not set up the carbs you will lose low end power,if you set the carbs up correctly you will gain power throughout the entire RPM range
01-31-2002, 08:14 PM
THX TWISTED:) :)
01-31-2002, 08:27 PM
02-01-2002, 02:58 PM
Get the full Akropovik system with Ivan's jet kit and you will gain mucho power throughout the powerband. You're looking at $1000 for that stuff. I personally have an M4 carbon fiber slip-on with Ivan's needles and love it. Depends how power hungry you are and how fat your pocketbook is.:)
02-01-2002, 03:48 PM
Mr weeir, does the jet kit cost $1000 american?
oh one more question if i do get an full exhaust system, i heard of jet kits, power commander, and others. what kind should i get. any help from anyone would be much helpful. thx:machinegu
02-01-2002, 03:51 PM
Go here for more information:
Ivan knows R1s better than anyone. Give him a call and he will be able to tell you what works best. Good luck
One little explaination.
The reason a lot of bikes (most if not all) lose low end power when fitting a full, race system is gas speed. The exhaust is tuned to flow lots of gas at high engine revs which inturn, empties the cylinders more thoroughly hence, more power on the next burn through more clean air and fuel mixture.
At the other end of the rev range, and to get torque, you need high gas speed at low revs. The only way to do this is to have smaller exhaust tubes. Basically, the standard exhaust is arranged into a 4 into 1 config (best for top end power) with the exup valve restricting the opening at lower revs to maintain gas speed and give more torque. Again, the overall config is not best for top end power (although 4into1) due to design constraints and the wish to give an overall, allround performance.
The full race systems, will give loads more power at top end along with increased mid range if the carbs are set up right. The bottm end is hindered by over fueling to agrevate the bottom end loss. You can make this a little better by increasing the size of the pilot jets however, the difference is minimal hence, they are not supplied with any tuning kit (dynojet, factory etc.)
My '99 Bike
I use this for going to the office and trackdays. On this I installed a fully Muzzy system supplied by FWR (http://www.fwr.co.uk) For a couple of reasons. Firstly, the whole system weighs in at an incredible 12Lbs, with a round, aluminum silencer. Is stainless throughout and only cost Ģ399.00! In addition, Muzzy do not quote 'Bullshit' figures suggesting more power from 5000RPM onwards (over standard) and a topend increase of 8-10%.
I did not buy a jet kit as the R1 has adjusterble jets. I made that mistake with my Thunderace! I called the nice chaps in technical services at Yamaha UK who told me the standardjet size is 130 and the needles are adjustible with 6 grooves, standard setting being number 3.
I use the same Dyno for all my bikes past and present which again, is not set up for bullshit 6000 HP figures. forget the 'acutal' horse power reads, only compare the before and after. My bike gave 128.3HP at the rear wheel as standard. with 135 main jets and the needles raised one line, the output increased on the dyno to 142.1 rear wheel horse power. A good increase.
This increase could be a little higer as the bike was running a little rich in mid range and over fueled a little more by the time it reached top end. With 132.5 main jets and half a needle lift instead of one (use a thin washer) the bike would have been there for summer. As I use this in winter and summer I left it.
On the road, the bike is fluffy below 4000RPM and will bog down if you try to pull away too quickly and let the revs drop below this mark. From 5000RPM it pulls cleanly and comparably to the standard machine and from 8000RPM any buddies that where next to you on their standard machines are gone.
When I first had this installed, I could enter the Donnington start/finish start behind a standard R1 ( aftermarket end can and standard headers) and be well in front at the braking point (1-2 bike lenghts).
I hope this is informative and useful to it's readers...:ugh
02-05-2002, 01:15 AM
Very good insite you just gave! Now I have a question. I plan on getting a Two Bro Full Exh Carbon High Mount pipe and a Stage 1 K&N jet kit for my 99. Will the stage one produce more power for me or whould I just have the pins turned like you said? Thanks for your help JJ :D
Dynojet do reshape their needles in order to flaten the power curve and take out any holes in the performance however, on my dyno chart (needles effect mid range power) their is no drop mid range infacrt a very good increase can be seen, around 8hp over stock at 7000RPM. I can not upload it at the moment as it is at home (UK) and I am on business in Cape Town, SA.
My suggestion is as follows:
I am not sure about pricing in Japan however, a dynojet kit here is around Ģ100.00 UKP. Four jeplacment jets can be purchase from a local dealer (1.325 instead of 1.30 (you may want to purchase two setts, buy 1.35's too, these will give additiona performance in winter)) for around Ģ6.00.
Ģ6.00 is a lto cheaper than Ģ100!! If you have a dip in performance as a result of simply leifting the needles, buy the jet kit!!
02-06-2002, 02:14 AM
I think I'll just get the Stage 1 so I will not have to hassle with it again if it doesn't work out for the best. I think you so much for all your insight JJ Talk at ya later.... :yesnod
02-06-2002, 07:50 AM
Just one word....torque. That's where all the fun is. Do you really care what the terminal speed of your bike is or do you yell "Yee Haa!!!" as you rip through the corners? The EXUP does a great job of developing torque while keeping high RPM power and you'll lose that if you go for a full system. You'll also need a box to fool the computer into thinking that the EXUP is still there.
I'd just go with a good can and a jet kit (or a PCIIIr for the '02 guys) Whatever you go for, get it dyno tuned too. You'll be amazed at what this will do for you.
02-06-2002, 09:06 AM
You'll also need a box to fool the computer into thinking that the EXUP is still there.
Letīs clear one thing out here. You donīt NEED that box, simply remove the exup wires and leave the rest. Yeah, I know some of you will say that you will loose som HP by not removing the servo, but we are talking about <1 hp here. Really, do you think you will notice ? But then there is the weight of course......... Skip that donut once a week and the effect will be about the same !;)
02-06-2002, 09:01 PM
the dynojet stage 1 kit is for stock can or slip-ons,not for full systems;you can get more hp,but it will be harder to tune and also be more sensible to temps changes.
02-07-2002, 03:22 AM
I hope that wasn't a dig on me with the donut thing since I'm a Navy Cop.?. :p But anyway so what do you guys suggest? Should I go with the full sys and a stage 1 or should I go with just a Two Bro slip on and a stage 1? I'm looking for an over all increase in power and torque. If I lose 1HP for doing it that's fine. I have to shut up a buddy who has a '02 GSX-R1000 (CRAP) who I can get off the line but he runs me down in about 3rd gear. I guess its from the ram air? But for one thing he can't touch me in the corners!!!!!! I have a V/H S-4 slip-on now but I don't like the sound so I'm going to go with the Two Bro. Very throaty, sounds damn good on the R-1. Please help!!!!! I'll take all the advise I can get.. Thanks Guys:D
02-07-2002, 04:07 AM
You have 2 choices.
a) Fit a decent full system such as a m4 or akroprovic & ivans carb kit (needles & uses 132.5 jets). Bike may loose power below 3000rpm, but will have more above that, and about 10->15bhp more at top end.
b) Fit decent race can & ivans carb kit (needles & keep stock jets). This will give you more power throughout the whole rev range, and about 6bhp->10bhp more at top end. You are keeping the exup valve, so the bike dont loose power down below and is smoother to ride.
I personally am going for option b, since i use the bike every day to get to work and want it to be drivable in traffic without me having to keep it above 4000rpm.
02-07-2002, 04:45 AM
a change of slip-ons wont get you in front(but you already knew that);the only thing to do is go with a full system and dial it using an EGA to tune the whole rpm range to perfection;simply dropping the best jetkit adjusted to "the std" wont give you the perfect,linear kick of the R1 with its exup valve still in place.
02-07-2002, 06:58 AM
oh so you a big :machinegu at home.....didnīt mean to upset you.........:D
turbonutter is right, those are the two options you have. But I donīt agree with him when he says go for option b. I choosed option a and got rid of the std exhaust AND the exup. And then fitted a full Acrapovic and ivanīs needles. Gave me about 12 HP more at top end. You will loose some hp below 3000rpm due to the loss of the exup, so in the end itīs all about what kind of driver you are. If you, are ike turbonutter then go for slip on and exup. If you, like me,have never even been below 4000 rpm ( ok maybe just passing by ) then ditch the exup, get a full system and beat the crap out of your friend !
Thats my humble opinion.....
02-08-2002, 01:59 AM
spot on maniac. :)
my mate went for a full micron system & dynojet kit. obviously not as much power or as good as an akroprovic & ivans needles, but even so, he could power wheelie in 3rd (mind you he only weighs about 140lb), although he had no power at all below 3000rpm.
02-08-2002, 03:08 AM
well on my first R1 I had a two brothers high mount slip on and a stage 1 jet kit and it was pretty fast I think I dont know how fast the other bikes with pipes go but mine did 80mph+ in first and in second it did about a little over 120mph in 2nd I bet that there is other R1's out there that are way faster than that but just wanted to give you an idea on what type of performance. Bye the way im an inexperienced rider so I bet somebody that can ride pretty good can do better than that
02-08-2002, 04:41 AM
well,we cant really;
top speed in each gears is dictated by gearing,not by overall power... :)
02-08-2002, 10:13 PM
If you want power, a full system is the only way to go. I have the full Akrapovic and IVAN's jet kit. It really is the easiest way to go about more HP. Any full system on an R1 will loose power at around 3,500 rpm. Thats the way it is. You will gain a huge ammount on top though. Not to mention getting rid of the cast iron header will shave 20 pounds.
The difference in stock and full system to me is this. On a stock header bike (slip on or not) you can go WOT (wide open throttle) in 5th gear at 2,000rpm and it will accelerate. It will accelerate slowly but it will pull. On a full system bike you will not be able to go WOT from such low rpm. If you do you will not accelerate. It really sounds worse than it is. You get used to it very quickly. With the Akrapovic the bike will start to pull clean from about 3,900rpm. At 5,000rpm it is killing a stock or slio-on R1, and in the upper RPM you will think you have gotton on a different bike.
I street ride, drag race, stunt ride, and everything else i get a chance to on my r1. it is as rideable now as it was stock. It just takes a few days to get used to the new way it will wheelie.:hellobye