Anyone Dynoed their XJ?

As I am about to put Fuel Injection on Pumba, I have decided to do a Dyno run with the carbs on to give me a baseline for performance comparison.

Anyone dynoed their XJ? How was the power output compared to factory specs?

I'm guessing I will get about 60hp for Pumba, but will know in the next few weeks.

 

Nope, no dyno here. Just the seat of my pants is all I use. I'm not racing it, just joy rides. It seems to run good enough for me.

 

I think that's an excellent idea to baseline it first. From what I've read, you'll have been the only person to do it! I've read of other sucessful FI conversions but no one that I've heard of has taken the time or effort to go ahead and baseline it first. Kudos' to you!!

I've dyno'ed bikes in the past and every single time, was disappointed by the results. I used to look at the results as a measure of my skills and not as the measuring stick. Once I changed my outlook and began using it for the tool it is, it stopped being an emotional experience.

If you've never taken a machine up to have it measured, best thing I can tell you is not to get upset if the numbers don't fall where you had expected them to be. It will also show you how far off the built in seat-of-the-pants dyno we all have really is. I've seen guys swear in disbelief after I told them that removing the baffles on their two stroke had killed the power. Ronny dyno'ed his GT and found he had lost over 12 peak HP.
Or that increase in intake noise from installing pods does not equate to an actual increase in HP.

I've thought about dyno'ing my turbo after someone here recently suggested it but it's such a strain for a/c'ed turbo'ed machines, I would only let them do one run if I decide to do it. The turbo gets very, very hot and won't shed the heat if they turn off the fans when complete. Even the few times I've ridden it, I'm always careful to have some distance to go before getting home before getting the boost into the serious range...just to give it a chance to cool down.

Have fun and talk with them before they take your bike....and be sure that they plan on winding it back down slowly instead of chopping the throttle. It's very hard on the engine to do that when the only cooling is provided by fans.

jeff

 

Yes, my 86 Maxim-X 700 was dyno'd before I got it for what ever reason, and I'm amazed at the outcome, compared to "official" specs as to what the bhp should be, and what it was registered at....

Are you ready for a shock?..... What's the "official" bhp?... Around 86-92 bhp??

Mine came back with 102BHP!!!!! Yes, you read correct....102BHP

 

A while back Schooter did a race run on a dyno with his and posted it here:my dyno drag vid
Unfortunately it looks like he deleted or moved the video :?

 

I may be one of the few that had a fully working carb set up before the conversion.

Don't forget a large amount of EFI conversions are started to avoid rebuilding the carbs.

 

You're right, I never considered that. I just figured it was because folks were in a hurry to get to work

102bhp + pumping/trans losses@12% +15-20% shaft loss = 137Shaft HP more or less a few? That's more then a Suzuki Bandit 1200, and just a dozen less then a VMax. Maybe it was breathed on before you got it......


jeff

 

It certainly may have been. A friend has a 1200 bandit, and when I open mine up, he has dificulty keeping up, and there's no way on earth he can lose me if he's in the lead, the only time he can is if I back off the throttle, which I do do. It really miffs him.

Quite a few people have asked if it was the R1 or ex-up engine thats in it, and are quite surprised when I tell them it's only a 700, and yes, before anyone asks, the numbers on the frame, engine and reg papers all tally with each other

 

thats impressive smurf. i had a '01 gsxr 1000 that had 139 on the dyno and that thing was like ridin around a formula 1 car lol

 

Thanks, as I said, it was dyno'd before I got it, but she certainly moves, very much like you say, like a formula 1 car. 0-100 easily within 3.2 seconds. From a standstill, it's a case of starting off normal, giving her some throttle, going through the gears and hanging on for dear life lol.

 

is that with pods or without ?

 

Don't know who has been blowing smoke up your shirt there is absolutely no way your bike makes over 100 bhp. It is physically impossible. Your buddys bandit 1200 maybe makes 100 bhp thats if it has had some work done. From a dead stop race your buddys 1200 bet you wont win. There is only a few 10th of a sec between them thats only 3-4 bikes in a 1/4 mile.
A dyno does not measure bhp it measures rwhp. If your bike made that kind of power it would be in the same league as a vmax. Like what jeff said someone would have to do a lot of performance work and i mean a lot. But guess what no one makes performance parts for a maxim x.

Oh yea a hyabusa goes 0-100 in 3.15 sec
I had a vmax with a bunch of work done after 43 dyno runs it made 125 rwhp thats about 10 shy of what your making and it was up about 10 hp then others with the same work
Not trying to put your bike down. I have 1 also. For your bike to put down that kind of power you would have to rev it till adleast 15k with parts that no one makes for it. I have done some work with dynos. Motors have come along way since 1985

 

No bike can do that without pods. It's science.

 

I knew someone would be all over it .....I just knew it didn't have to be me this time<LOL>!!!

I hear guys tell me " back when I had my H2, if I was going along at 50 mph in 5th gear and cracked the throttle, I could hardly keep the front wheel on the ground"

Well, I have two of them, one showroom stock and one very highly modified (even has pods PO so we know it’s at the very upper limits of power).....and as you probably guessed, neither will power wheelie in 5th gear. I don't bother to embarrass them…

I read a post online from a forum a few weeks back where a guy who apparently owned a Yammy 650 turbo had written “ I got tired of doing a wheelie and a burnout at 85mph when it was on full boost” Swear to God, that’s what he had written……personally, the only person I ever saw do that and remain in control was Kenny Roberts but that’s what the guy had claimed.

Guess what….yup, even at nearly 20pounds of boost mine doesn’t wheelie&burnout at 85mph….it does move quickly but no burnouts at 85mph, I’m very disappointed…..shoulda put pods on it<LOL>

jeff

 

Yes happens to people too ,as in the older I get the better I was.

 

I knew a guy that had a belt-driven Drouin supercharger on a 750 Norton Commando. It could do burnouts at 70, well leave black snake marks on the pavement anyway, but no wheelies. And until the revs came up enough for it to be seriously on boost, a stock bike was quicker.