I had a chance to get my P650 and Susuki Twin Peaks dyno tested this weekend. My P650 has a K&N filter, diamond snorkel, and a IDSX pipe. I have stock jets still in the bike and keep hereing about how each of these mod's need to also rejet. I figured since I have not rejeted and did all of these mods I would be running lean. They did a snifter test on the exhaust to check the jetting. the result was, my jeting was fine and if any thing I was a little bit rich not by much though they recomend leaving it like it is.

The STP700 was a littel richer than the P650 and the only mod on it was the K&N filter with stock jetting . I am going to have them recheck it after I get the procircut pipe system and new CDI on it. It check out at 3 HP more than the P650

The HP on the 650 was 43 and 22 at the rear wheels
The HP on the 700 was 45 and 25.23 at the rear wheels

I am not sure what the deal is with the rear wheel ratings but the guy told me it was the type of power train used on these bikes(it realy robbs alot a power from the motor).

I plan to have both of them retest after I get my CDI boxes installed on both of them.

 

thats cool, how did you get that chance?

 

There was a dyno set up down at the little sahara dunes last weekend. complete with an air / fuel ratio test machine that probes the exhaust gas durring the dyno test.

 

Slap on the V-Force!!!

 

cc1999,
Thanx for the informative post! I look forward to your next set of dyno numbers with the cdi boxes installed.

BTW, how much does it cost to dyno each quad?

Happy trails...[img]i/expressions/face-icon-small-smile.gif[/img]

 

Those are really good numbers. Way more than I thought they would be. What were your A/F numbers?

 

I am not familar with the what the air fuel #'s are telling me. They gave me a copy of the graph with a #13 as being the target line. the
STP700 was running between 11.5 to 12.5 they said it was little rich even with a k & n filter, however i am planning to put a pipe on it and a CDI.


the p650 was running between 12 and 13 they said that was good with a slite error to the rich side, they said they would not change a thing,

 

I read on the Jet4Power website that you will make maximum power with a 12.6 to 1 mixture. 15 to 1 for maximum economy.

 

Thanks Nova, that tells me that even after I change the pipe and CDI's It wil still be in a safe range if I am understanding those numbers right.

If 15 s still safe and a pipe,k&n filter,and a bigger snorkel only change my numbers about 1/2 to a full point and I am still a little rich, at under 13 I will most likely still be safe with the CDI boxes. I will still have them checked but I was afriad I would have to jack with thoses duel carbs. carbs and I don't get along.

 

UPDATE


Ok I finaly got 15 hrs on it so I took it in to have the first service and get it re-dyno tested now that it has the procircut pipe kit and cdi box on it. the rear wheel HP is now up to 34 and I found out since I was testing both times with my knobby tires on and not there racing slicks that you should always add at least 4 hp to what ever numbers you are producing to get a more true idea of the HP you have My mechanic said I was still in a safe range on jetting as a matter of fact he said I was all but perfect there, its running right at a 14 almost all the way through the test he said I should not tuch it as far as jetting. Its torque nubers were what were realy impressive to my mechanic its putting out about 56lbs of torque and has a top speed on the dyno @ 75.05 mph. I have not tested it for top speed anywere but the dunes and was getting about 63mph by the speedo there. I have always herd and witnessed a time or two with some of the other atv's that I have had in the past that you loose about 10 mph in the sand, and the looser the sand the more you loose. I am pretty pleased with the outcome of all my modds a procircut pipe kit inc. head pipes and a CDI box along with a KN filter (KN was on it durring the first test) I think thats working out to be about a 27% gain in HP for about 850.00 in modds.