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- - Dyno results ( https://www.xt660.com/showthread.php?t=3215)

Quote:

Originally Posted by Kev (Post 47181)

Sorry zzzak, I don't know what I was thinking :100::eusa_wall::whip2::catfight:, you are quite correct. It needs to be made richer not leaner. I have corrected my reply.

Turn up the fuel mod clockwise to lower the temp sender reading, by a futher 5 degrees.

I only have another 2 degrees of adjusrment then I hit the stop.

Quote:

Originally Posted by zzzak (Post 48668)

I only have another 2 degrees of adjusrment then I hit the stop.

I think Frezz is right I have never seen a XT660 run that lean & produce the hp it does.

Set you CO1 reading -5 to -15 below the actual dash reading, take the reading with the mod turned all the way anti clockwise then turn the mod clockwise between -5 & -15, that's if the dyno readings were correct.

If your bike is running fine & is not surging & running like a pig at all rpms as it should with the readings you posted, I would leave the mod where you had it.

Thanks,I'll have a play around.

Hi There,

My bike has been on the dyno today. The tuning guy has created a new map for the powercommander, using the tuninglink software.
Af ratio has been set on 13,2

Bike 2006 model, Purchased (new) in april 2007
Now 12000 km, akrapovic (with modified db killers), dna filter, k&Nfilter, powercommander. gear ratio 15 48

The bike runs very smooth now

Output 52 rearwheel ponies and 67 nm torq
http://img90.imageshack.us/img90/3166/rollonvv4.jpg

What would be the standard amount of rearwheel ponies?

46 or something?

Final results for the XT660X to Raptor + Stage 1 Hot Cam conversion.

http://i201.photobucket.com/albums/a...alresults1.jpg

A before & after dyno run with just the Raptor 700 Cylinder 102mm & 11:1 piston kit.

http://i201.photobucket.com/albums/a...onlyPeekHP.jpg

http://i201.photobucket.com/albums/a...igboreonly.jpg

The difference between a Stage 1 Hot Cam & a XT660X with the big bore kit.

http://i201.photobucket.com/albums/a...etweencams.jpg

http://i201.photobucket.com/albums/a...HotcamXTX1.jpg

As you can see from the results, the Raptor big bore kit offers a big gain in torque & HP over the standard XT660. Add a stge 1 Hot Cam & you have great mid to top end power, but with a loss in HP & torque low down.

As I have said before big HP does not mean the motor will be good across the whole RPM range, you need to decide how you ride & where you want the HP & torque.

If you ride 80% of the time below 5500RPM then the big bore is the way to go 3 more HP at peak with a big gain in torque, if you ride on the stopper all the time the Stage 1 & big bore is for you with just around 57HP at peak.

If you are going to fit just a Stage 1 Hot Cam, you would be looking at around 4.63 HP gain at peak power & a gain of 7.14 HP at the rev limiter. But with a loss of 3.98 at the bottom of the rev range.

You know me Kev, I am not such a techno head when it comes to these charts, they look pretty impressive, I admit, but my simple mind only asks these 2 questions:

on an open road, what is the top speed difference before and after and...

on a full tank how many miles you get in consumption now that you have a more powerful engine compared to what you used to get before the conversion?

Thanks for clarifying.

Fran

Quote:

Originally Posted by CaptMoto (Post 55013)

On the open road the stage 1 cam will win hands down, it pulls like a train all the way to the rev limiter, once I can ride properly I will post the difference in fuel usage.

Damn!!!

I am shocked at how much Torque and low down power you loose with the stage 1 cam.

Normally when you add a stage 1 cam to a raptor 700, it gains quite a bit of midrange power over the stock raptor cam.

It seems the XT cam is a torque monster, which is great for riding in traffic and off-road.

I have to be honest. I love low down torque and I hardly ride over 140 km/h so for me, the raptor cams seem to be a big disappointment for my riding requirements.

Kev, where you able to measure the cams before installing them? Would love to know what differences in duration and lift there is between the two cams.

Next question. According to the dyno, doing porting on the raptor head will add around 2HP. The new 08 model raptors have revised heads from the factory and they make 2HP more than the previous models.

Maybe, going for a ported head with the stock xt cam might be the best overall option with both torque and HP. It might not make as much top end power as the stage 1 cam, but it should but it much closer at the top end and keep or even improve midrange power of the stock XT cam.

I will post some pics of new custom intake valve I had specially made for 2 raptor heads I am working on.