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Old 11-17-2010, 08:19 PM   #1
grinns OP
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4-5k hesitation

The bike has had a 4-5k hesitation off and on riding back from houston, but now it has it perminently.

Here is what I have done so far:
valves adjusted
sas removed
new airfilter/prefilter
new fuel filter
new 02 sensors (one was bad found with tuneECU)
reloaded newer stock map and reset settings + 15 minute idle

What I plan to do:
tps sensor adjustment (is this possible?)
balance throttle bodies (they measure off a little in tuneECU)

Right now after new o2 sensors and reset its running amazing, but the hesitation is still there. It feels like the injectors shut off because it thinks the throttle is closed.

SUMMARY AND FIX IS ON PAGE 3
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Old 11-17-2010, 11:33 PM   #2
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Two things I would recommend for that:

1. Disable the EPC either by removing the pins in the harness for the gear position sensor, or disable it in the map.

2. Remove the secondary throttle plates in the throttle bodies.

You will see the largest difference by removing the secondary throttle plates. You also could change the mapping for the secondary throttle in TuneECU.
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Old 11-18-2010, 01:15 AM   #3
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Quote:
Originally Posted by grinns
The bike has had a 4-5k hesitation off and on riding back from houston, but now it has it perminently.

Here is what I have done so far:
valves adjusted
sas removed
new airfilter/prefilter
new fuel filter
new 02 sensors (one was bad found with tuneECU)
reloaded newer stock map and reset settings + 15 minute idle

What I plan to do:
tps sensor adjustment (is this possible?)
balance throttle bodies (they measure off a little in tuneECU)

Right now after new o2 sensors and reset its running amazing, but the hesitation is still there. It feels like the injectors shut off because it thinks the throttle is closed.
Yes you can adjust the TPS
the voltage should be rond 0.6-0.7V when closed en 3.6V when fully opend. it's in the manual

but you should do this after you balanced the throttle bodies.

Maybe also check if there isn't any thing loose on the throttle bodies
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Old 11-18-2010, 02:59 AM   #4
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Try removing the secondary butterflies,I had a similar lag at that rev range which this resolved.
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Old 11-27-2010, 06:59 PM   #5
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After doing some more reading when its doing this hesitation it should be using the map based on the Map sensor (L table). It shouldn't switch unless its above 67% tp at this rpm range according to my stock map.

I looked at the secondary positions and it starts changing a little more rapidly at this rpm.

My next test would be to datalog or view this info when the hesitation happens.

If anyone knows anything interesting as this is the first time I am diving all the way in fuel injection please yell.
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Old 11-27-2010, 07:25 PM   #6
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Throttle boddies are like 70 hPa different at idle. Need to find out that issue. The sensors are only off by 1 when bike is not running.
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Old 11-27-2010, 07:34 PM   #7
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Quote:
Originally Posted by grinns
Throttle boddies are like 70 hPa different at idle. Need to find out that issue. The sensors are only off by 1 when bike is not running.
It's around 50-70 hPa off all rpms while running. Doing some more thinking...
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Old 11-27-2010, 07:36 PM   #8
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I am going to swap the sensors and see if it follows.
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Old 11-27-2010, 09:00 PM   #9
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Didn't follow, so I synced the throttle bodies. They indicate the same now, but idle went up and you can see the TPS is off now.

Tps adjustment to follow after I make an allen key a little shorter and bent.
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Old 11-27-2010, 09:14 PM   #10
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Old 11-27-2010, 09:50 PM   #11
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Quote:
Originally Posted by wee tee cee
Try removing the secondary butterflies,I had a similar lag at that rev range which this resolved.
If you have Tubeboy or TuneECU you can program the secondary butterflies to be open all the time without having to remove them. Very handy to be able to go back and forth quickly to figure out if it really helps or not.
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Old 11-28-2010, 01:16 AM   #12
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Quote:
Originally Posted by grinns
Didn't follow, so I synced the throttle bodies. They indicate the same now, but idle went up and you can see the TPS is off now.

Tps adjustment to follow after I make an allen key a little shorter and bent.
Don't forget to take some snapshots for us NooB's..

edit: found some pics on the duke site.





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Old 11-28-2010, 01:27 AM   #13
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add content

Quote:
Originally Posted by grinns
After doing some more reading when its doing this hesitation it should be using the map based on the Map sensor (L table). It shouldn't switch unless its above 67% tp at this rpm range according to my stock map.

I looked at the secondary positions and it starts changing a little more rapidly at this rpm.

My next test would be to datalog or view this info when the hesitation happens.

If anyone knows anything interesting as this is the first time I am diving all the way in fuel injection please yell
.

Is this something that needs looking at... Linky

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Old 11-28-2010, 10:08 AM   #14
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Quote:
Originally Posted by Dusty
Is this something that needs looking at... Linky

Thats pretty cool, but this is more like what I want. I would need to tune more bikes than just my own to make it worth it :).http://www.innovatemotorsports.com/x...cat=273&page=1
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Old 11-28-2010, 10:17 AM   #15
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http://compare.ebay.com/like/1805842...=263602_304662

and anouther 9k for a dyno! Thats a lot more bikes!
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