Adjusting Decel Enleanment with the SEST - Harley Forum

08roadglidejoe · #1 09-12-2009, 09:02 PM

I had my 2008 RG dyno tuned. He runs great. The only trouble I have is with decel pop. The popping is not severe. I have had the bike back to the tuning people twice for more tuning. They have told me they have done the best they could with the pipes I have (huh?). Well ok I guess (sounds fishy to me). I have V&H classic slip-ons that turn down. I have read several of the posts that relate to decel pop. I decided to purchase the SEST cables, software and training DVD. I went back to the people who did the dyno tune and got the file they flashed to my ECM.

I watched the training DVD (Lots of info. Glad I bought it) and pulled up the decel enleanment table. The contents of my decel enleanment table are the same as the the decel enleanment table in the default file (I looked up which file was for my bike with the SEAC and racing pipes) on the SEST software CD. Therefore, I am assuming they never even looked at the table. Who knows maybe the adjusted the values and ended up setting them back to default.

I understand that increasing the multiplier will increase the amount of fuel being removed. Decreasing the multiplier will decrease the amount of fuel being removed. The table reads as follows:

ENGINE TEMP (C) / MULTIPLIER
-16 = 1.000
0 = .984
16 = .953
32 = .898
48 = .758
64 = .602
80 = .531
96 = .492
112 = .461
128 = .461
144 = .461
160 = .461

So 96C is 205F and 122C is 234F and 128C is 262F. I do have a oil cooler on my bike, but I do not have a oil temp gauge. I was thinking about INCREASING the values for 96 and 112 to .531 and see what happens. Is that too much? Should I increase the value for 80 also? Or am I going about this all wrong?

VRYQUIK · #2 09-12-2009, 09:57 PM

Quote:

Originally Posted by 08roadglidejoe

I had my 2008 RG dyno tuned. He runs great. The only trouble I have is with decel pop. The popping is not severe. I have had the bike back to the tuning people twice for more tuning. They have told me they have done the best they could with the pipes I have (huh?). Well ok I guess (sounds fishy to me). I have V&H classic slip-ons that turn down. I have read several of the posts that relate to decel pop. I decided to purchase the SEST cables, software and training DVD. I went back to the people who did the dyno tune and got the file they flashed to my ECM.

I watched the training DVD (Lots of info. Glad I bought it) and pulled up the decel enleanment table. The contents of my decel enleanment table are the same as the the decel enleanment table in the default file (I looked up which file was for my bike with the SEAC and racing pipes) on the SEST software CD. Therefore, I am assuming they never even looked at the table. Who knows maybe the adjusted the values and ended up setting them back to default.

I understand that increasing the multiplier will increase the amount of fuel being removed. Decreasing the multiplier will decrease the amount of fuel being removed. The table reads as follows:

ENGINE TEMP (C) / MULTIPLIER
-16 = 1.000
0 = .984
16 = .953
32 = .898
48 = .758
64 = .602
80 = .531
96 = .492
112 = .461
128 = .461
144 = .461
160 = .461

So 96C is 205F and 122C is 234F and 128C is 262F. I do have a oil cooler on my bike, but I do not have a oil temp gauge. I was thinking about INCREASING the values for 96 and 112 to .531 and see what happens. Is that too much? Should I increase the value for 80 also? Or am I going about this all wrong?

Before changing your map, make sure that you don't have any exhaust leaks. Check the tightness of the header bolts where the pipe meets the head.
I would highlight the whole column and increase them 5 points. Test ride the bike and see if it improves or not. If it is worse, go the other direction. If it improves it but not enough, increase it a little more.

08roadglidejoe · #3 09-12-2009, 10:36 PM

I did tighten the header bolts previously and even took the slip-ons off and put the RVT stuff on the pipe and put the slip-ons back on. I will raise them all 5 points and see what happens.

Thank you.

P.S. Do you mean .5 or 5.0

VRYQUIK · #4 09-13-2009, 12:03 AM

Quote:

Originally Posted by 08roadglidejoe

I did tighten the header bolts previously and even took the slip-ons off and put the RVT stuff on the pipe and put the slip-ons back on. I will raise them all 5 points and see what happens.

Thank you.

P.S. Do you mean .5 or 5.0

move them 5 units

08roadglidejoe · #5 09-14-2009, 10:54 PM

I am still playing around with the decel enleanment values. Next I am going to try to adjust the 1500-3500 rpm cells in the 20kPa column of the AFR table.

I appreciate your help Vryquik.