Timing values for Link 2
12-13-2003, 02:20 PM
#31
Three Wheelin'
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Originally posted by NZ951
I just tried the plot that B951S modeled. I got a lot of audible knock... Have reverted back to the stock Link values, nice and safe at the moment. Anyone got a Link computer with decent timing values that would be somewhat suitable for my setup?
I just tried the plot that B951S modeled. I got a lot of audible knock... Have reverted back to the stock Link values, nice and safe at the moment. Anyone got a Link computer with decent timing values that would be somewhat suitable for my setup?
12-13-2003, 02:45 PM
#32
Race Director
Yup, using the stock dizzy. No mechanical advance to my knowledge. Boost set at 1.1- 1.2 bar. Not sure what the go is. It was not that loud, but noticable. Would you consider that boost too high? The af ratios were not bad either... just heard the detonation.
12-13-2003, 03:42 PM
#34
Drifting
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I've been eyeing that same cam as well.
I'd also like to point out the casual manner in which rage2 imparted the fact that he's got somewhat more than 100 ft/lbs over the stock car at essentially the stock boost level.
I'd also like to point out the casual manner in which rage2 imparted the fact that he's got somewhat more than 100 ft/lbs over the stock car at essentially the stock boost level.
12-14-2003, 12:05 AM
#37
Rennlist Member
Thread Starter
Originally posted by Danno
Also remember that these numbers are offsets from base-timing. Due to the adaptor-board for the stock-triggers on the flywheel, base-timing is actually not zero-degrees TDC. There's a calculation you can make based upon the 4-position binary switch that comes up with some number you multiply the 5 to use an offset from the reference sensor mark of 58.4-degrees. So you end up setting base-timing to 3.4-degrees BTDC or 1.6-degrees ATDC, but not absolute zero. Then your tables are degrees away from this mark itself.
Also remember that these numbers are offsets from base-timing. Due to the adaptor-board for the stock-triggers on the flywheel, base-timing is actually not zero-degrees TDC. There's a calculation you can make based upon the 4-position binary switch that comes up with some number you multiply the 5 to use an offset from the reference sensor mark of 58.4-degrees. So you end up setting base-timing to 3.4-degrees BTDC or 1.6-degrees ATDC, but not absolute zero. Then your tables are degrees away from this mark itself.
THis is from Danno.....I wonder how this translates into an actual offset value that we can put in the static timing variable.
Danno, can you help us Link2 guys out a little??? I am sure the answer is burried in your quote but I am not sure I fully understand how you could to alternative static offsets for a given sensor position? THanks in advance for your help.
12-14-2003, 11:51 AM
#39
Drifting
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NZ951,
Why don't you bust out an adjustable timing light and check to see what your actual timing is. If for example you've got 9 degrees @ idle programmed and you shoot it and let's say it's actually 13 degrees, then you've got both the answer to the offset question as well as the answer to why you're knocking with the stock timing values. Stock timing plus an extra 4 degrees advance equals knock.
Why don't you bust out an adjustable timing light and check to see what your actual timing is. If for example you've got 9 degrees @ idle programmed and you shoot it and let's say it's actually 13 degrees, then you've got both the answer to the offset question as well as the answer to why you're knocking with the stock timing values. Stock timing plus an extra 4 degrees advance equals knock.
12-14-2003, 01:55 PM
#40
In answer to the offset question, put the advance limit to 0, then check with a timimg light. this will tell the mechanical timing or offset value the pickup is in. this is what I do, as stated in link Manual. Remenber to adjust your map values to reflect the offset numbers.
If you have the Link 2, why don't you use the knock system to help you. That is what I am doing on my 930. Set the knock threshold number, then above this number the ECU pulls timing back. Although I did not set this up, it works great. I have seen where I have changed fuel octane values and the computer has pulled out timing, in my case almost 4 degrees. I think the Link will pull out up to 6 degress, then ask you to store the change, before it will continue to pull timing out. Remenber also, as soon as you power down the ECU, the original timing values are reset. This is a great system. Use it if you can. The aircooled engine really likes to detenate so this is really a great advantage.
If you have the Link 2, why don't you use the knock system to help you. That is what I am doing on my 930. Set the knock threshold number, then above this number the ECU pulls timing back. Although I did not set this up, it works great. I have seen where I have changed fuel octane values and the computer has pulled out timing, in my case almost 4 degrees. I think the Link will pull out up to 6 degress, then ask you to store the change, before it will continue to pull timing out. Remenber also, as soon as you power down the ECU, the original timing values are reset. This is a great system. Use it if you can. The aircooled engine really likes to detenate so this is really a great advantage.
12-14-2003, 03:10 PM
#41
Race Director
I will use the knock control for sure. I am going to set it up tomorrow. I dont have a timing light, so will do it with my mechanic when we install my cat back tomorrow.
Andrew
Andrew
12-14-2003, 03:36 PM
#42
Race Director
Ok. The timing values in the Link represent degrees additional to what the stock timing is set to. Lets say the current stock is 10 degrees, then adding a Link timing value of 15 into a cell will give you 25 degrees. Anyone know what the stock timing is?
12-15-2003, 10:26 AM
#44
Drifting
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Originally posted by NZ951
I just tried the plot that B951S modeled. I got a lot of audible knock... Have reverted back to the stock Link values, nice and safe at the moment. Anyone got a Link computer with decent timing values that would be somewhat suitable for my setup?
Yoww! 18 degrees (B951S's map) plus 16 degree on the stock chip = 34 degrees advance @ 1.2 bar! Danger Will Robinson, Danger.
I just tried the plot that B951S modeled. I got a lot of audible knock... Have reverted back to the stock Link values, nice and safe at the moment. Anyone got a Link computer with decent timing values that would be somewhat suitable for my setup?
Yoww! 18 degrees (B951S's map) plus 16 degree on the stock chip = 34 degrees advance @ 1.2 bar!
Danger Will Robinson, Danger.
12-15-2003, 12:00 PM
#45
Rennlist Member
Thread Starter
Russ
The link timing values are not additive to the stock. The stock computer is gone as the link is a stand alone. The values I rolled out are absolute and I think needed the static or mechanical advance of the engine subtracted.
The link has a static advnce variable. I believe that why NZ got knock as he put abosolute values in the link and then the static advance was being added to them. Somthing like that anyway....My map is as close as I could model the absolute stock S timing into a Link template. The actual transaltion / conversion needs some though to ensure the resulting absolute values are right. Danno....Superjet...chime in guys..
The link timing values are not additive to the stock. The stock computer is gone as the link is a stand alone. The values I rolled out are absolute and I think needed the static or mechanical advance of the engine subtracted.
The link has a static advnce variable. I believe that why NZ got knock as he put abosolute values in the link and then the static advance was being added to them. Somthing like that anyway....My map is as close as I could model the absolute stock S timing into a Link template. The actual transaltion / conversion needs some though to ensure the resulting absolute values are right. Danno....Superjet...chime in guys..