Post your timing map

[Guest SBD]

Can I see some timing maps from you guys? Post your engine/head + mods too!

[Guest Loose_Screws]

SBD is a great tuner who has been initiated into the world of MS and L28's. We are having some discussion as to the timing we should be running on my L28ET. Currently, it is max timing of 36degrees, with 1 degree of retard for every 1psi of boost (max. of 18psi). But, what about before, after, and during torque peak? During torque peak is the most volatile time for detonation, so timing needs to be limited, correct? But, after torque peak, VE falls, so timing can be increased again? Has anyone tested this theory with their L28? Any input?

 

My current MS .MSQ can be found in the following thread

http://forums.hybridz.org/showthread.php?t=103145

 

SBD and I are going to see just how much power can be made with a standard T3 on a fairly stock L28 block/heads/pistons utilizing a large FMIC, MS, MSD 6A, and 440 injectors.

[Guest Loose_Screws]

Here is the timing table I am about to load.

 

 

L28, turbo pistons, P90 head, FMIC, MSD 6A, T3 @ 15psi.

[yo2001]

Remember, L28 came with like 3 different head chambers over the years. (close, simi-hemi, open)

All different head is going to require different timing. compression. Depending on fuel too. So the arguments sake, all must be timing for 93 octane. Open likes more timing, and close doesn't need as much timing but open can make more power if there is enough octane in the fuel. (I read that from JohnC post??)

 

P90 is the close chamber with standard of 7.8:1 compression?

[TimZ]

Just an observation - how much vacuum do you plan to have at idle? Your map goes all the way down to 20kPa, which is about 24inches of vacuum.

 

If your engine doesn't pull that much at idle, then you might be better off starting at a higher kPa and giving yourself more resolution where you can actually use it.

[Guest Loose_Screws]

Just an observation - how much vacuum do you plan to have at idle? Your map goes all the way down to 20kPa' date=' which is about 24inches of vacuum.

 

If your engine doesn't pull that much at idle, then you might be better off starting at a higher kPa and giving yourself more resolution where you can actually use it.[/quote']

 

I am pulling 18 to 20 in/hg at idle (~38kpa). And pull 12 to 15 in/hg cruising.

 

I agree, I probably do not need much resolution down low. Once we get some better tuning, I'll try shifting values around and see what quality can be gained.

[Guest SBD]

How does the timing feel now? We really got a lot of work to do. Let me know when you are back in town.

[Guest Loose_Screws]

How does the timing feel now? We really got a lot of work to do. Let me know when you are back in town.

 

SBD took away my timing and the car don't pull as good now at 10psi. I think I had it set to like 30 degrees or something wild at 10psi. Car pulled good, no detonation, but gotta be safe!