AVCS - Intake and Exhaust Timing

[KoolBRZ]

Originally Posted by mad_sb

Here is a starter image that combines the pdf data with the stock cam maps. I know they say "safe" but logging has confirmed over and over these are the maps used 99% of the time, lots to fill in with max overlap areas etc. I have some basic zone overlays but i want to study the info some more.

I noticed that your stock safe maps aren't the same here as what you showed in this thread. http://www.ft86club.com/forums/showthread.php?t=29679 . They are slightly different. I've been tweaking the VVT for the last few days, and it's gone from sad to lame. I found these threads doing a search for avcs tuning. I copied the numbers from your stock tune, (Stock_IAM1.hex)'s tables into my OFT stage 2 UEL 91 oct tune's safe maps for intake and exhaust, but I left the tune's maps alone for the normal and base tables. My car runs undeniably better. Try it yourself if you have the time to open an OFT tune, change half the cells of each table, and save it as a BRZedit-able tune. I'm glad I have an OFT and that I took a chance inputting your stock tables.

[Grip Ronin]

So how do the safe angles affect normal driving?

[KoolBRZ]

Originally Posted by Grip Ronin

So how do the safe angles affect normal driving?

If you're not FI or running E85, try opening your OFT OTS tune up in RR and change your tables to match mine and see how it affects your normal driving. I used to think safe tables were for normal driving and normal tables for sport button driving, but now I'm not so sure.

[s2d4]

Yeah, not copying that.

[Kodename47]

Originally Posted by KoolBRZ

If you're not FI or running E85, try opening your OFT OTS tune up in RR and change your tables to match mine and see how it affects your normal driving. I used to think safe tables were for normal driving and normal tables for sport button driving, but now I'm not so sure.

Base = base timing and used if IAM is low (<0.4 standard)
Normal = IAM >0.4 and <0.8
Safe = IAM >0.8

[KoolBRZ]

Originally Posted by Kodename47

Base = base timing and used if IAM is low (<0.4 standard)
Normal = IAM >0.4 and <0.8
Safe = IAM >0.8

So safe means it's safe to crank it up, normal means it's not running the best, so here's a table that won't ping, and base means something's F----d up and this will keep it running without pinging till it can be fixed.

[Kodename47]

Originally Posted by KoolBRZ

So safe means it's safe to crank it up, normal means it's not running the best, so here's a table that won't ping, and base means something's F----d up and this will keep it running without pinging till it can be fixed.

Pretty much, the idea being that you'd run a more conservative normal and base timing tables. I believe that even the stock tables mirror each other so they will always run the same no matter what anyway. On ECUtek they are called base, high det and low det which gives it away a bit better

[Grip Ronin]

Originally Posted by KoolBRZ

If you're not FI or running E85, try opening your OFT OTS tune up in RR and change your tables to match mine and see how it affects your normal driving. I used to think safe tables were for normal driving and normal tables for sport button driving, but now I'm not so sure.

Ok so what kodename just said makes sense because i never knew what those tables ment.. ill have to try some new ideas i have and test it tonight

[D-VO]

Does anyone have input on AVCS settings for supercharged engines? I've been messing around with retarding both the intake and exhaust, but my IAT's with the weather change have been screwing with the results. I'm also using VDR which doesn't account for inclines and declines on the road. Thanks!

[thambu19]

Originally Posted by D-VO

Does anyone have input on AVCS settings for supercharged engines? I've been messing around with retarding both the intake and exhaust, but my IAT's with the weather change have been screwing with the results. I'm also using VDR which doesn't account for inclines and declines on the road. Thanks!

If you have a blower I would assume you would want the Exhaust to open early to allow for a better blowdown to get the excess air that you have now with the blower out of the engine and hence lower incylinder residual gases. As far as the intake goes you want the intake valve to close just past BDC at low engine speeds and you start retarding the Intake as you go up in rpm. You may not need to retard as much as a NA engine has to though since you have a blower. But keep it linear with engine speed since you are not relying on tuning anymore.

[KoolBRZ]

Here are the latest AVCS tuning maps I have developed. Although they are works of art, I am sure they are wrong in any number of places. I'm opening up my work here for criticism, not my personal life, so keep it respectful. Although I developed these maps while NA, I'm still using them with a Phantom ESC. If you have any suggested changes, describe them, post pics, and I'll make the changes and try them out. If you want a tune with these changes already in them, or an xml definitions file to enable extra tables, just ask and I'll post it if I have it or if I can make it. The pics are in order; Exhaust Safe-Exhaust Normal, and Intake Safe-Intake Normal

[thambu19]

@KoolBRZ how much boost are you running

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[thambu19]

Originally Posted by KoolBRZ

Here are the latest AVCS tuning maps I have developed. Although they are works of art, I am sure they are wrong in any number of places. I'm opening up my work here for criticism, not my personal life, so keep it respectful. Although I developed these maps while NA, I'm still using them with a Phantom ESC. If you have any suggested changes, describe them, post pics, and I'll make the changes and try them out. If you want a tune with these changes already in them, or an xml definitions file to enable extra tables, just ask and I'll post it if I have it or if I can make it. The pics are in order; Exhaust Safe-Exhaust Normal, and Intake Safe-Intake Normal

If it was me I would start with the OFT Tune for Exh cam and subtract somewhere between 2-5 degrees (Earlier opening or less retard) from it. This is because with the SC you now have more air flow and need a stronger blowdown to get rid of the exhaust gases. Regarding intake depending on the boost you are running you may not need as much overlap as a NA engine. With a ton of overlap you might just be blowing air straight into exhaust.

[KoolBRZ]

Originally Posted by thambu19

@KoolBRZ how much boost are you running

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About 3 psi. The Phantom only makes from 3 to 5 psi.