SD2 tuning

[TexasT]

Agree on the pump pressure, also the tv setting, where you are at with the over pressure valve, and any internal leaks be it at the vb or else where. Every trans is different.


Very excited to see the stuff from bg. I guess Ken is going too? Should be a wild time.


And Like Steve posted. Be careful of who you listen to. Many just roll on theory. Actually laying down a number is way more difficult.

[Steve Wood]

Sounds like a good plan to me...hope you have a blast at BG

[Steve Wood]

Jason,  be sure you have someone hold the pedal on the floor in the car while you look into the throttlebody to be sure the blade is very close to wide open...some times the cable stretches and you don't get the blade fully open...a few degrees off is okay...just not 20

Rich, wide open throttle comes from the LV8 number so you can have full fueling sometimes at something like a tps reading of 2.8v or so.

[good2win22]

No leaks that I'm aware of. TV is set for a nice comfortable shift. Not harsh but firm at the expected mph for light throttle.


Ken is going. The Botkol brothers, Jack Laswell and a few others from the DFW area. I can't remember their names.


I'll check that throttle blade. Thanks for the heads up!

[Scoobum]

Brad, have you ever noticed that some of the smartest people we know never seem to go fast?

they get so hung up with theory that they ignore what works.

I was installing the belts in the car today thinking about how best to answer...here it is.

https://www.youtube.com/watch?v=tKT-eWMWXOE

[Steve Wood]

 

[daveismissing]

I was installing the belts in the car today thinking about how best to answer...here it is.

https://www.youtube.com/watch?v=tKT-eWMWXOE

*Like*
Props for not subjecting us to another trailer-park clip.

[Scoobum]

I was installing the belts in the car today thinking about how best to answer...here it is.

https://www.youtube.com/watch?v=tKT-eWMWXOE

*Like*
Props for not subjecting us to another trailer-park clip.

C'mon Dave...SING!!!!!!!!!!!!!!!!!


https://www.youtube.com/watch?v=_mKPCJUW2I4

[good2win22]

Can someone explain how SD2 differentiates a WOT AFR setting for closed loop between high gear and low gear or if it even does?  As far as I can tell, as soon as the TPS goes over 4.2 volts, it sticks to the AFR set for WOT regardless of mph. Depending on map, it uses a different fueling table but sticks to the WOT AFR setting.

[Scoobum]

Vid from Eric...not sure if it's what you're looking for. I would hit the other board and send him a PM.

https://www.youtube.com/watch?v=sWUqfOCI6gU

[good2win22]

Vid from Eric...not sure if it's what you're looking for. I would hit the other board and send him a PM.

https://www.youtube.com/watch?v=sWUqfOCI6gU

Thanks Brad!  I've watched that clip a few times. The top row on the VE table is RPM and the column on the left is MAP. My understanding is that when you're in the high rpm and high MAP area in low gear vs high gear, meaning you're in the same cells only moving thru them at a faster rate in low gear vs a slower rate in high gear.  Pulling fuel from the VE table in that area pulls fuel no matter what speed your at. So by pulling fuel in that area makes the fuel correction change but not the AFR. Does that make sense? 


Think of it this way. I target 770 on the NB for WOT at the traps but do to the mechanical advantage of the gearing in the transmission, I don't need that much fuel in low gear to obtain that targeted 770 on the NB but my TPS still tells the ECM that I'm at WOT.


The 5.7 chip somehow uses the speed sensor to adjust timing and fuel in low gear. The timing works great but as you know, you can't pull enough fuel out of low gear. I just haven't figured out how the SD2 does it or if it does it all. Eric asks if the speedometer reads correctly, +- 10 mph, when ordering the 5.7 chip.

[Scoobum]

I know for a fact that SD2, XFI, CBS, NBC or The Counterfeit News Network won't make my car go any faster...so I don't bother with it. Eric has zilch for feedback...so he takes an educated guess on fueling. This chip needs about 10 percent low gear fuel removed...and about 10 percent high gear fuel added. I added the full 20 percent high gear fuel when the humidity was in the 30's...thus making the low gear fueling richer...cuz when you add or subtract high gear fuel...it adds or subtracts it right across the board...and I already have the full 20 percent low gear fuel pulled. Track closes for the winter at 5pm on the 14th next month. The chip will be in the mail to him on the 15th.

The only thing that matters is that you know SD2 inside and out...so you can tune the car all on your own. You're a smart guy...and I know you'll have it wired for sound fairly quickly.

[Steve Wood]

Vid from Eric...not sure if it's what you're looking for. I would hit the other board and send him a PM.

https://www.youtube.com/watch?v=sWUqfOCI6gU

Think of it this way. I target 770 on the NB for WOT at the traps but do to the mechanical advantage of the gearing in the transmission, I don't need that much fuel in low gear to obtain that targeted 770 on the NB but my TPS still tells the ECM that I'm at WOT.

TPS is not used by the ecm for wide open throttle fueling.  Performance Enrichment fueling is handled by the Load Variable.  If the TPS was used, we would get a very rich mixture in idle conditions when blipping the throttle.

You can set the TPS at 3.7v and still get the same performance as you do at 4.65v because it is ignored once the LV8 hits a certain level.  ON the other hand, your AC won't cut off and you cannot program the chip

[Steve Wood]

with regard to tuning, looking at the instructions, I would probably use positions 6 and 7 to lean the launch down

[good2win22]

with regard to tuning, looking at the instructions, I would probably use positions 6 and 7 to lean the launch down

I was pulling fuel from those two blocks at first but the AFR correction increased. Studying the log, and barely in the 6 block maybe two or three frames when staging. Block 7 for the rest of the launch. Then of course block 8 after launch. I then went to the VE table and started working the cells in and around the bubble at launch.  But guess what, AFR correction increased.




I was going to call Eric here I the next few days and ask his take on it