My tuning issues - ZR-1 Net Registry Forums

XfireZ51 · 05-18-2008

Just like =Jeff=, I decided to do a scan on my motor the other day trying to tweak and optimize tthe tune now that I'm back from BG. Prior to going, BLMs were in the 124-132 range depending. Idle was fine.
But with the latest scans, idle BLM is sitting at 115 both sides and INT is at 100. ECM is adding fuel although I have taken fuel out of the VE tables.
Motor transitions smoothly from Open to Closed loop. Idles at 725-750rpm.
And it doesn't smell rich once warmed up. Idle injector PW seems a bit high at 4ms. As I said in a previous post, Left side 02 appears a bit lazier than right but they track pretty closely to each other. No codes although I did have a VAL 66 which is a shorted or shunted VALET switch code. However as of last scan, that did not appear.
I'm thinking some kind of exhaust leak particulalrly given that the low BLMs are in the lower MAP region where vacuum is high and would suck in fresh air. That would explain why motor runs better than scan would indicate. Whatever it is appears to affect both sides equally and I am not sure where an exhaust leak could happen which would affect both sides.

XfireZ51 · 05-19-2008

Something else I noticed today is that it did take a while for the motor to go into Closed Loop. Coolant Temp got high enough for fans to come on but still no C/L. Once in C/L, BLM and INT started to fall.

bradslt5 · 05-19-2008

could thatr mean the main computor is starting to go away .here one for ya . was cruizing along at 85 when allof a sudden the speedo went to 59 and the ave fuel went fro 25.1 to 20.0 this lasted fro about 3 min it,magiclychange to what it was reading before

XfireZ51 · 05-19-2008

Quote:

Originally Posted by bradslt5

could thatr mean the main computor is starting to go away .here one for ya . was cruizing along at 85 when allof a sudden the speedo went to 59 and the ave fuel went fro 25.1 to 20.0 this lasted fro about 3 min it,magiclychange to what it was reading before

Brad,

I don't think that's it. Its been pretty consistent with the last several scans. Right now I'm investigating a leak at the header collector. The motor doesn't surge, its idling nicely, so that tells me whatever is causing the ECM to see a lean condition is coming after the intake side. Its not turning on/off like a light switch.

XfireZ51 · 05-19-2008

Got it. Bad bin file. I'll need to retrace my steps and see where it went wrong. I was able to pick a bin I knew had worked and downloaded to the Ostrich. Bingo! BLMs and INT in line. Now I'll transfer my other changes to this bin and move on. Time to scan again.

LGAFF · 05-19-2008

Great to hear, do you think was effecting your BG runs?

LGAFF
92 ZR1
#234

05-18-2008	#1
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	My tuning issues Just like =Jeff=, I decided to do a scan on my motor the other day trying to tweak and optimize tthe tune now that I'm back from BG. Prior to going, BLMs were in the 124-132 range depending. Idle was fine. But with the latest scans, idle BLM is sitting at 115 both sides and INT is at 100. ECM is adding fuel although I have taken fuel out of the VE tables. Motor transitions smoothly from Open to Closed loop. Idles at 725-750rpm. And it doesn't smell rich once warmed up. Idle injector PW seems a bit high at 4ms. As I said in a previous post, Left side 02 appears a bit lazier than right but they track pretty closely to each other. No codes although I did have a VAL 66 which is a shorted or shunted VALET switch code. However as of last scan, that did not appear. I'm thinking some kind of exhaust leak particulalrly given that the low BLMs are in the lower MAP region where vacuum is high and would suck in fresh air. That would explain why motor runs better than scan would indicate. Whatever it is appears to affect both sides equally and I am not sure where an exhaust leak could happen which would affect both sides.

05-19-2008	#3
bradslt5 Join Date: Oct 2007 Location: lone pine and mammoth lakes ca. Posts: 544	Re: My tuning issues could thatr mean the main computor is starting to go away .here one for ya . was cruizing along at 85 when allof a sudden the speedo went to 59 and the ave fuel went fro 25.1 to 20.0 this lasted fro about 3 min it,magiclychange to what it was reading before

05-19-2008	#5
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: My tuning issues Got it. Bad bin file. I'll need to retrace my steps and see where it went wrong. I was able to pick a bin I knew had worked and downloaded to the Ostrich. Bingo! BLMs and INT in line. Now I'll transfer my other changes to this bin and move on. Time to scan again.

05-19-2008	#6
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: My tuning issues Great to hear, do you think was effecting your BG runs? LGAFF 92 ZR1 #234

05-19-2008	#2
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: My tuning issues Something else I noticed today is that it did take a while for the motor to go into Closed Loop. Coolant Temp got high enough for fans to come on but still no C/L. Once in C/L, BLM and INT started to fall.