SVO 30#s tuning
12-10-2007, 06:57 PM
#1
SVO 30#s tuning I just got dyno tuned and was running at 113% duty cycle on my stock 2000 (26lb) injectors so I bought some 30lb SVO's from Speed Inc. I plan to just run a script from Chad at GLMS to tune for the new SVO's. The script is attached.
Should I have to touch the VE table after I do this?
Thanks!
Should I have to touch the VE table after I do this?
Thanks!
12-13-2007, 02:21 PM
#6
That IFR table is 15% too high. The IFR table should start at 30 on the left. If your AFR & LTFT's were correct with the stock injectors, you will now have very high LTFT's. I never had to change the offset table with an injector change. Changing the offset table higher is just compensating for the IFR being too high.
Russ Kemp
Russ Kemp
12-13-2007, 03:13 PM
#7
That IFR table is 15% too high. The IFR table should start at 30 on the left. If your AFR & LTFT's were correct with the stock injectors, you will now have very high LTFT's. I never had to change the offset table with an injector change. Changing the offset table higher is just compensating for the IFR being too high.
Russ Kemp
Russ Kemp
Most of the OEM (offset) tables seem to really over compensate for voltage drops, which I suppose is better than going the other way. Also (obviously not talking about this setup, but in general) I redo the table for boost referenced setups ie, copying the 0kPa column across like the IFR... as it does change, but that's me OP, I'm not holding back on you, I just don't have what you are looking for/need. G'luck.
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12-14-2007, 02:59 AM
#8
That IFR table is 15% too high. The IFR table should start at 30 on the left. If your AFR & LTFT's were correct with the stock injectors, you will now have very high LTFT's. I never had to change the offset table with an injector change. Changing the offset table higher is just compensating for the IFR being too high.
Russ Kemp
Russ Kemp
12-16-2007, 07:18 PM
#10
Setting the IFR table as per the spread sheet causes lean AFR's & postive fuel trims. You would then have to raise the VE/Maf tables to compensate. Setting the IFR table to be 30 starting on the left, the AFR's & fuel trims fall back in line.
Russ Kemp
12-17-2007, 11:46 PM
#11
Just to let everyone know...I copied over B4005, B4004, and B4003 from a stock 2002 tune and changed my B4001 (IFR table) to what's in the script above and it seems to work fine. My air to fuel ratios look good.
The only thing that's wierd is that I'm at 91% duty cycle with the new SV0 30# injectors. I thought I'd have more room to grow with them. I guess not?
The only thing that's wierd is that I'm at 91% duty cycle with the new SV0 30# injectors. I thought I'd have more room to grow with them. I guess not?
12-18-2007, 02:52 PM
#12
Just to let everyone know...I copied over B4005, B4004, and B4003 from a stock 2002 tune and changed my B4001 (IFR table) to what's in the script above and it seems to work fine. My air to fuel ratios look good.
The only thing that's wierd is that I'm at 91% duty cycle with the new SV0 30# injectors. I thought I'd have more room to grow with them. I guess not?
The only thing that's wierd is that I'm at 91% duty cycle with the new SV0 30# injectors. I thought I'd have more room to grow with them. I guess not?
12-19-2007, 10:06 AM
#14
I see. Still, I wonder if maybe the injectors need to be flushed/cleaned? Is there anything in the tune that will allow more fuel at a lower duty cycle?? Pulse width maybe?? I just can't imagine a heads and 230's cam 346 needs that much fuel......
12-20-2007, 12:10 PM
#17
AFR will also affect your duty cycle, leaner AFRs will reduce the DC, while richer AFRs will increase the DC. So if you are at 91% DC, but are at 12.5, then that is more understandable.
