DTC's came back

[Gorman]

Hi Guys; i've been datalogging and in the ecu memory were two DTC's. P0171 and P0174. Long term Lean, banks 1+2. I cancelled them but within 36 hours they returned. I don't think i have a vacuum leak. With SVT lite and headers, would this indicate the 17lb injectors are over 80% at high RPM ?. Any advice would be appreciated...I'm reading 160 grams per second air volume, read by MAF at about 6500 rpm..G.

[cpapashley]

Originally Posted by Gorman

Hi Guys; i've been datalogging and in the ecu memory were two DTC's. P0171 and P0174. Long term Lean, banks 1+2. I cancelled them but within 36 hours they returned. I don't think i have a vacuum leak. With SVT lite and headers, would this indicate the 17lb injectors are over 80% at high RPM ?. Any advice would be appreciated...I'm reading 160 grams per second air volume, read by MAF at about 6500 rpm..G.

So what is your air intake temperature at the moment??

I doubt it would be maxing out though at that, Just one thing did you reset the ecu since you have put on the SVT intake?

[Gorman]

Hi A. the intake temperature is ...well last night it was 1 to 5*c and during the day...9 to 15*c. I have an airbox fitted behind the fender ...so it scoops up alot of air. The faster i go, the lower intake temp is. SVT stuff has been on months and months, gonna reset everything again and see...Anyone specifically know if 160grams a sec. is over 80% duty on the injectors. I have the 19lb injectors ready and the down time over christmas..chitty chitty bang bang and mary poppins can wait 'til next year !! G. Oh! happy christmas A. Hope you and yours have a great time....in the blazing sunshine ..you lucky people.

[jaged]

is there any kind of chip or tune in the equation. ive been running svt lite and headers for years now, but i have a chip in there to even thing out

[Gorman]

Originally Posted by jaged

is there any kind of chip or tune in the equation. ive been running svt lite and headers for years now, but i have a chip in there to even thing out

Hi J. what power do you get from your setup ? i don't have it chipped or remapped. I was thinking of waiting 'til the cams go in to do that...i don't have a flash tool, just a logging interface tool ..otherwise i would have an intermediate mapping flashed on there. G.

[Gorman]

...well i reset the ECU and within 24 hrs the long term lean codes came back again. Please, can someone spell out the implications to me..oh and the best course of action..thanks G.

[cpapashley]

Originally Posted by Gorman

Hi A. the intake temperature is ...well last night it was 1 to 5*f and during the day...9 to 15*f. I have an airbox fitted behind the fender ...so it scoops up alot of air. The faster i go, the lower intake temp is. SVT stuff has been on months and months, gonna reset everything again and see...Anyone specifically know if 160grams a sec. is over 80% duty on the injectors. I have the 19lb injectors ready and the down time over christmas..chitty chitty bang bang and mary poppins can wait 'til next year !! G. Oh! happy christmas A. Hope you and yours have a great time....in the blazing sunshine ..you lucky people.

Hope you have a great christmas as well, always a special time of year reflecting on the birth of Christ.

Wish I new a little more on these calculations, I know Tom (aka warmonger) has some great worksheets that do these types of calculations. 160g/sec is probably in excess of 80% duty as well I would think, maybe up round the 90%. From memory it went something like 17lb injectors are around 17lb/hr of air which is around the 130g/sec. Might be wrong there as these calcs are a bit new to me. But I think I am learning.

Here is that link for Tom's great page with lots of excel spreadsheets to keep you busy until next christmas.

Tom

Sorry I cannot give you a definitive answer, it seems most of those on the forum have gone very quiet....

[Gorman]

..thanks for that A. 130g of air for 17lbers gives somewhere to start from. Maybe i should reload the program and choose imperial. Worth a try i suppose. G.

[cpapashley]

Originally Posted by Gorman

..thanks for that A. 130g of air for 17lbers gives somewhere to start from. Maybe i should reload the program and choose imperial. Worth a try i suppose. G.

I did find a great page for converting all that stuff.

Just in the middle of Christmas eve, with all the kids....

will check back after christmas...maybe I can find that link for you.

[cpapashley]

here tis.......


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