Lean spike at 5k-5500?
What should I check to be the issue? No matter what I add for fuel there it wont go away, could it be a faulty wideband? I'm not getting a misfire there either.
Mods: BBK-B FIC 1450's on e85 DIY Coil on Plug Single walbro-unmodded Kelford 272's ETS 4" FMIC Injen LICP Crushed IX BOV 3 inch TBE LC1 wideband for AFR's Here's a screen shot: https://farm7.static.flickr.com/6188...66f62ca7_b.jpg |
If it's a single pump system still it could be overrunning the pump. 330 load seems a little low to be running out of fuel, but It's possible. what's the IDC at?
|
I'm having a similar issue with my setup on pump gas so I'm curious to see if you get this resolved. However, I have been able to correct it for the most part by adjusting my fuel map in that area. The only problem is that my fuel map looks like someone dug a hole in the middle of it and it doesn't look very pretty, which makes me think that it could still be a mechanical issue.
|
Injector Duty was at 84% I think?
|
At that RPM range for that turbo the pressure on the turbine is still quite low, yet 30 psi is behind the compressor. During valve overlap the fuel mix just goes out the tailpipe and the WB reports it like a lean miss. Adding fuel will just make it worse. Once back pressure builds up it dissappears. On small stock turbo's the opposite happens because backpressure is so great causing internal EGR.
|
Originally Posted by C6C6CH3vo
(Post 9608022)
At that RPM range for that turbo the pressure on the turbine is still quite low, yet 30 psi is behind the compressor. During valve overlap the fuel mix just goes out the tailpipe and the WB reports it like a lean miss. Adding fuel will just make it worse. Once back pressure builds up it dissappears. On small stock turbo's the opposite happens because backpressure is so great causing internal EGR.
Is there anyway I can test this or fix it |
Have you had the fuel pump on there for long??
If it does the same at 20 psi, its not the pump. If you think the map is correctly tuned, then I would run down the checklist of possible fuel system issues, ie: dirty inj, nasty filter, pump life etc etc... |
1 Attachment(s)
I actually just had this happen for the first time too. Its 'tunable' but very uncommon. Zero boost leaks up to 40psi, DW300 fuel pump with MSD boost-a-pump and fuel pressure is solid (checked with gauge). ID1000 injectors at a max of 95%IDC (resistor pack bypassed), running 96530706 rom. The only thing we haven't tried are new injectors thus far.
https://www.evolutionm.net/forums/at...1&d=1316195364 |
Originally Posted by Jack_of_Trades
(Post 9608449)
I actually just had this happen for the first time too. Its 'tunable' but very uncommon. Zero boost leaks up to 40psi, DW300 fuel pump with MSD boost-a-pump and fuel pressure is solid (checked with gauge). ID1000 injectors at a max of 95%IDC (resistor pack bypassed), running 96530706 rom. The only thing we haven't tried are new injectors thus far.
https://www.evolutionm.net/forums/at...1&d=1316195364 |
On of the local shops tuners down here just had this problem on his car today too, he switched to e98 did a pull, it was flat, did another pull and it was present from then on out in the following pulls. His starts a little earlier and lasts a little longer though.
|
Anybody have an idea? I logged voltage and it only drops to 13.7 so not enough that the fuel pump cant pump fast enough
|
Originally Posted by b16a95eg
(Post 9610547)
Anybody have an idea? I logged voltage and it only drops to 13.7 so not enough that the fuel pump cant pump fast enough
At 12.5v and 30psi of boost, the wally only flows about 189LPH. |
Originally Posted by Dynotech Tuning
(Post 9611155)
Unless you did a fuel pump rewire, you aren't getting that much voltage on the stock wiring harness at the pump. On average I see closer to 12.2v back there.
At 12.5v and 30psi of boost, the wally only flows about 189LPH. Minnesota already switched to e70, so i'm going to do another log tomorrow and see if its still there. If so i'll try the rewire |
Originally Posted by b16a95eg
(Post 9608368)
It didnt do it when it was first tuned though?
|
Originally Posted by C6C6CH3vo
(Post 9611679)
In that case it probably isnt the reason then, unless cams settings have been changed. I have a different turbo but I get a brief lean spike right before peak boost that is definately not related to the actual ratio of fuel to air. It goes 13:1 but is brief and not worth worrying about.
|
All times are GMT -7. The time now is 12:55 PM. |
© 2024 MH Sub I, LLC dba Internet Brands