Hey guys,
Hoping some people can chime in with some ideas on what I am seeing on my data logs. First a little bit of background:
- Greddy Turbo kit
- HKS SSQV BOV (VTA)
- Rx8 Performance CAI
- GReddy Profec Bspec II EBC
- Stock Fuel Injectors
- Deatschwerks DW200 Fuel Pump
I recently installed my new Rx8 Performance intake and GReddy EBC. After installing these I got a complete re-tune done by that beauty Mr. BRETTSPEED. Everything is running excellent with the new mods apart from one thing; this was noticed during some logging while attempting to home in my EBC settings.
From a coast when I press down my accelerator to WOT and my turbo spools up I am seeing loads and MAF increase as expected, but my AFR's do not start decreasing to a safe rich value until about 1+ seconds after the throttle has been depressed to 99%. In some cases I am seeing loads of over 100% while still seeing AFR's in the 20's!
My first initial thought was that this must be a tuning issue, but chatting with Brett and having him review multiple datalogs using multiple tunes (dug out an old MM tune I had from back in 2011 and did a datalog to find the same issue occurring) I think we have reasonable information to eliminate this as a tuning issue.
My next thought is that maybe my injectors are sticking causing this delay in fuel delivery. To add to this as a note; currently on my fuel pressure gauge at idle I see about 56psi (seems low to me but I've seen this same pressure using 3 different fuel pumps) and when I go WOT I see it drop to a worst case low of about 52psi. Could be related to this but I don't believe it would be because once my AFR's drop they hold right to redline.
Any thoughts out there as to what could be causing this 1 second delay in fuel delivery? I have attached a 3rd gear datalog showing this delay as well. This log was taken with my EBC off and running a max 6psi of boost off the stock Greddy actuator.
Hoping some people can chime in with some ideas on what I am seeing on my data logs. First a little bit of background:
- Greddy Turbo kit
- HKS SSQV BOV (VTA)
- Rx8 Performance CAI
- GReddy Profec Bspec II EBC
- Stock Fuel Injectors
- Deatschwerks DW200 Fuel Pump
I recently installed my new Rx8 Performance intake and GReddy EBC. After installing these I got a complete re-tune done by that beauty Mr. BRETTSPEED. Everything is running excellent with the new mods apart from one thing; this was noticed during some logging while attempting to home in my EBC settings.
From a coast when I press down my accelerator to WOT and my turbo spools up I am seeing loads and MAF increase as expected, but my AFR's do not start decreasing to a safe rich value until about 1+ seconds after the throttle has been depressed to 99%. In some cases I am seeing loads of over 100% while still seeing AFR's in the 20's!
My first initial thought was that this must be a tuning issue, but chatting with Brett and having him review multiple datalogs using multiple tunes (dug out an old MM tune I had from back in 2011 and did a datalog to find the same issue occurring) I think we have reasonable information to eliminate this as a tuning issue.
My next thought is that maybe my injectors are sticking causing this delay in fuel delivery. To add to this as a note; currently on my fuel pressure gauge at idle I see about 56psi (seems low to me but I've seen this same pressure using 3 different fuel pumps) and when I go WOT I see it drop to a worst case low of about 52psi. Could be related to this but I don't believe it would be because once my AFR's drop they hold right to redline.
Any thoughts out there as to what could be causing this 1 second delay in fuel delivery? I have attached a 3rd gear datalog showing this delay as well. This log was taken with my EBC off and running a max 6psi of boost off the stock Greddy actuator.
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