Wanted: UpRev Tuning DIY - Tuning 101?
04-14-2014, 01:20 PM
#342
Easy. Use the values the stock GTR ROM uses:
FWIW, I meant to use those values but I guess I ended up with running stock Z values when I tuned mine. It runs, starts (hot and cold) and idles just fine with stock values, but I think I'm going to retune it with the correct values.
I've never found what pressure they flow 570cc at either. If they're 570cc at standard injector pressure of 43psi, then they'd flow ~620cc at the 51psi the Z's fuel system operates at.
If anyone else tunes these, let me know if you happen to get a weird lean spot right around 2200rpm and 3-4ms BFS. It's really weird- it didn't exist with the stock injectors, and I wonder if there's some resonance in the fuel rails that drops pressure right at that frequency and duty cycle. It seems the STi guys get weird lean spots due to fuel system resonance, but I would have thought the dampers on the rails would counteract it. I dunno.
Last edited by kilogram; 04-18-2014 at 10:44 AM.
04-14-2014, 03:19 PM
#344
Hardest Setting
iTrader: (3)
Join Date: Feb 2008
Location: MexiCali dodging potholes
Posts: 13,406
Received 130 Likes
on
102 Posts
brought UpRev cable
have laptop
have babies
babies (daughter) broke laptop screen
Add monitor to laptop
babies (daughter) break that monitor as well...
Carry on...
I'll be tuning soon....
have laptop
have babies
babies (daughter) broke laptop screen
Add monitor to laptop
babies (daughter) break that monitor as well...
Carry on...
I'll be tuning soon....
04-15-2014, 01:12 PM
#348
I have an acer aspire V5 571 something or other. I like the touch screen vs. trying to use the touch pad or mouse it. It's just a lot faster when I'm tuning part throttle stuff while my wife is driving. Pretty much any laptop will do though, as you'll get used to whatever you get. The thing with the touch screen is that if you don't like it, you don't have to use it. My only complaint is that I can't turn it off, and my 2 year-old knows how touch screens work 
.
A number pad is a big plus too. It's much easier to use the +/- keys there than fumble with shift while tuning on the fly. I can just touch where the tracer is on the screen with my left hand and hit + or - to make changes. Super easy.
.A number pad is a big plus too. It's much easier to use the +/- keys there than fumble with shift while tuning on the fly. I can just touch where the tracer is on the screen with my left hand and hit + or - to make changes. Super easy.
Last edited by kilogram; 04-15-2014 at 01:14 PM.
04-17-2014, 03:19 PM
#349
I have an acer aspire V5 571 something or other. I like the touch screen vs. trying to use the touch pad or mouse it. It's just a lot faster when I'm tuning part throttle stuff while my wife is driving. Pretty much any laptop will do though, as you'll get used to whatever you get. The thing with the touch screen is that if you don't like it, you don't have to use it. My only complaint is that I can't turn it off, and my 2 year-old knows how touch screens work .
A number pad is a big plus too. It's much easier to use the +/- keys there than fumble with shift while tuning on the fly. I can just touch where the tracer is on the screen with my left hand and hit + or - to make changes. Super easy.
.A number pad is a big plus too. It's much easier to use the +/- keys there than fumble with shift while tuning on the fly. I can just touch where the tracer is on the screen with my left hand and hit + or - to make changes. Super easy.
04-25-2014, 06:52 AM
#352
MAF volts
AFR correction for both banks
Log ignition timing as well. If you change injectors, it screws up the BFS axis of the timing table and advances the timing quite a bit. You'll need the stock logs to be able to adjust the timing tables back to stock. Do a lot of normal driving, but try to also do a couple slow pulls at part throttle up to redline to fill in as much of the table as possible using djamps tool (cipher is surprisingly worthless for viewing logs, despite how pretty it is).
The more info you have on how the car ran in stock configuration, the easier it is to replicate that once you've made changes.
04-25-2014, 10:33 AM
#353
BFS
MAF volts
AFR correction for both banks
Log ignition timing as well. If you change injectors, it screws up the BFS axis of the timing table and advances the timing quite a bit. You'll need the stock logs to be able to adjust the timing tables back to stock. Do a lot of normal driving, but try to also do a couple slow pulls at part throttle up to redline to fill in as much of the table as possible using djamps tool (cipher is surprisingly worthless for viewing logs, despite how pretty it is).
The more info you have on how the car ran in stock configuration, the easier it is to replicate that once you've made changes.
MAF volts
AFR correction for both banks
Log ignition timing as well. If you change injectors, it screws up the BFS axis of the timing table and advances the timing quite a bit. You'll need the stock logs to be able to adjust the timing tables back to stock. Do a lot of normal driving, but try to also do a couple slow pulls at part throttle up to redline to fill in as much of the table as possible using djamps tool (cipher is surprisingly worthless for viewing logs, despite how pretty it is).
The more info you have on how the car ran in stock configuration, the easier it is to replicate that once you've made changes.
04-26-2014, 01:08 PM
#354
Thanks for the info. I did various driving styles. Cruising to WOT, WOT to cruising, etc. Anyways, I reviews my data log and was @ 10.18 on my AFR around 6krpm's and was consistent 10's in the rest of the rpm range. Could only get up to 6500 due to traffic. I did notice that my AFR correction was 103 then fluctuates to 100 when letting off the throttle.
Granted, I never logged the original ROM, I only started logging once I flashed the ECU with the "stock" uprev ROM.
The correction will go to 100 whenever it exits closed loop. That includes decel fuel cutoff when you close the throttle.
05-05-2014, 08:18 PM
#356
Registered User
Join Date: Sep 2011
Location: Philadelphia, PA
Posts: 831
Likes: 0
Received 0 Likes
on
0 Posts
FYI GTR injectors are 550cc (I thought they were 570). There was a thread where someone tested HR, GTR, and a couple other injectors:
http://forums.maxima.org/all-motor/6...ml#post8948162
http://forums.maxima.org/all-motor/6...ml#post8948162
05-06-2014, 11:46 AM
#357
FYI GTR injectors are 550cc (I thought they were 570). There was a thread where someone tested HR, GTR, and a couple other injectors:
http://forums.maxima.org/all-motor/6...ml#post8948162
http://forums.maxima.org/all-motor/6...ml#post8948162
Last edited by kilogram; 05-06-2014 at 11:48 AM.
05-15-2014, 01:44 AM
#359
Can anyone explain how ECU exactly determinates Base Fuel Schedule, what conditions it takes into account? Having that strange issue for a long time and I would really want to know whats going on.
Problem is that sometimes when I make WOT run, for instance in 2nd gear, from 2000 rpm up to the red line, ECU "hits" no more than 17-18 BFSC, and sometimes it goes over 30 BFSC. Same boost levels, same ambient conditions, water temp. etc., but obviously it looks up to the other part of the ignition and fuel compensation table which results in different performance of the car. Which pisses me off
.
2nd problem isn't potentially big but might be related to the 1st one. According to the logs, gear detection is totally wrong, looks like it puts random values.
Problem is that sometimes when I make WOT run, for instance in 2nd gear, from 2000 rpm up to the red line, ECU "hits" no more than 17-18 BFSC, and sometimes it goes over 30 BFSC. Same boost levels, same ambient conditions, water temp. etc., but obviously it looks up to the other part of the ignition and fuel compensation table which results in different performance of the car. Which pisses me off
.2nd problem isn't potentially big but might be related to the 1st one. According to the logs, gear detection is totally wrong, looks like it puts random values.
