IFR Table Query
Hi All
Modified car now running higher boost and new bigger injectors (60lb) I have been comparing stock to modified tunes that was done by shop and trying to understand some points, I cant understand why my new IFR table is flat to 400 Kpa then curves where original was a curve from start, have enclosed pic of both any help to understand this would be great.
I was under impression that if using bigger injectors they should still have curved operating profile?
400kPa is the pressure difference across each innector at WOT, while 480 kPa is the pressure difference at maximum vacuum; if you had 1-bar boost then pressure difference is 300 kPa; so if you do not run with boost then IFR axis below 400 kPa is never used.
Yep lost me there!! (Confused)Originally Posted by joecar
I'm running 13.5 - 14psi max boost
What I think you saying is basically up to 400kpa not used in table.
I spend a lot of time not in boost as cruising on part /small throttle openings max 60 kpa on gauge in EDI unit.(my PE set for 95kpa)
Was thinking if IFR was curved then I would be using less fuel at lower end of table
Below 400kPa is for boost.
14.7 psi is 1-bar (100 kPa)
400 kPa is rail pressure, subtract boost from this.
Question: is your FPR manifold referenced or is it un-referenced...?
If IFR does not correctly model your injectors then fueling will be incorrect, and trims will have to correct it in CL, and in OL there is no trimming/correction.
If FPR is un-referenced then IFR is sloped (with sqaureroot pressure).
If FPR is manifold referenced then IFR is flat.
Yep that's where confused, factory tune was sloped. Car supercharged as standard (basically a four door ZL1 as stock tunes identical for both e67 LSA, T43 A6 6l90e)
Now more boost and more injector I don't believe should be seeing massive differences apart from air flows and fueling??
PM me please
Does your FPR have a boost/vacuum refence hose...?
Dunno believe fpr in tank with pump aka Zl1/Ctsv, stock tunes on these for LSA are identical in repository.
Tune is referenced gs/sec so I assume pump pressure controlled by ECM dependant on Readings from MAF selecting either 350,415,450kpa fuel pressure.
I'm locating a ZL1/CTSV tune to look at more closely... if vehicle is fitted with FPDM module then FPR still regulates rail pressure. If FPR is in tank then it is unreferenced.
2012 Cadillac CTS-V Sedan Automatic LSA 6.2 Litre (12653238).ctz
2013 ZL1 Stock ECM.ctz
Believe FPDM module no expert though!!
Couple of stock tunes
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