Ok guys we need a bit of help.
When scanning the car what do we look for as far as seeing if the injectors are maxed out or are getting close? (what parameter) searched around a bit but found mostly info on skewing. Any help is appreciated.
It's a 2000 GTP
SSIC/ 1.9RR/ 3" CATLESS DP/ 3" FULL EXHAUST/ FWI/ 180*/ AL-104/ 3.25 3.0 MPS/
Last edited by CSC04; 05-27-2008 at 11:21 AM.
Engine
2004 GTP, 1.9 Rockers, 3" Catless DP, 3.5 MPS, 180* t-stat, AL104's, FWI, HPT (pro) . LS1M scanner.
Log RPM and injector pulsewidth. Then you can use the built in custom PID for injector duty cycle.
Bill Winters
Former owner/builder/tuner of the FarmVette
Out of the LSx tuning game
ok I'll see if I cant post up a log after lunch.
Engine
2004 GTP, 1.9 Rockers, 3" Catless DP, 3.5 MPS, 180* t-stat, AL104's, FWI, HPT (pro) . LS1M scanner.
IPWs in the 23ms range can be considered close to maxing out on the 97-03 models. 04+ it is higher because they are a returnless system. I think for them, it is in the 27-28ms range... not positive about this.
'99 Black GTP Sedan
3.4-2.6" PB Quick Change pulleys, Custom CAI, XP Cam, N* TB, LQ4 MAF, SLP headers, 42.5# Injectors, 180/195* thermostat.
13.501 @ 103.392 on 91 (2.4 60-foot).
13.82 @ 105.28 on 87 octane! (2.42 60-foot).
263kph top end as shown on the GPS.
All this and 39MPG to boot. What more can a man ask for?
* Just another enthusiastic amateur tuner! *
Thanks for the replies guys,
It's my brothers car and we see IPW's around 18-20 range @ WOT, with the stock injectors. He currently has 42 pounders but has yet to install them. Let me see if I can find a quick scan.. Thanks much.
PS I know the tune needs a bit of work in general.
Shane
Last edited by CSC04; 05-27-2008 at 04:49 PM.
Engine
2004 GTP, 1.9 Rockers, 3" Catless DP, 3.5 MPS, 180* t-stat, AL104's, FWI, HPT (pro) . LS1M scanner.
04+ are a mystery. For some reason the PCM doesn't report the correct IPW (this was verified with measuring the signal with an oscilloscope). For the most part the IPW/Duty Cycle numbers for 04+ are generally worthless--my scans show I am at 100%+ duty cycle with 60# which isn't true, I have plenty of fuel....verfied by making the AFR terribly rich 9.x and it can get more fuel.04+ it is higher because they are a returnless system. I think for them, it is in the 27-28ms range... not positive about this.
2017 Chevrolet SS, Orange Blast Metallic, Rotofab CAI. Headers coming soon. Stock Tune for now
Previous Rides: 2008 G8 GT, 2004 GTO, 2004 GTP, 2002 TA
Originally Posted by 5_Liter_Eater
So when you use the pid for injector duty cycle....if it is showing 80%...then 80% of the injector is being used correct?....what is stock duty cycle considered in this format?
Essentially, yes. It means that the injector is open for 80% of the crank rotation. Anyhing at or under 80% is good, above 80% is debatable, above 100% is time for bigger injectors.
Bill Winters
Former owner/builder/tuner of the FarmVette
Out of the LSx tuning game
99 3800 PCM why can I not scan for injector pulse width? What am I missing/doing wrong?
Thank you
Capture.JPG
1999 Riviera L67 SII 3800
XP HOT cam, 140# springs, Gen V swapped, 60# inj, E85
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