Well last night I went to PSI Motorsports, New Tripoli, PA. We did atleast 5 halfass pulls; because my afr would read 14.5 - 14.7 no matter how we adjust fuel pressure. I have a 2000'F pyrometer in the car and installed it when the car was n/a. The reason for that was to get some base readings to tune off of. When I ran the car n/a at the track I would cross the line @ 1600'F. Now with the turbo on my last pull of the night I went till the pyro hit 1400'F. It topped out at 1400 right when it hit the speed limiter of 105mph.
I'm alittle confused. My afrs dropped to 13.6 at about 4800rpm but my fuel pressure also dropped to about 70psi at that same moment.
All in all, I'm happy with the power it made
223h.p. @ 5600rpm / 222ft/lbs @ 4700rpm (in 4th gear)
Man, i thought this was common knowledge by now.....
You have one of the ecu's with the retarded power enrichment settings. Basically, your car doesn't leave closed loop operation until almost redline, and your ecu will continue to pull injector pulsewidth to get the 14.7:1 AFR it wants to see in closed loop until then. Basically, you can either use a 2002 ecu or have it reflashed to an 02 program, or have someone with HPT change where the closed/open loop switchover point is. You're not the only one who's seen this issue, and I'm pretty sure more than one Eco has blown because of it. Do your best not to get the car into boost until you get the ecu situation taken care of. DaFlyinSkwirl's ecu wouldn't enter power enrichment until something like 5500 rpm at over 80% throttle, until he reflashed it with HPT. Same with Encriptor's turbo 04 cav that we first encountered the issue on. HPT wasn't available then, so he went to megasquirt for fuel control and cut the stock ecu out of the picture entirely. There is one other way to get the car into open loop without reflashing, but it involves doing a mod which is illegal and will ruin what little resale value your car may have, so i don't recommend it. I remember one other person who had this issue and they contacted Hahn directly and received assistance. So first, give Hahn a call and see what they can do for you, if that fails find somebody local with HPT who knows how to use it or purchase it yourself. OR you can find a 02 ecu from the junkyard, install it, do a passlock relearn, and it should be good to go. The "Idiot Map" as I call it, didn't seem to come into play until mid 2003-ish....
Arrival Blue 04 LS Sport
Eco
Turbo
Megasquirt
'Nuff said
I contacted Hahn tech right after I posted this. He told me that exact same thing, he said go with a '03 5spd ecu reflash. He said there is a vin included with the portfueler. I think I'll try that first.
Hahn should be telling people this when they buy their kits from them, if they don't already.
- 93 mph in the 1/8 mile
Member of J-Body Of Michigan.
Nice numbers, but yeah that's scary lean. I would be careful until you get that fixed.
" To study and not think is a waste. To think and not study is dangerous. "
Hey scarab, you wouldn't be talking about the vss switch would you?
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4 Cams...32 Valves...5 Liters...This Could Get Fun!
I made the findings on the VSS switch and the 03.5+ ECU issues public long ago. Find that post and you'll get lots of good info and some solutions.
I used to race cars, now I race myself.
5K PB: 24:50
10K PB: 54:26
Skilz10179 wrote:Hahn should be telling people this when they buy their kits from them, if they don't already.
actully it says it in big letters when i bought my portfueler. need to buy an 03 ecu or have your ecu flashed to XX vin number
http://www.myspace.com/15102113
12.5@116 2.0 60ft 19psi
JOhn- Does the ECu I bought off of you do this^^^. Or since it reflashed to the S/C does that solve the problem? I know you ahd no issues when you were running it, you just wanted more power/ with a better tune correct?
At this point my idea is to get a 2nd ecu and reflash that to an '03 vin #. I'm going to keep my '05 ecu for when I need inspection and emmissions testing. Then I'll switch them. At this point, my cel light has not come on since I've done the "cheap O2 sim" 18mm spark plug fowler trick. This will allow me to pass emmissions testing since the machines use the serial data port to read the ecu for at least 5 passed emmision flags.
Scorpio1 (blu03lambocavi) wrote:JOhn- Does the ECu I bought off of you do this^^^. Or since it reflashed to the S/C does that solve the problem? I know you ahd no issues when you were running it, you just wanted more power/ with a better tune correct?
If its the s/c flash, then no, it shouldn't have the same issue. Since the s/c flash is FOR BOOST, obviously it wouldn't search for an unsafe mixture.
Arrival Blue 04 LS Sport
Eco
Turbo
Megasquirt
'Nuff said
slvr05cav wrote:At this point my idea is to get a 2nd ecu and reflash that to an '03 vin #. I'm going to keep my '05 ecu for when I need inspection and emmissions testing. Then I'll switch them. At this point, my cel light has not come on since I've done the "cheap O2 sim" 18mm spark plug fowler trick. This will allow me to pass emmissions testing since the machines use the serial data port to read the ecu for at least 5 passed emmision flags.
You don't have the portfueler correct? If not, why not consider HPT and you can change the PE RPM so the ECU will not fight you so much and also some other tuning (timing etc...)
FU Tuning
The shop I go to uses SCT....but...one of the other guys who works there is getting HP Tuners. I'm going to let them play around alittle with it on other cars first. For now I was going to try the '03 reflash.
I found a vin# but it has no ABS. Does this matter?
Scarab (Jersey Jay 1.8T) wrote:Scorpio1 (blu03lambocavi) wrote:JOhn- Does the ECu I bought off of you do this^^^. Or since it reflashed to the S/C does that solve the problem? I know you ahd no issues when you were running it, you just wanted more power/ with a better tune correct?
If its the s/c flash, then no, it shouldn't have the same issue. Since the s/c flash is FOR BOOST, obviously it wouldn't search for an unsafe mixture.
Your right, and I knew the answer before I posted, had a brain fart..... late hours at work+tired brwosing = random dumb questions.
Thanks Ryne.
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4 Cams...32 Valves...5 Liters...This Could Get Fun!
Blue 04 TRD (XLS2K4) wrote:Thanks Ryne.
Eh? Did I miss something?
I used to race cars, now I race myself.
5K PB: 24:50
10K PB: 54:26
You told me where to go for answers and I found them. So I said thank you, is that a problem?
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4 Cams...32 Valves...5 Liters...This Could Get Fun!
I have a 2005 Cavalier and a couple weeks ago I finished putting on stage 1 hahn kit with 20g upgrade. I had the same exact problem of AFR under boost. I hooked up a scan tool and recorded data under all rpm ranges. It stayed at 14.6 afr even at full boost. I agree it's dangerously lean. I called up Hahn and talked to a tech and he gave me a vin # to reflash it. Luckily, I work at a Chevy dealership and I reflashed the computer in 10 minutes. Now under boost the AFR changes to 12-12.3.
I have yet to get the car dynoed, I'll probably do it at NOPI in June.
Craig Rainbolt wrote:I have a 2005 Cavalier and a couple weeks ago I finished putting on stage 1 hahn kit with 20g upgrade. I had the same exact problem of AFR under boost. I hooked up a scan tool and recorded data under all rpm ranges. It stayed at 14.6 afr even at full boost. I agree it's dangerously lean. I called up Hahn and talked to a tech and he gave me a vin # to reflash it. Luckily, I work at a Chevy dealership and I reflashed the computer in 10 minutes. Now under boost the AFR changes to 12-12.3.
I have yet to get the car dynoed, I'll probably do it at NOPI in June.
I also work at a dealership. I found an '03 vin# , same rpo codes except radio. Is the vin you used an early '03?
I don't think it will matter though.
Thanks for looking out!!!! This will be done tomarrow.
yea I have a 04 so I need to do the same thing. How much does the reflash cost at the dealer?
Quote:
yea I have a 04 so I need to do the same thing. How much does the reflash cost at the dealer?
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4 Cams...32 Valves...5 Liters...This Could Get Fun!
Yes it was a early 2003 from what I remember. If you want the vin # i got pm me.
It only took me like 10 minutes seriously to reflash it. I hooked up the GM Tech 2 scan tool to the computer, downloaded the computer software from GM servers, deleted the old data off of the car and put the 03 software in it. I thought I was going to have trouble with my radio but haven't, and I have been driving it on the new vin for about a month now. If the techs are real cool about it they shouldn't charge you much, but it is a kind of a shady deal. Offer like a 6 pack or something and be cool about it.
Just curious slvr05cav, what turbo are you using to get those numbers?
Decent numbers...
2004 Turbo cavalier 11PSI and blown!
Black Fear wrote:Just curious slvr05cav, what turbo are you using to get those numbers?
He has the standard 16g from Hahn RaceCraft
