What ECU/Piggyback works?
10-31-10, 11:06 AM
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What ECU/Piggyback works?
Have any of the piggybacks out there been tested? several come to mind....AEM FIC, Emanage,haltech..Just wondering!
Last edited by 1990hondah; 10-31-10 at 11:45 AM.
10-31-10, 12:22 PM
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The FIC does seem to work where others fail. Even a few Acura TSX guys got theirs boosted with it. That ECU is a major pain. Hondata tried...put something together then gave up.
It looks like the FIC works for the IS-F....
https://www.clublexus.com/forums/is-...teresting.html
It looks like the FIC works for the IS-F....
https://www.clublexus.com/forums/is-...teresting.html
Last edited by 1990hondah; 10-31-10 at 01:08 PM.
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11-01-10, 11:29 AM
#8
You could use the MAP-ECU2. It will be able to read everything, but the biggest problem I see if the MAP-ECU2 is supposed to be able to do timing, but I think it might not be too happy about the "ignition confirmation" signal.
Just an FYI. And if anyone wants to try the MAP-ECU2, lemme know, and I'll try to get a deal for ya 8-).
Jeff
Just an FYI. And if anyone wants to try the MAP-ECU2, lemme know, and I'll try to get a deal for ya 8-).
Jeff
11-01-10, 01:38 PM
#10
I know that a MAP-ECU2 would talk to the factory computer. And I could prolly figure out how to make it work. AND it could be used to fire the 2nd set of injectors in parallel mode, and it _could_ do timing, but the stock ECU might not like it. And it certainly wouldn't like it under normal conditions. If there was someone in NC locally I could install one in there car, but I can't garuntee it would do everything you'd want.
Jeff
Jeff
11-03-10, 03:11 PM
#11
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I had a look at the CAMCOM installation guide. Per the diagram, it intercepts the A/F signal and VVT-i signal while monitoring the RPM's. But it does not show any ability to trim or compensate the A/F and/or O2 sensors. This means that the ECU will detune back to the factory A/F ratio over time.
So it is just like any of the other basic piggybacks on the market currently. It might be ok for tuning the VVT-i but doesn't appear to be a good solution for fuel adjustment. That is unless the guide isn't complete.
So it is just like any of the other basic piggybacks on the market currently. It might be ok for tuning the VVT-i but doesn't appear to be a good solution for fuel adjustment. That is unless the guide isn't complete.
11-03-10, 06:08 PM
#12
A standard SAFC works fine. Ive had one on the car for 3 years now. For the last 6 months Ive had a AEM wideband hooked up and have watched the A/F ratio's. I never reset the ECM and have not retuned the SAFC until I put the AEM in the car.
When I frist installed the SAFC I tuned on a dyno subtracting -6% fuel across the RPM band. When I installed the AEM wideband I noticed the A/F was 14.0 across the RPM band. ***This means over the period of 2.5 years the ECM never learned or remapped around the SAFC*** (My dyno tune was 13.6 A/F ratio 2.5 years ago) I then after a few weeks of "getto" SAFC datalogging decided 14.0 wasn't going to cut it. I reset the ECM and guess what. 14.0 A/F ratio after the reset.
Then I proceeded to retune the SAFC for more of a street tune. I'm now at 13.4 across the RPM band at WOT.
My fuel compensation looks like:
2000RPM -4%
2800RPM -5%
3200RPM -6%
3800RPM -7%
4200RPM -8%
4400RPM -8%
5000RPM -6%
5400RPM -4%
Then I hold -4% till redline. This is all at or above 75% throttle. No tune below WOT!
I'd say the timing stayed the same also. (This is only a guess) Pulling timing is another way to change A/F ratios and the Lexus ECM doesn't look like it performed any modifcations form my "getto" datalogging before and after the ECM reset.
TO the OP----I dont think this would be a good option for FI tuning. The SAFC is a good option for the addition of a intake, header and exhaust NA setup.
When I frist installed the SAFC I tuned on a dyno subtracting -6% fuel across the RPM band. When I installed the AEM wideband I noticed the A/F was 14.0 across the RPM band. ***This means over the period of 2.5 years the ECM never learned or remapped around the SAFC*** (My dyno tune was 13.6 A/F ratio 2.5 years ago) I then after a few weeks of "getto" SAFC datalogging decided 14.0 wasn't going to cut it. I reset the ECM and guess what. 14.0 A/F ratio after the reset.
Then I proceeded to retune the SAFC for more of a street tune. I'm now at 13.4 across the RPM band at WOT.
My fuel compensation looks like:
2000RPM -4%
2800RPM -5%
3200RPM -6%
3800RPM -7%
4200RPM -8%
4400RPM -8%
5000RPM -6%
5400RPM -4%
Then I hold -4% till redline. This is all at or above 75% throttle. No tune below WOT!
I'd say the timing stayed the same also. (This is only a guess) Pulling timing is another way to change A/F ratios and the Lexus ECM doesn't look like it performed any modifcations form my "getto" datalogging before and after the ECM reset.
TO the OP----I dont think this would be a good option for FI tuning. The SAFC is a good option for the addition of a intake, header and exhaust NA setup.
Last edited by HKS350; 11-03-10 at 06:25 PM.
11-03-10, 06:15 PM
#13
On another note:
The IS350 runs LEANNNNN as hell on the hwy under no load. Ive never seen a stock ECM tuned like the OEM unit in the IS350.
A/F ratio is 14.7 to 15.7 most of the time its 15.3 on a flat road. If you start up an incline or hill at 80 mph is when it will hold 14.7 and thats as rich as it gets.
The IS350 runs LEANNNNN as hell on the hwy under no load. Ive never seen a stock ECM tuned like the OEM unit in the IS350.
A/F ratio is 14.7 to 15.7 most of the time its 15.3 on a flat road. If you start up an incline or hill at 80 mph is when it will hold 14.7 and thats as rich as it gets.
11-03-10, 06:29 PM
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Thanks for the data. Sounds like your keeping the tune in open loop mode. Maybe that's the trick? I wonder if it would also work in the instances when someone wants to add more fuel? I.e. +%
11-03-10, 06:38 PM
#15
Haven't really tried it too much. I did have it +% just to see the SAFC work and had the A/F ratio as low as 10.0 on the AEM wideband (which is where the AEM stops reading) I did no datalogging nor did I perform any long runs with it this rich. Only a couple of pulls. I'd bet $$ the OEM ECM would try to lean out the SAFC if the A/F ratio stayed below 11.0 for very long.
I'd also like some info on what happens to the cam timing WOT under lean cond. How does the ECM adjust the cams VVTi when its running lean. Lobux have and techinfo on this?
I'd also like some info on what happens to the cam timing WOT under lean cond. How does the ECM adjust the cams VVTi when its running lean. Lobux have and techinfo on this?