JeffTsai

iTrader: (1)

I've tried them all, and I settled on the eManage ultimate. It's more expensive, at around 2x the cost of a FIC. The FIC is pretty good, but the ultimate is a bit better in terms of smoothness. Most people that get me to install and tune usually go with the FIC since it's cheaper and meets their goals and requirements. For me, I demand perfection from my cars lol.

The Ultimate and FIC8 both can drive a V8 engine. How much boost are you planning on running?

ROPADOPA

Care to share on how you are reading the short and long term fuel trims on a 2jzgte vvti.

98sleeper

Jeff, When I grow up i wanna be just like you..... but my wife won't let me! I'm still stalking a turbo kit online. After wheels FI is next!

99 GS3

iTrader: (14)

Just wear a pair of these, and then you can go do what ever the **** you want to do..

JeffTsai

iTrader: (1)

99gs3, lol nice one.

ROPADOPA, the car is still running on the GE ecu believe it or not haha. That's the only way it's possible for the car to pass the OBD-II inspecion. To read the datastream for the JDM ecu, just order a scan tool from overseas and that should work ok.

ROPADOPA

I see , i was thinking that you may have had a way to read the JDM ECU. I have been working on it , just not as easy as it seems. Thanks

88supramki

Hi Jeff, I see that your 2005 is a GTE swap. Is that one running off the GE ECU w/ a Piggyback? Or is it running the GTE ECU? Thanks for all of your knowledge!

erikbang

Around 6 psi of boost

Hardrvin

Outside air temperature shouldn't cause your AFR's to swing so much if any. There's a air intake sensor and it'll compensate for such.

However I don't think unplugging the o2 snesors is a good idea. Yes it'll force open loop operation but you're also not sure how many other failsafe mode issues you're running into. I wouldn't be surprised if the systems will also affect timing and shift logic as a by product. You'll loose cruise control if you have it functioning as well.

And it will cause your AFR's to be off based on ethanol content and fuel temperature.

The emanage ultimate and AEM FIC allow you to send a skewed reading back from the o2 so the stock ecu will not learn it out. The AFC does not have that capability. Hence why the greddy and FIC are better options amongst other reasons.

JeffTsai

iTrader: (1)

That one was on a standalone. Was making more power than was safely achievable on a piggyback. I have setup a few other cars with GTE swaps and utilizing the GE ecu and piggyback. They don't have any issues at all, and runs just as smooth as a NA-T car.

Then either system will be ok. The emanage can't control ignition timing on a v8 because of the way it operates. You will basically just run on the factory ignition map. The FIC can pull timing only.

The stock air temp calibration is setup for the stock injectors. Once you increase the injector size significantly, that factory air temp calibration will be way off. Trust me on this, I've tried several times in the past and it always resulted in the AFR being different at noon and night. The emanage has air temp adjustment tables. Unless you have the temp adjustment settings, the afr will change by a bit with temperature swings if you go from stock 270cc injectors to a set of 600-800cc.

The car will just run a static map all the time if you run with no O2 sensors. Shifting does not change, and the cruise control still works. It's a bad idea to do it because your AFR will not stay at a targeted 14.7. You will have to flash different maps during the day and night when the temperature changes.

Also, when tuning, you do not have to skew the O2 signal(unless you want to change the narrowband voltage oscillation a little bit to save some gas). Just tune so that the fuel trims stay in check and you're golden.

Bippu147

iTrader: (9)

Wrong. You're forgetting that along with temperature the air density changes as well. This is why factory cars have closed loop fuel function. IAT sensor won't compensate for much, especially if it's a boosted car. You'll be surprised how much the fuel curve will change with temperature.

If I needed to go piggy back I would run an HKS Fcon iS. You still have awesome resolution for tuning as well as good closed loop functionality. Nothing beats HKS's feedback compensation setups in the Vpro. It can use a 100Hz wideband sensor to it's full potential. You can change the correction volume as well as the sensor cycle time. It's also the fastest correction I've ever seen.

Only catch is you'll need an HKS Pro tuner to tune it, which is a good thing because typically HKS Pro certified tuners know their **** and will tune your car properly.

88supramki

Thanks! We're those swaps running stock O2 sensors? Would you suggest running a wideband concurrently or just stick with the stock ones since the piggyback can support the data that the GE ECU needs?

Hardrvin

Uh, why else do you think the intake air temp sensor is in there in the first place? To compensate for the charge density that exists due to the temperature difference.
So we are talking about the same thing only you assume that ecu compensates soley on o2 input which I'm going to tell you, you're wrong.

Bippu147

iTrader: (9)

Incorrect. Air density / charge density will also change with other variables such as elevation and humidity. You're telling me a temp sensor is going to pick up on that? LOL

I know O2 input isnt the only compensation table, I never said it was, that's your assumption. All the other fuel comp tables in the ECU are fixed values (water, air, accel, decel, speed, etc) the only one that changes is the O2 feedback table.

Just out of curiosity, what have you tuned, and what ecu's have you used?

Hardrvin

And for elevation you have the map sensor.

You assumed that our conversation shards strictly air temp has extended to barometric pressure as well.

Since you seem to want to push credentials now, I've tuned haltech, AEM, emanage, autronic, open source on Subaru. I'm also an engineer for a major oe.

Thinking more to the issues Jeff has seen with it swinging without having O2 input, I'm wondering if latency difference becomes the issue. Piggyback is doing stricly a pulse width compensation based on % size difference with no regard to lantency and how it alters your mid to low pulse width areas.