With 850cc injectors you have no choice but to use a standalone. To make the car OBD2 compliant it will be wired up like the 99% of the turbo IS where standalone controls fuel & spark. Pretty much any standalone will work as long as you simulate the missing signals i.e. IGF & post cat. The main table you'll need is the ability to control your closed loop fuel system. You need to be able to set your target air/fuel ratios and control the rate at which the changes will be done as well as how big the changes are. After that it's all in the tune. Be sure to get the car to idle as lean as possible without causing any misfires as well. If I remember correctly there's a member here that got all the necessary OBD2 monitors ready while running an AEM so it can be done. Just takes time to find the correct target air/fuel ratios and settings.
With 850cc injectors you have no choice but to use a standalone. To make the car OBD2 compliant it will be wired up like the 99% of the turbo IS where standalone controls fuel & spark. Pretty much any standalone will work as long as you simulate the missing signals i.e. IGF & post cat. The main table you'll need is the ability to control your closed loop fuel system. You need to be able to set your target air/fuel ratios and control the rate at which the changes will be done as well as how big the changes are. After that it's all in the tune. Be sure to get the car to idle as lean as possible without causing any misfires as well. If I remember correctly there's a member here that got all the necessary OBD2 monitors ready while running an AEM so it can be done. Just takes time to find the correct target air/fuel ratios and settings.
cool....gotcha....im looking into the haltech platinum 2000.....is there anyone that makes a pnp harness for the is300?
would probably recommend the aem just because of the knowledge already written in stone on these boards on the setup. The setup has been done passing emissions with alot of trial and error but its still a very flaky thing to get done. i wish the best of luck, i know its not easy task but nothing really is with our cars. my emissions sticker here in texas is already almost up. im lucky enough to have a friend that lives in farm country where they simply check blinkers ect.. but i am still technically lieing and haggling to pass and have a legal street car. liberal's suck...... period
It really comes down to who is tuning your car and what they are comfortable with. Any engine management is just a useless box with features until you get it properly setup and tuned.
That said, there are a few standouts in what is likely to work best. I'd probably turn to Swiftracing and buy their E6X kit. You know that will setup properly and have documentation and support to get it installed. Tuning should be straightforward with most tuners.
I've yet to be convinced about the AEM. I just haven't heard much on complete sucess with that unit in terms of install/setup let alone tune.
Adn while I don't recommend it for you since very few tuners and people know how to set it up properly, I will ultimately be using the EMU for my car for 500hp.
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Completely owner built and tuned.
It really comes down to who is tuning your car and what they are comfortable with. Any engine management is just a useless box with features until you get it properly setup and tuned.
That said, there are a few standouts in what is likely to work best. I'd probably turn to Swiftracing and buy their E6X kit. You know that will setup properly and have documentation and support to get it installed. Tuning should be straightforward with most tuners.
I've yet to be convinced about the AEM. I just haven't heard much on complete sucess with that unit in terms of install/setup let alone tune.
Adn while I don't recommend it for you since very few tuners and people know how to set it up properly, I will ultimately be using the EMU for my car for 500hp.
after more searching....i think im going to have to switch to a standalone been looking into the Vi-pec which my tuner suggested.....just scared about the emission but he might be able to get it to pass with the vi-pec.....or if not then i will just keep the stock ecu with FIC and plug that back in when emissions comes....
I'm pretty sure there's no standalone available that has the ability to speak the OBD2 protocol. If there are then it's probably an unadvertised secret. AFAIK the HKS VPro can be tuned to pass the OBD2 plug-in test, it's been done on the 350Z and Supras. The AEM and TEC3 have been tuned to pass the OBD2 plug-in test for the IS.
Here's a silly thought, the MegaSquirt is open source...if someone has a lot of free time you can probably build the OBD2 system or better yet...generate the right signals to keep the stock ECU happy and let the stock ECU do the OBD2 talking.
I've yet to be convinced about the AEM. I just haven't heard much on complete sucess with that unit in terms of install/setup let alone tune.
Adn while I don't recommend it for you since very few tuners and people know how to set it up properly, I will ultimately be using the EMU for my car for 500hp.
Agreed, I am also going to be using my EMU to make 500hp with my car.
With the E6x, wouldn't it make it even harder to tune to pass emissions/make the OE computer happy? I'm read batch fire is not as good as sequential if going under the sniffer-- but, megasquirt guys have tuned to pass the sniffer.
Leo, if running a 4cyl you can now build a microsquirt setup to be sequential! Building one for a friends AE86.
With the E6x, wouldn't it make it even harder to tune to pass emissions/make the OE computer happy? I'm read batch fire is not as good as sequential if going under the sniffer-- but, megasquirt guys have tuned to pass the sniffer.
Leo, if running a 4cyl you can now build a microsquirt setup to be sequential! Building one for a friends AE86.
I vaguely remember the E6X didn't have a closed loop table where you can set the target air/fuel ratios for load & engine speed. It had a stoich voltage and would try to maintain that voltage during cruising speeds. Someone correct me if I'm totally wrong. If that's the case then it will be very tricky to not trigger a bank too lean code. The stock ECU likes to see a slightly richer air/fuel ratio during cruise but at lighter loads is fine with being at stoich. Other that that, I don't see it would be any harder to make the ECU happy with the simulators. Tuning for the sniffer is completely different, money talks and can probably get you to pass but I've heard/read stories of using higher octane, alcohol, and using an air pump in the exhaust stream. Massachusetts doesn't have to deal with that so I never got a chance to experience it first hand.
What would be cool is if you can actually use an available input and output from the MS to simulate the narrowband. Imagine if you can reconfigure an input to measure the amount of time injector 1 is grounded for then generate a .45 volt to simulate the narrowband. Measure the time again, if the new time is greater than the old time generate a .48 volt. If it's less then generate a .42 volt signal. Repeat those steps for the whole duration, +/-.3 volts, of time the engine is running. In theory the ECU will keep the fuel trims very close to 0% since the narrowband signals are changing relative to the injector pulsewidth. No more long term fuel trim CELs! It's all opensource code, just need to have someone with a lot of free time to experiment.
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