187

Thanks Ali its nice to know what's going on somewhat. I thought the ecu might figure it out by trimming fuel itself, but i guess that's not the case. I'll have to try the o2 test you suggested, I have no real issue getting a safc at this point if it makes the car usable.


Also about that idle i mentioned, both times it was at normal operating temp but only once did it drop. Which is why i thought it might be worth mentioning.

Ali SC3

iTrader: (10)

I usually need to reset it to figure if its different or not. sometimes you need to actually give it a full cycle for it to go through the learn procedure. its not an exact science which is why it helps to make small adjustments or just close it to where its idling at 650 and work on fixing the fuel. my manual ecu will want to hold a higher rpm until I actually come to a stop so its not like it will dive to 650 right away when its working right.

187

Yeah i need to bring that idle down but its right on the edge so the throttle response is really crispy.

With a safc would you cut say 18% across the board, or just on the low end?

187

Might not need that safc after all, made one change(re-installed the stock maf). Got about 50% better so now when it revs down is pops instead of a full bog. I tried to adjust it even better but I need to do another full reset on the tps. I was pretty excited seeing the afr sit at 14.7 and not go back and forth haha.

Also I tried the unplugging the 02's but it kind of just acted normal. Did I have to reset the ecu first?

D101

Will the aristo ecu mod work on a is300 with a manual trans?? Or do I have to get the supra ecu?

aznexus

Correct me if I'm wrong, but I think you need the newer Aristo ECUs in order for your harness to fit the ECU. The older 2jz ECUs use a different harness.

This might help: http://my.is/forums/f114/vvt-i-arist...u-help-433351/

187

Found this, pretty significant change is pressure.

Also the 2jz-ge maf doesn't work in boost lol.

*edit - Looked up the parts and they list it at 44 psi for the GE and 37 psi for the GTE.

Ali SC3

iTrader: (10)

I think you highlighted the wrong box on the left. thats with the vac hose disconnected. if you look on the right with the vac hose disconnected the gte is 33-40 psi at idle which is an overlapping range for the most part with the ge 38-44. with the vac hose connected at idle the GE is 28-34 which is close to the gte 24-31. definitely not exact but the ranges are similar, the ge is a touch higher but it shouldn't throw it off that bad. one could use an aftermarket regulator to dial it in of course but I don't think its needed.
so it drives well with the ge maf out of boost, but doesn't like boost... what does it do if you don't mind sharing?
Also the gte maf its good in boost but not down low... that is def interesting to say the least, will have to think about that one and get back to you.
the smaller maf should register more airflow so prob has something to do with that. maybe maf position does matter or possibly the type of filter, mafs do funny things sometimes.

187

I was thinking maybe a smaller intake sized to the maf size may do something. But with the ge maf as soon as i hit 4000rpm it dumped fuel and stopped revving. But yes you can drive 100% out of boost. Kind of weird considering I start spooling lower than that.

I ordered a stock fpr pretty much for piece of mind. I have had that issue with constant priming so I was also curious if the fpr difference had any effect.

I did realize after the boxes were off but I was being lazy.

BuffNStuff

Just did some research on the difference between fuel injectors between obd1 sc300, obd2 sc300, and is300.

I don't think we can use is300 injectors in our obd2 sc300s. The obd2 sc300 is like if the is300 and the obd1 injectors had a baby. The top o rings on the is300 injectors are different than the sc300 o rings for both obd1 and obd2. The bottom o rings for the is300 look to be the same as obd2 sc300.

187

I'm actually running a set of injectors made for 98-whatever sc/is/gs 300's.

BuffNStuff

The is300 injectors fit into the stock rail with no issues?

Ali SC3

iTrader: (10)

I would figure the injector body is the same because denso only makes so many types of those, just need the right orings, but I would think those are the same also.

I think all of you guys are stumbling because of the stock maf, and what I read on supraforums it is common when using with single turbo. I think the single just does not flow the air down low like the twins do and it creates a discrepencey which you can tune out with the map sensor/fuel piggyback. maybe its time for a map ecu or a vpc and just go map sensor on the us ecu. lots of people do that.
this thread sort of confirms my suspisions that its not an na-t problem, but a single turbo supra ecu problem.
http://www.supraforums.com/forum/sho...and-stock-MAF&
http://www.supraforums.com/forum/sho...-single-turbo&

I wasn't 100% sure it was needed but now I am thinking it is if you want to avoid the stalling issue with a big turbo.
vpc/safc come up all the time and then you can fin tune your injectors. I prefer a map ecu unit as its all built in one and will let you set boost cut wherever you want. if you are up to a wiring challenge the fi/c can do all of that and more and even o2 simluators and crazy good obd2 related stuff.

When I try out the usdm ecu I will likely be using a map ecu with it, if you can get a hold of one they work rather well with these ecu's and are simple to use. something about turbos and mafs don't work so well once you start modifying.

187

Interesting, maybe if my T61 was actually T61 sized it would be better.

Maybe usdm ecu and adapting usdm twins would be the best option since most of us are limited to the w58 anyway.

Ali SC3

iTrader: (10)

The twins would be hard to put on our motors without changing the head. The answer is a vpc/safc or map ecu or an aem fic. this would have been avoided with the jdm ecu, but you guys can't run the jdm ecu. at least you get to use 550cc injectors stock though which means you can probably push more power easier later and you will be able to adjust it some more.