sc300 na-t tuning issues
11-05-11, 04:46 AM
#16
gte & na-t
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I think you are still a little too hung up on "How much Boost can I get" ,and not enough "What's the safest, most reliable way to tune my NA-T?"
They are not EPROM chippable, that's why the MAP ECU/FIC are the best options for running the Stock ECU.
The GTE ECU will control larger injectors then the GE ones, run on Speed-Density (MAP), and have coil-on plug ignitions.
I think you would have fun with a good MLS Headgasket, your 650's, a FIC, and a GTE ECU and Harness.
It'll run so good, you'll probably forget about the TT swap!
They are not EPROM chippable, that's why the MAP ECU/FIC are the best options for running the Stock ECU.
The GTE ECU will control larger injectors then the GE ones, run on Speed-Density (MAP), and have coil-on plug ignitions.
I think you would have fun with a good MLS Headgasket, your 650's, a FIC, and a GTE ECU and Harness.
It'll run so good, you'll probably forget about the TT swap!
I think the problem is that the OP doesn't want to spend the money on a piggyback and doesn't understand how to tune. 12lbs of boost isn't too difficult to tune. Just throw in some MKIII turbo 440s and set your FPR to around 36 PSI. Or Buy a wideband, piggyback and replace the headgasket.
the GTE ecu will run well for what you want to do and you can run it on the stock harness, It will be tons better than the stock ecu and you can run 20 psi on it with the right map sensor. You just need to add wires for the ignition and the MAP+IAT sensors to your harness, its not rocket science and there are diagrams.
If you get like a 2.5-3 bar map sensor to match your injectors and you wont need a piggyback.
larger map sensors (or an afc) does advance the timing, but the gte ecu is very conservative in boost stock so you could get away with 50% more than stock size (JDM 440cc) which gives 660cc and you are pretty much there.
Best part is you can upgrade to coilpacks, but if you want to still use the stock distributor you can also, and that means running less wires also.
If you get like a 2.5-3 bar map sensor to match your injectors and you wont need a piggyback.
larger map sensors (or an afc) does advance the timing, but the gte ecu is very conservative in boost stock so you could get away with 50% more than stock size (JDM 440cc) which gives 660cc and you are pretty much there.
Best part is you can upgrade to coilpacks, but if you want to still use the stock distributor you can also, and that means running less wires also.
Ali will tell you about the safc on stcok ge ecu lol not fun, you will be hating life
he's been there and done that.
11-06-11, 08:12 AM
#20
yes many people run the gm 3bar map sensor on the 2jzgte ecu with some larger injectors.
i dont see why you cant do it on a 1jz. I know 1jz and 2jz map sensors are interchangeable, unless it has something to do with the ecu's themselves.
I thought the timing would be too advanced in boost, but the gte ecu is so conservative, the stock timing for say 10 psi can actually be safe to run much higher than that with good gas. Also it runs so rich at WOT that you can be running more boost than the ecu thinks and be fine also, as long as you match the map sensor/injectors correctly, or you can get a piggyback to do that and make finer adjustments.
Of course there is a limit, which is why i would personally run the 2.5bar to keep things closer to target and still be able to boost 20 psi, with 500-600cc injectors.
Quickgs reminded me how horrible it was with the safc on the stock GE ecu. never again.
i dont see why you cant do it on a 1jz. I know 1jz and 2jz map sensors are interchangeable, unless it has something to do with the ecu's themselves.
I thought the timing would be too advanced in boost, but the gte ecu is so conservative, the stock timing for say 10 psi can actually be safe to run much higher than that with good gas. Also it runs so rich at WOT that you can be running more boost than the ecu thinks and be fine also, as long as you match the map sensor/injectors correctly, or you can get a piggyback to do that and make finer adjustments.
Of course there is a limit, which is why i would personally run the 2.5bar to keep things closer to target and still be able to boost 20 psi, with 500-600cc injectors.
Quickgs reminded me how horrible it was with the safc on the stock GE ecu. never again.
11-07-11, 01:31 PM
#22
gte & na-t
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^ lol i never used the stock ecu , but my first experience with na-t on stock ecu and safc was horrible, it's was my buddy's car...i hated the ride of boost as soon as it hits 4k rpm the car bugs down , jerk , and stalls it's was ridiculous maybe that's why i can't stand the stock ge ecu on boosted SC.
i know Ali and lexforlife went through the same stuff.
i know Ali and lexforlife went through the same stuff.
11-07-11, 06:08 PM
#25
gte & na-t
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it wasn't my car , i wasn't working on it ..i was just getting a ride to my friend house so i can finish my swap .
I never mess with na-t without ems it's a waste of time in my opinion .
And for 8-10 psi i would keep my car bone stock non turbo ge serioulsy that's just me.
it's too much trouble just for 10 psi, maybe i am the only one that feels like that.
it's not worth it.
11-08-11, 03:43 AM
#26
agree with ali x10000.. stock ge ecu has zero reference for positive pressure (boost) so once you hit above atmospheric pressure ecu goes crazy and your only saving grace as far as timing goes is your limited range knock sensors.. bad move imo for boost
05-23-16, 11:45 PM
#27
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^ lol i never used the stock ecu , but my first experience with na-t on stock ecu and safc was horrible, it's was my buddy's car...i hated the ride of boost as soon as it hits 4k rpm the car bugs down , jerk , and stalls it's was ridiculous maybe that's why i can't stand the stock ge ecu on boosted SC.
i know Ali and lexforlife went through the same stuff.
i know Ali and lexforlife went through the same stuff.
05-24-16, 09:28 AM
#28
yeah its called the tt ecu mod... everyone with a turbo is doing it.
once you use the 2jzgte ecu, it drive like a stock car and boost comes on perfect every time.
there is no fix for the ge ecu except completely bypassing it. some guys will tell you you can put huge injectors on there, pull the o2 sensors and blah blah blah, dont believe that crap it literally runs like crap like that as you just found out. instead of taking all the time to work around it, just replace it with a gte ecu it takes like a days worth of effort to do it without the coilpacks and the car will be much more fun to drive.
I know mine with the gte ecu is 1000x times better than any ge ecu combination, it idles perfect, it revs perfect, it cruises perfect, I can go from cruise and hammer it and the car knows exactly what I want, if I build a little boost on an uphill or downhill the ecu is always happy with that (ge ecu freaks out when it sees any boost especially on part throttle), I can slam into the rev limiter at 18 psi and it works like stock it gives a nice little pop ready to slam into the next gear and takes off again. it never even misses a beat. only complaint is there is a 115mph speed cut and a boost cut, but you can bypass those.
once you use the 2jzgte ecu, it drive like a stock car and boost comes on perfect every time.
there is no fix for the ge ecu except completely bypassing it. some guys will tell you you can put huge injectors on there, pull the o2 sensors and blah blah blah, dont believe that crap it literally runs like crap like that as you just found out. instead of taking all the time to work around it, just replace it with a gte ecu it takes like a days worth of effort to do it without the coilpacks and the car will be much more fun to drive.
I know mine with the gte ecu is 1000x times better than any ge ecu combination, it idles perfect, it revs perfect, it cruises perfect, I can go from cruise and hammer it and the car knows exactly what I want, if I build a little boost on an uphill or downhill the ecu is always happy with that (ge ecu freaks out when it sees any boost especially on part throttle), I can slam into the rev limiter at 18 psi and it works like stock it gives a nice little pop ready to slam into the next gear and takes off again. it never even misses a beat. only complaint is there is a 115mph speed cut and a boost cut, but you can bypass those.
Last edited by Ali SC3; 05-24-16 at 09:32 AM.
05-24-16, 02:04 PM
#29
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yeah its called the tt ecu mod... everyone with a turbo is doing it.
once you use the 2jzgte ecu, it drive like a stock car and boost comes on perfect every time.
there is no fix for the ge ecu except completely bypassing it. some guys will tell you you can put huge injectors on there, pull the o2 sensors and blah blah blah, dont believe that crap it literally runs like crap like that as you just found out. instead of taking all the time to work around it, just replace it with a gte ecu it takes like a days worth of effort to do it without the coilpacks and the car will be much more fun to drive.
I know mine with the gte ecu is 1000x times better than any ge ecu combination, it idles perfect, it revs perfect, it cruises perfect, I can go from cruise and hammer it and the car knows exactly what I want, if I build a little boost on an uphill or downhill the ecu is always happy with that (ge ecu freaks out when it sees any boost especially on part throttle), I can slam into the rev limiter at 18 psi and it works like stock it gives a nice little pop ready to slam into the next gear and takes off again. it never even misses a beat. only complaint is there is a 115mph speed cut and a boost cut, but you can bypass those.
once you use the 2jzgte ecu, it drive like a stock car and boost comes on perfect every time.
there is no fix for the ge ecu except completely bypassing it. some guys will tell you you can put huge injectors on there, pull the o2 sensors and blah blah blah, dont believe that crap it literally runs like crap like that as you just found out. instead of taking all the time to work around it, just replace it with a gte ecu it takes like a days worth of effort to do it without the coilpacks and the car will be much more fun to drive.
I know mine with the gte ecu is 1000x times better than any ge ecu combination, it idles perfect, it revs perfect, it cruises perfect, I can go from cruise and hammer it and the car knows exactly what I want, if I build a little boost on an uphill or downhill the ecu is always happy with that (ge ecu freaks out when it sees any boost especially on part throttle), I can slam into the rev limiter at 18 psi and it works like stock it gives a nice little pop ready to slam into the next gear and takes off again. it never even misses a beat. only complaint is there is a 115mph speed cut and a boost cut, but you can bypass those.
05-24-16, 02:14 PM
#30
heres the link its usually in the top of the main forum not the performance forum.
https://www.clublexus.com/forums/sc-...t-ecu-mod.html
https://www.clublexus.com/forums/sc-...t-ecu-mod.html
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