1jz gte (jza70) running rich

[milos1990]

hey all my 1j is running to rich under 10 to 1. i looked on dyno print out and the air fuel ratio just drops dramatically like almost virticly, 50kw drop too, can anyone help??

[the_random_hero]

Start with basics - check no vacuum/boost leaks, get ECU checked for errors, etc. I'd be paying particular attention to your O2 sensor.
Can you post the graph up? I am not sure what you mean by drops vertically...

[Bananaman]

My jza70 1jz also goes under 10 to 1, so that in itself might not be unusual, but it doesn't drop suddenly as you describe. Best post up your graph?

[rshuwy]

wow something up

with my 1j with a broken o2 sensor only dropped to 12 to 1.

[Z2TT]

o2 sensor feedback is only used for low load and cruise, when your trying to make power the ECU ignores the sensor feedback, but while on boost they do typically run very rich these engines.

[milos1990]

yeh will post it up wen i get car back from mechanics, putting HKS FCD and Greddy profec B specII boost controller hope fully thatll lean it out a bit. wats pissing me off is it has 160kw at wheels should be more like around the 200's somethings up

[Hengsta]

Milo mate, thats how 1J runs like when cruising untill you hit like 4000rpm then it starts to lean out. Exactly what happened when i got it dyno'ed. 160kw's? there serioulsly must be something wrong with it cause that not right. If i find my dyno chart i will show you it.

[Hengsta]

Found it

[wilbo666]

It is worth remembering that Dyno's are more of a tuning tool than a power measuring tool.

Each dyno will read differently in regards to power.

Dropping off the AFR charts is exactly what most turbo Toyota engines do when they get on boost, so it's not abnormal if you ask me.

160rwkw stock isn't the lowest figure in the world to be honest. Why don't you take it down the 1/4 mile and find out what the MPH is... it's a much better indication of power if you measure he weight of the car (weigh bridge).



Cheers
Wilbo

[Officer Doofy]

^
So true

160 atw is close to what a un modded motor would do, what boost is it running for that figure and what mods? cooler, zaust, dumps???

[milos1990]

heng wat after market mods did u have running with it besides fmic and exhaust wen u had it dynod?

[milos1990]

i bought this car off him, it has zhaust, cooler, dumps, no boost controller, it ran 11 psi wen i got it dynod, im pretty sure wen he got 209kw he had the exact mods as its got now

[Hengsta]

Nothing else...

Still the same since that dyno day (unless you changed a few things on it since you got it off me.)

When i had it, it was FMIC, 3" Exhaust and Twin Dumps from turbos and 11.8psi stock boost.

Wilbo: To the 1/4 mile run you talking about... I would of taken it for a run IF we had a open track down here in Adelaide but we fucking dont cause of our premier.

Off topic, milo yo using the bride seat anychance? clutch still going strong? That reminds me IT COULD be the clutch that is slipping that MIGHT be why its making 160kw.

[milos1990]

same mods on atm 11psi stock boost, tomorrow it will be equipped with greddy profec 2 controller and HKS FCD . and about that seat yeh i gave that seat away stupid idea lol the clutch hasnt slipped on me, but may hav on my mate once while he was driving but we wernt sure tho

[Hengsta]

Noooo dude i wanted that seat lol..

Put that clutch i gave you in and then get it dyno'ed again cause i reakon its slipping on the dyno thats why its getting 160kw's. As i said to you that clutch was slipping after the drift day i went to and i didnt drive it since untill you got it off me. Im suprise the clutch is still hanging there lol.

Remember i still want the flywheel thats in the car now. So let me know when you got it out.