Yellows on a non sti ecu

[GregNZ101]

One of my work mates was saying that the ecu can sense that the ecu is running yellows, instead of grays, and automatically adjusts. Can anyone confirm or deny this? My car is a V4 WRX.

Thanks

[Guest boostin]

Some of those JDM WRX's run yellows factory.

The oxygen sensor (if working properly) gives feedback to the ECU, and the ECU can adjust cruise mixture by +/- 25%. The difference between yellows and greys is only about 16%, so in theory the ECU should be able to cope with just dropping in yellows.

[Guest]

I wouldn't do it, On wide open throttle the ECU doesn't measure air fuel ratios as the stock ones are narrow band so aimed at cruising and light load,

you will be getting approx 16% more fuel over the whole rev range, so thats a whole lot of wasted gas and possible engine damage.

If you want to upgrade injectors you should either get a factory ECU to suit or even better would be an aftermarket ECU, or a chipped one may work.

[Koom]

 GETLOW said:

I wouldn't do it, On wide open throttle the ECU doesn't measure air fuel ratios as the stock ones are narrow band so aimed at cruising and light load,

you will be getting approx 16% more fuel over the whole rev range, so thats a whole lot of wasted gas and possible engine damage.

If you want to upgrade injectors you should either get a factory ECU to suit or even better would be an aftermarket ECU, or a chipped one may work.

I fully agree with this. Many people here don't seem to but there's alot of stuff done by people on here that I wouldn't dream of putting my engine through.

[Stoffa]

I had a mate put yelllows in a stock v2 wrx about 50,000 kms ago, I tried telling him its not quite right. He use to drive it hard everywhere. Sold it and its still running sweet as now (cars up over 150,000kms now)

[Guest boostcut]

same as me^^^ apart from a small amount of black smoke on boost, the car runs mint, never had a problem with it.

[Guest]

haha dodgy subaru owners, I suppose the stock ECU tunes arn't the best and there not alot bigger so you can get away with it,

though some food for though is that overly rich mixtures can be just as dangerous as lean mixtures.

Most other cars you can't get away with it running very well at all.

Has your setup changed since we did that dyno run Greg? as from memory it was runnig safly?

[Guest boostcut]

well a v2 wrx wont have the same sort of hardcore tune as say a v10 sti so yeah im sure it can get away with it, i did the swap without even knowing that it may not work so im stoked that they do work.

[GregNZ101]

I’m now running a mines tuned ecu which added a few kW’s and I have a vf22 sitting in my room. If I do any more mods I think I will defiantly run out of fuel, which would be disastrous

I’m not going to be able to drive it soon for about 6 months due to being away with work, might just get a v7 sti after, who needs a home loan deposit anyways. lol

[Guest boostin]

 GregNZ101 said:

I’m now running a mines tuned ecu which added a few kW’s and I have a vf22 sitting in my room. If I do any more mods I think I will defiantly run out of fuel, which would be disastrous

I’m not going to be able to drive it soon for about 6 months due to being away with work, might just get a v7 sti after, who needs a home loan deposit anyways. lol

Once you buy a house you won't be spending money on your car. I found that out the hard way.... :'(

[Guest]

or when your partner/wife has a baby funds get cut and so does car time.. well for me thats how it worked.. lucky I do it for a Job to get the car bug outa me with out spending any $$..

It would be intersting to see how well its running on the Mines ECU. I know with Nissans they don't run very safly as there tuned for the superior jap pump gas.

[GregNZ101]

It runs wells it was tuned on a 9 to 1 c/r and my bottom end is a bit under 8.5 to 1, so its not giving me any problems

It also seems to be saving me about 1L per 100km of fuel