Just installed a 19% pulley, colder plugs, belt and all the motor mounts (wasn't planed). I read somewhere here that the ECU has to learn after changes are made. I wanted to know how much driving or time will it take for the ECU to learn. The car runs great and no CEL so far.

 

Have you done the ECU reset? If not, you can find it here.

I'm not sure how long it takes for the ECU to relearn your driving style once you do this.

 

Not too many folks running that big of a reduction. Curious to see how it holds out.

 

I did not reset it but I had the battery disconnected for 2 days while i was working on it. I think the ECU resets after the battery has been disconnected for awhile

 

I was going to go with a 17% but got a deal on the 19%. I don't race on the track mostly just a daily driver back and forth to work. If the 19% starts to throw codes or eat belt I could just swap out to a smaller pulley. Now that I've done it would probably take less than an hour to swap it out. As of now i'm really like the power band with the 19%.

 

Most people don't use the 19% because of durability and heat issues...but let us know how it all goes. I think the hardest part of upgrading the pulley is the removal of the stock one so you should be able to swap out rather quickly.

 

I was suprised the stock pulley came right off. I guess using the correct tools really makes a the job easier. If I had to do it again I could cut the time to about and hour or so. I read a lot on NAM and decided the type of driving I do the 19% should not be much of an issue. I mostly drive back and forth to work half freeway and half city driving. I did notice I was getting better fuel milage on the way to work today

 

do you have anything to read any diagnostics? scangauge or ultragauge, or dedicatd gauges? would like to know air intake temps, boost, and i would not go to high in the revs you are going to run out of fuel real quick with the stock s injectors. even with jcw injectors. i plan on getting a 19% as well

 

Shouldn't take too long, it will make adaptations as you drive, and will set those adaptations everytime you turn the car off for more than 5 min. (less than that & they will not set and you'll be starting off from the last set point again) Hard to tell how long it will take overall, all depends on how the car likes each change as to if it stays that way or not, again the "every car is different" scenario comes into play here.

 

I was driving home from work today and I noticed the AIT was around 112 temp outside was 92 on a SCII. The highest temperature I saw was 130. I've only had it on for about 1 1\2 days. Today was the first day I really got to drive it. I saw about 13.5 lbs if boost yesterday but I only got to about 9.5 with the stock set up. could be the scangauge not being ss accurate as a stand alone gauge.

 

did you lay into the throttle at all? you should see more than that even with a sc or ug AIT looks good. thanks for being another test rat lol. it will give me even more reason to get the 19 haha cant wait lol

 

This is just the start of being test rat.still have more upgrades in the future just getting started. I did get on it but the SG is a little slow and it hard to watch it with cars around you. Ill ill set my phone up to record it so I can review it later. I still have the stock IC boots not sure if they are holding the boost. I have new boots just hsve not put them on yet

 

With a 19% pulley it's recommended going with some JCW injectors to get the fuel where you need it.

 

will the stock ECU work with the injectors? Also what kind of gains over the stock injectors could I expect? Is there any harm having the stock injectors in for now

 

I bought my R53 30k miles ago with a 19% already on and have used it as my DD. It had a stock intake, stock SC & IC, nology hotwires, stock ECU, and milltek exhaust for drivetrain mods. I have no issues with the 19%, except for an often flat spot between 2800 and 3200 rpms. Put a Cravenspeed CIA on a few months ago and picked up some good top end power. I plan to change to a 15% soon so I can track it this fall.

 

I bought my R53 30k miles ago with a 19% already on and have used it as my DD. It had a stock intake, stock SC & IC, nology hotwires, stock ECU, and milltek exhaust for drivetrain mods. I have no issues with the 19%, except for an often flat spot between 2800 and 3200 rpms. Put a Cravenspeed CIA on a few months ago and picked up some good top end power. I plan to change to a 15% soon so I can track it this fall.

 

Yes the ECU will adapt itself to the JCW 380's (nothing larger w/o a custom tune) as far as gains they will be minimal, but thats not the reason for them, the purpose of the larger injectors (any of them) is to be sure you're supplying enough fuel to match the amount of air you're putting into the engine.

You can run the stock 330's, but with a 19% pulley you'll be maxing out their duty cycle early, I wouldn't be running it @ WOT much over 6300 until you change them.

And, your stock I/C boots will work just fine (usually better sealing than silicone, more flexability) I'm using stock boots w/ a solid 20# of boost.

 

I had the same flat spot when it was stock. Really noticable with the A/C on. Not as noticable with the 19% on but still there. I plan on doing a CAI next then maybe injectors as time and money comes avalible. Exhaust down the road. Probably rear sway bar and coil overs before the Exhaust.

 

[QUOTE=BlwnAway;3788185]Yes the ECU will adapt itself to the JCW 380's (nothing larger w/o a custom tune) as far as gains they will be minimal, but thats not the reason for them, the purpose of the larger injectors (any of them) is to be sure you're supplying enough fuel to match the amount of air you're putting into the engine.

You can run the stock 330's, but with a 19% pulley you'll be maxing out their duty cycle early, I wouldn't be running it @ WOT much over 6300 until you change them.

And, your stock I/C boots will work just fine (usually better sealing than silicone, more flexability) I'm using stock boots w/ a solid 20# of boost.[/QUOTE

could I go to even a bigger injector(440) with the stock ECU so later if I get a tune it will already be good to go? Or will it jack it up without a tune?

 

Yeah you definitely want to get some new injectors as others have stated.

I believe the r53 runs kind of rich in stock form. You might be running a bit too lean because of the 19% pulley...leading to better fuel economy for sure but not the safest operating condition

 

Was able to give it WOT today on the way to work boost went to 15.2 on a SG2 at between 5500-6200 RPM. So that is about 6 or so more psi of boost compared to the stock set up. It starts to pull at a much lower RPM than before and pulls all the way up. I didn't realize I was going 106 mph in 4th gear. For some reason the car does not seem like it is going as fast as it is. I let my daughter drive it the before I did the pulley and she told me the speedometer has to be off because "it said I was going 90 and there was no way i was going that fast." I took her out and turned on my GPS and the Speedometer was only about 2 MPH's off at 90 MPH

 

No, nothing larger than the 380's on any "factory" tune, anything larger & the car won't even run enough for you to swap them & drive to where you're having it tuned

 

I've read on here about people getting the JCW tune put in. Is it worth paying to get the ECU flashed with this tune or just leave it stock. I know someone who's brother is a tech for BMW may be able to get it done on the side and not have to pay the dealers prices.

 

well its better than nothing, and it smooths out the engine, if you dont plan on geting a tune for a long time than it could be a wise dessicon to do it.

after i install a 19% and 380s i plan on getting the 210hp jcw tune cuz i dont plan on getting a tune for a long long time till i put a cam in and even bigger injectors. waste of money? maybe... but it should make it safer for the time being.

 

Have you looked into the cost of the JCW tune from the dealer. Or can someone with the right tools do it independently. Will the 210 HP tune acually get you to 210 hp with the injectors and pulley?