How long do K04's tend to last, both under stock K03 chip programming and stg 3 programming?
05-13-2008, 04:14 PM
#1
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How long do K04's tend to last, both under stock K03 chip programming and stg 3 programming?
Looking to buy an s4, wondering if I'd be better off trying to find one with bad turbos/cheaper price and just k04'ing it from the start and using stock k03 chip programming (giac or apr) and upgrading things like fueling, braking, etc later. How much more reliable are these k04's over k03's?
05-13-2008, 04:20 PM
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Beware of KO4 on KO3 chipped sw. Always sketches me out, don't do it unless your monitoring...
KO4s flow more air at the same boost so you have a higher likelihood of running lean and doing serious damage. Run stock programming with the KO4s or get a specific STGIII- program and just keep an eye on it.
Back to the original question, from what I've been seeing, I'd scoop a S4 with some troubled snails and just get the KO4s out of the way, its inevitable.
Back to the original question, from what I've been seeing, I'd scoop a S4 with some troubled snails and just get the KO4s out of the way, its inevitable.
05-13-2008, 04:27 PM
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If you can afford to do it, I definitely would buy a cheaper S4 w/ bad K03s and immediately
throw in K04s. They're going to be more reliable than the K03s. I agree with nogarorich, I'd run the stock file with the K04s until you can afford fueling. You can run lean if you're not capping boost on the K03 file and monitoring everything.
05-13-2008, 04:48 PM
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Fueling is based on airflow. More air means the car would compensate with more fuel, to maintain
proper AFR.
How could KO4s make you run lean, as long as youre within the factory fueling capacity?
How could KO4s make you run lean, as long as youre within the factory fueling capacity?
05-13-2008, 05:03 PM
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GIAC X for example, requests an amount of boost that pretty much...
runs the stock injectors static. If you request that same amount of boost on KO4s, more air would flow and the injectors wouldn't be able to keep up.
Are you saying that there is no risk of running lean by tossing in KO4s and running a chip program? The vehicle can only adapt the fuel so much.
Are you saying that there is no risk of running lean by tossing in KO4s and running a chip program? The vehicle can only adapt the fuel so much.
05-13-2008, 05:04 PM
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I did a quick search and read it's safe if I cap the boost with a MBC.....
if I did it this way, I'd probably get the rs4 motor and tranny mounts out of the way too since the engine is out anyways. What other upgrades does one need exactly for stage 3- ?? And what kind of performance/reliability does that give?
05-13-2008, 05:09 PM
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I'd still make sure it was monitored.
I'd say, temporary 5bar FPR, some sort of exhaust, and clutch are probably the mandatory mods. It should be fairly reliable but who knows, its an S4. And if you run a chip and cap the boost with an MBC, depending on where you cap it probably anywhere from 315-330 wheel (?? speculation).
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05-13-2008, 05:16 PM
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The stock fueling has more head room than what GIAC X is written for.
GIAC's 3- program runs 20psi midrange on KO4s with stock fueling.
I dont really think there is a risk of running lean... running the same boost as KO3's, KO4's would produce more g/s and more fuel would be added to maintain desired AFR. I think stock injectors would keep up just fine with GIAC X desired boost and KO4s.
but maybe someone who knows more about tuning can give you a definitive answer.
I dont really think there is a risk of running lean... running the same boost as KO3's, KO4's would produce more g/s and more fuel would be added to maintain desired AFR. I think stock injectors would keep up just fine with GIAC X desired boost and KO4s.
but maybe someone who knows more about tuning can give you a definitive answer.
05-13-2008, 05:20 PM
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Alright, I'll take your word for it, I'd just say, make sure its monitored. On my swap,
I was told it could be dangerous. I personally am sucking it up and rolling in stock mode until fueling haha. O god, I can't wait for fueling.
05-13-2008, 05:25 PM
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All K03 chips taper boost on the top end, that's where you'd run the danger of going lean.
If you're letting the N75 handle the boost, you should be safe with K04's on a K03 chip.