Can it handle it??

SAM@GTM

So, does anyone here know what the symptoms of a bad injector are?

Econ

doesnt start smoothly, uneasy idling, decreased acceleration, decreased gas mileage, gas odor inside cabin


am i hitting anything?

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2014 Triumph Thruxton 900
2013 Fiat 500 Abarth
2009 Nissan 370z

SAM@GTM

You covered a lot of it. There's really multiple definitions of a "bad injector" it could cause the car to run on 5 cylinders, the exhaust will be popping, rough idle, also our cars equipped with 7 different misfire codes. There's a P0300 that covers random misfire, then there is P0301 - p0306 which is cylinder specific misfire. If Eric's car had a bad injector on a specific cylinder, a specific code would have been present.

Making the statement that the car had a bad injector and that is why the car was detonating is such a blanket statement and is inaccurate. We spent 20 hrs diagnosing this particular car and logging all the ECU parameters via Cipher and Nissan's ConsultIII Factory Diagnostic Tool. At no point was there any indication of one bad injector. If you have a bad injector on one of the banks of the engine, your correction factor will be different since one wideband on a particular bank will read richer or leaner. Eric's car did not have that symptom.

If you have a bad injector, you will have a rich or a lean code since the bad injector will spray too much or not enough fuel which will alter the AFR target. The factory ECU pays very close attention to the correction factor and the differences between bank 1 and bank 2. The minute it sees any serious variation, it will throw a code.

Another indication of knowing whether you have a problem with a particular cylinder with a bad injector is to remove and check the spark plugs. This is an old fashioned way of getting a clear idea of how your combustion chamber is operating. If you remove the spark plugs and they all have a similar brownish color, that is an indication of a nice healthy combustion. When you have a bad injector, you'll notice that particular spark plug will be extremely white from running lean, or extremely black from running excessively rich.

Now if we start talking about spray pattern, this will open up a completely different front. Keep in mind that the DW injectors are modified Denso injectors although they will never be perfect like an OEM factory unmodified injector.

As far as why Eric's car was not running properly, the information was shared with Eric and I was very tempted to really share all my logs and the things I found, but I did not want to start a shitstorm, so I left it alone.

Sam

Mr.Squeeze

Since you decided to chime I would like to ask you this about Erics car. In your thread that you maid you mentioned that you could not get a ccurate air fuel at the tail pipe why check there in the first place? Also when you put the bung in the correct location and saw AFR of high 13's did you try and tune the car? to confirm 100 percent that the kit had design flaws.

Now I know what some of the flaws are with this kit if your trying to make a decent amount of power. But at Eric's power level I really dont see a reason why it wouldnt work with a good tune. Witch i know your more than capable of your one of the best tuners in the country.

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Driven Motorsports Single Turbo 7675 T4 1.32 A/R 995WHP 780TQ

esfourteen

Maybe I am wrong, but I don't think there is any way to tell without an EGT probe in each manifold runner to detect the lean condition. The injector was only found to be faulty after sending them to be tested.

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Build Thread | GTM TT Install Thread | Engine Build Thread

toner123

My main point being is I am worried for the other people that might have issues and i don't want to see miss fortune come to them because someone didn't want to tell the cause of a problem. I am a american and I am a firm believer in trial before conviction. I don't want to see stillen convicted for something that was not there fault.

@Sam by all means jump in on this to help with the situation. Like I said my main concern is for the people that might have a faulty injector because of a bad lot. I am not sticking up for anyone in this situation but if a faulty injector can be the cause of the problem or can cause further problem then I feel people should be aware of it and not just dump the blame on stillen

Mr.Squeeze

One bad injector does not mean everyone that has a Stillen kit has a bad one no reason to press the panic button.Im not sure why your choosing to put everybody's issues with the Stillen kit into a injector that went bad on my set up.Stillen is not to blaim at all ,I know what happened when my self and two of my friends pulled the engine. How the top of one piston in one cylinder only melted no other signs of detention in the others
detention period I can go on and on.

I am not here to start a fight with you SAM or anybody else.This thread was started because a person wanted to get info about the Stillen kit.The thread then went left field with GTM Stillen Comparison thread attacks in the thread ,and tags on the thread.

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Driven Motorsports Single Turbo 7675 T4 1.32 A/R 995WHP 780TQ

toner123

Interesting. When did I blame stillen? yea let me know when you find that one. Didn't intend to start a panic frenzy as I was not the one who initially brought this up. Also there are a few others that had the same problem as weiboy did and this is why I said it. I didn't tell everyone who had the stillen kit to run out and test there injectors. I was more so saying to the people that are having issues that they might want to get this checked out. If you were having issues with your car that matched the issues I had, and it turned out I found something that was messed up, wouldn't you want me to share it with you? Also if I told you I had a bad injector you wouldn't go have yours tested? Now keep in mind there are a few others that are having the same issue that weiboy did. I think you might want to reread my posts. Sorry if I pissed you off by bringing something up you wanted to keep to your self but then again I am not the one who said there was a bad injector.

Mr.Squeeze

No need to re-read your post my reply to you was because you took it to Stillen convicted for something that was not there fault.That with along with you dont want to see other people have the same issues because of the problem not being posted.I have a custom set up that mean risk by me and only me.Everything was going to be posted in due time once I was done with my build to late for that now lol.

Why even take it there 90 percent of the people with this kit run a genric flash on 91 octane.This is something that my set doesnt have or something I will ever do without getting checked out. I highly doubt that all those people out there with Stillen kits that had problems all have a bad injector that is so far fetch.

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Driven Motorsports Single Turbo 7675 T4 1.32 A/R 995WHP 780TQ

toner123

I am not even going to entertain the first paragraph like i said you need to got reread my post because you took what I said the wrong way.

You missed my point but ok. I don't know what you do for a living but i am a maintainer on helicopters. I have seen it a few times where bad lots of parts had come out. To where they recall a bunch of the same part during a certain manufacture period. Most of the time the way it gets found out is because people like me install the part, **** don't work right we return it and get another one and it don't work right. We do a investigation found out they had the approx same manufacture date and turns out they are bad parts for one reason or another and they get recalled. You really don't think this happens in the auto business? If that is the case then i am afraid you are mistaken. This year alone it happened two times already. Ohh also a lot of companies that make the parts for my helicopter are also making parts that you are putting on your car or have on your car already. Is it common this happens. The answer to that is no but it does from time to time. I am not saying it is going to be everyones problem that has the kit or fix the issues that the few are having but you really think it is not worth checking? Also considering you got your injectors from weiboy and others are having the same issue as him. Call it what you will. You play rush and roulette with this mod game and sucks to say you ate the bullet on this one but there are ways to reduce the chance of you getting the bullet and I fell this is one of them. I know if I had the kit and I had issues with it i would be getting it checked to make sure and ease off the mind. Or hey keep driving with a car having detonation and put a new motor in it instead of ruling out possibilities based off others experience. I personally think your so exclusive set up had zero impact on the injectors unless you did something to them.