My car is EPL tuned with Alpha turbos running about 1.3 bar
for some time now I noticed some popping coming from the rear when I accelerate hard. It sounds about like 10 quick little pops in about 3 or so seconds. If i lift the throttle or keep the boost below about 1 bar it does it much less or does not do it at all. In the summer i only noticed this a little if i stepped on the gas before the engine was fully warmed. Now with it cold. I get it no matter if the engine is fully warmed or not. I dont feel the power fall off. It does not have the ping type sound of knock from low octane and the frequency is slower then most low octane knock i have heard... but i really have never heard this car knock from octane.

The car has turbo intake pipes.
meth water injection
IPD plenum
and epl tuned alpha turbos.

any of you ever get similar sounds? got any ideas?

 

Your car's too fast and you or passenger are sh*tting themselves? ;-)

Does the popping sound like engine mechanical or suspension related? Hard to tell from your description. If it's coming from the engine, it could be misfires. Try logging the misfire values with durametric when you do some pulls.

 

i would renew spark plugs and check coils with your issue

 

Detonation- stop driving so you dont blow it up.... popping noise like popcorn is detonation.... log the car ASAP and call your tuner...

 

Plus 1. Fuel pump/filter?

 

Yep,
look for this , melted socket etc... in pic the housing is brown/melted...

 

Could be the wast gates banging open and closed.

 

yes sounds like popcorn. i could not find a good way to describe it.
I will look for that sockes marskei and log and send to EPL asap.
thanks

 

looking at a couple of 996 tt's. Subscribed for updates.

 

Popping noses are most often signs of detonation ( not directly associated with the tune ) as it could be the harness on the tank due to a bad pump as I noted or even bad fuel... but when a shop blows the cats out of the housing at 1.7 bar and makes the exhaust look really bad on dyno then goes on FB and twitter, etc. slamming the manufacturer without even a courtesy call or known facts... how "irresponsible" to say the least is that... things that make you go hmmm Tony... just a friendly reminder...

 

marksi im giving you a rep point right this second.

 

I'm popping popcorn............here we go.......get ready. LOL

 

I like popcorn!

 

Marski,

I'm not sure where you're getting your facts but here is clarification since you are bringing this up again.

1. we ran 1.30-1.35 bar boost, not 1.7 bar. I'm looking at the dyno graphs right in front of me.
2. The back to back test of your exhaust and another exhaust (which we have nothing to gain from and we haven't even sold one of theirs since the test) was put on our Truth blog and linked here, that's it. We didn't put it out anywhere else.
3. The catalytic converted you used on your exhaust system the customer bought from you was a $60 generic replacement cat. I've seen those type of cats fail numerous times on anything making decent HP. There is a reason we and other companies use cats that cost $500+ each. They are designed for Motorsports and higher HP applications. Using a cheap generic replacement cat in a high performance exhaust is irresponsible in my opinion, hopefully you've changed your catalytic converter choice.

Iv'e been building and tuning cars for over for over 15 years, we tune over 1000 cars a year here, with some approaching 2000hp. I've tested and designed exhaust systems for along time and I know what works and what doesn't. A louvered type exhaust baffle is horrible for turbocharged applications, it's not just an opinion, it is fact. It makes exhaust quieter and may work for an NA application but bad for backpressure and turbo engines.

I've since tested another companies product for a different car that had louvered design muffler...it made less HP than stock and I have backpressure data to show it!!!! No I won't mention the car or the company, it appears people don't want the truth, just marketing hype.

When I presented this originally I had data, test results, etc.. so I wasn't making a quick irresponsible judgement.

I have no opinion on this particular misfire/popping noise issue this person is having because nobody has any facts besides a noise interpreted by the owner of the car.

Without actually hearing it and doing diagnosis it could be a bunch of different things; Ignition misfire, lean misfire, detonation, etc.

I will say that if it is colder now the air density is higher, so the car is making more power. Also depending on how boost is controlled (stock or aftermarket BC?), without a good closed loop system the boost will be higher in cold weather. So most likely the car is making more power from higher air density and possibly higher boost. More power = stress on ignition system, more fuel requirements, higher cylinder pressure, etc. Take logs and go from there.


Best regards,

Martin Musial
President -AMS performance

 

Lol , ouch .. How does your foot taste? Just accept your peice of humble pie