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Discussion Starter · #1 ·
Okay so i already feel stupid for asking my question before researching, I’ve come to the conclusion that it’s detonation. Not sure why it would only happen in first gear but glad I’m catching it now. I only ever use 93 octane and the only mod to the engine is a forge bov, stock tune, never turned up the actuator. My intercooler is dented, but it’s not running any hotter than usual. I feel like I can’t just put some octane booster in and forget about it. Why are the main causes for detonation and how do I eliminate it? Thanks again.
77187
 

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Combustion chamber carboned up, too hot of plugs, restricted exhaust, luging the motor at low rpm.
 

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Discussion Starter · #3 ·
Combustion chamber carboned up, too hot of plugs, restricted exhaust, luging the motor at low rpm.
What can I do to fix it? Right now I’m looking at getting a new fuel filter cleaning my injectors and installing axel back exhaust, would this be enough?
 

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What is the reason why you think you're getting detonation?

You can put heet in your gas and see if that makes a difference.
 

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Discussion Starter · #5 ·
What is the reason why you think you're getting detonation?

You can put heet in your gas and see if that makes a difference.
It only happens in first gear full boost, and it sounds like a loud click coming from the motor. I’ve read other threads talking about detonation and they described exactly what I’m experiencing. My car has a stock tune and the injectors are stock, never changed a fuel filter and the kms are high. Never cleaned the injectors. I’m going to get an afr gauge and see if I can figure if it’s lean or rich.
 

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It only happens in first gear full boost, and it sounds like a loud click coming from the motor. I’ve read other threads talking about detonation and they described exactly what I’m experiencing. My car has a stock tune and the injectors are stock, never changed a fuel filter and the kms are high. Never cleaned the injectors. I’m going to get an afr gauge and see if I can figure if it’s lean or rich.
How many miles on the engine? it could be timing chain stretch.
 

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Advenio Pariter
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I would start with a good cleaner like Techron. A cheap first step. You might want to double-up on it. I run a catch can an use a fuel additive regularly. With that many miles are these the original plugs? If so, replace them.
 

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Discussion Starter · #9 ·
I would start with a good cleaner like Techron. A cheap first step. You might want to double-up on it. I run a catch can an use a fuel additive regularly. With that many miles are these the original plugs? If so, replace them.
I booked an appointment with a Hyundai technician for a valve cleaning, I’m going to see if that helps and continue to keep up on the injector cleaner from then on, they aren’t original plugs I changed them around 125,000. Ngk one step colder. What is your catch can setup? Something I’ve been looking into.
 

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Discussion Starter · #10 ·
UPDATE** so I grabbed a big bottle of Lucas octane booster, chucked it in the tank and it’s no longer detonating. Still changing my fuel filter and cleaning my valves as the octane booster is not a forever fix. Also swapping the oem muffler for a 2.5 inch single exit. Hopefully free up some pressure. Going to service my waste gate and make sure it’s working correctly, I have a forge bov, since the car comes with a diverter valve does it really make a difference if the waste gate actually surges? If it doesn’t will it break ****? Thanks
 

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Advenio Pariter
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I booked an appointment with a Hyundai technician for a valve cleaning, I’m going to see if that helps and continue to keep up on the injector cleaner from then on, they aren’t original plugs I changed them around 125,000. Ngk one step colder. What is your catch can setup? Something I’ve been looking into.
I have a Saikou-Michi can on the intake-side and a use a Jegs oil separator on the turbo-side. I posted pics on this years ago. The turbo-side does not catch too much. I run a tube and a valve off the bottom of my Saikou-Michi can so that I can drain it easily with each oil change.

I have had my Veloster N since last July and my Jegs oil separator still looks like new. I think Hyundai put baffles in the valve cover to stop the turbo-side oil pull. I may remove it soon.
 
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