So I had my turbo vert out last night it has 3in exhaust, streetport, apexi neo, greddy boost controller and that's about it. I was just driving and was hitting 9.2lbs with the a/f right at 12.0. It only has 4200 miles on it and I had it so rich that when the secondaries kicked in it boged a little so I leaned the apexi out just a couple and went again. That's when it felt like a intercooler pipe blew off so I pulled over and looked but nothing. I started it back up and it sounds like its on 1 rotor and won't even go anywhere. My question is what could have caused this? Detonation? This really sucks though thanks

 

Sorry to hear that I have been in your situation many times.
My question to you is did you tune your Apexi Neo on the dyno with a wideband?
If not than that’s one of your problems and you have to accept the consequences which is a blown motor. Sorry to be blunt, but it’s the truth. Also IMO I would never tune an AFC while driving on the street. Do you know what you’re doing as far as tuning the Fuel computer is concerned? You won’t know what happened until you open up the motor. If I were you I would sell that AFC and get a real aftermarket EMS. To me the AFC is more of a band aid than a real tuning aid. In other words its good, but up to a certain point.

 

I have a aem Wideband in my car and no I didn't tune on a dyno. Why can you not tune on the street? It does suck as it only had about 4200 miles on it and I just got my new clutch and rebuilt tranny put in.

 

I think tuning on the street is actually better being that you are actually putting the car in a real world scenario other that a controlled enviroment. The load value changes after you get off the dyno.

 

So what could have been the cause? Most likely detonation? I was running a 12.0 a/f at 9.5lbs when it popped. I guess I will find out when it gets torn apart.

 

Thats probably too lean for your setup, there are a lot of factors that affect how lean you can run an engine, for example timing, intake temp, coolant and oil temp etc. Probably just detonated.

 

Worst case scenario: probably leaned it out too much, spiked and detonated.

Have you done a compression check yet?

 

No I haven't but I had it so rich that when the secondaries kicked in it would bog a little and so I leaned it just a couple and that is when it was at 12.0 and it popped.

 

but was is 12:1 at 3500 all the way to redline? did it fluctuate throughout the powerband to the point that it MAYBE leaned out too much and detonated? Where you mashing on it and you simultaneously adjusted the NEO to 12:1 and THEN it blew?

What were you using to log the AFRs? I know you couldn't have been staring at the wideband the whole time you were mashing on it.

What exactly did you do? Don't say you leaned it out to 12 because You already said that. I am not familiar with the NEO but I assume it's like the older versions where you adjust the flow rate % by 500RPM intervals (which is why you're supposed to log the info and THEN tune the injectors according to the data unless you have the wideband plugged into your laptop and your passenger is tuning the Fuel according to the readings of the wideband).

more details!

 

It would fluctuate from 11.8 to 12.1. No i was not mashing on it and adjusting. I would go and it was hitting like 13 at first. I let off right away and richened it up from 4000 all the way to 8000. I was out for probly an hour tuning like this but never stayed on it when it went that lean and never adjusted while on the gas at all. I was hitting a consistent 9.2-9.5lbs on my greedy profec spec 2.

 

wait, so you weren't at full boost when you were tuning, right?

But you BLEW the motor at full boost (WOT)? or while you were partially on the throttle?

you really should invest in some sort of logging equiptment so you can see what happened at what RPM and at what thottle % and what boost.

Were you adjusting it at 10% intervals? 5% intervals? 2% intervals?

 

I was at wot when it blew but that was my boost and a/f. I was adjusting in 2% intervals. What can you get other than a stand alone to log? The next one im going to let the builder tune.

 

what wideband do you have?