Why did I over boost? 23 psi!!!
 

BOOM!!! said my motor on Friday night.

This is really disheartning actually. Do all the mods correctly, always make sure that there is enough fuel for the given boost. Yet out of the blue on a cold night I overboost by 13 psi!

Friday night I was taking my friend out to his house. On the on ramp to the freeway I WOT in third (I always do that there). Boost controller set to 10 psi. After the boost kicked and mid way through 3rd my car fell flat on it's face. I knew the car was blown. I cycled to see what my peak boost was and my profecB recorded 22.6 psi! my power FC hit a peak of 17 psi!!! WTF on stock turbos???

I don't get it. :confused:

my mods are
Mild Streetport
CAI
PFS SMIC
DP
MP
RB catback
Greedy boost controller
Power FC
STOCK TURBOS
low boost 10 psi
high boost 12 psi.


I always thought i'd be safe as long as I stay near stock levels with stock turbos. Guess not.

Seriously contemplating LS1 after this one. I've been an owner for almost 9 years and it's my second engine under my belt, and fire that totalled my first FD.

yikes
 

Wastegate failure, vaccum hose issue from your EBC install?

Where you doing any work to the car recently to either of those systems that could have caused it?

I think it's safe to safe something in your EBC system failed.

Two things that can save you next time:

1) Run a aftermarket ECU and program it for a "fuel dump" 2 pounds over your high boost. That way if you do overboost you will bog the engine to a rich choke.

2) Install a pop-off valve and set it to 1-2 pounds over your high boost setting. If you overboost, instant vent to atmosphere that cannot fail.

I'm installing my EBC in a few weeks, and this is the exact thing I'm afraid of! :(

Also, you might want to do a compression check before you consider it blown. 23+ psi is going to blow off any loose vac hoses to the manifold, and if they are off the car is going to run like crap and act blown.

Good luck!

-R4tw

Ouch, makes ya wonder. sorry 2 hear.

sorry to hear.


now join us.

Wow, sorry to hear.
Hope Rotary4tw is right and your engine isn't blown.

Good luck.

Was your wastegate ported? Sorry to hear you lost the engine

Is your wastegate ported?

i wouldnt switch sides over this. you need some fuel upgrades running higher boost. you didnt list upgraded injectors so im assuming your running the stock setup. build a new motor and put some money into everything in that engine bay!

i spent 10 grand over the last winter period with a new motor, all new seals internal and external. went over everthing. its a bit of work having the rotary engine but its pretty cool when you pop your hood absolutely no one knows what they are looking at cause they are used to piston engines.

i guess its easier to have a piston engine but i have much more pride knowing the car is all built right and its got rotors. sorry to hear about your loss. hopefully you figure out what your next move is. good luck

Do it! :icon_tup:

Definitely sounds like one of the wastegate lines got loose and disabled it.

That's really unfortunate. :(

Dave

That sucks. Im about to get a rebuilt streeport, on stock turbos run non. seq. hope that doesnt happen. sorry to hear it

Sad to hear that, Montego. It's been really cold lately around SD, so I've been wary about driving my car out even though I finally got it together and running after a year. My mods are not so disimilar to yours minus the street port and MP, but I was following the same train of thought that as long as I kept it to around 10 psi, I won't have to worry too much.

Stories like yours are so dispiriting when you hear them.

Which onramp were you on when this happened?

sorry to hear that but dont ls1 it my oppion it kills the purpose of having a RX-7 if its not rotary thats what sets it aside form everything else

come back with spinning doritos my friend :) it must be real disheartening to blow a motor like that though. im gonna make sure my ebc is hooked up right to my full non seq turbos.

Damn. that sucks. I was just out beating on my car today. Turbos are loving this cool weather.

FWIW, the LS1 route isn't fool proof either. People have been having issues with the welds on the subframes and other parts.

23psi on stock twins just seems unbelievable. Maybe your boost controller completely malfunctioned.

like someone said above, check ALL of your connectors. chances are the pressure popped off a hose or coupler before it got to your engine.

Worth a shot before you write it off as a loss.

What's wrong with cold weather? The dry and cold weather is the best time to drive this car.

Colder air is denser, typically the car will make more boost in cooler weather. I've seen swings from as high as 16 psi on a cool morning in one part of NJ to 12 psi on a hot track in anothe part of NJ on the same day. This was with my BNRs w/ported wg and leaving my profeb b on the same setting.

Montego, sucks to hear that that happened to you. Sounds like a wastegate line came loose, if I had to guess. If you want to take the motor out and ship it to NJ, I can rebuild it for you for a pretty good price.

daym...sorry to hear Elliot...Stick to the rotor man..dont give up...

Sorry to hear this man!!! FCKN sucks.

Damn....now I'm worried about driving my car to work tomorrow in 19 degree weather.....

Damn, time for a good rebuild :)

OR

Join the LS1 dark side :)

Although colder air is denser, we must remember that this is in San Diego, where frigid temps rarely drop below 50 degrees :D.

Montego, I hope your engine is OK :)

Dont make your RX7 into a MX7!

Some places in SD County were seeing temps in the 20's this weekend! The weather has been nuts here, lately.:lol: