last night i was going down the highway at 150,the engine was hesitating every 10 seconds or so.i pulled off the highway and i had smoke coming from below the throttlebody,anyone ever heard of this

 

You were going so fast you traveled time.....welcome back.

 

ok

 

just a guess, fuel cut??? top speed (according to Mazda is 156)...

 

clogged cat maybe?

 

Assuming you're not making those numbers up, I'd first consider fuel cut. The cat is possible, but it's not often that exhaust restrictions cause a 'bump'ing response.

Where were you to be going that speed?

 

those numbers are correct,ill feep the fuel cut in mind

 

i thought 150 for an fd was nothing

 

i25 colorado.300am.just went sequential and was testing

 

you just went sequential?

 

150 is easily within the capability of a stock well maintained FD. Fuel cut should only occur from an abnormal event (over boost), which I have never seen running at those speeds. The car (at least US version) does not have a speed limiter.

 

is there something wrong with that?

 

he probably had a single turbo before and decided to upgrade to sequential twins

 

I saw 170 with only minor mods (dp cb) with no problems.

 

the car stays at 12 until i let off the gas

 

The car came factory with sequential twins.

 

If you still have the stock ecu, there's your problem. I'm surprised you aren't experiencing it in 3rd-4th gear.

Nothing wrong with going (back to) sequential!

 

white87fc......keep on playing catch up to the fd

 

Hehe, I-25 is were I did my 196 mph run on my bike. Southbound between Denver and the Springs. Oh, and to you non believers that was GPS indicated by the way.

Fuel cut is my guess, you still running the stock ecu?

 

still stock ecu ,just got home from iraq.thats the next mod

 

I saw Delaware in your profile location and knew that would be tough, even in Sussex county.

12psi will produce fuel cut on the stock ecu. Not much margin left, and the fuel cut defense won't work if it appears as a quick enough spike. I suggest you install manual boost controllers or adjust the pills to bring it down a psi or two, or put in a reprogrammed or programmable ECU and get it tuned.

Dave

 

ill turn my boost controllers down a bit....thanks

 

I second that, except replace the dp with a mp and add a power fc. (dont ask why about the midpipe and not a downpipe)

 

so with my car (midpipe,downpipe,catback all 3", power FC, K&N filters) I can see 170 mph ?

 

My car, non-sequential at 11psi, would surge at high speeds. I guess you could explain it like a gentle bucking. Just a thought
However, if you are sequential kindly disregard this post..., and the gentle bucking I mentioned above took place last night on the coffee table with my girlfriend.