On my way to work I did a hyw pull up to 150 mph afther that
My car started to shake like I blew my motor up but once I shut her down I started hEr back up and she seem fine WTF

 

nice.

 

i can only think the car is leaning out up top , your getting more air flow , your exhaust is opened up so its flowing better so now you need to more fuel . i would relax on the top end runs until you Tune the car

 

I knOw but at 4am its hard not to push this *****

 

I never push my car past 3rd gear going wot.melting cylinder 8 comes to mind every time lol

 

Could bigger injectors be in order?

 

It wont melt at those speeds
He most likely has a leak of some sorts. Check TB, and all your gaskets for leaks

 

But you left out one important variable, "Catch Em" your friendly neighborhood state trooper, at that speed your going to jail. Those speeds should only be done on the track. You were flirting with disaster my friend. I'm still a little shell shocked about doing 97 mph in a 55 last September and going to court, and facing $2500 fine, 1 yr suspension and 7 days in jail. Luckily, I had a good lawyer. Paid $150 fine, $82 court fee, and 5 points. I learned my lesson.

 

Any chance you just bumped up againt the factory top speed limiter???

I don't know how the factory actually cuts power (cut spark, remove timing, removes fuel or some combination).... but I'd imagine no matter how they do it, it's going to cause a pretty noticeable stumble once you get there.


-G

 

Did the shaking continue until you stopped and turned the car off or did the car go back to normal as soon as you let off?

 

Yeah As soon as I shut her down and stared back up
She was finE

 

These cars are freak shows sometimes. Happens to me all the time. Hard pull up to 3rd and then at a redlight, the car feels like its a pro stock car idling.

I have cams and stuff but still! Weird.

 

ive bounced off the speed limiter a few times in several models MBs and it just gave u a dead pedal until your MPhs drop down again , no bogging or stumbling from what i remember

 

That makes sense... I'm guessing now that the MB is "drive by wire" throttle, so it would be a lot simpler to just ignore the extra throttle input to hold the speed steady at the factory limit.

Those other techniques I listed are better suited for the mechanical linkage-type vehicles.


-G

 

+1
I have pushed my car to 150mph+ speeds on wide open roads as well (wont say where) but I feel lucky not to have been caught.
It really is playing with fire when you are in the 90-100mph range.
Im not planing on doing that again unless im on a track.

 

I just checked it out with a scanner cly number 8 mis fired
Why maybe it went real lean

 

I'm lucky, I have a 1 mile flat private road just by my house that goes into a state park and closes at dusk. It's exactly 1 mile long, 2 lanes and empty of any traffic.

I do half mile blasts on it all the time, late in the evening 10PM - 11PM or so and have a half mile to slow the beast down.

Once I get my headers installed I'll do this again. Hoping to hit 150 MPH! I'll film it as well so you'll have proof.

But again this is basically a closed road after dark with no cross traffic, cross streets.

I lub it. (hehe...)

Alex

 

Pull your spark plug and look for oil.might as well do a compression check on that cylinder while your there.

I hope its nothing but your car shut down the cylinder and went into limp mode.

 

I am gonna check it now see if there's oil there

 

I tired to take off the spark plug but I coulnt get my driver in there the socket
Was to fat plus the yesterday when my friend asked me to rev my car so he can hear it with the hood open I heard a lifter hit once it sounded like it hit the
Valve cover but it I haven't heard it again

 

I go 150+ once a week or more on public roads, waaaay out in the middle of nowhere. Let the preaching begin. Solid as it gets at those speeds.

 

+1 ... This car is truly uneventful at those speeds.

 

My sentiments exactly. My car is stock but 150 mph is merely 13 seconds of WOT from 100 mph...no big deal...
Brgds

 

do these cars having issues cooling at WOT runs at those speeds. That was a HUGE issue on the 03/04 Cobra and many killed their motors that way. A couple comanies came out with head cooling mods that evened out the coolant accross the motor. I did a 155 mph pull the day I bought mine and it felt solid as a rock. Anyone else have more info or a link about cylinder #8 going lean and how to reduce that chances of this happening? I am going with a stage 2 package from eurotune next month and wonder if the fatter tune will help with the new pulley. thanks!