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Discussion Starter · #1 ·
So today a friend and I went to do some real world speed/ acceleration testing on my car. He has access to some closed airport runways and allowed me to do some speed testing on my car before I install my PPC. I plan to post results after I install.

All tests were conducted using his Escort G-Timer ( I don't know how accurate it is, but I figured better than a stopwatch!)

The only thing that surprised me was the maximum speed. I didn't think there was a speed governor on the 9-3SS. However, at a speedometer indicated 135 mph (about 130 on the G-Timer), the boost was reduced and the car just barely held speed. I assume this is for the tires? If you have the sport package installed from the factory, is this constraint removed? I would assume that the Aero/ Vector at least does not have a governor.

It's not a drastic concern, or even, actually an issue. Just wondering does anyone know if the BSR PPC circumvents this? Just interested.

TIA
 

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The boost is lowered in the Aero/Vector/Arc at around 143mph (230) km/h as stated in the manual i believe. Even with my PPC the boost limiter is still there I wonder how it can be removed?:roll:
 

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I don't know about a speed governor.
There is supposedly a rev limiter which cuts in at 6275 rpm.

Those with the BSR PPC have said there are no changes to the rev limiter.
 

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Discussion Starter · #5 ·
Well, I know for sure that I am not hitting the rev limiter!

I guess I will have an answer to all of you in about a week.
 

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Well ... for what it's worth, Hirsch specifically states that they are limiting top speed in the 252hp version of Aero tune (not specified in other tune versions). To me, the implication would be that there isn't an actual speed limiter in place otherwise ... but who knows? Dr. Boost, you out there anywhere??? Sure you got the answer ...
 

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My guess is that you have hit the fuel regulator limit. The fuel pump may not be able to maintain high fuel pressure at that kind of boost and rpm. The injectors can probably keep up. The same happened to someone I know but his was a 95 Aero with Hirsch upgrade. Stage 3 I think. After he replaced the fuel regulator and fuel pump he was able to surpass what felt like a limiter before.
 

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I also noticed this, but it was not at 135 mph it was at 110. It feels like the turbo shuts off and the rpm's wont raise. The thing is, is that it flies up to 110, but then trying to go higher it raises very slowly to 115 (I slowed down after that because I am not going to be going that fast on a highway for an extended period of time). I am in an arc so it should be plenty fast and my previous car could hit 110 a lot easier and that was a volvo s40. Any clues?
 

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06 Aero - limited to 135 mph - electronically controlled/limited - the only conceivable way to get around it would be to install an appropriate European ecu - not easy - they are limited to 156mph or 165mph - can't recall - BSR tune won't remove

05 and before 9-3ss limited to 148mph

Pretty smooth at 135mph (I bet).
 

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Try some searches for "max speed" and "tire speed rating."
The rumor a few months back was the speed limit built into the ECU has more to do with stock tires than the engine.
 

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ANTMAR said:
06 Aero - limited to 135 mph - electronically controlled/limited - the only conceivable way to get around it would be to install an appropriate European ecu - not easy - they are limited to 156mph or 165mph - can't recall - BSR tune won't remove

05 and before 9-3ss limited to 148mph

Pretty smooth at 135mph (I bet).
Will they not remove it for liability reasons or because they can't?:roll:
 

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fishhyren11 said:
Will they not remove it for liability reasons or because they can't?:roll:
There has been a lot of discussion about this.
AFAIK no one can do it without replacing the ECM. And that's only theory.

So it seems to be impossible to change this even if you had a valid reason.
 

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i have an 06 aero i am going to try a company callled powerchip that i found when i was at SEMA this year they can tune the motronic ecm AND take off or raise the speed limiter.
i was going to send it out to them this week but i decided i want a before and after dyno because noone on here has dynoed one of these cars as far as i know and i want to see of their horsepower claims are validated. 285 hp 288 tq is what they claim. i also want to make sure the A/F stays good the whole way through ive heard some nasty things about other companies tunes for the 06 aero going lean in the higher gears.
 

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ANTMAR said:
06 Aero - limited to 135 mph - electronically controlled/limited - the only conceivable way to get around it would be to install an appropriate European ecu - not easy - they are limited to 156mph or 165mph - can't recall - BSR tune won't remove

05 and before 9-3ss limited to 148mph

Pretty smooth at 135mph (I bet).
For some reason my 03 Vector has "developed" a limiter over the years.

Not that im mad, but my car is now somehow limited at 135:roll: . It just wont go no matter what i do after that.
 

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So there is no clue as to why mine will only go 110 while pushing? Could it be because I set the dash screen to beep at 100 for the speed warning that it stops accelerating rapidly at 110? I tried again today and it had the same effect, does anyone else noticed diminished acceleration at those numbers? I am glad I have an 05 now though with the 148mph limit instead of the 135!! that is if my car ever wants to go that fast.

edit: could turning off tp help as maybe the traction control slows it down at that speed due to the tires not getting adequate grip at high speed?
 

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pyrex said:
So there is no clue as to why mine will only go 110 while pushing? Could it be because I set the dash screen to beep at 100 for the speed warning that it stops accelerating rapidly at 110? I tried again today and it had the same effect, does anyone else noticed diminished acceleration at those numbers? I am glad I have an 05 now though with the 148mph limit instead of the 135!! that is if my car ever wants to go that fast.

edit: could turning off tp help as maybe the traction control slows it down at that speed due to the tires not getting adequate grip at high speed?
I really dont think that would be related, and i would highly advise not turning off ESP especially at those speeds.
 

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I've hit the 135 MPH limit in my 2007, car rides fine at that speed and is still pretty quiet too. The limit (as others have said) is electronically controlled, but that speed is only for the US and Canada. I think in Europe it is limited to 155 MPH (250 km/h) since it is possible to exceed 135 MPH (220 km/h) on the German Autobahn.
 

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DuSpinnst said:
I think in Europe it is limited to 155 MPH (250 km/h) since it is possible to exceed 135 MPH (220 km/h) on the German Autobahn.
Look around the Workshop. The speed limiter settings apparently changed when they started shipping 93's with different tires. The wording in the manuals also changed. Someone had a nice thread giving the details, and it makes sense.
 
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