Disappointing performance!
Discussion
Hi new member here, I'm a bit green,just bought my 1st Cerbera a 96 4.2.was told they had 360-380bhp and 180mph. a sun diagnostic however says 342bhp andmax speed 147 mph, any ideas why these figures might be low? Or are they just a very overrated car? It has done 33,000 miles and the service history is up to date. It's on 18 inch rims with 255x35 tyres. Was well disappointed when I saw the diagnostics sheet, nearly as fast as my Megane!
crazycats said:
342 sounds pretty reasonable, only 18 off the quoted figure is OK when you consider that some 4.5's are 30-40 lower than it says on the tin.
However 147 is way off, somethings not right there, was that the figure from the dyno??
I agree with that. 342 is about correct. The 147 is low. Should be another 20-30. As for the megane...must be a bloody quick one.
_DJ_ said:
147 - perhaps it was rolling roaded in fourth?
Agree with that too, my speedo has shown an estimated 150mph in 4th on a track day.
347bhp, if that's at the wheels then it's very good for a 4.2. If it's flywheel bhp then it's about the norm, the AJP V8 is hardly a churned out identical production line engine.
sounds a fab figure to me .. what was the torque though? ..
147, yup that'd be the roller speed at which max power figure was generated, not the rtue max speed of the car which will be somewhere around 170 ish ..
you've got a good one there!!!
>> Edited by joospeed on Saturday 28th February 01:47
147, yup that'd be the roller speed at which max power figure was generated, not the rtue max speed of the car which will be somewhere around 170 ish ..
you've got a good one there!!! >> Edited by joospeed on Saturday 28th February 01:47
froggie said:
Hi new member here, I'm a bit green,just bought my 1st Cerbera a 96 4.2.was told they had 360-380bhp and 180mph. a sun diagnostic however says 342bhp andmax speed 147 mph, any ideas why these figures might be low? Or are they just a very overrated car? It has done 33,000 miles and the service history is up to date. It's on 18 inch rims with 255x35 tyres. Was well disappointed when I saw the diagnostics sheet, nearly as fast as my Megane!
The stated bhp for 96 Cerbera 4.2 are 350 so it appears quite accurate. 147mph is shameful since Mercedes can do 155mph. The Cerbera is meant to kill a Porsche easily.
It is said that 4.5's REAL bhp are also over stated and in reality are 310-380.
Whatever the case, although I personally haven't risked the fastest 0-60 but it certainly appeared on my previous 4.2 and current 4.5 that the specs can be reproduced.
munir said:
froggie said:
Hi new member here, I'm a bit green,just bought my 1st Cerbera a 96 4.2.was told they had 360-380bhp and 180mph. a sun diagnostic however says 342bhp andmax speed 147 mph, any ideas why these figures might be low? Or are they just a very overrated car? It has done 33,000 miles and the service history is up to date. It's on 18 inch rims with 255x35 tyres. Was well disappointed when I saw the diagnostics sheet, nearly as fast as my Megane!
The stated bhp for 96 Cerbera 4.2 are 350 so it appears quite accurate. 147mph is shameful since Mercedes can do 155mph. The Cerbera is meant to kill a Porsche easily.
It is said that 4.5's REAL bhp are also over stated and in reality are 310-380.
Whatever the case, although I personally haven't risked the fastest 0-60 but it certainly appeared on my previous 4.2 and current 4.5 that the specs can be reproduced.
The speed is a red herring! Consider this:
a) In 5th, how many revs do you use to do 70mph? Is it less than half the revs where max power is produced? If so, your top speed could not be 140ish
b) How would the rolling road calculate top speed - it doesn't know about the aerodynamics of the car, weight etc.
Darren.
>> Edited by _DJ_ on Saturday 28th February 14:58
froggie said:
Was well disappointed when I saw the diagnostics sheet, nearly as fast as my Megane!
All this means is that when the megane was tested, it was in a gear where max power is generated at a wheel speed of about 140, my Chevy van can do that and more. Max power at 4300, 38mph per 1000, blimey it must do 160 at least
The Cerbie actually can pull to max power in 5th when aerodynamic drag in factored in as well, that's why they obliterate pretty much anything in a straight line. I have seen 145 ish at Castle Combe still in 4th and still pulling. gbbird said:
I remember seeing something on a Cerbie site a long time ago where a 4.5 hit 200mph in Germany/France somewhere, and it had a piccie of the Speedo to prove it 
>> Edited by gbbird on Sunday 29th February 14:38
Not 200 but fast enough!!
Not mine i hasten to add
>> Edited by davetherave1970 on Sunday 29th February 19:48
>> Edited by davetherave1970 on Sunday 29th February 19:49
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