even more power
Discussion
These cerbs just keep getting better and better.
Constant evolution on the rollers means we now target areas that only gain power, relatively simple tweaks are now liberating the true potential of the engines.
Just come back from the rollers :
412bhp flywheel
364lbs torque
324bhp wheels
88bhp roller loss @ 137mph
our best effort yet :)
I love these cars :thumbup:
Constant evolution on the rollers means we now target areas that only gain power, relatively simple tweaks are now liberating the true potential of the engines.
Just come back from the rollers :
412bhp flywheel
364lbs torque
324bhp wheels
88bhp roller loss @ 137mph
our best effort yet :)
I love these cars :thumbup:
neilus said:
I got all excited when I read 412bhp flywheel, then I saw 324bhp wheels 
Does this include inductions mods, or was it just the Emerald?
Neil.
324 @wheels is a great result, especially on what is agreed to be a conservative dyno...but with those driveline losses, taken as a percentage of wheel output, my 4.2 would be kicking out 361
Tam Lin said:
I got all excited when I read 412bhp flywheel, then I saw 324bhp wheels
Does this include inductions mods, or was it just the Emerald?
Neil.
324 @wheels is a great result, especially on what is agreed to be a conservative dyno...but with those driveline losses, taken as a percentage of wheel output, my 4.2 would be kicking out 361
what were your figures sean?
found it, 284hp/294lbs.
so yours is a 360hp car on that basis (4.2s normally have slightly lower roller losses due to the smaller tyre width). that's fairly typical for a strong well maintained std spec car .. i don't see any appreciable gain with remaps on the 4.2s that's why I don't remap them.
i understand mark does a lot of part throttle work though to get the response / driveability better, which to be fair isn't that bad on the 4.2 anyway, so they must be almost like driving a proper car afterwards
so yours is a 360hp car on that basis (4.2s normally have slightly lower roller losses due to the smaller tyre width). that's fairly typical for a strong well maintained std spec car .. i don't see any appreciable gain with remaps on the 4.2s that's why I don't remap them.
i understand mark does a lot of part throttle work though to get the response / driveability better, which to be fair isn't that bad on the 4.2 anyway, so they must be almost like driving a proper car afterwards
kojak said:
Thats brilliant Joo. Dont tell...it was Cliffs car.
nopies, beaten cliff's car .. cliff will no doubt get the mods though in due course. I think we struggled with cliff's because it was slightly down on hp before any mods after the mapping, this car just happens to be quite strong I think. But it's not a GT and it's not a red rose, it's not even got short induction pipes.. just a std T reg cerbie 4.5 with a few tweaks.
joospeed said:IIRC it wasnt standard, the engine had some mods... (nick'll be along to confirm shortly, even if he only confirms that Im wrong
What has been the highest "Standard" Cerb anyones ever seen rollered?
that will still be nick whites 409hp car i think.
it finished yet nick?
)joospeed said:
found it, 284hp/294lbs.
so yours is a 360hp car on that basis (4.2s normally have slightly lower roller losses due to the smaller tyre width)
True, but mine should be close, running 255/40s on 17s. Must say, that surprises me a little, the things must be WAY heavier that 1250 kg
joospeed said:
that's fairly typical for a strong well maintained std spec car
Yep, it WAS well maintained..
joospeed said:
i understand mark does a lot of part throttle work though to get the response / driveability better, which to be fair isn't that bad on the 4.2 anyway, so they must be almost like driving a proper car afterwards
Agreed on that, it may be placebo, but there also feels to be more torque low-mid range.
Now c'mon, what half the Cerb owners want to know, is when do you come up with a Joospeed 4.2 hardware tuning kit?
joospeed said:
I dont think joospeed will come up with a 4.2 kit, but the next company may well do. You'll always struggle with the throttle butterflies .. would need some bespoke inlets so it'd be cheaper to trade up to a 4.5 i would imagine ..
supercharger (where's that man with the green V8S)?
NOX?
In my case, driving lessons?
Tam Lin said:
I got all excited when I read 412bhp flywheel, then I saw 324bhp wheels
Does this include inductions mods, or was it just the Emerald?
Neil.
324 @wheels is a great result, especially on what is agreed to be a conservative dyno...but with those driveline losses, taken as a percentage of wheel output, my 4.2 would be kicking out 361
Sean,
It was a bit of a tongue in cheek comment, as I got my car back from Joolz a couple of weeks ago and it was putting 325 @wheels.
Neil.
joospeed said:
What has been the highest "Standard" Cerb anyones ever seen rollered?
that will still be nick whites 409hp car i think.
it finished yet nick?
In short Joolz...no. Promised by the weekend. Had a few delays on parts, but thats another story.
Actually, regarding 'standard', I was hoping to get clarification in writing before saying anything, which I havent yet, but what the hell...Cant give you full info as yet, but in short my car's original owner is a well known car collector and very wealthy American friend of Peter Wheelers, who made him a 'special' car. (he also owns Griff LE 99/100)
When Austec took the engine out/apart they noticed the engine number had 'GT' stamped before the numbers and the pistons/cylinders (I think) are bigger than normal. This goes some way to explaining the larger power and torque figures.
As soon as I get it all confirmed I shall divulge all
PS Joolz, congrats on your recent power figures (412?), good work fella
the rolling losses are load and road speed related ..
typically griffs/chims even with wide rubber don't proiduce this kind of loss figure .. 50bhp maybe?
but a griff chim is lighter by some 150kg or more, and also their power is all over way before a cerbera which typically will be generating another 30-40mph roller speed before the run ends. that takes a lot more power to generate as the losses increased dramatically at high speeds.
as i've said before, the best way to reduce losses is run in a lower gear.
typically griffs/chims even with wide rubber don't proiduce this kind of loss figure .. 50bhp maybe?
but a griff chim is lighter by some 150kg or more, and also their power is all over way before a cerbera which typically will be generating another 30-40mph roller speed before the run ends. that takes a lot more power to generate as the losses increased dramatically at high speeds.
as i've said before, the best way to reduce losses is run in a lower gear.
Gassing Station | Cerbera | Top of Page | What's New | My Stuff