EMERALD remap, 89bhp gain!
Discussion
Ok, so the thread title might be a little bit misleading 
Today I had the great pleasure of spending several hours in the charming company of one mr Dave *rave talker* walker ex tech editor of cars and car conversions magazine, at his premises in deepest friendliest Norfolk
Reason for going was to get a mapping session done on a completely standard 4.5 cerbera to find out what sorts of figures we could expect.
First thing was to do the power run on the MBE ECU .. but something wasn't right .. at 4700 rpm the mixture was going waaaaaaaay lean, like as lean as the lambda would read to and then some .. time for a quick shut down .. we thought the sensor had fallen out of the exhaust but it was still there .. curious! .. did another run with the fuel pressure tester in to make sure it wasn't a delivery problem but that showed 3.6bar all the time .. still leaned off, run aborted and a measly 243bhp at the flywheel recorded!
Karl was eagerly beavering upstairs making a conversion loom and modifying the std M3D EU to fire the 75 degree V8 that is the AJP8 .. once done Dave set about mapping the Cerbie.
It's always great to see the power figures climbing as fuel is changed and ignition advance added or taken away .. Dave was very confident he could improve on the pitiful first figure .. and bearing in mind that Dave's rollers read about 10% less than the Noble rollers I regularly use it was great to see the car punch through the 300bhp flywheel figure.
gradual tweaking of advance and mixture netted the end result of 332bhp at 6400 revs and 314lbs.ft at 4900 revs. For a car with nearly 60k miles on it I think that's not bad
All in all a top day out, great to see the acknowledged master at work. I'll try to get the sheet scanned and uploaded onto my website asap.
joo
>>> Edited by joospeed on Thursday 21st October 20:58
Today I had the great pleasure of spending several hours in the charming company of one mr Dave *rave talker* walker ex tech editor of cars and car conversions magazine, at his premises in deepest friendliest Norfolk
Reason for going was to get a mapping session done on a completely standard 4.5 cerbera to find out what sorts of figures we could expect.
First thing was to do the power run on the MBE ECU .. but something wasn't right .. at 4700 rpm the mixture was going waaaaaaaay lean, like as lean as the lambda would read to and then some .. time for a quick shut down .. we thought the sensor had fallen out of the exhaust but it was still there .. curious! .. did another run with the fuel pressure tester in to make sure it wasn't a delivery problem but that showed 3.6bar all the time .. still leaned off, run aborted and a measly 243bhp at the flywheel recorded!
Karl was eagerly beavering upstairs making a conversion loom and modifying the std M3D EU to fire the 75 degree V8 that is the AJP8 .. once done Dave set about mapping the Cerbie.
It's always great to see the power figures climbing as fuel is changed and ignition advance added or taken away .. Dave was very confident he could improve on the pitiful first figure .. and bearing in mind that Dave's rollers read about 10% less than the Noble rollers I regularly use it was great to see the car punch through the 300bhp flywheel figure.
gradual tweaking of advance and mixture netted the end result of 332bhp at 6400 revs and 314lbs.ft at 4900 revs. For a car with nearly 60k miles on it I think that's not bad
All in all a top day out, great to see the acknowledged master at work. I'll try to get the sheet scanned and uploaded onto my website asap.
joo
>>> Edited by joospeed on Thursday 21st October 20:58
. yup I've set up a direct-sales-thru-joospeed for all the cerbera ECUs, the std box with a map from another car of the same spec is 750 plus vat. rolling road set up for your car is 200 plus vat. BUT you get the software nd mapping lead and handy mapping bible so if you want to fiddle yourself you can do (or take it to ur nearest friendly rolling road type personage) and also it's future-proofed in that if you make any mods you just get it remapped for a cuople of hundred pounds (or less if it doesn't need changing much) and you're bang on the power again .. plus Dave Walker is a really really REALLY nice chap
Tatlow said:
How much does it cost and where do I sign, please?!
lol .. not every car gains 89bhp though! .. teehee .. typically you'd be lookng at 10% gains over an otherwise perfect car. it's enough to feel it though, and the driveability gains are tremendous
edited to add .. where the power was dropping at teh top end due to the underfuelling the car picked up 130 bhp!! lmao .. i think the owner might notice that!
>> Edited by joospeed on Thursday 21st October 12:33
jurdy said:
So what would you expect a RR 4.5 to make with the Emerald ECU?
Read an article in sprint some time ago and am thinking of stepping back into Cerbie ownership shortly.
TVR seem to work hard to get the peak torque and power on the red rose, but the emerald gained power almost everywhere else .. goto the emerald website and look at the report and power graph on the red rose remapped there
Mark the owner has just been in to see me .. totally loves it .. had my first drive in the dry just and the performance is what it shoud be .. mid way between a very good std cerbie and the red rose versions .. just doesn't know when to stop!! He's delighted .. also what strikes you is how much smoother the engine is on proper fuelling (not cat friendly obviously) and how good the throttle response is ..
Well you've got to bear in mind that this car was a bit sick .. but plenty of people go for Rover V8 remapping to cure faults and come out with power gains nowhere near as impressive as this .. so we've just done the same thing here but it's been spectacular.
Thing is, the car didn't seem to have any faults, just appeared to be a slightly soft (high mileage remember so nothing untoward with that) cerbera .. and at midrange was producing 280lbs of torque, a figure griff 500 owners wouldn't be too upset about so the car was pretty sprightly, just that now the car is fanbleedingtastic!!
Thing is, the car didn't seem to have any faults, just appeared to be a slightly soft (high mileage remember so nothing untoward with that) cerbera .. and at midrange was producing 280lbs of torque, a figure griff 500 owners wouldn't be too upset about so the car was pretty sprightly, just that now the car is fanbleedingtastic!!
easto said:
Would you say that it is as smooth as a 4.2 and the throttle response is as good?
This coming from the fact that you pitch it between a good cerbera and a RR....
Im sure he is chuffed to bits
smoother than any other cerbie on part throttle .. only bad bit is right down at just above tickover where the air speed may be too low to atomise the fuel on the other side of the butterfly (injector above butterfly on the 4.5 of course) .. but everywhere else it knocks spots of anything ajp8 powered.
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