Aston Martin advice from Bamford Rose independent specialist
Discussion
Ex Boy Racer said:
What is the final BHP figure on the V12S with the BR exhaust? I guess it must be well over 600?
Well its 565 allegedly for a V12VS although there is some doubt as to whether its is actually quite that high at the wheel. But the mods I had done are belived to generate circa 70BHP extra so you would expect to be at 600+ maybe as high as 625-635? I am going to put mine on a dyno in near future with BR in attendance. I'll report the results in due course.CraigV12V said:
Well its 565 allegedly for a V12VS although there is some doubt as to whether its is actually quite that high at the wheel. But the mods I had done are belived to generate circa 70BHP extra so you would expect to be at 600+ maybe as high as 625-635? I am going to put mine on a dyno in near future with BR in attendance. I'll report the results in due course.
Do BR have a dyno? if so might get them just to check mine as wellsteveway said:
Do you have V12V or V8V, would be nice to know what you think, although its too late to change my mind but then why would I when its going from 510 to 600bhp 
steveway, I can only say that you will not regret it for one second. I drove around all weekend with a grin and the sound is brilliant. Thanks again to Mike and the lads for a great job. And the good thing about doing this now was that there were signs of deterioration on the Primary Cat's that were replaced. So I feel even better about having the manifolds replaced
klaiberp said:
steveway, I can only say that you will not regret it for one second. I drove around all weekend with a grin and the sound is brilliant.
Thanks again to Mike and the lads for a great job. And the good thing about doing this now was that there were signs of deterioration on the Primary Cat's that were replaced. So I feel even better about having the manifolds replaced
That's good news, did you go for non baffle cats?Thanks again to Mike and the lads for a great job. And the good thing about doing this now was that there were signs of deterioration on the Primary Cat's that were replaced. So I feel even better about having the manifolds replaced
steveway said:
klaiberp said:
I am sure they were the baffled cats as Mike recommends. I left it to their recommendation and in my opinion it does not need anymore noise.
Ok, I am going with the non baffled but mike says they can be changed if I feel they are too noisyFor comparison, one of each
klaiberp said:
And the good thing about doing this now was that there were signs of deterioration on the Primary Cat's that were replaced. So I feel even better about having the manifolds replaced
Indeed, the primary cats showed signs of surface erosion and rolling over of leading face edges of matrix. Both conditions will lead to overheating and eventual failure. There was no explanation as to the cause of why, just like no explanation as to the failure of CraigV12V’s cat and subsequent engine damage. Quite alarming considering only 8kmiles on your car whereas a 450 BHP cat with no misfire looks fresh at 80k. Looking at manifold / catalyst it’s practically the exact same part on a 450 BHP V12 compared to 565 BHP, perhaps the increased gas flow / temps are too much for the brick volume to handle without a damaging exotherm over temp.Good / normal cat matrix:
From your V12VS
The final pic shows cat matrix coming away from edge of mounting can which is the only supportive structure, so all failure modes considered these cats were very close to failure. Tapping cat on floor resulted in some debris drop into primary pipe.
Primary cat failure on other V12 Engines only occurs if there is something out of service (coil / breather circuit resulting in misfire). On V12VS / 565 engines cat failure for whatever reason seems to occur when all components are within service.
MarkM3Evoplus said:
German mag tested a V12VS and put it on a dyno. They stated it had 533bhp at the flywheel, but don't know what the wheel figure was so can't say what conversion factor was used.
Makes sense. Across a number of 565 motors with the old Ford ECU (Vanquish 6 speed) and all subsequent Bosch ECU cars, we’ve not dyno’d a 565 Motor above 545 yet. Our kit is approx 70/80 BHP delta. What baffles me is an AMR or power pack car is 603 BHP, with primary cats fitted??The vehicle certification agency homologation test does perfectly legitimately allow for on the day calculator power, clearly the German dyno just reports what it sees and is absent of such calculations Emilio Largo said:
Mike, do these primary cat failures only occur on V12 engines or is it a (how big?) problem on V8 engines, too?
Cat failure on V8 is extremely rare occurrence, I wouldn’t be concerned about cats failing on V8 unless engine has significant misfire combined with prolonged use in that misfiring state steveway said:
Hi Mike, thanks for the update, lets go for the baffled cats then, don't want it to be over silly.
steve
That is the correct decision, the original Lance was without baffles originally and it was just way too much. The baffled option is perfect, hardly subtle, but not quite ASBO either.steve
klaiberp said:
I drove around all weekend with a grin and the sound is brilliant.
A few pics of the hardware responsible for the grin!The airflow increase across the speed range was similar to CraigV12V’s result but slightly different acceleration times were recorded.
In 4th Gear from 1500 rpm to 7000 rpm (25-113mph) we recorded 12.22 seconds std with modified reducing to 10.92 - a 1.3 second improvement. CraigV12Vs time was 11.4 down to 10.4. But the end result is the same, in Sport mode with exhaust valves loud the drive is Epic!
BamfordMike said:
klaiberp said:
I drove around all weekend with a grin and the sound is brilliant.
A few pics of the hardware responsible for the grin!The airflow increase across the speed range was similar to CraigV12V’s result but slightly different acceleration times were recorded.
In 4th Gear from 1500 rpm to 7000 rpm (25-113mph) we recorded 12.22 seconds std with modified reducing to 10.92 - a 1.3 second improvement. CraigV12Vs time was 11.4 down to 10.4. But the end result is the same, in Sport mode with exhaust valves loud the drive is Epic!
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