On this post I will put the passages in the dyno for each step of my transformation (my engine power ), from origin to now (which I think will evolve yet).

The goal is to share my research on parts installed on my car with explanatory comments on each power curve.

I hope this post will be of interest to owners of Aston Martin Vantage.

The power announced by Aston (Vantage, 2008, 4.3L):
283 kW or 380 bhp or 385 HP at 7,000 t/m
410 Nm at 5,000 t/m

 

1) Passage to dyno right after purchase, so completely original



253 kW or 345 HP at 7,270 t/m
378 Nm at 4,440 t/m

Very surprised and disappointed, by cons, it was really hot (over 34 °, not very good for performance).
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2) Catalysts 200 cells (RSC)



276 kW or 376 HP at 7,150 t/m (gain 31 HP)
416 Nm at 5,160 t/m (gain 38 NM)

It was a little less hot (28 °)

It's a very good performance for me. I'm happy with the result. The motor mounts better in the tachometer and the exhaust sound is magnificent.
The car looks more "free" . The change feeling really.

To see the difference, I put both the graphics on each other:


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3) freer air filters (bmc) (RSC)



276 kW or 376 HP at 7,260 t/m (gain 31 HP)
399 Nm at 5,180 t/m (gain 21 NM)

Surprisingly, no change of power, but a slight loss of torque.
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4) Manifolds, air boxes and modified sports catalysts (Bamford Rose)




292 kW or 397 HP at 7,550 t/m (gain 52 HP)
423 Nm at 5,150 t/m (gain 45 NM)

The engine is released and it is best expressed in t / m. the noise is really fabulous. The car runs much better at all speeds.

the dyno is quite old and several specialist explained me that this dyno not take into account all the parameters (ISO), I remade the same passage with a dyno last generation (superflow).



304 kW or 413 HP at 7,100 t/m (gain 68 HP)
444 Nm at 5,500 t/m (gain 66 NM)

difference in accuracy between the two dynos: ~4% or 5%


To be continued...

 

We really do appreciate seeing the numbers. Thank you for sharing this, it's invaluable particularly given all that you have done to your car. I'm trying to understand the first chart though. Is this stock with 200 kW at the wheels and 253 estimated at the crank? Or is this before and after some modification with 200 at the wheels and 253 at the wheels following modification?

What kind of Dyno were you using?

200 kW (~272 hp) does seem very low. Was proper correction ofr parasitic losses and climate conditions performed?

 

the dyno is a Bosch 206 fla. It is true that this dyno is ancient, but calibrated every year. You're right for the figures, ie 200 KW at the wheels / 253 kW at the crank. My Vantage gray 2006 had even less power (330 HP at the wheels / 270HP at the crank)

According to the technician who took care of my car, a high temperature may affect the accuracy of around 5-8% on the dyno.

 

Update ;o)

 

Hey Vince, love the way your Aston is coming alone. Didn't you also have the 4.3 to 4.7 conversion done? If so, do you have the dyno from that?
Rob

 

Thank you Rob,
I did the conversion, you can watch on the post "https://www.6speedonline.com/forums/...ite-toy-7.html" The power curve was made by Rose Bamford on my car to valid the transformation. I'll repeat myself passing on a dyno soon.

 

Okay thanks. Of course I have been following your project from the beginning. Nice to see a dyno with the 200 cell catz only.

 

Great write up. Thank you for the info and taking the time to post it all.