Beams velocity stack length tuning

[Tim.duncan]

Latest developments

[Frak]

Nice

[Sam-Q]

there you go Frak, something to have fun with next time on the dyno.

I really want to see how these fare against the others.

[Frak]

Sam, we'll run it up this Wednesday, will be interesting to see.

[Grant #2]

Here's a question:

Does anyone know why the intake tract is so long on FA engines? Being such a peaky engine, I would think that the intake tract should be short to cater for the high RPM, yet I see this:



I have theories but I don't know for sure.

Also, as far as the Blacktop OEM trumpets choking things off on the Beams....would this maybe not be as much of an issue on a stock blacktop engine that isn't flowing nearly as much? As in, it might benefit from the mid-range gains but maybe not reach a choking point until a really high rpm?

[plohl]

I would have though it would be to make the most of the engine over the whole rev range. If the engine is set up to produce most torque at a high RPM, the gains for tuning the exhaust and intake system would be very small, whereas increasing mid range torque would offer far better gains and produce a more 'drivable' car.

[Sam-Q]

That isn't the case. In real world test on a 4AGE engine it seems you can get the harmonic theories and throw them in the bin. I don't have the most experience however I have yet to see any case where someone has lost power anywhere in the rev range by running longer intakes. I supplied a customer with the same 110mm trumpets as what I have here, he also by coincidence previously ran the same B/T T3 trumpets previously. In his case he picked up good mid to top end power, also apparently they made a shitload of noise. He had a 20V though and so this is one of the reasons why I am so intereted in the results of this dyno run.

[plohl]

Do you mean top end power???

[Sam-Q]

yes indeed your right, I will edit

[Sam-Q]

I have also moved this to the technical section, seems more appropriate