Saturday, January 21, 2006 - 12:31 am, by: Adam Underwood(Adam_underwood)
Well I have already put the bell mouths in the air box made the top cover (not on yet) and blocked off most the places the air can escape, so I will do the front option today and I can change it later if I need to. However, I have a very noticeable power difference already (not to mention a much beefier tone) with just the bell mouths and that is breathing in hot engine bay air so I’m looking forward to completing the job.
Thursday, January 26, 2006 - 01:48 am, by: Stephen J Coff(Coffee)
Guys, I have noticed the whole BFI thing did really get taken well. By this i mean, every forum you look at has some threads about these BFI mods. I find the idea a very cheap investment that anyone can do, though i see to much restriction around the head light to get fresh air in freely. I kept the same idea and principal though applied it slightly differently. Firstly i removed the plastic pipe from the AFM to the throttle and replaced it with some mandrel bent exhaust pipe and tapped in some fittings for the vacume lines. From here i made up a small adapter in fibreglass from the intake side of the AFM to adapt 80mm PVC pipe. The pipe runs forward and under the headlight, i have heated it up and flattened it out to pass under the light. Now she drops down and a 90 deg bend with enough straight to fit the pod filter. The pod filter runs forward into the inlet vent on the lower left corner of the front bar, had to notch out the back (inner/ engine bay side) of the bar a little.
Whilst i haven't place it on a dyno to know the exact differences, she pick up slightly on the take off though a noticed difference in mid to top end push. The great thing about the pod filters is you simply hose them clean when your at the car wash. Supriseingly, it can be wet a fair bit before it's very obvious though if you were driving in rain and large puddles this could be a problem ?
Nothing bets forced cold air. You say Toyotas don't suck ?
I have the exhaust done on my car, 2.5" from cats to resonater and then 2x 2.25" to 1x pair of mufflers and all mandrel bent. She sings a nice tune, though when the throttle opens under load the car sound like a formula one car. When she hit the rev limiter she barks louder than my rotti.
My input is, if you want cold air and heaps of it? Go straight to it and grab it! I feel this way gives a direct path for the air and gets it at it's coldest. I used 80mm though someone else i spoke to ? maybe zuffen ? had a forbee and had done a similar thing using 100mm and claimed 80mm to small ? Bigger isn't always better ! Sizing airways is like using the spray nozel on the garden hose. You start with mist then progress to a squirting stream then backs off to running water.
To much restriction and you have nothing. A little restriction creates pressure and thus the squirt. No restriction equals max volume and no pressure, thus slow flow rate.
Regards
Stephen
Peter Scott Tinkerer South Australia UZZ32 Active V8
Thursday, January 26, 2006 - 08:00 am, by: Peter Scott(Planetsoarercom)
hmmm. A garden hose has a lower flowrate with a restrictive squirter on the end of it. This can be tried at home with a bucket and a stopwatch. The high pressure squirt will fill the bucket up slower than if you take the nozzle off and let the water flow. With a garden hose pressure at the tap can be traded for flowrate. You have a choice of a small amount of water with high velocity, or a large amount of water with low velocity.
It would be very difficult to outflow the rear of standard V8 airbox with it's beautiful transition to the afm.
Squeezing any pipe under the headlight reduces cross-sectional area and reduces flow. The BFI 3 allows maximum cross-sectional area and also allows flow from the area to the side of the under headlight (under indicator). There is no way to get less restriction or more airflow to a BFI 3 unless metal is cut. Introducing any pipe reduces the flow rate. The BFI 3 supplies an excess of air the the airbox at all times - this has been measured.
A BFI3 and standard intake resonator and AFM will support 180 rwkW on the V8.
Hosing clean a pod filter at the car wash can damage the filter medium and introduce dirt. It is not recommended to squirt a pod or blow it with compressed air.
There are 4 mechanisms at work in the BFI 3 to reduce water ingress. The intake reservoir under the licence plate,the lip under the headlight chamber, the lip into the airbox and finally the lip across the filter and drain holes in the airbox.
Friday, January 27, 2006 - 09:40 am, by: Michael Keen(Jzz30man)
Peter, thanks for the advice. Couldn't agree more. The BFI test have been done to prove the BFI flows better than inserted pipes and the logic seems very sound to me.