| Author |
Message |
Cristian Gruber
Tinkerer
VIC
UZZ31 SC400
Posts: 44
Reg: 07-2005
|
Just want to do a cold air intake for my UZZ31. I found all these articles on this site as well as on the old ALSC site and reepa.com but Im starting to get confused.
Saw a couple with all these 'trumpets' style intakes on reepa as well.
Which one do you guys have? |
Peter Ha
TryHard
NSW
Soarer TT
Posts: 344
Reg: 07-2005
|
do you have the links for the cold air intake? it sounds very interesting. |
David Vaughan
DieHard
ACT
Soarer GT-L (4.0 V8) Lexus is300 (3.0 VVT-i 6)
Posts: 588
Reg: 07-2005
|
BFI 3. Just do it. |
David Vaughan
DieHard
ACT
Soarer GT-L (4.0 V8) Lexus is300 (3.0 VVT-i 6)
Posts: 589
Reg: 07-2005
|
The trumpets you talk about are presumably the egg cups in BFI 3.
What is the confusion? We can give you multiple build methods and materials, data on performance effects and opinions on the aesthetics.
Ask the question and we can help. |
Peter Ha
TryHard
NSW
Soarer TT
Posts: 345
Reg: 07-2005
|
done bfi 3... thought there would be something else better than bfi 3. |
David Vaughan
DieHard
ACT
Soarer GT-L (4.0 V8) Lexus is300 (3.0 VVT-i 6)
Posts: 591
Reg: 07-2005
|
In what respect? Do you feel it does not work? If you have positive intake pressure, which BFI 3 provides, your further issues should be with the engine and exhaust rather than a new intake.
Incidentally, your profile pic shows a pod rather than a BFI. Hope your engine innards are not too dusty. |
Don Bagnall
Moderator
New Zealand
GT4.0 V8
Posts: 1256
Reg: 05-2005
|
BFI 4..............The revenge of the bugs? |
Dave Hart
Tinkerer
Not Australia
UZZ32
Posts: 39
Reg: 08-2005
|
Having a BFI will, depending on relative air speed, ram more O2 into the engine which will, no doubt, enable a wider throttle opening. With the price of fuel no thanks, I'll just stay steady as she goes until OPEC releases more crude. |
Cristian Gruber
Tinkerer
VIC
UZZ31 SC400
Posts: 45
Reg: 07-2005
|
Looks like everybody has misunderstood the purpose of this post.
I just want to know what type of cold air induction everyone is using. Stock filter? POD? BFI? etc. |
Peter Ha
TryHard
NSW
Soarer TT
Posts: 346
Reg: 07-2005
|
well basically, i had BFI 3. i felt a difference in power, but basically for the sound, i expected more in sound.. like a nice moderate chutter noise as the pod filters but still get noise from BFI 3 which is good.
i wonder what BFI 4 would be.... |
David Vaughan
DieHard
ACT
Soarer GT-L (4.0 V8) Lexus is300 (3.0 VVT-i 6)
Posts: 595
Reg: 07-2005
|
If the engine has positive intake pressure rather than sucking frantically, your throttle opening for given performance should be very slightly reduced, so you will use less fuel. A BFI is thus more economical, not less. As with other passive breathing improvements, you use more fuel only when you feel encouraged to exploit the extra available performance; which happens. |
Peter Nitschke
JunkFilterer
South Australia
GT4.0 V8
Posts: 2182
Reg: 11-2004
|
Except the ECU matches the amount of fuel to the amount of air going in, so it shouldn't use any more or less fuel. The only difference would be once you go beyond the ability of the OEM system to supply air, ie at WOT or thereabouts. |
Dave Hart
Tinkerer
Not Australia
UZZ32
Posts: 41
Reg: 08-2005
|
anyone got any figures for fuel savings b4 & after fitting a BFI? |
Peter Ha
TryHard
NSW
Soarer TT
Posts: 347
Reg: 07-2005
|
Sorry for hijacking Christian.. well i had obviously BFI 3 and now i've got a pod filter.( damaged one)..  |
Morgan Cross
DieHard
Victoria
Soarer TT
Posts: 518
Reg: 07-2005
|
Peter, make sure you enclose your pod, and make a scoop to get heaps of COLD air to it, you will be worse off if you add a pod and it just sucks up hot air from your engine bay  |
Benny Gammelmark
Goo Roo
NSW
V8 UZZ31
Posts: 1013
Reg: 07-2005
|
Christian, I use BFI 3 with standard Toyota filter as it's the best. Just remember to change filter every 10K.
There's not reason to use money on an expensive pod or other stuff. It has all been thorougly tested and documented by Peter Scott. BFI 3 is the best and Toyota standard filter is the best.
Instead of the cups you can cut out the whole bottom part of the airbox if you like. That's what mine is like. Works well.
If you want it to look snazzy underneath the cover which is part of the BFI 3 then use the cups instead. |
Cristian Gruber
Tinkerer
VIC
UZZ31 SC400
Posts: 46
Reg: 07-2005
|
Thanks Benny |
Peter Ha
TryHard
NSW
Soarer TT
Posts: 348
Reg: 07-2005
|
yeah i was thinking about doing that Morgan, but thing is im not sure on what piece of metal to use to make the "heat shield" for the pod. do you have any ideas? |
David Vaughan
DieHard
ACT
Soarer GT-L (4.0 V8) Lexus is300 (3.0 VVT-i 6)
Posts: 596
Reg: 07-2005
|
Dave, I measured a fuel efficiency improvement of 3-5% in two months of similar driving before and after a BFI. I talked about it in a post somewhere on ALSC earlier this year
Christian, I consider Peter Scott's research on this to be authoritative (see Benny's reference) but if you are after prior discussion, your question has been asked before. See for example
http://soarercentral.com/sc-forum/messages/126/10762.html |
David Vaughan
DieHard
ACT
Soarer GT-L (4.0 V8) Lexus is300 (3.0 VVT-i 6)
Posts: 597
Reg: 07-2005
|
Pen, the reason for the discrepancy between your comment and mine on fuel consumption may be that you are considering the engine in steady state whereas the conditions in which I saw the improvement, over 3,000 Km, were entirely moderate to medium speed driving and acceleration on open urban roads. I think the acceleration area, given you are going for the same level of performance, is where you have improvement. A petrol engine initially adds fuel to go faster, with a little more required if the airflow can not keep up in that short period of response.
In slow city driving or steady cruising on the freeway I would not expect an observable improvement. |
Thomas Mulraney
TryHard
South Australia
JZZ30 TT
Posts: 170
Reg: 07-2005
|
this is the short-term solution I'm using for the time being Peter. It only cost me $8 and it seems to be doing the job alright, but when I get more time I will probably build a proper box out of some sort of metal. Anyway, its heat proof (up to 100deg.C) rubber with foil backing. Just use cardboard to develop a template than cut it out. I got the rubber from Clark Rubber.
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