[Diy_efi] New project

[Mike]

At 11:52 PM 21/11/2002 -0800, you wrote:
>> BMW claims they can achieve greater than 100% VE on their M3 class
>> engines for a sizable upper part of their rev range - amazing what
>> intake tuning can achieve !
>
>I am noticed something like this on my car (94 Turbo Supra). The intake
manifold
>has been modified. Opened up, internal idle motor and EGT passages ground
off,
>new top welded on increasing plenum volume by about 10-20%, and fully extrude
>honed. I seem to get this weird spike in VE at around 2800-3000RPM. To get a
>consistent air fuel ratio in that area, I have to add 5-8% more fuel in, then
>take it back by 3250RPM from what a normal smooth VE curve vs RPM would look
>like. Weird.

Yeah - understood, all sorts of tuning resonsances can occur, but the
M3 is a non-turbo - so thats rather interesting, I suppose turbo
tuning inlets can be as much a black art in that respect,

rgds

mike


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