decoupe
(deceased)
My EFI conversion continues.
I mentioned that I had a set of e21 (320i) intake runners that because of their longer length are supposed to increase the low to mid range performance. The test was as intake to intake on the same dyno, roughly at the same temp and elevation and with no changes to the programming. Calgary is 3500' or roughly a 10% loss in power due to air density. Can't really see the difference between the two set ups but there was an average gain on both torque and horsepower to a maximum of roughly 3%. Interestingly at no point is there any loss. Not to bad a return on a $40 purchase price for all 6 runners.
For my next trick, I will be using an intake from an '89 735i - little more complicated so next winters work.
New e21 runners
Original L Jet runners
Dyno map with dotted = last year
Doug
I mentioned that I had a set of e21 (320i) intake runners that because of their longer length are supposed to increase the low to mid range performance. The test was as intake to intake on the same dyno, roughly at the same temp and elevation and with no changes to the programming. Calgary is 3500' or roughly a 10% loss in power due to air density. Can't really see the difference between the two set ups but there was an average gain on both torque and horsepower to a maximum of roughly 3%. Interestingly at no point is there any loss. Not to bad a return on a $40 purchase price for all 6 runners.
For my next trick, I will be using an intake from an '89 735i - little more complicated so next winters work.
New e21 runners
Original L Jet runners
Dyno map with dotted = last year
Doug
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