So how does DCIs compare to stock and modified air boxes…the results are in

[pbondar]

For those not following the other thread on airbox discussions here’s the abridged version..

All on an E89 35is running TTE500 turbos on 99 RON fuel..

So here’s the answer to ‘well how does it compare to DCIs?’…

Today’s dyno runs..

The chart with 3 lines is tune V17 (iteration 19) which has been tweaked to reduce timing corrections and improve spool..peak power is slightly down on the earlier v13+..torque up..two versions one with the Mr.5 mod and one using DCIs…compared to v13+ with the Mr.5 mod…

The chart with 5 lines is version 6 of the tune ..revisited twice..once with a Mr.5 mod and one with DCIs

 

[CantSitStill]

Great to see some actual tests on the dyno mate. So looks like the DCI's are flowing more in the mid range (25HP more!!), do you have a log for these runs by any chance? Do you taper boost up top considerably as Mr 5 and DCI seem to be equal at higher RPM's which is surprising if the DCI is providing more air/power mid range

 

[pbondar]

Great to see some actual tests on the dyno mate. So looks like the DCI's are flowing more in the mid range (25HP more!!), do you have a log for these runs by any chance? Do you taper boost up top considerably as Mr 5 and DCI seem to be equal at higher RPM's which is surprising if the DCI is providing more air/power mid range

I do have the logs as I left the MHD data logger running for the whole dyno session..I’ll try and find the relevant ones and post them..given that this behaviour on the DCIs is relatively consistent across several tunes and configs I surmise that the primary reason for their strong mid range torque increase is the removal of destructive interference effects caused by pulses from the inlets merging and interacting in the airbox..there is not enough physical volume to allow these pulses to dissipate without interfering with each other..in the engine bay the DCIs can dissipate these pulses in part through their construction and in part due to venting into a much larger volume..

You see a modest similar effect when you remove the air filter or change it to a foam filter..peak torque increases a bit but high end power not much…

 

[mikedeburgh]

Peter question, had line V6+DCI (red) ther same tune as the yellow one (Stock airbox)?

 

[pbondar]

Peter question, had line V6+DCI (red) ther same tune as the yellow one (Stock airbox)?

Yup…stock airbox only really starts to fall off way past 400 BHP

 

[mikedeburgh]

Thx, 38hp increase is massive. Do you remember how much psi/bar you had with this tune?

 

[pbondar]

Thx, 38hp increase is massive. Do you remember how much psi/bar you had with this tune?

Peak boost is about 21-21.5 psi tapering towards the red line

 

[desmo11]

Did you ever run a half n half setup? The point to this is that you cut the flow in half, so the pressure loss should be cut by a factor of 4.

 

[pbondar]

Did you ever run a half n half setup? The point to this is that you cut the flow in half, so the pressure loss should be cut by a factor of 4.

Half n half?

 

[desmo11]

Yes, front turbo on its own inlet up front (similar to relo inlet) with DCI, rear turbo through stock airbox with cold air inlet. Recirc valves: 1 into rear turbo at stock location, 1 into airbox at front turbo outlet. Silicone inlets. RN I am working on that, I currently have the inlets set up similar to above but with DCIs on both.

Half n half inlet setup

All, I'm in the process of setting up my inlets a little different than usual. On the rear turbo I plan to use a silicone inlet, but with the stock type air filter/airbox, with cold air duct. On the front turbo, I will be running a relocated inlet type (silicone inlet as well). Coolant tank...

www.spoolstreet.com

 

[pbondar]

Yes, front turbo on its own inlet up front (similar to relo inlet) with DCI, rear turbo through stock airbox with cold air inlet. Recirc valves: 1 into rear turbo at stock location, 1 into airbox at front turbo outlet. Silicone inlets. RN I am working on that, I currently have the inlets set up similar to above but with DCIs on both.

Half n half inlet setup

All, I'm in the process of setting up my inlets a little different than usual. On the rear turbo I plan to use a silicone inlet, but with the stock type air filter/airbox, with cold air duct. On the front turbo, I will be running a relocated inlet type (silicone inlet as well). Coolant tank...

www.spoolstreet.com

Way too complex for me..plus I detest gauze filters…planning on a very long life for my engine..gauze filters run counter to that..

The view from my tuner and seperately the dyno / tuner guys who all know N54s very very well that I got a great result and should settle for that..especially as longevity is a design goal

 

[desmo11]

Gauze filters are just fine unless you're in the desert and not servicing the filter. Either way, agree you can't have crap in your inlet air, so do what you have to to address that....