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The mkiv Supra Owners Club

NA owners may be interested...


neo2810

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AAS in Newcastle are machining an intake manifold for a racing NA and will be fitting BMW throttle bodies and some other bits and bob's to make it effective. They are pretty sure that with what they are doing to it, they will acheive 300bhp without the expense it's taken in the past. The car already has a aftermarket ECU, some weight reduction (no aircon, etc), some engine rework and an AAS tubular manifold but even so, I'll be keen to see their power results after fitting this.

 

Nevertheless, once they have everything in place, they will be looking to sell the part, so I'll keep you updated on how it's going.

 

Just on a side note, the overfuelling I was getting after fitting the manifold and intake has disappeared so it looks like the stock ECU is quite capable of learning a new system and adjusting itself. It just takes a good few weeks.

Cold air chamber I'm building is well underway as well so we'll see what difference it makes. I'm not expecting much or even any increase in power but I do expect it to stop power dropoff once the engine bay heats up.

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Really cant see the fitting of BMW throttle bodies and a stand alone ECU making 300BHP, i think maybe the "other things" will be the deciding factor;)

 

Also the std ECU doesn't learn, other than idle control, as it stays in closed loop until late in the RPM range, so it runs on the lambda feedback for most of the time and after that a fixed map with knock control.

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Can anyone explain to me why ITBs "sound" any different to a single throttle when used with a road car airbox type intake setup?

 

They dont, only when you've got open bellmouths, then they do though :)

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Also the std ECU doesn't learn, other than idle control, as it stays in closed loop until late in the RPM range, so it runs on the lambda feedback for most of the time and after that a fixed map with knock control.

 

Interesting... Something has sorted itself out then.

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It seemed to be idle to 4000.

 

Guess its down to how the ECU behaves when it has to re adjust the idle/cruse via lambda feedback, it seems some are able to force more adjustment than others, and after having a quick squint at the manual yesterday, i think it might have something to do with the idle Co adjust screw/pot, i wonder if its used as a coarse limit control?

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Why does everyone think ITBs suddenly increase power so much :blink:

 

Its ridiculous to think this even with an aftermarket ecu and manifold. Perfect example is the red one stateside. Its made 214hp and that's NOT at the wheels. You want 300hp out of an NA you better have deep pockets. Engine rebuild with higher CR, aggressive cams, lightweight internals, properly ported head etc etc.

 

You will never see 300hp off TBs alone

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Bare in mind YSR are the only tuning company to hit over 300 mark on the NA but that was with a totaly rebuild engine with all custom made parts or so the spec list suggested on speedhunters and we all know how much custom engine parts can cost so for a exhaust company to state such things IMO is just silly.

Edited by Kirk (see edit history)
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