How hard can it be?

[Slong]

I have a rough patch at ~2800RPM, it's been so long I can't even remember if this is one of the traits of the Gen1's.
I was told that an attempt had been made to tune it into smoothness but apparently it can't be done.
It's not so much rough but rather is not a smooth area of acceleration/deceleration and I always find my self in that range when riding around start stop traffic.

I find it hard to believe that it can't be smoothed out.
Ideas?

I think I removed the 6.8k resistor mod last year.

[Volvi]

sounds like you need a reliable TRE, I recommend the GI Pro w/ATRE by speedohealer, also a gear indicator.

[Gnarbunkle99]

If it can't be done its the 4k rpm inline 4 primary imbalance.

[Slong]

Checked and I've still got the 6.8k resistor doing it's thing.

I've had an intelligent TRE years ago, from the US, IC(chip) based ATRE that did everything I wanted - had gear indicator, 4 different 'map' settings ie 333456, 444456 etc and did neutral properly hence as an ATRE should. It gave up the ghost at 5/6 and I had a replacement one that was wired differently so that didn't work.
I've read of the GiPro and would consider getting it but read of similar results after a while regarding 5/6 gear detection.
My real point is, apart from having neutral run properly and no GI, an ATRE won't do anything else that the 6.8k resistor does.

Gnarbunkle - what is this cheesecake imbalance you refer to? Too much topping? But seriously, is it some natural harmonic voodoo other than that 4k(4.8k?) vibe that all Busas have? Something all 4 cylinder engs have?

[spamanglenn]

balance the throttle bodies,clean the injectors and make sure its a little richer in that area.Mine shudders through 2500 as well.Perhaps try 98 octane to eliminate detonation as the possible cause.Or definately try without the tre for less timing.

[Gnarbunkle99]

Slong

Rough patch at 2,800rpm is not due to the primary imbalance to which I refer. I guess that you probably also have airbox mods and pipe, if so its more likely that the fuelling/ignition is a little off in the rpm range where the airbox flapper used to do its thing.