flatspot on r33 gtst auto???

[sweetr33]

WEll i just put a set of new ngk spark plugs and a greddy manual boostcontroller on a mates r33 and the car runs fine until u nail it. 1st gear goes well, i only set it to 10psi to steer clear of complications, but once it shifts into 2nd there is a flat spot until it gets to 6000rpm then it goes well and same in 3rd gear. It feels like the car is hesitating but power iis still rather progressive but just not pulling till 6000. Any ideas?Oh and the car is dead stock besides a can back system.

[heartbrkr]

doesnt the auto usually shift up at 5,500?

[Abo Bob]

It's the stock ECU putting a flat spot in the power due to higher boost probably.

[sweetr33]

the auto changes gear at 6500 rpm.

We think it may be the auto computer causing the flat spot too. I have disconnected the factory boost solenoid and connected my boost controller do u think that would have an effect? My r33 doesnt have a factory solenoid inplace and just had my boost controller so i did think there would be a drama. any thoughts?

[4door_Sleeper]

sounds like the standard computer is your problem. Get an aftermarket computer or daughter board.

[Abo Bob]

10 psi is low for this to happen but it sounds exactly like so many other threads if you know what I mean.

[JaFF]

i get this all the time. just bought a SAFC II.

Hope it fixes the problem.

[nedb]

Make sure your speedo wire isn't cut which removes the 180 km/h speed limiter. I had the wire #53 cut and i kept ketting flatspots towards the end of 2nd and 3rd gear.

If unsure the easiest way to check it is try to hit 200 km/h as some speedos are not 100% correct and it might show you 180 km/h + when doing 170 km/h or so.

Oh yeah make sure you do it on a private road or the track :innocent: