Flat Spot In My R33 Gtst

[SKY338]

Can someone please suggest what to do? I have an R33 GTST 94' Auto. Only mods are a pod and a turbosmart boost tee. I turned up the boost to 10psi and I believe I’m hitting R&R (car has a flat spot between 4,000 - 5,500 RPM) can some suggest a way I can prevent this from happening without spending big $$$ on new ecu's and tuning for now. Take into account it is an auto so I’m limited to what computers I can use.

Thanks

[Plattsy]

thats not r and r buddy.

you have a f**ked coilpack.

where are you located?

[SKY338]

Narre Warren, Melbourne. hmmm but it dosnt miss though? or dosnt it need to?

[Plattsy]

your right round the corner......

it feels like the car is hesitating. youll boost, then nothing then boost.

if its r and r its like driving into a brick wall.

[Dose Pipe Sutututu]

thats not r and r buddy.

you have a f**ked coilpack.

where are you located?

or your spark plugs are shot

[Plattsy]

or your spark plugs are shot

or that.

[89CAL]

Turn the boost back down to 7psi and see if it does it

[SKY338]

when i put my foot flat down it goes then feels like the car is resticted then after 5500 RPM it pulls again thats whats happening. I Change the plugs last friday. when its on 7psi it doesnt do it. anything past 7psi it dose. whitch is why i thought it was hitting R&R.

[Dose Pipe Sutututu]

what plugs did you put in?

I had iridiums when I bougth the car, same deal.. when I upped the boost it would hestitate and sound liek a machine gun.. dropped in $4 plugs and problem fixed

I used BCPR6ES

[GTSBoy]

when i put my foot flat down it goes then feels like the car is resticted then after 5500 RPM it pulls again thats whats happening. I Change the plugs last friday. when its on 7psi it doesnt do it. anything past 7psi it dose. whitch is why i thought it was hitting R&R.

That's because in the midrange you are are peak torque and hence peak cylinder pressures and therefore the hardest to ignite mixture condition. As the revs get up past that, cylinder fill starts to decrease and it gets easier to ignite again.

[SKY338]

That's because in the midrange you are are peak torque and hence peak cylinder pressures and therefore the hardest to ignite mixture condition. As the revs get up past that, cylinder fill starts to decrease and it gets easier to ignite again.

So what do i have to do in order to stop this?? thats my question

[Dose Pipe Sutututu]

what plugs are you running?

what are the plugs gapped at?

what coil packs are you running?

[GTSBoy]

So what do i have to do in order to stop this?? thats my question

Upgrade ignition components. Whichever ones are not working. Start with new plugs, move on to Splitfires if need be.

Edited December 6, 2012 by GTSBoy

[SKY338]

what plugs are you running?

what are the plugs gapped at?

what coil packs are you running?

just normal NGK Plugs gapped at 0.5 and standard coil packs (whitch appear to be in good condition) im not getting any miss fires.

[SKY338]

I might invest in some splitfires, i just didnt want to get them yet if it isnt the cause of the problem.

[Dose Pipe Sutututu]

just normal NGK Plugs gapped at 0.5 and standard coil packs (whitch appear to be in good condition) im not getting any miss fires.

normal NGK? which ones man.. there are heaps of normal NGKs

no point gapping them at 0.5 on such little boost

[GTSBoy]

I would never gap any plug at 0.5mm. To have to do so indicates that the ignition system sucks balls and needs to be fixed/upgraded.

[Dose Pipe Sutututu]

I would never gap any plug at 0.5mm. To have to do so indicates that the ignition system sucks balls and needs to be fixed/upgraded.

Does depend how much boost you're running.. I found running 0.8mm at 1.4 on splitfires it would sometimes miss (on my old R33).. I dropped it to 0.6mm and it was all good.. however the spark would be shit.

[Dose Pipe Sutututu]

1.4bar

[GTSBoy]

I dropped it to 0.6mm and it was all good.. however the spark would be shit.

Consider my case rested?