does this look right (dyno chart)

[skyla]

Hi all,

Please excuse my ingorance when it comes to turbo powered cars.

Recently my R32 GTS-T, seemed to develop a noticeable flat spot through the mid range, I did the normal things like replace the sparkies and gapped them to 0.8, cleaned the intercooler, and replaced the AFM. Thinking that the problem might have something to do with worn components as my car has done very high kms (270,000) still on the original motor, turbo and gear box.

It has always felt a little slugish through the mid range from about 4700rpm to 6000rpm, but I never really paid much attention to it. Recenlty I put a pod filter on the car and the the flat spot had become more noticeable. A couple of people had suggested that it might be running rich, so I put it on the dyno to see what was going on.

Strangly enough when on the dyno it didn't miss behave, and from what I can gather from the chart every thing seems to be ok, although I was hoping that someone familiar with turbo powered cars enligthen me if I'm missing something.

The car is pretty much stock with only the K&N pod filter and a 2 3/4" exhaust.

One thing I did notice looking at the chart was that the boost seems to drop off a bit, is this normal or could there be something wrong?

Any advice appreciated.

Cheers

Rach

[R31Nismoid]

looks ok from that graph. There isnt any nasty mid-range bump you sometimes get with a stocker ECU.

RB25's its more pronounced though i think.

[The Mafia]

you sure that 520nm's is correct?

that dyno reading looks a bit high for a R32 GTS-T

[skyla]

Different dyno different results, yeah but to me, this looks on the high side of things, although on the same day as my run a SS commodore did 160rwkw, so it's a bit hard to tell.

[Lithium]

The Mafia - That Dyno outfit seemed to start getting results which read much higher after dynapack (hub dynos) started becoming more common in NZ. It seems like the figures have been "tweaked" to more closely match results obtained on hub dynos.

Dynos are a tuning tool, blah blah blah

[rob82]

Have you check the base timing. The knock sensor operates between 0 and 4000rpm, if it is sensing knock then it will retard the timing untill about 5000rpm. Always check the basics first.

[skyla]

Thanks Rob82, I'll get the timing checked