For those of you tuning wizard, please read my story and help me out.

I have installed some exhaust mods and found that my power is still the same as the factory spec.

I've dynoed on a dynopack dyno before bone stock for about 248 rotor hp. After I installed Blitz intake, Mine's stainless straight pipe, central 20 type II rear section, and custom made mid pipe with no resonator. I went dynoing again at the same shop with the same dyno, but the power out put was around 220 rotor hp!!! The technician told me it was running too lean, so I installed a Greddy E-manage and asked Johnson from Ultimate Racing (shop famous for tuning turbo here in Toronto) to adjust my Air Fuel ratio to the optima level. He did a street tune and adust the AF to about 12.

So I tried to race a bone stock track pack, we did couple of runs:

1.) Off the line, rolling start: we roll out at 1st gear, 20km/h then floor it. 1 and 2 and 3 I'm a bit faster but after he hangs on.
2.) On highway: going bout 100km/h, 3rd gear pull, he hangs on to me all the way until 220km/h after I started pulling from him.

All these suggested that my car is almost the same as a stock z with all that mod!!

I've raced a automatic z with injen exhaust, high flow cat and injen intake, we are about the same too! But when I went dyno with this guy, his Z pulled 260whp and my was only 230whp!! At the same dyno, same day, with no more than 30 min in between our runs. Only this technician said it was running too rich!

I've talked bout it with my friends, and they suggest Y-pipe, header install to see if freeing up more air flow will do the job!

Does anyone have any professional suggestion? And please don't say Turbo, I jsut want to install my intake/exhaust mods now and gain some power to play with.

Thnx, any educated replies will be greatly appreciated.

 

with 175/35/18 rear tires prolly just spinnin a hole

 

With a A/F of about 12 to 1...yes , you are to rich ....I believe a A/F of [12.8 to 13.2 to 1 ] would be more suited for a N/A car . Maybe a good tuner will reply and confirm this

 

You really won't see the gains till it is all finished. I say finish out all the breathing mods, full length headers and new plenum (wait for 350EVO to release theirs), then drop in a set of 276/256 cams and you will see gains. Also your tires are awfully wide, I would goto a 245 or 255 in the back and see if you do any better. 275 is like FI sized tires. You can always slap on a set of R-compound 255s for the track and outgrip those ppl riding on 305 street rubber XD!