Osgee

Hi guys,


Had my car now for some time and its had a few modifications.

Headers (shorties), primary cat delete ( stock cats opened and gutted) secondary cats removed stock res and stock rear boxes,

K&N drop in filters

Eurocharged map v5

When the headers were fitted cats gutted and map added the car madr a healthy 556bhp on the Dyno Dynamics Dyno, April 2014

Since then the car has covered approx 5000 miles - no faults or problems and only ever ran on shell v-power

Yesterday the car went back on the same dyno and made 518bhp, we found this very strange so we re loaded the map (my genius) and again the car ran a smooth 517, 518 bhp ..... no obvious problems just a few ponies missing

The ONLY diff this time to the car is that the fuel light was on, still had just under a qtr of a tank left of fuel.

It drives fine! But where has the power gone??

thesaintusa

Does the car feel as if it has less power?

Dyno settings / bad fuel?

Osgee

Car feels fine although ive not had chance to boot it to much, ive thought it may have been the dyno but other cars made expected power.

skaarlaj

I'm guessin your first dyno session was maybe a fluke, or the dyno's settings have since then changed. Imho, that's still a lot of power without even having long-tube headers.

Osgee

maybe, but i have 3 runs of 550 (on the day) is it possible it was a fluke ? Or could the stock res collapsed and restricted gas flow since then as its running no cats?

skaarlaj

I'm thinking something about the dyno changed from the 550 day? Tremendous difference in weather conditions?

Osgee

I said this, its the same dyno but in a new unit so its moved 3 miles to the new building, but the tuners are adamant its not the dyno and are saying other cars are making expected power.

Think i need another dyno.

odonnks

If you know anyone else that dyno'ed on the 550 day round them up and have them dyno their car at the new location.

Even if you pay for their dyno its worth it to see if you can narrow it to the car or dyno.

PeterUbers

Run it down the 1/4 mile and let that be the determinant