Dyno Problem.. R34

[NickSix]

G'day guys.. quick question...

I have a semi-auto r34GTT and have the following installed:

HKS Air Filter

Cat Back Exhaust

Dump pipe

On the dyno it made 162kw, since then i have installed:

3" Front Pipe

High Flow Metal Cat

Front Mount Intercooler

Cold Air Induction

After another power run it made only 164kw, the guy reckons that it may be due to the lack of boost (running standard 8psi) because of the extra amount of piping etc with the intercooler that there wasn't a significant increase in power. Has anyone heard of this before?

I noticed that when u look at the engine from the front of the car, there is a small air intake pipe on the back left hand side that connects to the boost gauge (i think), this pipe was split and wasnt connected correctly. The 1st time the car was dyno'd he used this point for the reading (the boost gauge was working at this point), whereas the 2nd time he used a different point for the reading (the boost gauge wasnt working). Could the lack of power be caused from the split pipe? maybe a leak?

Will be installing a boost controller next week and doing a tune to see the difference next week.

[Devils_Advocate21]

Curious do you have a graph of the dyno plot? As well as if there was a vacuum leak it would certainly show itself, rough idle, loud hiss type noise associated with it. As well as just curous do you have any ems or safc installed? Could be in tuning itself, Another theory is the dyno reads low, ie: 10% as compared to other dynos that would put you up in the vacinity of 180 rwkws. Amount of piping doesnt really reflect on lack of boost either 8psi is about normal with no boost controller.

But if your concerened that there is a leak amongst the piping some soapy water and put it around the joints, look for bubbles.

Thats a start

Just a few theories

Cheers

[NickSix]

Well that pipe that connects the head to the boost gauge was just hanging free, so there is definately a leak, but would it be the sole cause of the lack of horsepower?

And there are no aftermarket ecu's or controllers installed. The fuel ratio was at 11 ish so the tuning seemed to be fine.