Power Fluctuations With Ebc

[G_Force]

Hi,

anyone out there running a EBC have problems with power fluctuations on their dyno graph?

This is sorta a continuation from a post i did a few weeks back. Long story short, a no. of ppl mentioned that my power graph(attached) is all over the shop, timing n fuel maps could be out. Ive since spoken to my tuner n he seems to think its becoz im running a EBC. Reason for the unstable power graph is becoz the EBC pulsates alot. To solve it, take it out. Im not too convinced of the explaination given and i dont really want to remove a $460 EBC anyway.

Bass Junky, u posted ur graph the last time, i can see that its way smoother than mine is, wot sorta boost ctrl were u running at the time?

My mods - Power FC with boost ctrl kit, turbobak with split dump, FMIC, pod, BOV.

Cheers.

R34_dyno_Power___AFR.pdf

Edited October 25, 2006 by G_Force

[Nabil]

I have the same prob in my rb25.

It has a HKS EBC on 12.5psi it spiked to 14psi on a warm day on the dyno. T

This effected how much power I mad; as it spiked to 14 it made 211.2rwkw and then drops back to 12.5 to make aroung 205rwkw. However, other than that I had a healthy fuel and power curve.

It will spike more when the air temp is cold as colder air is more dense that hot air; thus give your engine some extra power and a little more stock boost.

Doesn't really seam to be the cause of your problems though. It most likely comes down to tunning errors.

[paulr33]

check for exhaust restrictions, once the gate opens it should be stable

so its probably not the controllers fault, the tuner could do some testing to test and prove that theory, other than "its the controllers fault".

try a run with the exhaust dropped off so its just dump then to atmo

see if spikes then, it may reveal a different story as there is no backpressure restriction

[G_Force]

Nabil, my tune was done on a warm day.

Paul, im pretty sure there are no restrictions on the exhaust, whole system is practically new, catback i have is a Blitz NUR Spec, one of the highest flowing catbacks on the market, when u look down the pipes, u can see straight thru to the other end. Cat is a Catco large body from BATMBL, split dump also from BATMBL.

I'll be seeing my tuner next week but i just wanted a 2nd opinion on the problem.

Cheers.

[Bass Junky]

When people say spiking, they mean that it ramps up to say 14psi and then backs off to 12.

Your tuner seems to be implying that the boost is Fluctuating.

Different things....

[G_Force]

When people say spiking, they mean that it ramps up to say 14psi and then backs off to 12.

Your tuner seems to be implying that the boost is Fluctuating.

Different things....

My mistake... i exagerated it by saying spiking, fluctuations would be the more precise term. Either case, i havent heard of anyone else having this problem caused by an EBC. One would think that incorrect timing n fuel maps would be the more likely caus of it. Anyone else agree?

[Bass Junky]

Ask your tuner for a graph of Power Vs Boost.

This will be a very good indication of how the boost is performing.

[G_Force]

Ask your tuner for a graph of Power Vs Boost.

This will be a very good indication of how the boost is performing.

Thanks for the pm's Bass. Somehow i still didnt receive the timing maps u were trying to send me, maybe there was a problem with the upload?? Anyway, appreciate the help. Perhaps email it to me. I'll pm u my email.

Cheers.

[Bass Junky]

NP