so i was looking around for the power FC for the rx7 and i couldnt find any on the website i was at. i was woundering does it really have to be specific or are all Power FC's the same ? If i need a specific one can somebody please send me a link. thanks.

 

check the vendors above, i believe FDnewbie was having a sale on them for a great price prior to their elimination from Apexi.

and yes they are specific, or at least were so you need to make sure you get one for an FD as they were also made to work for the S5 models.

 

Check out my PowerFC FAQ -

http://www.clubrx.org/media/pfc/PowerFC_FAQ.pdf

Dale

 

Wow Dale. This is timely for me - be getting my FD back shortly after PFC install/tune/dyno. Thanks!

 

^^^ Got it back Monday and have been driving it for a few days. Had it dyno'ed and tuned for 12 psi. It is a stock motor and squential twin with an RB cat-back (no cold air intake or intercooler upgrades). Still got 280+ hp at the wheels! Dang I wasn't expecting that. My car runs SOOO much better with the PFC. I ran it with the stock ECU for a year or two after installing the cat-back, all burbly, crappy when cold, hesitant from idle, ect. It runs better than it ever did now. Starts great hot or cold, runs great hot or cold, does not hesitate going from idle to WOT (mostly), cranks out the hp like it never did before, but...

My only issue is a lurch in the power band when the second turbo kicks in. I was told that is normal with a free flow cat-back and there is nothing to be done about it. Is it possible to adjust the PFC to handle the sequential transition better?

 

James,

You did not mention your boost values when the engine goes from #1 turbo through transistion to stable #1 + #2 turbo. If they too different it can cause a spike or dip. Is the lurch a spike of extra power or dip/loss of power. This is controlled by the boost pre-control system.

With only the Commander, this is set with the boost control BASE DUTY. Page 27 of the PFC manual. If after adjusting this you still have a problem, there are two options which depends if the lurch is a spike or drop. It is the pill size in the precontrol hose between the #1 turbo and the pre-control solenoid. This is assuming that the rest of the pre-control solenoids and other valves are working properly.

A smaller pill/orifice/ will slow down pre-spool and cause a power drop, or a larger size will cause a power increase/spike. Older FDs had a pill in the line, newer ones have it in the mettal nipple. Removing and inserting a small metal adjustable valve makes it posible to fine tune the transistion.

Wity a DATALOGIT, you can also go to Settings 1 and try adjusting the turbo transistion table.

Chuck

 

Thx for the reply Chuck. This thread is morphing, but since we are on the topic...the guy that tuned it at SR Motorsports said there was a spike in the boost. But he didn't have boost (or AFR wideband) monitoring while doing the pulls. So I don't have a record of the boost pattern for the runs. But, there is an obvious DIP in the power band starting at about 4400 rpm. Then by 4600 rpm, power rises more rapidly (second turbo kicking in I guess). By about 4700 rpm, it is back to where it should have been with a smooth transition. See attached dyno.

Once I get my Datalogit (ordered and will arrive shortly), I will record some runs in the field and see what the boost pattern is. Thanks for the tips!