lok33

Is there a basic formula for HP for your FD based on the mod you've done. I've never had mine on a dyno and I'm curious. I know aftermarket parts vary in HP gains but there is a ballpark estimate.
Here's my mods:
New Motor
Rebulit Turbos (12 psi)
DP
Midpipe
Power FC
Intake
Apexi N1
Lightweight Flywheel 9lbs

I think I would be real close to 300hp??

Maybe we could set up some kind of refernece table or something.

lok33

I also have the Greddy Pulley Set

rynberg

Your estimate is probably close but tuning is everything.

Go to a dyno, it will be $50-$75 for like three runs. Go to one that has a wideband hook-up so you can see what your A/F ratios are. Who tuned your PFC or are you just using the basemap?

Lith

Sorry to dredge up a very old post, but I am a newbie who is soon to be purchasing a Series 7 and these mods are the closest to what I have been considering - and I wanted to avoid flamings for not doing a search

Did this car end up getting dynod, and how close to this output did you get? And when referring to 300hp, is this flywheel or rw hp you are talking about?

My plan is:

Dyno tuned Power FC, very free flow exhaust system from turbos back (catalytic converters are not a legal requirement here in New Zealand ), cold air intake, front mounted intercooler, and max 12psi on stock turbos.

My basic aim is a reliable 300-320hp at the flywheel, based on experience from your set up is it feasible? What kind of 1/4mile times have people with this kind of set up achieved?

Mr rx-7 tt

iTrader: (5)

You should make 315-325 rwhp with that set up. My brother made almost 310 rwhp with the same set up and a hf cat.

r0t0r-rooter

If/when you dyno tune your PFC you will know

Lith

Excellent, thanks for that I was hoping/guessing that area would be possible - but if I wasn't going to be able to get more than 300hp (@ flywheel!!) reliably without more serious amounts of work I would have been a little put off the purchase... but it seems more than within reach.

xstacy7

with those mods, you are probably going to need to start looking into fuel mods....fuel pump, injectors, blah blah. I have almost the same setup as you, minus the intake (for now ) But I'm not currently tuned (can't get the damn PFC working )

Jack

Icemastr

iTrader: (2)

I have Apex Intake, Downpipe, Resonated Midpipe, Apex GT Catback, Power FC /w Commander and a Greddy 2 Row FMIC, HKS Ignition Amplifier and Spark Plugs and Wires going in tommorrow. I am estimating my horsepower probably 350FWHP right now, hoping for 330WHP getting dynotuned on Friday. Highest boost I have hit is .85 (set at .9) and I am hitting 90% injector duty about 7000RPM in 2nd and 3rd gear if I punch it meaning, I need to take it easy and I need fuel mods. My recommendations if you want to keep it easy: Intake, Downpipe, Midpipe, Catback, Power FC /w commander and get it tuned. Should be about 300RWHP easy but you might need your wastegate ported (I haven't had problems though) if you keep it at .8bar you probably wont go over 88-89% injector duty. Much more and I think you need fuel mods (I do already). Full pulley kit is good for another 15HP at the wheels maybe. I will have my dyno results on Friday.

Lith

You do have fuel mods, or you just need them? Will you have that sorted out before your dyno tune?

Either way, am very interested in hearing about the results of the tuning... and how the fuelling holds out

BMike

Interesting, my Knight Sports Ecu is supposed to be good for intake/dp/mp/exhaust/intercooler and 1 bar and run fine. Are you guys saying stock injectors arent enough for that boost with the mods? I will be running a Cosmo 20b fuel pump for safety's sake. I can't find much info on the knightsports, but the Pettit unlimited seems to claim that you can run the same mods on it without any mention of injectors that I've seen. Or are the PFC users just tuned pig rich for safety? I've seen alot of people talk like 11:1 or lower is a common A/F to use on the RX. Most turbo circles ive been in look for 12:1 to 12.5:1 as the optimal range.

Lith

Actually, funny you should say that - something that occured to me just after I wrote that last post (but I had to shoot out and didn't have time to edit it) is that I have heard the Power FC runs very conservative mixtures to start off with, even more so that the standard ECU - so these cars with Power FCs installed but not tuned might be running significantly higher duty cycles than actually required to still safely run the engine at 12psi with said modifications

All the same, I would still not personally run more than 12psi on stock injectors and fuel system - just because I like to leave a little room to breath

rynberg

Bmike:

You should not run 14 psi with the stock injectors. If you saw your duty cycles, you'd probably have a coronary.....as Lith said, you are leaving yourself about zero safety margin. Personally, I can't believe that PFS, Pettit, or anyone else would say their ecus are good for 14 psi.

Dyno testing with a wideband has shown that the PFC base map is actually leaner than stock.....which is once reason you gain hp just by plugging it in.

BMike

Well now I'm a bit worried, I think im gonna start off at 10 psi like stock and get it on a dyno with a wide band anyways so, I guess I'll see what it does. If my A/F stays below 12:1 am I ok? Is there a magic number on the RX? I'll have to figure out a way to keep an eye on injector P/W before I get too crazy.

rynberg

You'll want the high rpm/under full boost A/F ratios in the 11:1 to 11.5:1 area. If you want maximum safety, tune more for 11:1.

For comparison, the stock ecu (under full boost) starts at ~13:1 at below 3k rpm and smoothly goes down to 10:1 at 4.5k rpm and then dips below 10:1 until about 7.5k, where it comes up to 10.1:1 . This was on my car with a downpipe and cat-back at 10 psi.

DavidDeco

Not too sure about that being always true. For one the base maps have changed from time to time. I also once accidentally reset to the default map or initialized the PowerFC and it was way rich.. I realized it after a few minutes - at first I thought whole car had gone.

Even adding other parts of the maps from people with similar mods, I wound up taking significant fuel out in SOME sections.

rynberg

David, the numbers I have seen for the PFC may have been from the "base" map. As I understand it now, the current PFCs ship with the "base mod" map. Perhaps that is the reason for the difference?

DavidDeco

Well there are a least 3 different shipped PowerFC maps depending on version...I'm calling the fuel correction x the 'hidden' base map = the base map. They differ slightly but nothing too drastic. You can see them on this forum I think or maybe the Datalogit forum.

What I have realized that if I normalize (using the datalogit software) the initialized/default PowerFC map on mine so that Fuel Correction is 1.000 and do the same to my maps I regularly use so that all changes are reflected in that 'hidden' base map for an apples to apples comparison- there are plenty of parts where my map is leaner than the one you get initializing the PowerFC.

I've heard the same of what you've said but maybe I just have a weird setup. I too have always heard to be careful of running the base maps as they are lean but for me , it seems they are generally rich comparing to mine. Mine are just tweaked alterations of others posted on this forum so no great thing there.
I pulled quite a bit of fuel out once I had my Wideband and datalogit working and Dyno-ed pretty well for my mods on only the slightly aggressive side (upper 11's).

Lith

Dredging up this thread again - its past Friday, how did the dyno tuning go?