kwikrx7

I was at WOT in 3rd and 4th gear when racing and hit what felt like a fuel cut at 6.5K rpms. I talked to Dave at KDR and he said that engines have been popping all over the place under load because the PFC comes with timing maps that are too high. Easy fix but everyone be careful with the PFC under load unless you've already adjusted the maps.

Mach2

Kwikrx7,
your observations are correct. The new PFC's come with the base "mod" maps instead of the base "stock" maps when new. I tuned my maps with lots of help from Cewrx7r1 (Chuck) to get safer timing considering that the base "mod" maps that came with the PFC had too much advance in certain areas for my liking. If anyone is interested in these new maps I can post them. They use the base mod ignition for lower and higher rpms and base stock ignition for midrange. There were also mods done to specific areas on both maps to correct split. The trailing maps are also entirely modified. The fuel maps were also modified.

skotx

Like you even have to ask. Let's see em!

Hey, if you do post your maps, can you give some broad comments on what you changed and why? That would really help newbies like me.

OC94Rx7

I am also new to the Power FC and would like to see your maps and comments like Scotx. I don't drive my car in the winter, but have tried to collect as much info as I can. Thank you Chuck and Scott for their maps. Scott, your map site is really nice!
Oliver

weaklink

hey skotx,

why don't you add your site to your profile so my lazy *** doesn't have to search everytime i want to see it?

weaklink

how do you know if your timing is too advanced?

skotx

Hehe, I try to remember to press that damn sig button when I post but I guess I'm just too st.. st.. stoopid. I'll add it to my profile too.

50tooslow

I am somewhat curious about this. I bought a tuned PFC from SR. I had it one week and experienced the same problem with getting to 6500 and then nothing, quit pulling, like a fuel cut. Not rough or harsh just quit pulling. I checked my o2 reading and it was too low for my liking. It was reading somewhere around .8 to .82. A couple of days before it had been up in the .9's solid. That freaked me out so before I hurt anything I have my car apart putting in bigger secondaries new fuel pump and getting retuned by SR. Kind of sucked only had it one week and sent it for retuning.
But I figured better safe then sorry. I don't think it was any problem with SR, I just think I outgrew the 850's. Oh I also checked to make sure i wasn't the boost cut, it wasn't. The PFC was set at sc .75 and I only got to .74. I don't know if I can help at all but I should have everything going again next week and I will let you know if it fixes it. I will also start the process of writing down my maps. If anyone thinks that this won't fix my problem please let me know.

Jonesboro

I just purchased a PFC and haven't yet installed it, so the matter of correct timing maps is very important to me.

Since I purchased a used PFC from someone with a highly modified FD, the first thing I did was to "initialize all settings" on my PFC. I found that it initialized to the "base mod" settings not the "base stock" settings. My car falls under the definition of "base stock" since my mods are only downpipe, cat-back, and a stock air box with K&N filter. I will be inputting the "base stock" maps into my PFC before ever running my engine. For those of you not familiar with the significant differences between "base stock" and "base mod" maps, see skotx's very informative site:

http://www.exorzero.com/skotx/powerfc/

I had simply assumed that the initialized settings for all PFC's would be for a "base stock" car not a "base mod" car. That would have been a costly assumption! This Forum disclosed the differences and I'm sure saved me from a blown engine. I wonder how many "stock" FD owners installed a "base mod" pre-programmed PFC into their "base stock" cars without knowing it and that alone resulted in major engine problems? Isn't that what kwikrx7 is implying when he started this thread? Unfortunately, this scenario doesn't seem to explain the blown engine experienced by kwikrx7 because his sig suggests the "base mod" maps would be compatible with the mods on his car.

I believe that the main lesson here for all new PFC owners with "stock" FDs is "PFC is not plug and play" despite what you might have read or been led to believe. At a minimum when you first install your PFC and before you ever start your engine, view the maps programmed into your unit, compare them with the maps on skotx's site, and determine if you are mapped correctly for your car. If not, make changes accordingly. I suppose if you want to be extra cautious ($$$$$$), have your PFC pre-programmed specific for your car by an expert prior to installation.

weaklink

Another potential problem I can see is by using maps from those that have sent their PFC off to be programmed. They can change the base fuel map there. After that wouldn't anything displayed by the commander and subsequent maps be essentially worthless except for that particular car? Am I way off base here?

Tim Benton

iTrader: (1)

I often wondered about the base maps for the PFC being set to high or advanced. From what the first post said about KD thinking that too, doe sit have to do with the base mod or base stock maps still have timing maps for the higher octane gas they have in japan? That would explain the timing being to advanced for our cheap gas/**** we have to use here. Anyone know, Jason, if the timings been changed in the base stock/mod maps for the american market gas. I think this was answered a long time ago but with the forum changing and going down back then some threads weren't saved.

Tim Benton

skotx

From what I've gathered from the discussions on this site, there are only a handful of places that tune a PFC: XS, SRMotorsports, Rotary Performance, and KD Rotary (new to me as of this thread). There may be more, if so, let's get a list going. Only XS has the Power Excel software, so they are the only ones that can alter the base maps. The rest are safe for our use.

cewrx7r1

iTrader: (2)

My PFC came from Ray with the base mod set. The displayed timing
(IGTL and IGTT) under monitor mode above idle, matches the IGT map cells per boost and rpm.

Those of you that have a PFC with the hidded maps modified by XS, do the same test and see if the monitor mode displayed timing is the same or different than what is in the IGT maps. They should be different.

Inquiring minds want to know.

KZ1

I am sure he depends wether or not your engine is ported. My car runes fine with stock port. adn base timing maps.

weaklink

I wanted to know about this too, in other words, is the commander displayed map a correction map (like the fuel) or absolute. If they are correction maps then it is conceivable that there could be two timing base correction maps that shipped with different versions of the PFC. Conceivably, if you used the correction map from a later version with the base maps of the earlier version then it could lead to big problems. Other than pinging (unreliable) is there any other way to determine if the timing is too advanced? I occasionally get knock above 60, but I have never felt any hesitation, roughness, anything. To my knowledge knock is never that high under WOT.

Scott Olsen

Does anyone know if timing should be more or less advanced for a car with a mild street port?

cewrx7r1

iTrader: (2)

Anything that causes the engine to breath more air, requires more fuel and less timing advance.

kwikrx7

Dave at KDR said he could reprogram my PFC and reset the timing maps but I have to wait until Feb. 5th He told me to stay out of hard runs of boost since this is where the problem is but if I drive normal then I'll be ok. I'm not running the base map as he tuned the PFC for non-sequential, streetport, etc. My FD gets dynoed that day also so we'll get it figured out. My engine didn't blow, but Dave said that hesitation up high was probably detonation but it didn't do any damage. he said that the PFCs come with timing maps that are too high and cause problems over the long haul. I'll find out more but not until Feb. 5th - I'll keep everyone posted on what I find out.

telmopereira

Where can i see those maps?? I think that is a question of life or dead for some of us that are using the PFC for first time, and all the help we can get is precious.
thx

paulr33

hi guys

im a bit curious as to what this 6500 flat spot or cut seems like.
ive never seen or heard of this issue before. what does the map trace show when you experience this problem? the only simiiar issue (that i can think of?) that appears similar is when we've seen a cars map trace hit the bottom row of the load map. the fix was to edit the air flow meter calibration table and scretch out the airflow voltage vs load table so the max wasn't at the bottom of the table but more in the middle.