5000rpm problem.
 

i have fd3s -94 with non sequential turbo mod, apexi sacf II, exhaust ported race and intake street. some more mods. i bought it 2 weeks ago and the previous owner said that it cuts because exhaust leaks so much. fixed that now it cuts off exactly 5000rpm atleast 2-3 gear. 1st gear it runs fine to the end.

I did notice others have same problem but no one ever posted that what problem it was.

vacuum lines are fine. only thing that all of the solenoids or what they even are was stripped of vacuum hoses. never cheked the secondary injectors? but i did notice that it would cut after 3800rpm so not related? can someone with same problem help me here te get some FACTS of this problem not just guesses?

thanks!

Sorry.
You Unless you Search this yourself you will only get what you get here,Both Facts and Guesses.
Since you yourself do not know your exact problem,neither does anyone else,so it is really ONLY guesses that you can receive..Right?

With that being said,I shudder every time I see an "SAFCII" hooked into the mix.99% of the time it is improper hook up or Tuning of that gismo that kills the Correct running of the vehicle.
I hope Sarge can jump in on this one..He is good with FD's.

Mistery is essentially dead on. We have a lack of information here, so we cannot offer up much information.

What actually happens at 5,000 rpm?
What's your boost? You do have a boost gauge, I hope?
Is the SAFC the only ECU mod?
Any fuel mods at all?
How do the plugs look/what plugs are being used?

This is some basic information we will need before we can do anything.

sorry for lack of info. so safc II is only mod in electrics... i spotted 2 wires hanging cutted from ecu pink and blue. i checked faults with diagnostics and it gave me atleast MAP sensor fault. i check em tonight again cause i took - cable off for 30mins and tried didn't check em after that.

BOOST: 0,55bar

i saw few topics where guys had same kind of problem:

Gears and symptoms:
N - normal
1st - normal
2st - completely dies for about 2 secs in 5000rpm
3rd - same
4th - never tried to accerlate because ffear of motor failure

and no lack of power before that: rubber burns almost too easy ;)

Engine has new atkins rotary master rebuild kit and its been running total 87.000km
so i think its not the apex seals cause engine runs just fine. and also it has hks twinpower, new sparkplugs and 7mm leads... what engine does if it is in failure mode? does it do that? if i try to clear out the failure memory?

sorry for bad language :) im from finland so its in my blood :)

Language is fine. The pink and blue coming from the S-AFC II aren't used on an FD. Can you get the exact error codes you saw? Those may be important.

We need to look at the S-AFC II settings.

Go to the "etc." menu and post the following information:

Sensor Select
Car Select

The FD should be a "Pressure" style sensor, with the the value of "04" on both the IN and OUT. Should be listed as a 4 CYL with the arrow starting in the bottom left going to the upper right.

If that all checks out, we need to know what corrections are being applied and what other settings are set. (Such as the TH-Point HI and LO values, the RPM values of the NeScale, etc)

it was a pressure type sensor but only 1 in and out... so i change that now first... thanks for that for now... ill gonna get the afr i think today cause i ordered a wideband sensor for my fd :) ill let u know thaks! :)

so i changed the settings to 4 in 4 out... it took 5500rpm great but i think the afr is so in woods that it aint working... i sret it to fatline and fullthrottle to bit on +. so it wont go lean... am i right?=)

and one thing there is no airflow meter what so ever in there just two filters... i think thats only with one map sensor that it measures and also oxygensensor in downpipe... so is this setting right? i mean 4 in 4 out?

It's hard to say without a wideband to see what's happening. But, if it is leaning out, that's what you would do to make it more rich. Is it hesitating or having problems at higher RPM's now?

yeah... i dont know is it choking or having too lean mixture... not going so well that it was when i bought it... but it was so wrong setting when i bought it lo-throttle: half of the range full (-) and hi-throttle half of the end was completely (-)... it runned better but died in 5000rpm... weird....

but can i ask what is the reason for 4 in 4 out?

can i somehow disable the whole thing so its not cheating ecu? would that correct that for normal drive with normal pressure? im sorry for apexi fans but this is kind of stupid way to fix mixture problems and its modding also timign isn't it?

well i got apexi off so its not it cause symptoms is the same... so whats next?

ok, vacuum lines was like shit so i put those like this:

http://i26.photobucket.com/albums/c1...risVersion.jpg

exept that both relief valves is missing..... so they are not connectet @ all

i spotted that problem may be the double throttle solenoid. there was resistor.. but just thinking is it the right kind? atleast when the resistor was off it backfired a lot... maybe thats not good :D so... i have to ask. should every other solenoids in there be blocked or removed completely now they are connected but not blocked? only one in use is Pressure regulator control. and what is the meaning of those blue lines in the picture? they go to airfilter.. should they be in there or does it matter are they just hanging off? please help im getting crazy here...

symptoms are:

shot cut in 2500rpm if driving normally slow.
complete cut 5500rpm if driving like maniac. not on gears N and 1st.

unbeliveable fuel drinking and smells like money (gasoline) alot. sometimes black smoke if quick accerlation.

BOOST: 0,5bar

thanks guys in advance.


AND ONE THING! can i run even the non sequential turbo mod with regular ecu?

or will this be better way to do this?

https://www.rx7club.com/attachments/...urbo-lines-jpg

and only rear rotor is making vacuum? is that normal @ all... car works fine and runs nicely so i dont think there is any damage done... but please help me....