wow no low end power
 

alright the car runs great when I keep things under or around 4k rpms for driving around town. After I take it to higher rpms and it actually sees the full 8psi, it seems like the car just dies off between 1-3k for the next 15 minutes.

d16y8 - stock internals
t3 - 8psi
s-afc
450cc injectors
fmic

I've been told that the s-afc advances the timing quite a bit. Would this lack of power in the low end after seeing boost be due to that? or is it something more like a pressure drop?

I bought a BTM to help with timing and have been told not to tap into the vacuum on the FPR, but I didn't think the gauge would be that big of a deal.

Also what are the effects of:
1. not having the 1st o2 sensor in the downpipe on a obd2 car?
2. not having this in the intake? and does it go before or after the turbo
http://rustdha1o.home.mchsi.com/engine03.JPG


http://rustdha1o.home.mchsi.com/engine02.JPG
http://rustdha1o.home.mchsi.com/engine01.jpg

Re:wow no low end power
 

If anyone has some tips on afc settings that would be great. These seem to be working ok for regular driving, but maybe they're too rich in the high end? Flooding could be an issue I suppose, but I was afraid of running lean. I'm really at a loss here. I intend on taking it to a dyno soon, but I don't quite have the time or money at the moment.

lo
1k -41
2 -41
3 -40
3.5 -38
4 -37
5 -36
6 -35
7 -34

hi
1k -41
2 -40
3 -40
3.5 -39
4 -37
5 -36
6 -35
7 -32

Thanks in advance for any pointers. I'm always trying to learn more about this so it's appreciated.

Re:wow no low end power
 

hmmm the afc settings seem ok./..maybe a tad to rich on top, but should be fine...it could be the 1st o2 sensor you don't g\have that is causing the problem

Re:wow no low end power
 

Check your base timing...

Re:wow no low end power
 

this may seem ignorant, but how do I do that?

Re:wow no low end power
 

You have a 1.6L 4 cylinder honda motor... your not supposed to have low end power lol.

Re:wow no low end power
 

The first o2 sensor is the one that controles your air/fuel mixture, the second one moniters the converter.

Re:wow no low end power
 

lol well yeah I'm aware of that, but it's worse than usual

and highroller, I had read that - so you're saying that's my problem?

Re:wow no low end power
 

do you have your exhaust hooked up? if not, it would definitaly help

Re:wow no low end power
 

I would think you should start hear, instal the front o2 in the bung, hook up the front o2 wiring, leave the rear 02 unhooked and try that ;)

Re:wow no low end power
 

I have no exhast on my car and it halls ass, if you didn't have a turbo I would agree.

Re:wow no low end power
 

yeah the exhaust is hooked up. I had the downpipe custom made and for some reason didn't have a bung put on it for the sensor.

Re:wow no low end power
 

that little sensor not hooked up is the IAT (Intake Air Temp) Sensor. You might wanna hook that up, a hole drilled in the charge pipe and some jb weld will do it.

Definitely get that o2 sensor hooked up, usually that will make you run ridiculously rich.

Also, thermal99.com for some AFC Settings.

8)

Re:wow no low end power
 

change 1k to -47 on lo and hi.

Re:wow no low end power
 

got the o2 sensor installed and now i have a different problem:

the car wont go into boost at all. it just bogs out and sputters when it sees boost.

was messing around with the spark plug gap because i had some backfiring. i found the least amount of backfiring around .4 - i suppose since i got the o2 sensor installed things could have changed. should i try gapping them at .3?

Re:wow no low end power
 

Sounds like shes going into limp mode now.

Re:wow no low end power
 

ok that means its running really rich, correct?

Re:wow no low end power
 

make sure you're fuel pump is good. i have a walbro 255 and it had the filter it came with on. i mounted the oem honda civic filter instead of the one it brought and it runs better and idles better. the honda fuel filter that goes mounted on the fuel pump is way less restrictive then the one my walbro255 fuel pump came with. also, do not T off the FPR. get some 5/16" plastic Ts' and T off the charcoal canisteemissions filter, and the PCV valve, both of those provide better vacuume/boost source power then the FPR. also, i had my BOV/wastegate hooke upto the FPR for a boost/vacuume source and i was running leaner that way with the same vafc settings then when i hooked up the wastegate/bov to the pcv valve for the BOV and the emissions charcoal canister for the wastegate. just check your intake manifold for hoses hooked upto it that are bigger then the regular vacuume hoses and T off those. make sure it's not the ones under the throttle body for coolant. test the hoses disconnected for vacuume before you cut anything.

Re:wow no low end power
 

ok thanks - i no longer have anything T'd off the FPR. i fixed that the other day.

Re:wow no low end power
 

did you hook all the stock sensors back up by now? You really should have all the required sensors where they are supposed to be to eliminate some of the possibilities.

Re:wow no low end power
 

all the required sensors are in, yes. the car runs fine for daily driving.

i reset my ECU and the CEL went away. The car does go into boost, but it takes forever to spool up and when it finally does make it to 8psi, the CEL comes back on and the car then decides to run like ----.

could this be the ECU going into limp mode because it's seeing boost? possibly a bad connection with the AFC causing it to not override the MAP sensor?

Re:wow no low end power
 

I think you mayb e to rich up top...and the hack isn't working anymore...

Re:wow no low end power
 

shim the waste gate you'll pick up low end but lose some top 8 washers behind the acuator mount ;D

Re:wow no low end power
 

so yesterday i took the whole thing apart - basically started over since i was so frustrated. well i come to find out that the turbo had actually vibrated loose a bit from the manifold and there was a tiny gap between the two. hence my loss of power and the obnoxious exhaust leak.

all is well except i'm still getting a CEL relating to the map sensor (108, i believe) - tomorrow i'm going to recheck the wiring on my AFC