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please help. bogs at 5000rpms...

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faulkner

Proven Member
191
1
Apr 22, 2013
spring lake, Michigan
okay about to give up...not getting any good help.
i go to do a 3rd gear pull, hit boost at about 3k rpms. it will pull hard! for a couple seconds and once it hits about 5k rpms it bogs like it wont keep accelorating and looses pull... its not just stopping like fuel cut before. i got my apexi safc 2 installed (dont know EVERYTHING about tuning it) and my innovate LC-1 wideband like everyone told me to get rid of my previous fuel cut issue. this isnt any better...
anyone have any tips solutions? i was told many time to buy a wideband and safc to solve the problem and have it be a fun daily driver / fun toy not a race car. so i bought them and installed, now what can i do to fix this with what i have?
My mods:
weisco pistons
ARP head studs
EVO 560cc injectors
wally 255 fuel pump
EVO lifters
new heads
Eagle rods
Evo III 16g turbo
3" apexi turbo back exhaust
FMIC all hard piping
Apexi safc 2
innovate lc-1 wideband
acp stage 2 clutch
run 93 octane

1G BOV recirculated to intake
 
Have you compensated for the injectors on the safc? What were your readings on the wideband when this happens? Have you used the logging software the wideband came with to check things out when your doing a pull?

I just think you may have the safc not tuned correctly.

I've been playing around with mine on the stock setup to get used to it, I've got 560's and a fuel pump sitting in a box till I get more comfortable using the tuner.
 
Hahaha... k, you need to start off by reading how to use it and how to use it on the dsm platform... if everything is zeroed out you are around 20% too rich. Google setting up safc dsm or something along those lines. Read and read the links. Right now with the stock fuel setup I've been around -1 to -4% just compensation the rich factor that's already tuned into these cars... you are 20% higher than that with 560's.

If you haven't started tuning for the injectors that's 100% your problem. Start off as a base of -15% across the low throttle and use the wideband from there at your throttle points... say you start at the -15 and your wideband read 9.1.... to are still rich, you need to get lower... you could end up at -18 to -20 or so.

Just read up on how to use it

Edit
This will get you started and give you the best idea of where you should be, DO NOT JUST COPY THESE AND CALL IT GOOD! Every car is different, I'm just posting this because they give you an approximate tune or idea of where you should be. Youll still need to fine tune for yourself.

http://www.roadraceengineering.com/newafcsetting.htm

Good luck, use the logger and wideband :)
 
Last edited by a moderator:
okay i have everything at like 30-35 right now... how bad is that, too much?

also the top right of the engine bay has like four vaccume lines. (where lines should come off, both have a wire plug in. my plugs are plugged in but my vaccume lines are not on it...could that be a problem?

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yes i did, i overshot the whole - throttle percent and made them all -30-35 when it only needs maybe
-8-12. and what are the "honeycombs" and "adjusting screw"

And can anyone tell me about the picture above I posted. What are those, looks like a hose goes on both. And each one has awire connector pplugged in. Do I leave it like that or unplug it?
 
yes i did, i overshot the whole - throttle percent and made them all -30-35 when it only needs maybe
-8-12. and what are the "honeycombs" and "adjusting screw"

And can anyone tell me about the picture above I posted. What are those, looks like a hose goes on both. And each one has awire connector pplugged in. Do I leave it like that or unplug it?

I don't know what the pic is of, but the honeycomb and adjustment screw are things you shouldnt mess with anyhow. Honeycombs are in the mas and the screw is one in the throttle body

Also, I know it says you installed a wideband, but did you run it at -30 to -35? Did it even read anything since that's probably well beyond its reading range....
 
I know where they are but I don't know what they are sorry and ik its against site rules to say that but hopefully I can help by clairifying to other people. They sit right on top of the engine bay right behind the intake manifold if I remember right they get hooked up to the vaccume lines that run behind the intake manifold. Does your car have a check engine light on right now?
 
yes i did, i overshot the whole - throttle percent and made them all -30-35 when it only needs maybe
-8-12. and what are the "honeycombs" and "adjusting screw"

And can anyone tell me about the picture above I posted. What are those, looks like a hose goes on both. And each one has awire connector pplugged in. Do I leave it like that or unplug it?

So are you talking about your low throttle settings only here? Wot (high throttle) settings should be significantly different
 
If you unplug them you may cause the check engine light to come on. What does the wideband say when bogging starts?
 
I am kind of thinking that you still aren't adjusted correctly, I've got #'s from pming a couple members and the high throttle ones I've gotten for 560's is waaaaay off from your -8 to -12. Is the widband calibrated? What are your afrs cruising?

Just for reference, from two different members with 560's they gave me their high throttle corrections and they are both starting around -18 and going to as low as -26 at midrange rpms, then backing off slightly by 6000-7000 throttle points to low 20's.

I still feel like the tune is the blame, are you using the logging software that comes with the innovate widebands?

Also, since I have yet to install my wally 255 and injectors... I'm just giving these #'s to you a reference based on my own research. I've spent hours on end reading about the safc and it capabilities. I had a couple members kindly share their setups with me prior to even purchasing anything fuel related.

Basically what I'd like to get at or I'm trying to say is, by me showing you some #'s I've acquired second third and fourth hand, they are all still ballpark #'s. Please don't just go change your whole maps to just try it because I posted them.

If your wideband is calibrated correctly, then like I said earlier on the common practice with evo 560's is to start out -15 on the low throttle and go from there. This information was given at least 50 times in other threads just like this one.
 
okay yeah i will start from there, but there is a hole in the side of my bov, (1g bov) and it looks like something should be there ill post a picture

air comes out of this hole where it says 14b when you blow in the bottom of it...so could that be releasing pressure while in boost?

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That could he an issue, but the diaphragm inside should still seal up to that point, if you notice where its drilled in relation to the recirc hose it should still seal... honestly to me it looks like someone ghetto rigged that to try and make it louder. I'd get a new one anyways.
 
You could go with a 1g crushed or get an aftermarket one flanged for dsm, just make sure its a recirculating model. I love my tial but I don't know if you want to drop 250 on one.... the flange also needs to be welded on by a shop.

Either way its either a $30-40 1g or dropping over $150 for a quality bov, not a fleebay $39.99 special.
 
Not to bring out the MacGyver in me... but you could pick up some jb stick weld (the bar that looks like a grey twinkie) and use some of that to cover it, then sand it up flush and make it look pretty.

Damn, now I want a twinkie.
 
haha that could work, i just tapped it out a bit with a drill. (gently) and used a short thick bolt and a dab of thread locker. BUT just cruising around say 2000 RPM'S my WIDEBAND IS READING 11.5-12-4 i have HI throttle set at 20-24 and LO at 16-18 on my safc

CORRECTION!!!!!! HI throttle set at -20 - -24 and LO at -16 - -18
 
haha that could work, i just tapped it out a bit with a drill. (gently) and used a short thick bolt and a dab of thread locker. BUT just cruising around say 2000 RPM'S my WIDEBAND IS READING 11.5-12-4 i have HI throttle set at 20-24 and LO at 16-18 on my safc

CORRECTION!!!!!! HI throttle set at -20 - -24 and LO at -16 - -18

Well from there you just need to fine tune your setup. Sounds like youd be safe to up it a percent or two. Just remember you can sit with the car in neutral and set the first lo points, set idle just sitting there, then rev and hold at 2k or as close as you can, set that... so on... copy the 4 k across the board thru 7k. That's how easy the lo throttle setup is. If you are cruising and notice a lean spot just adjust it a little at your next stop.

For the hi throttle that's where you need to have the logging software going or have a friend in the car watching the wideband/rpms. But the logger would be best, because you can go back in to specific rpms and see what the afr was at any specific time during the pull.

Hoping to get my stuff in my car this weekend (injectors, fuel pump, fix leaky o2 housing gasket) then ill be in the same boat :thumb:

Btw, what boost are you running? I'm going to shoot for 20, probably take it to 17 first and see how things go with tuning... then once I get fully used to the safc jump it to 20. Right now I'm at 13 on the stock pump so ill just be doing baby steps to 20
 
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