1st Log, Having Huge Problems, Need Tuning Help.

[j3rkoff]

Hey all. Got my car back from the shop for a new clutch pedal (chassis has over 100k, now it shifts like new ), and it definitely seems to me my throttle cable, or tps, needs adjustment... First tho, I'm having huge problems it seems.


RPM -------------Timing------------Throttle----------o2

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3rd gear pull @ 19 psi / 94 pump


AFC (low +5 across, stft close to 0 to 5000)

High (+ unless - is noted)
1k= 4
2k= 4
3k= 2
4k= -2
4.5k= -6
5k= -10
6k= -10
7k=-10

I hit fuel cut @ 5500, so i leaned 5000 out on my AFC for the run after (didn't log it), and it went away. but with this one i'm really confused. EGT goes over 900 @ 4000 rpm, but I hit fuel cut if i richen it. Should I look into an SX FPR? It seems like I run rich though, but since I'm new to tuning, I can't tell. I don't want to lean out any more until I get some advice, since the EGT's are high and timing is getting pulled like mad. Could my timing be off? Maybe the throttle probs are making a difference? Maybe .96 is too rich and it's killing timing?

Full boost doesn't hit until 4500, is that due to the (ghey) 10cm exhaust housing on the 'super' 20g? Or maybe the throttle too? I really hate this turbo. should've went 50 trim, but at least now i have mods to support one. Any help would be great.


Mark



(EDIT::: I just read a post that said for every lb. of boost, the ecu compensates 1 lb. fuel. So theoretically, with a FPR I could lean out the little bit to avoid fuel cut, and then adjust from there. I feel that wouldn't solve my problems fully though )

 

[j3rkoff]

Also, what do you guys think about taking it to the dealership to get the sensors checked, and replaced if needed? Last time I was at the dealership for service was a while ago, and I felt that they were kind of shady . Thx

 

[DCJ98GST]

If you are running 720 cc injectors, I dont understand why you are not super rich? EGT's can go up if you are really rich. But your O2's are saying you are in the right range?

 

[NJR Racing]

you should try to get your o2 voltage to .92 all the way across...your timing might be getting pulled because your to rich and getting knock.....
with 720's your afc should be somewhere in the -20's.....get your o2 voltage to .92 acrooss the board and make sure your timimg keeps advancing...you should end up with about 20-22 timing advance and redline......also i see your throttle never went too 100%.....if you had it floored you may need to adjust your t.p.s........good luck....your egt's are a little high but trust me your not maxing out those 720's on 19psi....

 

[Newlogics]

You are getting crap for timing at higher RPMs. I bet you're knocking and timing is being pulled (thus high EGTs).

You're def. WAY to reach. I rung 660s with 255lph pump and still had to lean out -18% at about 7K , and on average of -13% thoughout high end. (it was tuned by Vishnu, so I don't take these numbers out of my butt)

My O2s are .90, so you can imagine just how rich .96 is. Either way, even if you're now knocking, your timing is what causes EGTs to sky-rocket. I can't think of a reason for such a conservative timing unless you're knocking though.

(oh, and try logging stuff at 100% throttle. If I'm not mistaken, ECU will react a bit differently at full thorttle.

What are your high-low throttle points on SAFC ?

 

[j3rkoff]

AFC is at 30-70. I'll lean it out on the top-end and post my results. Thanks

 

[NJR Racing]

lean it out from 3000 on up......at 3000 your at .94(rich)....... .92 is afe and some even tune for .90......which to me is the border line on pump gas......so tune for anywhere between .90-.92 and your timing should take care of itself......and go WOT..........

 

[j3rkoff]

Logged it tonight and it's now @ .94 across. Still tough to tune out the top-end (pipe to throttle body blew off once during my 1st attempt to log.). You were right, somewhere around -20 is looking like it's going to be the sweet spot as far as the AFC high goes. I set it @ 7 pts leaner throuought, and it's still very rich. Timing is still getting pulled majorly, although, I noticed it doesn't sputter now when i let off the gas at high RPM. Throttle was @ 92% throuought w/o me adjusting anything, dont know what made it 87% last time. Timing is pulled worse between 5k-6k than before. I'll try adjusting all that tomorrow.


I'll post a log once i get to .92 across. Thanks for the help.


(EDIT::: What the hell, i'll post the one from tonight. Can't get to sleep.)


RPM -------Timing-------Throttle-----o2

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[j3rkoff]

Would it hurt to move the 4.5k point to a 5.5 k point on the high? Seems like it could use it there.

Just noticed that timing advanced 1 in the 2000-3000 range w/ o2's at .90. Maybe it is because I'm pig-rich after all, . I will post my log tomorrow (today ). Thanks .


(EDIT::: After further leaning out...Hard to make runs w/ the a/c off in 106 degree weather. My car seemed to like .9, doesn't it seem? I might have to richen out at that spot tho. I'll post later when i put some race gas in it and tune to .92)


RPM -----Timing-----Throttle-----o2

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[j3rkoff]

EDIT::: Here's a keeper. Now that I have it around 9., timing seems more regular. Correct me if i'm wrong. I also adjusted the throttle cable after this run, it's better now . What should i do now? How do I get the timing to reach 18-22 by 7000 RPM, which is ,from what i've read, is the ideal point?


@22 lbs., 101 octane

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[NJR Racing]

if your car is a daily driver i would not be tuning it at 22psi on 101.......use 93-94 and 18psi this makes it a little more easier.....when you are tuning on race gas .85 is a decent ballpark for o2 values.....so .90 on race gas is actually to rich thats why you still are getting timing pulled.....and why isnt your throttle at 100%......you will never get it tune right if you dont make 100% throttle runs...your o2 values are pretty good now just try to get your timing to advance throughout the rpm band.......good luck

 

[j3rkoff]

^ Thanks a lot for the advice. I'm tuning on race gas so I can (hopefully) make a dyno run this week. My throttle is at 100% now, I had to adjust the cable, because I really, really had to punch it to read over 90% (w/key turned, engine off, it was logging 100&, so I figured I had to adjust it). Most of the unposted logs between these are w/ throttle @ 95%. I don't understand why it was doing that for the ones I was posted tho, .


I didn't change much on the log I used to get .9, I had pump gas in there for that, and the AFC settings are generally the same for the race gas run above, which suprised me. I thought it would read richer. Thanks for telling me that .85 is a good point for race gas, I'll definately tune around there once I get to the dyno.

I'll update this sometime within the next week w/ dyno results, or maybe just another problematic log, . Thanks.

 

[j3rkoff]

Thought I'd update anyways to see if anyone has any tips...


Leaned out further (thanks for the tip on race gas being .85), I have it @.88 and timing seems to be returning to normal. Hopefully I can get in for a run tomorrow, if not at least I'll have it fully tuned out by then. I think my o2 sensor is starting to kick the bucket too (thanks race gas), on my blinky autometer, it keeps going back and forth at wot until @ 2500, it used to go to green immediately. Is that a sign?



(throttle hits 100.2 now, ...)

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[NJR Racing]

your log is getting better and your o2 values are real good.....i dont understand why you are still getting timing pulled.......your timing should be at 18-22 degrees at 7000...........yours is only 11 and i dont know why its doing that.....i know the basics on tuning but im not a tuning master.....hopefully someone with more knowledge can tell you why you timing isnt advancing like it should...maybe you base timing is off.....

 

[j3rkoff]

Maybe it's still too rich from 4500 on? I'll try to lean it out more, if not, then I don't know what to do.

My timing belt has about 40,000 mi. on it, can they adjust the timing when I get the belt done? I hear there's no easy way to do it on a 95-96 car. Thanks.

 

[j3rkoff]

Well, I killed my o2 sensor (good job race gas, ), so now i have to get it replaced. No tuning updates for a little bit, but since I have a ballpark figure for afc settings, I'll try and tune for timing.