SeRboostSr20

hey guys. i have been in the process of tuning my ser. so far i have got the idle to stay in the 14.7 area and partial throttle at 3k driving under a load to be 14.7 area. this is supposedly the way to set your k value. am i right? the driveablitly of anything under boost is awesome the car idles awesome. pulls 15in/hg and idles rock solid at 900. (s3m cams). Now when you get into boost in second gear the car will be about 11.3:1 a/f till about 6k. then it will shoot to the lean side. off the charts so ill back off of the throttle. i have tried a full pull in 3rd also but it has same results. and when we did map trace it didnt go past the last cell it was staying in cell 58 (max on my .bin is 60)(TP)

where am i going wrong.

please help.

ps this is all on 7psi with no boost spike at all.

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94 Aztec Red Sentra
Gtir Motor Swap with S3M Cams Love Fab Turbo Manifold and a 3in turbo back.
Turbonetics 60-1 With a PWR Water to Air Intercooler
JWT Ecu 72lb program with Z32 MAF
P11 G20T Tranny. Lenso's and M+H slicks
All Rolling on Drag DR20s and Ksports.

SeRboostSr20

13 views and no one has an idea

billc

I just came to look at your avatar again.

Seriously, this question is way over my head -- good luck with it.

hpro123

Calum or someone who has experience with the particular program/maps should chime in here but... the way you are describing it your maps need some rethinking.

1st, I assume this is NOT a case of inadequate injector size which would indeed cause this behavior.

2nd, did the map tracing showed that the ECU actually VISITED the last column and stayed there? The way you have it phrased "it didnt go past the last cell it was staying in cell 58 (max on my .bin is 60)(TP)" does not make it clear! Of course it did not go PAST the last cell! This is why we call it "last" ! But did it stay there ?

Can you post a screen capture of the Maps and or the map trace?

If it does not reach the last column AND goes ultra-lean ther4e may be something wrong with the MAF + VQ map combination.

If it does reach it but goes ultra-lean then (excluding the injector thing) you will need to add fuel in hte last column OR (and) expand the maps.

scrildo

Exactly why I'm afraid of this Calum thing. All this talk is like chinese to me I don't have a clue what you guys are saying. God luck with this guy.

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Once you go turbo you'll never go back!!!
1993 Ruby Red SE-R SR20DE+T RIP junked 3/06
1995 Infiniti G20
1994 Aztec Red SE-R W10DET powered

Greg Amy

Three letters for you, man: J-W-T. Clark understands the chinese (quite well) and can take care of you.

But, if you want flexibility and the ability to tune yourself, better crack a book and learn the language...

SeRboostSr20

sorry i meant it didnt reach the last cell nor did it past cell 58

so im assuming by what u say it is my maf + vq settings.

i can send you my .bin if that helps.

also im using 750cc injectors so i don't believe its the injector size issue

thanks for any info you have

daveracer

His injector size isn't the problem. I bet he's at about 50% duty cycle at 7PSI.

I still think it's your gauge Jeff, since the car doesn't miss a beat even after 6K.

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Calum

Can you datalog a run?

hpro123

Scrildo,

"this Calum thing" is actually called "learning to tune your own ECU" !

This has been something that was the holly grail of Nissan aficionados for at least 10 years and it has been a God-send gift to us in the last 3-4 years!

As Grega said, if it scares you go JWT and you will be happy and not affraid.

SeRboostSr20

i cant datalog the wideband but im assuming i could datalog the run from the ecu itself.

im not to familiar on it.

G-Unit91

yea jeff you can datalog the run using nissdatascan i can show you if you want

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NewEnglandSR20's / Noise-O Fabrication

scrildo

I don't wanna go JWT. I wanna learn. Just a bit scared I guess. I do have experience with the SAFC though but it is totally different from this. I'm a quick learner but I don't wanna purchase the calum unit and not have anywhere or anyone to turn to for help.

Calum

Use CalumSult if you could. Just connect to the right com port, turn the gauges on, then datalog. You can use the 'window' function and it will automatically start at whatever rpm you set then stop when the rpms start to drop and you can plot vs rpm.

I'm particularly interested in the maf voltage up top where you think your going lean.