Rb25 running rich. Feels very slow

[Ryankikkr33]

Rb25 running rich. Feels very slow

I have a 94 r33 gtst that's running rich and feels very slow. At and idle A/F sit anywhere from 14 to 16. At a steady 3k rpm cruise it stays fairly steady at 13.1 And under load goes all the way down to 10.2-10.4 And puffs a little black smoke.

Tuned at 18psi last year at Rs tuning in Toronto. Made 400whp.

Gt3076r

720cc injectors

FMIC

FPR

greedy intake manifold

3" exhaust, cat delete.  

Yellow jacket coil packs

300zx MAF 

300zx Ecu

Walbro 255

Any idea will be appreciated 

Thanks

 

 

 

[inmaniac]

Things to check:

• O2 Sensor
• Boost leak
• Clean MAF
• Temp sensor
• Plugs/Coils (incomplete ignition)

That's off the top of my head.

[Ryankikkr33]

Thanks I'll check those. How would I go about checking temp sensor?

[KiwiRS4T]

3 hours ago, Ryankikkr33 said:

Thanks I'll check those. How would I go about checking temp sensor?

Try disconnecting it (its the sensor with 2 wires that goes to the ecu).  If it works better (from a default setting in the ecu) then get a new sensor.

[blind_elk]

The A/F ratios sound perfectly average, ie roughly what they should be. It might be possible to tune the full load a BIT leaner.

The "slowness" is possibly a function of the bigger / laggier (?) turbo.

[Ryankikkr33]

The turbo is very laggy, don't see full spool till close to 5k. Same setup last year and it was much faster. Definatly running rich though, oil reeks like fuel, black smoke, a lot of flames. I appreciate the input guys anything helps

[admS15]

Check wastegate is shutting properly. Turbo should be at full boost at low to mid 4k rpm at latest.

[steventt]

X2 vacum leak

[Dose Pipe Sutututu]

Could be the Z32 incorrectly interpreting knock too and you're jumping into the knock map.

I'm assuming the car is running a Nistune? 

Also a bit too rich and lastly I suggest upgrading to better ignition coils.