jroy1234
01-24-2013, 01:20 AM
Ok i am not one to post before researching ( i already have) but i want to get some feedback on here.
I installed the gt2560r today and the car is running quite lean. I have a enthalpy tuned ecu(used).
My set up:
-550cc injec
-z32 maf ( wiring specialties harness, so it has the PnP connector)
-255 wali
-aremotive fpr (set at 43psi with vacuum off and 37psi with)
-aem wideband
Here is what i found out:
maf
exhaust leak
Vacuum leak
All the hoses on the motor are new, i did the swap at work (Nissan) and replaced everything down to those BS OEM 1990 OEM clamps.
My biggest red flag is that the manifold has a slight leak that will be welded friday, but i read the the stock ecu doesnt use the o2 readings at idle just maf and coolant temp sensor.
When I start it. at idle, it runs perfect at start up (warm) then peaks and fluctuates with perfect afr's but then as soon as the idle drops after peaking afr's go straight to >17-18. and under boost the best i got was 15. the SR has never had any fluctuation problems. ever.
I adjusted the fuel pressure up and the fluctuations grow faster (900-1300) with no change in the afr's.
The car was running a bit rich (12-13.5, sometimes @ 11 under no boost cruising) with the stock t25 with the same mods and tune, but never had a lean problem. I also never had the ground connected on the MAF and it still functioned perfectly.
Right now i have the MAF ground connected, set factory fuel pressure, and leak tested any vacuum leaks. My biggest red flag is that manifold leak.
Let me know what yall think.
I installed the gt2560r today and the car is running quite lean. I have a enthalpy tuned ecu(used).
My set up:
-550cc injec
-z32 maf ( wiring specialties harness, so it has the PnP connector)
-255 wali
-aremotive fpr (set at 43psi with vacuum off and 37psi with)
-aem wideband
Here is what i found out:
maf
exhaust leak
Vacuum leak
All the hoses on the motor are new, i did the swap at work (Nissan) and replaced everything down to those BS OEM 1990 OEM clamps.
My biggest red flag is that the manifold has a slight leak that will be welded friday, but i read the the stock ecu doesnt use the o2 readings at idle just maf and coolant temp sensor.
When I start it. at idle, it runs perfect at start up (warm) then peaks and fluctuates with perfect afr's but then as soon as the idle drops after peaking afr's go straight to >17-18. and under boost the best i got was 15. the SR has never had any fluctuation problems. ever.
I adjusted the fuel pressure up and the fluctuations grow faster (900-1300) with no change in the afr's.
The car was running a bit rich (12-13.5, sometimes @ 11 under no boost cruising) with the stock t25 with the same mods and tune, but never had a lean problem. I also never had the ground connected on the MAF and it still functioned perfectly.
Right now i have the MAF ground connected, set factory fuel pressure, and leak tested any vacuum leaks. My biggest red flag is that manifold leak.
Let me know what yall think.