turbo problems...help!
#1
turbo problems...help!
ok. I have a b18b with a t3/t4 turbo, bigger fuel pump and fmu. the only work i did was to replace a crappy nissan turbo, with this t3/t4. After the upgrade the car starts and immediatly runs extreemely rich all though i have 45lbs fuel pressure. I am running check valves inline with the map senser that were there before. Before this mod, the car ran rcich. Anyone know what might have happened?
#2
well, if all you did was change the turbo and turbo only...that would have nothing to do with it
the bigger turbo may add a little backpressure which would run a touch leaner but not crazy richer as you are describing
maybe you have a vacuum leak...forgot to hook up a vacuum tube to the proper location?
also....get rid of the FMU (my $.02), chip your ECU
the bigger turbo may add a little backpressure which would run a touch leaner but not crazy richer as you are describing
maybe you have a vacuum leak...forgot to hook up a vacuum tube to the proper location?
also....get rid of the FMU (my $.02), chip your ECU
#3
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really simple man bigger turbo = increased air intake... = more fuel needed to match air intake so basically the bigger the turbo the more air /gas mixture ur car needs ur o2 sensor might be compensating for the lack of gas i would check that for starters. when i had my car turboed i found that if u put a 300 ohms resistor inline on the signal wire of the o2 sensor actually in ur cat it will decrease the over compensation... dunno just a thought. good luck
#4
#5
Originally Posted by grittyspeed
ok. I have a b18b with a t3/t4 turbo, bigger fuel pump and fmu. the only work i did was to replace a crappy nissan turbo, with this t3/t4. After the upgrade the car starts and immediatly runs extreemely rich all though i have 45lbs fuel pressure. I am running check valves inline with the map senser that were there before. Before this mod, the car ran rcich. Anyone know what might have happened?
I only ask this because the same thing happend to me.
I used to run a garrett t3 on my b16a (.42 /.48) it would hit 7psi at about 2,500rpm then drop off from there (down to about 2-3psi by redline). I swapped turbo's to a garrett t3t4OE (.57trim .63 a/r) and it ran rich as a pig. That was using a 8:1 fmu and 310cc injectors. On the dyno with a 4:1 fmu and the 310's it was still rich (because of my gs-r ecu). I had to purchase a sfc to lean it out a bit. I was able to get my afr between 11.9:1 and 12.3:1 across the board. It's just an idea...otherwise i'd drop your fuel pressure down to about 36psi and try that.
#6
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i had that same problem with my turbo. i had the greddy 18g kit on my car and had 310 cc injectors with 10:1 fmu the car ran so rihc it would stall. i removed the fmu and go the apexi stand alone comp and got the car dyno tuned ran like a champ till i blew it =( twice.....