still running lean.........
#1
still running lean.........
my car is still on the lean side. it has a walbro fuel pump, new fuel filter, pressure gauge reading 42psi at idle, and an hks afr that is running at 47% and still leans out after 10psi. now do i need bigger injectors? or is my fuel pump weak? or maybe something else? im looking to run up to 15psi and i cant even get passed 10, any help appreciated...
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mabye the injectors are 100%?
mike
mike
#7
HAILERS
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Just curious......what are you using that tells you that the car is running lean?????
Just from my very limited experience, I've never seen my car run anywhere close to lean at 10psi using the stock ECU and stock injectors. But then mines a series four and maybe? the lower compression is why.
Just from my very limited experience, I've never seen my car run anywhere close to lean at 10psi using the stock ECU and stock injectors. But then mines a series four and maybe? the lower compression is why.
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#8
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Hailers beat me to it. How do you know you're lean? I'd be very surprised if you're running lean unless the tuning of the AFR is completely hosed up. What do you mean when you say it's "running at 47%? Was it dyno tuned?
Also, is that a stock turbo? 10psi is OK, but 15psi is asking for early turbo death. I wouldn't want to run 15psi through the stock IC either.
Also, is that a stock turbo? 10psi is OK, but 15psi is asking for early turbo death. I wouldn't want to run 15psi through the stock IC either.
#9
i have a haltech haltuner a/f guage, its very accurate, i only trust it now because when i did have it dyno tuned my guage was dead accurate. im going to run a constant 12 psi on the stock turbo with a spearco front mount. and the 47% is the increment i am running on the hks afr ( max is 50% ) at 5k rpm+, once my car hits 4k rpm and up it starts to lean up a bit, to about 12.5- 13:1 all the way to 6k, i dont redline my car ever cause of it being lean.
#10
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Originally posted by smg944
i have a haltech haltuner a/f guage, its very accurate...
i have a haltech haltuner a/f guage, its very accurate...
im going to run a constant 12 psi on the stock turbo with a spearco front mount.
...the 47% is the increment i am running on the hks afr ( max is 50% ) at 5k rpm+
#11
yea i agree, i am taking it in this weekend to have it on the dyno. now if it really is lean with all the settings the way they are what could be my problem? faulty injectors? i thought i wasnt going to need more then 30-40% to run safely at 10 or 12 psi, i only followed this guage because when i did have it dynoed it was right on the mark. but its probably off. when i am at wot it stays in the rich area just not maxed out ( 11.5:1 ). its like 3-5 bars short. ( 12.5-13:1 )
#12
I'm a boost creep...
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Most people reduce the fuelling when they use fuel controllers. The factory mixtures are already very rich at full load, so more power can be found by leaning them out a bit. Blown engines from lean outs are usually caused by running to much boost on the stock fuel pump. It's not the ECU or the injectors that are the problem. You've upgraded the fuel pump so that should be OK.
Fuel flow could still be a problem. How long since the filters (tank and engine bay) were replaced? Have the injectors ever been professionally cleaned? What's the fuel pump voltage?
Fuel flow could still be a problem. How long since the filters (tank and engine bay) were replaced? Have the injectors ever been professionally cleaned? What's the fuel pump voltage?
#13
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Most people reduce the fuelling when they use fuel controllers. The factory mixtures are already very rich at full load, so more power can be found by leaning them out a bit. Blown engines from lean outs are usually caused by running to much boost on the stock fuel pump. It's not the ECU or the injectors that are the problem. You've upgraded the fuel pump so that should be OK.
Fuel flow could still be a problem. How long since the filters (tank and engine bay) were replaced? Have the injectors ever been professionally cleaned? What's the fuel pump voltage?
Fuel flow could still be a problem. How long since the filters (tank and engine bay) were replaced? Have the injectors ever been professionally cleaned? What's the fuel pump voltage?
#14
i changed the engine bay filter but i didnt change the in tank filter, neither did i check voltage on the fuel pump. i figured it was new so it would be fine. i do have a pressure gauge on there reading 42psi at idle. as for the injectors being cleaned , that has not been done. also where can i check the fuel pump voltage?//
#15
also just curious but how much hp should i be pushing? heres the list
88 t2 stock engine 110psi on both rotors
stock turbo ( 9 psi )
stock intercooler
no air/pump p/s a/c
elec. fan
walbro
hks afr
3" tid
dual pulleys + underdrive
2.5" dp
2.5" bonez high flo cat
apexi dual n1 cat back
act 6 puck
jacobs ignition
jacobs 8.5 wires, ngk 9's
to come:
spearco front mount
12 psi
88 t2 stock engine 110psi on both rotors
stock turbo ( 9 psi )
stock intercooler
no air/pump p/s a/c
elec. fan
walbro
hks afr
3" tid
dual pulleys + underdrive
2.5" dp
2.5" bonez high flo cat
apexi dual n1 cat back
act 6 puck
jacobs ignition
jacobs 8.5 wires, ngk 9's
to come:
spearco front mount
12 psi
#17
I'm a boost creep...
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Originally posted by smg944
i didnt change the in tank filter...
i didnt change the in tank filter...
...neither did i check voltage on the fuel pump. i figured it was new so it would be fine.
i do have a pressure gauge on there reading 42psi at idle.
as for the injectors being cleaned , that has not been done.
also where can i check the fuel pump voltage?
Last edited by NZConvertible; 06-18-03 at 03:05 AM.
#18
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what's your fuel pressure at 10psi?
or is it under the hood?......
so you are saying you are adding 47% fuel?? and if it was set at 0 it would be stock?
at 10psi mine is leaned out more then stock...
or is it under the hood?......
so you are saying you are adding 47% fuel?? and if it was set at 0 it would be stock?
at 10psi mine is leaned out more then stock...
#19
ok i will have to do all that over the weekend its raining here for the next 3 days. as for the injectors i think i am just going to upgrade already. what is a good set up to go with? next year i want to put on a t-66 or something that size and a shot of n2o.
#20
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I agree with NZConvertible. Wait until you get your car on the dyno, and try not to push your luck. Its possible you're running very lean, and its possible you're running VERY VERY rich.
You might have a half-dead injector... or one that doesnt flow well enough.
But there's no way to tell at this point. And no O2 gauge in the world is accurate unless on the other end is a wideband O2 sensor.
You might have a half-dead injector... or one that doesnt flow well enough.
But there's no way to tell at this point. And no O2 gauge in the world is accurate unless on the other end is a wideband O2 sensor.
#21
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You should be seeing about 50psi fuel pressure at 10psi boost. REwire the fuel pump for a solid 12 plus volts at all times.
See http://techedge.com.au/vehicle/wbo2/default.htm for some piece of mind.
Clean/replace the fuel pump strainer/filter in the tank. Thirty minute job.
Just a repeat of the above.
Oh, and when you do you dyno thing, just for grins, turn you headlights on and any and all other things (can't spell accessories). For the obvious reason. The alternator may not be keeping up and the fuel pump voltage may be dropping quite a bit.
See http://techedge.com.au/vehicle/wbo2/default.htm for some piece of mind.
Clean/replace the fuel pump strainer/filter in the tank. Thirty minute job.
Just a repeat of the above.
Oh, and when you do you dyno thing, just for grins, turn you headlights on and any and all other things (can't spell accessories). For the obvious reason. The alternator may not be keeping up and the fuel pump voltage may be dropping quite a bit.
#23
ok checked my fuel pump today. now with no accessories on at idle it reads 9.25v, under full boost it reads 12.10v. with the accessories on, lights, hid lights, turned on all my inside lights (because i dont have a radio right now). it read 8.75v at idle, and under full boost 11.66v. looks a little low, i think i am going to rewire it to get somewhere near 12.5-13v. i just got a brand new alternater along with a battery so its not that.
as for my spark plugs i just changed them about 50 miles ago so i doubt there is much on them. last set i removed though were lean burned.
also going to change injectors. whats a good set up to go with.
as for my spark plugs i just changed them about 50 miles ago so i doubt there is much on them. last set i removed though were lean burned.
also going to change injectors. whats a good set up to go with.