Strange Lean condition with plate kit
03-04-2013, 06:38 AM
#41
Anyone ever sprayed nitrous dry and used the "adder vs IAT" table to provide the additional fuel? With enough fuel injector that would seem to be an alternative since I'm always at a locked IAT when the nitrous sprays anyway due to the timing IAT relay.
Of course I'd have to change the tune for the injectors and sell the customer injectors.... And I'm not sure how low I'd have to command the afr to actually achieve what I'm shooting for.
Just thinking outside the box since nothing normal seems to fix this.... Atleast there wouldn't be fuel flowing through an intake that was never designed for fuel to flow through it.
Of course I'd have to change the tune for the injectors and sell the customer injectors.... And I'm not sure how low I'd have to command the afr to actually achieve what I'm shooting for.
Just thinking outside the box since nothing normal seems to fix this.... Atleast there wouldn't be fuel flowing through an intake that was never designed for fuel to flow through it.
Odd question, does it do it in any gear? I assume all of your pulls on the dyno were in the same gear.
03-04-2013, 07:49 AM
#42
I'm seriously thinking about installing some larger injectors just to see if it clears this issue up... Cheating the IAT has already been done for the timing anyway.
03-05-2013, 01:06 PM
#48
We tuned it "dry" via the iat fuel adder table and it is finally usable atleast. The fuel curve mimics the way it has been going lean, but now the lean slope shortly after it hits only leans up to around 13:1 afr with an afr of high 11's at the top of the pull.
It was a lot easier to change the tune in this way than the fuel pump... And since its safe now i'll be glad to see it go!
No one is going to convince me the pump is bad anyway when the fuel pressure safety switch and a pressure gauge tells me they are fine. I've diagnosed too many faulty or weak pumps with a gauge to think its a volume issue that still has perfect pressure...
It was a lot easier to change the tune in this way than the fuel pump... And since its safe now i'll be glad to see it go!
No one is going to convince me the pump is bad anyway when the fuel pressure safety switch and a pressure gauge tells me they are fine. I've diagnosed too many faulty or weak pumps with a gauge to think its a volume issue that still has perfect pressure...
03-05-2013, 01:22 PM
#49
We tuned it "dry" via the iat fuel adder table and it is finally usable atleast. The fuel curve mimics the way it has been going lean, but now the lean slope shortly after it hits only leans up to around 13:1 afr with an afr of high 11's at the top of the pull.
It was a lot easier to change the tune in this way than the fuel pump... And since its safe now i'll be glad to see it go!
No one is going to convince me the pump is bad anyway when the fuel pressure safety switch and a pressure gauge tells me they are fine. I've diagnosed too many faulty or weak pumps with a gauge to think its a volume issue that still has perfect pressure...
It was a lot easier to change the tune in this way than the fuel pump... And since its safe now i'll be glad to see it go!
No one is going to convince me the pump is bad anyway when the fuel pressure safety switch and a pressure gauge tells me they are fine. I've diagnosed too many faulty or weak pumps with a gauge to think its a volume issue that still has perfect pressure...
I might not have been the pump. It could be the sock on it or something else in the tank.
I told you to put a standalone in it to try and see if it would cure that and if it did then you know its a fuel delivery issue and head in that direction. You still kept trying everything except to see about the pump which you didn't look into or change.
It's your shop and money so I can't tell you what to do but I'm glad you got it comfortable enough let it leave.
03-06-2013, 03:00 PM
#57
http://cnx.org/content/m42205/latest...ol11406/latest
I wonder if it could have a restriction somewhere like a crimped line or something? You would still have pressure ,but, volume would decrease thus causing it to run lean.
I wonder if it could have a restriction somewhere like a crimped line or something? You would still have pressure ,but, volume would decrease thus causing it to run lean.
03-07-2013, 12:47 AM
#59
Everything needed to troubleshoot and find the real problem has been posted in this thread already. For whatever reason y'all want to be in denial that it could be the pump, you can't rule out something if you dont test it. When walbro had that bad batch of pumps years back I put 3 brand new pumps in the same car. Thats hard to swallow but anything is possible with electrical parts.It could be volume and not be lean the whole run in a couple of different ways. The pump may just not be keeping up with the initial demand and once past that its able to keep up.
I wish yall would stick with it and find out the real issue, it may suck and take some time but it can only be so many things. You just have to troubleshoot a nitrous kit, I can think of a lot of other jobs that could be a lot worse.
03-07-2013, 06:29 AM
#60
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its only time-tell the customer you are having issues
he or she will understand,if they don't you don't want them as a customer
then pull the whole car down ,find out what it is,learn something and next time or if this happens again you guys will know how to fix it in 5 minutes
its also good testing
any pics of the plugs ?
external fuel filter ?
if so is it in the right direction ?
he or she will understand,if they don't you don't want them as a customer
then pull the whole car down ,find out what it is,learn something and next time or if this happens again you guys will know how to fix it in 5 minutes
its also good testing
any pics of the plugs ?
external fuel filter ?
if so is it in the right direction ?