cloneman315
Active member
Re: Local HELP PLEASE
was the truck running right before the chip?ignition right?
was the truck running right before the chip?ignition right?
Local HELP PLEASE
- Thread starter RJE 93Green/Tan
- Start date
RJE 93Green/Tan
ty high on psi
Re: Local HELP PLEASE
Before the 50# chip and injectors, I had an stg chip for stock injectors. It ran good, the a/f ratio was normal until the boost came in (only 12lbs) then it would gradually get leaner. So we thought that the stock injectors werent supplying enough fuel, so I changed to the 50# chip and injectors. When I bought the truck the owner gave me these injectors and chip.
Before the 50# chip and injectors, I had an stg chip for stock injectors. It ran good, the a/f ratio was normal until the boost came in (only 12lbs) then it would gradually get leaner. So we thought that the stock injectors werent supplying enough fuel, so I changed to the 50# chip and injectors. When I bought the truck the owner gave me these injectors and chip.
BoostedSUV
Active member
Re: Local HELP PLEASE
If you're leaning out under boost I would suspect fuel pump. Do you have a 255 walbro and AFPR in the truck? If not the stock fuel pump or a weak fuel pump will not pump enough fuel supply for the 50# injectors in boost.
If you're leaning out under boost I would suspect fuel pump. Do you have a 255 walbro and AFPR in the truck? If not the stock fuel pump or a weak fuel pump will not pump enough fuel supply for the 50# injectors in boost.
RJE 93Green/Tan
ty high on psi
Re: Local HELP PLEASE
It has a 255 walbro, under boost the fuel pressure goes to about 50lbs.
It has a 255 walbro, under boost the fuel pressure goes to about 50lbs.
BoostedSUV
Active member
Re: Local HELP PLEASE
50lbs is not enough... what is your base fuel pressure set at (vac line off, truck running?) With my 50#ers I had my base set at 50psi and at 15psi of boost I would have 65lbs of fuel pressure. You should have 1 lb of FP increase for every 1lb of boost over your base FP setting....
50lbs is not enough... what is your base fuel pressure set at (vac line off, truck running?) With my 50#ers I had my base set at 50psi and at 15psi of boost I would have 65lbs of fuel pressure. You should have 1 lb of FP increase for every 1lb of boost over your base FP setting....
RJE 93Green/Tan
ty high on psi
Re: Local HELP PLEASE
at idle its at 20lbs and when the truck started to move the dyno(not into boost yet) it got so rich the a/f meter couldnt read it, this is at 50lbs of fuel pressure. does it make a difference if a vac line is off when you sent the fuel pressure?
at idle its at 20lbs and when the truck started to move the dyno(not into boost yet) it got so rich the a/f meter couldnt read it, this is at 50lbs of fuel pressure. does it make a difference if a vac line is off when you sent the fuel pressure?
BoostedSUV
Active member
Re: Local HELP PLEASE
20lbs at idle is also too low. It should be around 30-35lbs at idle. The vac line doesn't have to be off in order to adjust fuel pressure but in order to set the "base" fuel pressure the truck should be running with the vacuum line to the AFPR off and plugged. Set it to about 45psi. (to start) and then reconnect the vac line. With the truck Idleing it should be about 32psi and with 15psi of boost you should be around 60lbs with that 45lb "base" setting.
20lbs at idle is also too low. It should be around 30-35lbs at idle. The vac line doesn't have to be off in order to adjust fuel pressure but in order to set the "base" fuel pressure the truck should be running with the vacuum line to the AFPR off and plugged. Set it to about 45psi. (to start) and then reconnect the vac line. With the truck Idleing it should be about 32psi and with 15psi of boost you should be around 60lbs with that 45lb "base" setting.
RJE 93Green/Tan
ty high on psi
Re: Local HELP PLEASE
Ok I will try that thanks
Ok I will try that thanks
RJE 93Green/Tan
ty high on psi
Re: Local HELP PLEASE
I have stock chip piggy backing the 50# chip, I have a pitpull chip for 37#. Would it make a difference if I use that instead of the stock chip or the piggy back?
I have stock chip piggy backing the 50# chip, I have a pitpull chip for 37#. Would it make a difference if I use that instead of the stock chip or the piggy back?
BoostedSUV
Active member
Re: Local HELP PLEASE
shouldn't matter which chip you're using as a piggyback. The functions that are being used still will be the same. Are you sure you have it piggy backed the correct way? It should be piggybacked in the same position it came out of the ECM.
RJE 93Green/Tan
ty high on psi
Re: Local HELP PLEASE
Im 99% sure its in right.
Im 99% sure its in right.
BoostedSUV
Active member
Re: Local HELP PLEASE
it should look like this.. I borrowed from another post.
it should look like this.. I borrowed from another post.
RJE 93Green/Tan
ty high on psi
Re: Local HELP PLEASE
Pretty sure it looks like that but I'll make 100% sure tomorrow
Pretty sure it looks like that but I'll make 100% sure tomorrow
RJE 93Green/Tan
ty high on psi
Re: Local HELP PLEASE
When I looked at the chip, the stock chip was flipped( when you look at the picture above, the brown part of the stock chip was on the right). Sorry for asking such a stupid question, but would that make a difference?
When I looked at the chip, the stock chip was flipped( when you look at the picture above, the brown part of the stock chip was on the right). Sorry for asking such a stupid question, but would that make a difference?
BoostedSUV
Active member
Re: Local HELP PLEASE
That is definitely wrong and I would bet is your problem. Flip it over!
That is definitely wrong and I would bet is your problem. Flip it over!
BoostedSUV
Active member
Re: Local HELP PLEASE
And do what I said about fuel pressure.. Set it to 45 to start and see where you're at. You may need to go to 50lbs. Trust me your FP is too low as it is now. The chip being in backwards is what's causing your fueling issues. :tup:
And do what I said about fuel pressure.. Set it to 45 to start and see where you're at. You may need to go to 50lbs. Trust me your FP is too low as it is now. The chip being in backwards is what's causing your fueling issues. :tup:
RJE 93Green/Tan
ty high on psi
Re: Local HELP PLEASE
Well that make me feel a little bit better, going to take it for a ride in a minute. I really appreciate your help!!
Well that make me feel a little bit better, going to take it for a ride in a minute. I really appreciate your help!!
BoostedSUV
Active member
Re: Local HELP PLEASE
No problem! Glad I could help... After your ride let us know how you made out. I would be willing to bet you'll be close to where you need to be... :tup:
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RJE 93Green/Tan
ty high on psi
Re: Local HELP PLEASE
The truck started, and once I got the fuel pressure with the vac line off to about 35 and it was running really really rough. So wanted to make 100% sure the the stock chip was right and it is.
The truck started, and once I got the fuel pressure with the vac line off to about 35 and it was running really really rough. So wanted to make 100% sure the the stock chip was right and it is.
RJE 93Green/Tan
ty high on psi
Re: Local HELP PLEASE
Well I hate to say it but I'm not going to make PINKS this weekend
, but I still would like to find a solution to this problem.
Well I hate to say it but I'm not going to make PINKS this weekend
, but I still would like to find a solution to this problem.