New converter and smaller pulley. Maxed out fuel pumps.
#1
Staging Lane
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Ok so we got the car back together in February this year.
Setup is
Ls3 418, afr heads
Stage 2 snow meth kit
D1sc
Stage 7 flt 4l65
Moser 12 bolt.
So we strapped it on Geoff dyno at eps after build.
Car made 660 rwhp at 6200 rpm. With air/fuel 11.4 with meth 18*. That was on 9 1/2 -10 lbs of boost. Stock converter. 93 pump gas.
So last week we installed FTI triple disk billet converter,10.5" 3000!
And drop down from a 3.4 pulley to a 3.2 on blower.
So last weekend I got her back on dyno. Made about 12 lbs of boost and at 4700-4800 rpm the fuel pump couldn't keep up. Car made 650 rwhp at 4,700. Same air/fuel .
I built the whole fuel system on car except at the tank. I was told it was dual pumps when I bought car from Colorado speed, and that was all. So I always assumed it was 255s. With my fuel system( 8an feed line, 6an return, rails, boost regulator, 60lb injectors) I should have enough fuel if its 255s.
My next step is drop the tank and find out exactly what's back there.
My question is what's some good in tank pumps? I was told aeromotive 340s?? Goal is to be around 720ish
Setup is
Ls3 418, afr heads
Stage 2 snow meth kit
D1sc
Stage 7 flt 4l65
Moser 12 bolt.
So we strapped it on Geoff dyno at eps after build.
Car made 660 rwhp at 6200 rpm. With air/fuel 11.4 with meth 18*. That was on 9 1/2 -10 lbs of boost. Stock converter. 93 pump gas.
So last week we installed FTI triple disk billet converter,10.5" 3000!
And drop down from a 3.4 pulley to a 3.2 on blower.
So last weekend I got her back on dyno. Made about 12 lbs of boost and at 4700-4800 rpm the fuel pump couldn't keep up. Car made 650 rwhp at 4,700. Same air/fuel .
I built the whole fuel system on car except at the tank. I was told it was dual pumps when I bought car from Colorado speed, and that was all. So I always assumed it was 255s. With my fuel system( 8an feed line, 6an return, rails, boost regulator, 60lb injectors) I should have enough fuel if its 255s.
My next step is drop the tank and find out exactly what's back there.
My question is what's some good in tank pumps? I was told aeromotive 340s?? Goal is to be around 720ish
#4
Staging Lane
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That's why I was thinking one must be getting weak. I have it on a hoobs switch. But during pull fuel stays around 58-60 and as soon as we hit 4700ish pressure drops to 40 quick! Pumps are getting close to 8 yrs old.
#5
UNDER PRESSURE MOD
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I personally have Lonnie's twin in tank 255s, and I'm having the issue where I'm maxing out my 60's injectors due to using the factory regulator. I need to switch over to a 1:1 boost refererenced regulator at this stage, but my at-rail pressure stays in the high 50's low 60's throughout the rpm range.
Last edited by The Alchemist; 05-24-2013 at 07:11 AM.
#6
Staging Lane
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Good suggestion @alchemist.
My next step is to get the tank out and see exactly what I have back there. Cars been at 10 lbs for years and fuel has always been enough after I did lines and rails etc...
Now at 12 lbs and pump issues...Just trying to get some options on pump choices . One day I may upgrade to a f1a so
My next step is to get the tank out and see exactly what I have back there. Cars been at 10 lbs for years and fuel has always been enough after I did lines and rails etc...
Now at 12 lbs and pump issues...Just trying to get some options on pump choices . One day I may upgrade to a f1a so
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#9
Launching!
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Good suggestion @alchemist.
My next step is to get the tank out and see exactly what I have back there. Cars been at 10 lbs for years and fuel has always been enough after I did lines and rails etc...
Now at 12 lbs and pump issues...Just trying to get some options on pump choices . One day I may upgrade to a f1a so
My next step is to get the tank out and see exactly what I have back there. Cars been at 10 lbs for years and fuel has always been enough after I did lines and rails etc...
Now at 12 lbs and pump issues...Just trying to get some options on pump choices . One day I may upgrade to a f1a so
#11
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I know very few people that recommend not running individual feed lines on higher HP FI builds.
How smart does it sound to feed on rail/injectors and then cross over to the other side with whatever is left? That is why you see a lot of cars go lean on one side and no the other side.
FPR location/issues can also cause the same situation.
How smart does it sound to feed on rail/injectors and then cross over to the other side with whatever is left? That is why you see a lot of cars go lean on one side and no the other side.
FPR location/issues can also cause the same situation.
#12
UNDER PRESSURE MOD
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I know very few people that recommend not running individual feed lines on higher HP FI builds.
How smart does it sound to feed on rail/injectors and then cross over to the other side with whatever is left? That is why you see a lot of cars go lean on one side and no the other side.
FPR location/issues can also cause the same situation.
How smart does it sound to feed on rail/injectors and then cross over to the other side with whatever is left? That is why you see a lot of cars go lean on one side and no the other side.
FPR location/issues can also cause the same situation.
I think it would make sense to run one larger line to the FPR, then use a 'y' and feed each rail.
Currently, I'm running off the factory fpr in the tank, then I come into the back of the driver's side rail, cross over in the front, then feed the passenger side. I have my fuel pressure sensor at the back of the passenger rail, so it sees the lowest pressure. I guess I should switch my wideband over to the passenger side to make sure I'm not running lean.
#13
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Definitely run two feed lines and a 1:1 regulator.
Here is my setup:
*First off, use a fuel log/fuel block to tie fuel feeds together. Mine is a 5 port log.
*LPE 225 lph intank pump (primary) on a hot wire kit, using the stock fuel line that is feeding one port on the fuel log.
*Bosch 044 external, running on a KB Boost a Pump and Hobbs switch. It is feeding thru its on -8an line to the fuel log.
*Each fuel rail is fed on separate lines from the fuel log and they cross over to each other up front
*The last port on the end of the fuel log goes to the fuel pressure regulator, then out of the regulator back to the tank.
![](http://img.photobucket.com/albums/v245/ZXALAN/Z06/1AD1D674-2127-4F96-A7D3-35C5F3A35847-1115-000003668C5BAC7A.jpg)
I'm also using an Alky control kit with dual nozzles so I do get some fuel supply from that but... With both systems in place, I made 900rwhp (with the stick) and only 78% DC on the Fic 1000s. Fuel pressure is 1:1 referenced. At 7000 rpms I see 77 psi of fuel pressure.
No doubt I could easily feed 1000-1050rwhp with this setup.. It's very simple and very reliable.. Runs around on one single, intank pump like stock.
Here is my setup:
*First off, use a fuel log/fuel block to tie fuel feeds together. Mine is a 5 port log.
*LPE 225 lph intank pump (primary) on a hot wire kit, using the stock fuel line that is feeding one port on the fuel log.
*Bosch 044 external, running on a KB Boost a Pump and Hobbs switch. It is feeding thru its on -8an line to the fuel log.
*Each fuel rail is fed on separate lines from the fuel log and they cross over to each other up front
*The last port on the end of the fuel log goes to the fuel pressure regulator, then out of the regulator back to the tank.
![](http://img.photobucket.com/albums/v245/ZXALAN/Z06/1AD1D674-2127-4F96-A7D3-35C5F3A35847-1115-000003668C5BAC7A.jpg)
I'm also using an Alky control kit with dual nozzles so I do get some fuel supply from that but... With both systems in place, I made 900rwhp (with the stick) and only 78% DC on the Fic 1000s. Fuel pressure is 1:1 referenced. At 7000 rpms I see 77 psi of fuel pressure.
No doubt I could easily feed 1000-1050rwhp with this setup.. It's very simple and very reliable.. Runs around on one single, intank pump like stock.
#18
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So are you saying to run two separate fuel lines from the tank, one for each rail? I've never heard that before.
I think it would make sense to run one larger line to the FPR, then use a 'y' and feed each rail.
Currently, I'm running off the factory fpr in the tank, then I come into the back of the driver's side rail, cross over in the front, then feed the passenger side. I have my fuel pressure sensor at the back of the passenger rail, so it sees the lowest pressure. I guess I should switch my wideband over to the passenger side to make sure I'm not running lean.
I think it would make sense to run one larger line to the FPR, then use a 'y' and feed each rail.
Currently, I'm running off the factory fpr in the tank, then I come into the back of the driver's side rail, cross over in the front, then feed the passenger side. I have my fuel pressure sensor at the back of the passenger rail, so it sees the lowest pressure. I guess I should switch my wideband over to the passenger side to make sure I'm not running lean.
It was 5AM when I posted it though!
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Y it into the rails.