Just wondering what fuel pumps you guys who are running over 300whp are using?
if you have the part number even for the pump that would be awesome
The First Twin Charged jbody
blue car (R.I.P) - 240whp @7psi..
silver car - 305whp 315lbs.tq @15psi (91 Octane) or 420whp & 425lbs.TQ @20psi (94 octane+Alcohol Injection)
All dynos run on a Mustang dyno
I run the walbro 255 HP/HF, hot wired at 71psi on 11psi for 280whp, at that pressure the pump has issues keeping up.
HP Tuners | Garrett T3/T04B | 2.5" Charge Pipes | 2.5" Downpipe | 650 Injectors | HO Manifold | Addco front/rear | Motor Mounts | HKS SSQV | Spec stage 3 | AEM UEGO Wideband | Team Green LSD | FMIC | 2.3 cams | 2.3 oil pump swap | 280WHP | Now ECOTECED
Im running the blazer pump, mine is also hotwired
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ
Hotwired in-tank Walbro as well; switching to an external this season, though. I want that massive "whine" the in-tank doesn't give me
^^lol Ill probably be adding an external, or at least an inline here real soon as well.
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ
david does that blazer pump drop right in with no fuel cup cut? whats this hot wire you guys speak of? also know the flow rating on the blazer pump? i need a lift pump for my surge tank system
R.I.P. Brian Klocke, you will never be forgotten
i have used a upgraded W-body pump with an inline..no problems @65psi FP
Built&Boosted moar
04 Cavalier Turbo r.i.p my baby
2nd place 2009 GM tuner bash qwick 8--holla
I have a Walbro 255 and an MSD inline.....
P&P Tuning
420.5whp / 359.8wtq
Boosted2point4 wrote:david does that blazer pump drop right in with no fuel cup cut? whats this hot wire you guys speak of? also know the flow rating on the blazer pump? i need a lift pump for my surge tank system
GM doesn't run a full 12volts to their fuel pump, so it doesn't run full-bore like it could. Hot-wiring it to a switch or ignition gives it a full 12-volts and assures that's it's always supplying more than enough fuel, esp. for boost.
I wired mine to a switch and tell people if they can figure out how to START my car, they can drive it.
Id be willing to bet that on a WOT pull that number jumps right to 12. if anyone has a DMM (me) and a working cav (not me) they could check this real quick. and if thats the case wouldnt that make this pointless? However a switch is pretty nice, it can help deter crooks.
also does anyone know the limitations of an inline VS a drop in. and are the numbers you guys refering to all LPH?
and if so does anyone have a conversion for LPH to HP
sorry one more. does an inline simply build on the rating of the stock unit? for instance 250 stock intank with a 50 lph booster equal 300 lph?
it cant be that simple.
"
Kick azz is my boost hero!!! 
"
Good post...I'm listening.
2010 Subaru Impreza WRX Limited
1999 Cavalier Z24 Supercharged
1999 Grand AM SE (Beater Car)
1997 GMC Sierra
2007 Honda CBR 600RR
2005 Honda TRX450R
Agent Omega wrote:Boosted2point4 wrote:david does that blazer pump drop right in with no fuel cup cut? whats this hot wire you guys speak of? also know the flow rating on the blazer pump? i need a lift pump for my surge tank system
GM doesn't run a full 12volts to their fuel pump, so it doesn't run full-bore like it could. Hot-wiring it to a switch or ignition gives it a full 12-volts and assures that's it's always supplying more than enough fuel, esp. for boost.
.
Brandon the pump dropped right in, but we cut the cup just to make sure that I can get the most fuel as possible., but yes you can drop it it without cutting.
I also agree with Agent Omega in this quote.. We hotwired it to make suer I get enough fuel at all times..
Jcavi, your right about the WOT it will jump up to 12 volts, BUT the problem I was having is at idle I was going lean because the WALBRO pump was shutting down.. Thats the Main reason mine is hotwired to try and prevent that from happening.. So far, I havent had any problems with this Blazer.
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD
AUTOMATIC!!
328 HP
306 TQ
what happens with the pumps and poor wiring is that the voltage is lower at idle, mine was 13.2 IIRC, and when I went up front and pulled the vacuum line off the FPR on the rail the voltage dropped to 12.1 volts, so I hot wired it to maintain 13.2 and it worked and fixed my misfire issue.
Don't both cutting the cup for the 1/4 tank fix, you can buy a piece or mod your pump to run that stock fuel "venturi" to fill the cup all the time. Just search, I posted pics and some others have posted links on the brass fittings to buy.
HP Tuners | Garrett T3/T04B | 2.5" Charge Pipes | 2.5" Downpipe | 650 Injectors | HO Manifold | Addco front/rear | Motor Mounts | HKS SSQV | Spec stage 3 | AEM UEGO Wideband | Team Green LSD | FMIC | 2.3 cams | 2.3 oil pump swap | 280WHP | Now ECOTECED
I was going to ask if the blazer pump has the little hose to fill the cup....I guess that answered my question.
ge_force, if I remember your method was rather complex.....drilling through bolts and such. I also heard about a fix for the GTP, which needs the same thing, but I do not remember the details. If you still have your pics, or links to the others I know I would appreciate them.
I want to run some type of upgraded pump as well as the MSD inline I have.
Jcavi, as far as I know (feel free to correct me) an inline BOOSTER pump such as the MSD I am running is only meant to up the fuel pressure, so it doesn't fall on its face in the high end. It can not outflow the pump supplying it.
msd inline from the hahn kit. stock intake. no problems.
12.5@116 2.0 60ft
what year blazer pumps do you guys use??
I'm using my stock jbody with a static fp of 25psi, even at 12lbs of boost it only jumps to 37psi, and does not have trouble keeping up...... (honestly) When I'm romping on it for a long time, I turn my inline MSD on (255lph)
would doing a simple drop in blazer pump and in-line msd pump get the job done for say 300whp? no hot-wiring or modding the in-tank pump whatsoever....
^^^^wouldn't doing a drop in blazer pump BE modding the in tank??
The blazer pump indicated in the FAQ looks like it does not look like the blazer pump has the extra port to fill the cup, so you would still have to cut the cup.
I want to know what the stock pump and inline pump are going to be good for....
Blazer pump, cut cup, double sided sock on the pump... I get no fuel cut until 1/16th tank, no hot wiring.
This has taken me to 22 psi on 1000cc injectors.
-Chris-
-Sweetness-
-Turbocharged-
Slowly but surely may some day win this race...
John Benham wrote:I was going to ask if the blazer pump has the little hose to fill the cup....I guess that answered my question.
ge_force, if I remember your method was rather complex.....drilling through bolts and such. I also heard about a fix for the GTP, which needs the same thing, but I do not remember the details. If you still have your pics, or links to the others I know I would appreciate them.
I want to run some type of upgraded pump as well as the MSD inline I have.
Jcavi, as far as I know (feel free to correct me) an inline BOOSTER pump such as the MSD I am running is only meant to up the fuel pressure, so it doesn't fall on its face in the high end. It can not outflow the pump supplying it.
the MSD is gravity fed and can be run by itself, therefore it can outflow the pump supplying it. Why waste your time dropping the tank and modding the blazer pump when all the factory pump needs to do is supply the MSD and it does all the work.
good to know.....
MSD inline is all the fuel pump I am going to start with at least
Perhaps because I don't like to hear a chainsaw turn on under the car when I go into boost lol. Those pumps are loud... and if they fail or you mange to overwork them by mistuning your FMU and not paying attention to pressure then you are suddenly very lean.
Why have a redundant pump on the car when it's 1.5 hours work to remove the tank and put in a decent in-tank pump that can do the job by itself, function quite well, and be damn quiet doing it without the hassle of extra wiring and relays?
As I said... the Blazer handled 22 psi of boost through a T3/T4 turbo on a heavily modded engine and was providing an 11.8:1 afr. Most J-bodies won't see this kind of boost or those kinds of fuel needs... I only know of two other people that have run 1000cc injectors.
In-tank pump is just fine, and not as hard to replace as some people make it seem. The ONLY real reason I see why anybody would need/want an external pump is because they don't want to drop the tank or they want to be able to put it back to some-what stock afterward.
-Chris-
-Sweetness-
-Turbocharged-
Slowly but surely may some day win this race...
^^^ i was just asking why do both? so does anybody actually know the flow rate of the blazer pump? has anyone actually had the stock pump physically not able to keep up? if stock blazer pumps can do it, how much more are they flowing than the stock J's?
