when to upgrade pump
Thread Starter
On The Tree
Joined: Jan 2006
Posts: 129
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when to upgrade pump At what hp level do you replace the fuel pump?how many hoses can the stocker take.the reason I am asking is that ive got MTI lid lt hedders,loudmouthand in acouple of days a TR224 112lsa cam is going in I know at that level (I shoul be under 400rwhp dont know til after dyno tuning)I will be o.k. on the stock pump,but am getting agood deal on zex 75-125 kit and I was think of spraying a75 shot depending what my mods and the cam put down so can someone please tell me what hp level the stock pump is good till?
thanks john
thanks john
Thread Starter
On The Tree
Joined: Jan 2006
Posts: 129
Likes: 0
slow trap
lets say with the cam and mods I have I put down 360 hp to the wheels and I do a75 shot (total would be around 435 to the wheels do you think Ill be ok with the stock fuel pump or is that pushing it ?
lets say with the cam and mods I have I put down 360 hp to the wheels and I do a75 shot (total would be around 435 to the wheels do you think Ill be ok with the stock fuel pump or is that pushing it ?
You might consider upgrading it. Your on the line, we recently had a '98 in with just bolt ons and a 100 shot and the FP droped down to 30 ish PSI. Fuel pumps are less then new motors. 
Matt
Matt
Originally Posted by Matt@HSW
You might consider upgrading it. Your on the line, we recently had a '98 in with just bolt ons and a 100 shot and the FP droped down to 30 ish PSI. Fuel pumps are less then new motors.
Matt
Matt
Thats some good advice there.
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It would be a good idea for sure. But FWIW I had a 225 cam AND dry shot on my previous A4 car. I ran the 125 shot jets and I just swapped out to 37lb injectors, but stock pump. Everything was fine.
With my current car I have made 457rwhp with the stock injectors and pump with the same NOS 5177 kit. A/F was in the 11s on the juice.
With my current car I have made 457rwhp with the stock injectors and pump with the same NOS 5177 kit. A/F was in the 11s on the juice.
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We use the Racetronix kits so the full functionally of the factory fuel system is retained. A Walbro pump will work, but you'll have to hack your pump bucket up and loose the venturi system. You might want to try a search of the pro and cons of both pumps as there is a good amount of info on this board. Inline pump is just a band aid, and could cause fuel pump cavitation in your intake pump. Labor will vary, we charge $175.00 for the Racetronix kit install. Here is a link to some Racetronix kits:
http://www.harrisspeedworks.com/shop/home.php?cat=330
Matt
http://www.harrisspeedworks.com/shop/home.php?cat=330
Matt
