Uprated Fuel Pumps
10 July 2007, 06:04 PM
#121
Scooby Regular
Pete
You have made some very valid points and I agree that an uprated pump is not needed in many circumstances. No standard car should need the pump changing and if they do due to the original one lacking in performance then a standard one is more than acceptable.
ALL Sti PPP cars have a pump fitted and it's not just a case of us fleecing the customer for something that isn't needed. We were hoping to not need one in the first place and haven't charged any more for it either.
No WRX PPP has a pump fitted as it's just not necessary so I guess the 90% figure would be correct if only 10% of Impreza WRX and STi have been modified to over 300hp be that with a PPP or some other mods. Our basic thoughts are that if you have a 2.0 WRX with std injectors, you don't need to uprate the pump but some others may disagree. You need to be led by whoever you are trusting to remap the car, it's their reputation after all!
As part of our PPP development we have spent a lot of time (and therefore money so I'm not about to share the numbers!) characterising the injectors and fuel pumps on a special rig we built to work out what's going on. There is a basic thing that seems to have been missed so far in that the fuel pump may have enough capacity when the cars running std boost and fuelling but normally as you increase performance the boost pressure goes up and hence the regulator ups the fuel pressure to match. The pump then may not be able to flow as much at the new higher pressure, hence you need a new one.
Don't take this the wrong way Pete but think a little about the criticism you have for people modifying their cars. If you don't like how your house is then do you move to the perfect one each time you want to decorate a room, or change the garden, or get sick of the layout of the kitchen? Of course you don't, you change what you've got to make it better for YOU. Nobody has invented the perfect car, just in the same way as they haven't invented the perfect house or the perfect computer.
I do have an uprated pump on my car, but then it does have at least 80bhp more than std.............
Mike
You have made some very valid points and I agree that an uprated pump is not needed in many circumstances. No standard car should need the pump changing and if they do due to the original one lacking in performance then a standard one is more than acceptable.
ALL Sti PPP cars have a pump fitted and it's not just a case of us fleecing the customer for something that isn't needed. We were hoping to not need one in the first place and haven't charged any more for it either.
No WRX PPP has a pump fitted as it's just not necessary so I guess the 90% figure would be correct if only 10% of Impreza WRX and STi have been modified to over 300hp be that with a PPP or some other mods. Our basic thoughts are that if you have a 2.0 WRX with std injectors, you don't need to uprate the pump but some others may disagree. You need to be led by whoever you are trusting to remap the car, it's their reputation after all!
As part of our PPP development we have spent a lot of time (and therefore money so I'm not about to share the numbers!) characterising the injectors and fuel pumps on a special rig we built to work out what's going on. There is a basic thing that seems to have been missed so far in that the fuel pump may have enough capacity when the cars running std boost and fuelling but normally as you increase performance the boost pressure goes up and hence the regulator ups the fuel pressure to match. The pump then may not be able to flow as much at the new higher pressure, hence you need a new one.
Don't take this the wrong way Pete but think a little about the criticism you have for people modifying their cars. If you don't like how your house is then do you move to the perfect one each time you want to decorate a room, or change the garden, or get sick of the layout of the kitchen? Of course you don't, you change what you've got to make it better for YOU. Nobody has invented the perfect car, just in the same way as they haven't invented the perfect house or the perfect computer.
I do have an uprated pump on my car, but then it does have at least 80bhp more than std.............
Mike
Many just follow like sheep and instal one, I am here to make them think twice - or, at the very least, ask for the figures to back up claims which are just thrown about *****, nilly
Your analogy regarding the house doesn't really stack up in many cases - but well tried
Some of the Mods I see discussed on ScoobyNet are similar to buying a nice brick built house, knocking it all down and building a straw house in it's place - the first puff of wind and it all comes tumbling down!
Subaru do not extract 400 BHP out of a stock Impreza because the higher the BHP the more unreliable it becomes - it's simple maths really.
But thanks for the very valuable input
Anyone have any DATA or Figures yet?
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