fuel pump Upgrade ?

[vxr2010]

Any one got any thoughts please , I've found a very good price on the mapping with FB Tuning , the car is a jdm sti ver 7 2001 bugeye , I have changed the plugs and panel filter it has original cat down pipe after that I have a straight through pipe and sports box , I'm only looking for a standard remap car is on 85k miles , do you have to upgrade fuel pump or is it advised ? It's a budget issue lol

[vxr2010]

Hi cheers for replies , I'm assuming fuel pressure can be measured when mapping ?

[vxr2010]

One warlbro ordered , but do I fit in the Foz sti with 125,000 or the Impreza with 87,000 miles , the last chap who mapped the car said I did not need one, so its more of an age or mileage covered issue, both basic mods as in cat back and a basic remap , expensive sorting two Scoobys out

[vxr2010]

Unfortunately Foz already done and Impreza due , and now it's getting to buying Xmas present time , oh a warlbro from the Mrs I hope

[vxr2010]

Good old eBay , I've bought a fuel pressure guage it was only 12£!, I think its supposed to be around three bar , I will see how the pressure is and therefore how worn the pump is

[vxr2010]

I bought a walbro 255 on eBay , both are Sti s , at least I can pressure check them , lowest pressure gets the new pump now and if other car is too low then a new one on that too if it needs doing , the boost will be higher on the sti Impreza as a larger turbo , it's surprising how different the 2 and 2.5 litre sti s drive

[vxr2010]

Foz has much smaller turbo it's only a vf39 which is why there is less lag but lower boost its Max's around 1.25 to 1.3 and that's after mapping , the Impreza is peak 1.4 to 1.5 in higher gears and it's not been mapped yet , Subaru went bigger cc smaller turbos

[vxr2010]

Yup my error the vf41 I could not remember which one , power is more instant on Foz it just runs out quicker , it was as quick as or possibly quicker than my friends 2.5 spec d that was remapped so no slouch

[vxr2010]

Any one got any idea ? I've put the guage on it showed about 10 psi on idle on both cars is that normal , I assume pump works harder when it needs to , no cel or any thing else showing up , my thoughts are why change what's working plus the cost of doing two of them

[vxr2010]

I think I connected it wrong seems I need to stop return fuel pressure to find out what it's actually doing , a job for tomorrow

[vxr2010]

Well finally all done , both have around 43 psi which goes up when fuel rail regulator is disconnected , so that is peace of mind , plus I have a walbro that should do either one if I need to , I'm going with don't touch it if it's not broken fuel pump idea , one has highish mileage around 130,000 miles , the other is age it's a 2001 car but neither has currently effected the fuel pump working , on the plus side I needed to change two fuel lines that were not that obvious with out closer looking , guage was about 12 £ to my door via eBay , and you need ptfe tape to seal joints on the guage , and connect it between the fuel filter out and the in line to the fuel supply which is the top one of the three , but if nothing else check your fuel lines