Fuel Pump for VTS turbo conversion - Saxperience

e8_pqck · 25th February 2011, 01:02

Will the standard fuel pump be ok for a boosted VTS?

Running megane 225 injectors with apx 12psi on a T25 (2xHG) with a standard 3 bar FPR. Predator ECU.

None of the turbo posts seem to mention fuel pump upgrades. I used to run a walboro 255 on my GT-Four @ 400hp, surely this would be too much for 1.6 running 220bhp or so.

ryanmt · 25th February 2011, 08:20

It's regulated by the fpr anyway so you can use a walbro if you wanted. Pretty decent value for monwy those pumps too.

I would expect those injectors to max out before you hit 12 psi though. Try get a 4 bar at least

axsaxoman · 25th February 2011, 08:44

injectors will be far too small for steady fueling ,never mind the extra you need for acceleration fuelling on a turbo
490cc is correct size .
std fuel pump is not an issue at that power level --but no downside to fitting larger one
we can supply you 3 different type of 490cc pico injectors

genuine pico 069=£79.20 each
non genuine pico 069=£36.00 each

or the best choice 12hole genuine pico iwp 189 =£84.00
the 12hole pintel gives much better atomisation ,

run these at 4.5 bar and the flow will be 550cc--but delivery like a small injector

all prices inc vat

yr51ocw · 25th February 2011, 11:35

the problem with fitting an OTT fuel pump, is that you will be putting undue heat into the fuel. Probably wont be noticeable at this level of tune but something to think about.

e8_pqck · 26th February 2011, 00:57

Megane 225 as in R26 (225bhp). They are more than enough to handle this application and far better than the pencil jet pico's as these provide a shower pattern, also half the price at £165 a set brand new from worldofparts.

Is the standard feul pump suitable? or do i need a better one?

e8_pqck · 26th February 2011, 01:00

Am i right in thinking pressure is not the issue but flow rate?

axsaxoman · 26th February 2011, 11:18

my mistake I wa reading post as 225cc flow rate --which is flow rate of std saxo vts injectors.s
what is flow rate of the megane units --or better still the part no.
have you used these in a saxo --the megane ecu may pulse twice in a firing squence--If they are pico --then there will be an IWP no. on the side of them+ a colur coded ring

axsaxoman · 26th February 2011, 11:26

Quote:

Originally Posted by e8_pqck

Am i right in thinking pressure is not the issue but flow rate?

yes both are linked though ,you can,if just on the edge of injector size lift the pressure to make it work ,
can you tell me the IWP no. on your injectiors i can tell you the size then

e8_pqck · 26th February 2011, 20:05

They are siemens deka. I believe they are 480cc. They are the short type and fit straight into the rail.

http://www.worldsaparts.co.uk/megane...injectors.html

Dave_P · 26th February 2011, 20:25

You'll probably need a swirlpot & 2nd pump too.

e8_pqck · 27th February 2011, 02:50

Quote:

Originally Posted by Dave_P

You'll probably need a swirlpot & 2nd pump too.

why?

People have been using these injectors in saxo's with no problems.

Gareth_R · 27th February 2011, 18:15

How would you go about fitting a walbro and what one would you get?

atspeedracing · 27th February 2011, 18:47

the walbro 255 is a direct replacement in tank pump upgrade.

generally you only need to upgrade to swirl pot and secondary pump set up if you use the car on track, or suffer with any fuel surge problem.

before my swirl pot, i used to get fuel surge under acceleration if i had less than 1/4 tank of fuel.

- colin.

Gareth_R · 27th February 2011, 19:10

I can only find direct replacement for ford and gmc cars?

e8_pqck · 28th February 2011, 13:09

so, to recap then.

I dont need an uprated fuel pump for this power level, the 480cc injectors will flow enough with this setup. however, it wouldn't hurt to have a new pump, say the walboro.

Out of interest, what is the flowrate and pressure of the VTS pump? i actually have an AX GTi pump which i am told flow slightly more, but this is an AX conversion of course.

maddison_vts · 28th February 2011, 13:28

i use a standard fuel pump, it will get surge if i have less than 1/4 tank of fuel. The simple solution is run with over half a tank of fuel.

That's what I do and I don't have any problems.

atspeedracing · 28th February 2011, 13:31

the pumps are only like £80. so not even worth messing about really. cheap, reliable and suitable for almost anything you will throw at it.

http://atspeedracing.co.uk/products/...products_id=50

"direct replacement" we usually trim down the plastic connect on the pump, and make the electrical connector on one side smaller, this way the stock 106/saxo wires fit, making it a very simple install. it even comes with small length of fuel hose and 2 clips.

tip: make sure the hose clips are tight and dont leak.. this can cause many hours of "where the hells the fuel pressure going!?" on the dyno, as one of my customers found out lol.

- colin.