Did a lil searching but couldnt find the answer i wanted...s4 N/A is good for "250" just wondering how much a tii's could handle safety without running lean

advice is appreciated...

Aaron

 

I used the stock one, and made 240whp, it will work, but just change it, it's safe insurance. At least rewire the fuel pump <- search for that.

Edit: You are expecting to make 250 hp with an N/A? If you can afford that, I'm sure you can afford a walbro or a minimum FD pump.

 

yeah i'll be getting very close to 250..i had an FD fuel pump but sold it but now im back on the market.

You had no problems running what 280ish crank hp with the n/a pump?? nice to see that.

 

NO I made roughly 280 flywheel HP with a STOCK TII pump. I wouldn't use the N/A pump for even a stock Tii.

How are you planning on acheiving this 250hp?

 

haha thats what i thought just making sure.

Supercharger.

 

You are just going to bolt a supercharger on the car? I am sceptical on the ability for a supercharger to do it.

 

to do what??

running 7psi with 550's should be roughly 200's...im not expecting 250 with just those but mainly just wondering how much hp the fuel pump's in fc's can handle..incase i need to upgrade that too, playing it safe.

 

I dunno where you get your numbers from, but it's more like 200 for the non-turbo, and 240 for the turbo one.
Those are at the wheel off a DynoJet.


-Ted

 

FAQ it says n/a's run rich. "250" fph. I'm expecting 230 fhp with an FD fuel pump and maybe 720 secondaries now, and more like 190ish rwhp...dont want too argue just wanted an answer...

Aaron

 

just upgrade to a walbro. its cheaper in the long run. i wouldnt put my engine fate in a 20 year old pump
my $.02

 

The problem with the Walbro is that it flows so much fuel it will overwhelm the stock FPR and cause the fuel pressure to rise. The car will then run very rich...

You can fix then by using an aftermarket FPR which you would probably be doing anyway with the supercharger.

The FD pump is cheap and will support those power levels easily. And it's a direct fit without causing any real pressure problems.

 

thks for all the info. i wanna start out running low boost anyway, so i likely wont need a walbro or supra fuel pump any time soon or until i get it tuned right and have min. problems.

 

250bhp at the flywheel minus 15% is ~212hp (at the wheels).
It's close enough.


-Ted

 

i saw the T2 pump running out of steam at about 260RWHP, it dropped about 10 psi and was unsafe to continue tuning with it so safely i would probably say about 250RWHP with the T2 pump, even that is a bit inflated for a safe limit considering the pressure drop i was seeing.

normal pressure under boost was ~50PSI, near the end of the RPM range it was at 40PSI and dropping still, luckily i have an EMS or a piggyback might not have been able to compensate very well.

 

fd pump will fit your needs... plus it doesnt make the noise a walbro does