*a*jones*

will this pump work correctly on an N/A without a fuel managment system? I would like to redo my fuel system since it is the only thing that is really left stock.

Ryde _Or_Die

It will fit but you don't need it. Just go for a TII pump.

dr0x

Walbros have been rumored to cause more problems on NA's than they are worth.

silverrotor

iTrader: (1)

I have one but not In the car yet. I'm still debating to nitrous my 7. I wouldn't get one unless you are adding some serious shots. Eitherwise you'll run way to rich. If you do elect to use It, besure to get a fuel manager (s-afc) to lean It out big time.

*a*jones*

suppose the same applies for a TII pump? would the ECU compensate or limit the amount of fuel it pumps

BlackRx7

if you go for a walbro, don't upgrade the injectors..leave the 460s...even with nitrous,,get an SAFC and a wide ban...the only way to tune your car!!!

Aaron Cake

iTrader: (1)

You don't need to upgrade the fuel pump on an NA unless you are making over 250HP.

*a*jones*

thanks man. i'll probably just leave it be then, being a car thats 14 years old with 100k+ on the fuel system i didnt' know if upgrading now would be a good preliminary measure.

AJT

Well, I've had good luck with the 255 on an NA. Last year a friend of mine and I threw together a beater car with parts he has laying around. (In MO coming across second gens is easy, with lots of people buying them and not knowing how to take care/work on them, we get lots of donations). We ran a stock 13b from a junkyard in an 87 base w/ just a RB header and a shitty side exit exhaust. The big thing was an NOS Direct Port Wet kit (jetted for an 80 shot). We were in a rush to make it to a race and didn't put in a new fuel pump. Well, we payed for it. Every pass the car would lean out third gear, pop the intake pipe off the throttle body, and quit. By the 4th run we had dropped the front rotor. We learned our lesson. Picked up a car whose motor had been rebuilt by the owner but he couldn't get it to idle right. He had gotten frustrated and gave the whole car up for $500. We swapped in the new motor along with the 255lph. Even off the bottle the car felt like it had alot more pickup in thrid gear. Best time turned out to be a 13.4 on an ET street. This was with consistent 1.8 60ft's which can be improved upon. We had a real hard launch on the last pass, but ended up breaking an axle.

If it were me, and I wasn't planning on FI, I would get the walbro 190 lph pump. www.autoperformanceengineering.com is a great source for fuel pumps.

And for this year, we're using a TII chassis, streetporting the new motor we had last year, taking some weight out of the car, and running a 175 shot. We may blow it, if we don't we'll try a 200 and blow it then. The nice part about the car is it is just a beater and doesn't take a lot of money. We had ~$800 into the setup last year.

-Andy

*a*jones*

damn thats awesome, all you had was a 80 shot?
did you run anytype of fuel management? i don't really want to blow up my car though, i wouldn't consider it a beater yet.

AJT

There really wasn't any fuel management necessary seeing as how it was an essentially stock motor. The NOS kit give instructions on proper jetting for fuel and nitrous. One big thing is to get a fuel pressure safety switch, something we didn't have on the motor that blew up. You can adjust the switch so that the moment the fuel pressure drops below a certain level it will cut the power to the nitrous. We wired it so that it would read the fuel pressure at a point after where we had tapped the fuel line for the nitrous. This allows us to run relatively safely on the off chance that the injectors don't get enough fuel pressure.

For the new setup for this year, I've got a buddy w/ a Mustang Dyno and a wideband. We're going to haul the car down and make absolutely sure that the jetting is correct and there are no concerns with leaning out. Should be a good time.

-Andy

Bambam7

You won't need the walbro.
It'll get really bad mileage, since rail pressure is higher, the only time you will get the same mileage is when it's in closed loop... which is only during light cruise.
Anyways, you won't need the walbro. I had all the same mods as you and didn't even need the TII pump... not even TII injectors, and I ran 14's.
I've heard some people having prolems starting their cars after installing... since it dumps way more fuel in while cranking.
If you don't have an S-AFC then you may even loose power because of it running richer.

BLUE TII

iTrader: (9)

I know on my '87 TII that the Walbro 255 raised the fuel rail pressure just as Bambam7 said. I guess the stock fuel pressure regulator cannot handle the extra flow of the 255 and so fuel pressure goes up. As a result the car was pig rich at idle and had hard hot starts.

Now *a*jones* said he wanted to re-do the fuel sustem. If you use the Walbro 255 w/ a decent fuel regulator that can mantain a set pressure regardless of flow it would work FINE.

So, if you are re-doing the fuel system (which is a GREAT idea on our older cars) replace the fuel pressure regulator and the failure prone pulsation dampner w/ and aftermarket FPR that includes a PD as well as new fuel lines and pump.