Hey guys,

So my fuel pump is bad. I currently have the stock 93 fuel pump (car is mostly stock). I plan to undergo a single turbo conversion in the future, just trying to save up the money. Anyways for the time being I thought I might as well upgrade the fuel pump. I have seen a couple of forums where people debate between the Walbro 255 and the Denso Fuel pump sold on the rx7.com website. So I have a couple of questions, Is my stock ECU compatible with these fuel pumps, or will there be any issues? Will I need to upgrade my ECU? Tune the car? Upgrade Fuel injectors? etc.. Any help will be greatly appreciated, Thanks!

 

Get the Denso Supra TT pump. Walbro is doo doo (I have 2 in my fuel system). As a general rule of thumb, you should definitely get a PFC or aftermarket ECU (check w/ whoever is tuning your car for which to get). PFCs can be had on the classifieds here for still-reasonable, if not good, prices.

 

First off, the Walbro is a good pump. IF YOU GET A REAL WALBRO PUMP. There are a TON of fakes out there, that's where the problems have come from.

Banzai Racing is a good place to order the pump from, they get them direct from Walbro and are 100% legit. They are a straight forward install.

The Denso Supra pump is OK but it isn't amazing. The Walbro can handle more power and it's a similar price if not cheaper. I've had a Walbro 255 in my car for 10-12 years with zero problems.

All that said, OEM pumps RARELY fail. You need to figure out what happened. Have you pulled the pump to look at it? How do you know it's bad and it's not an electrical issue? is the tank rusty?

You won't need to do anything with your ECU. The fuel pressure regulator will keep things at the right pressure so the car will run properly. Long term you will need an ECU if you go single turbo.

Also, there's a HUGE range when you talk about single turbos. It's more about how much power are you going for - that's how you size a pump. If you're going for 600+ HP or something stupid, you'll need a way different setup than a drop-in single pump. If you're going for 350-400, you should be OK with a Walbro 255.

Dale

 

Yea thats what I'm trying to figure out, I am most likely looking to get around 350whp. Some people swear by Walbro and others swear by the Denso pump and say that Walbros are faulty, so i'm a bit confused. I'm not trying to make a crazy race car, just a simple enjoyable car. But then again I cannot say what I would want further in the future, maybe i'll want an even bigger turbo in the future, but as of now thats not the plan.

So based off what ya said, both of these pumps should be able to support a car with around ~350-400whp. If I were to get any of these pumps, should I also get an aftermarket ECU, or will the stock be fine for now? I would also hopefully like to avoid having to tune my car for now, is that possible? Oh one more thing, So these pumps can support probably around 500hp at the flywheel, so I guess my question is would they both function properly, or will I get any problems if I install one of these pumps to basically a stock car, with no serious modifications. I just wanna get an idea on what I'm going to have to do in the future, while keeping in mind any problems that may arise now.

Thanks for the help guys! Also I don't have the best knowledge around cars, so my bad if some things I said sounds stupid lol

 

Neither the Denso supra pump or Walbro 255 will require you to do anything with the tune if you have the stock regulator. Like Dale said, the issue with Walbro is there are too many fakes. Key is to buy from a reputable supplier. Either of those pumps will let you hit the 350hp mark but you may need more for a single turbo depending on your power goals. Any larger pumps than these should be rewired with a dedicated relay. This may make you run overly rich on a stock tune. I sell a complete kit should you need it for the single turbo setup https://www.irperformance.com/produc...-pump-adapter/

 

Read this thread from Banzai Racing -

https://www.rx7club.com/3rd-generati...added-1104322/

That gives you a great idea of how much each part does and also where you hit the limits of the stock ECU.

If you keep your boost at 10psi, you can run the stock ECU all day. But, that's not easy, you typically have to have some sort of boost control, or at the extreme port the waste gate. There was a thread in the forum recently on the topic, read up.

At the end of the day a fuel pump is a fairly cheap part, I wouldn't sweat it too hard if you eventually have to upgrade it for your goals. You can easily sell it and make a good part of the price back.

Dale

 

Sorry for adding to the thread so late i've been busy with exams. Anyways the issue that some people are saying with the Denso pump seems to be that It draws much more current than the Walbro. I know rx-7s have an issue supplying ample voltage to the fuel pump with the stock wiring. About 4 or so months ago I completed the re-wire mod, and If I remember correctly I am getting around 13V. Is the situation with the Denso pulling in much more current only a problem with the stock wiring? With the re-wire do I have to worry about not supplying enough current to the Denso?

 

Not sure on that. You can always spot check it with a multi meter.

Dale