Your right not saying the walbro 255 is bad or anything but going with bigger turbo output flowing more air an upgrade is well needed. I think the cost between the two is only like $20...

****, I'll bet the difference is even less at their cost. :rofl2:

That falls under the category of "**** I know now". If I had gone bigger on pump and injector the first time, it would have saved me some labor cost when I decide it's time to go for more power.

You mean the labor costs of making sure I've got enough bourbon to get me through the weekend project?

Yeah, some of us didn't have access to a garage with a lift when we ordered our turbo kits. :rofl2:

Some of us didn't throw the powertrain warranty in the trash can either. If I was offered that deal I would probably have happily handed the dealer a couple thousand to install

Let's hope I never have to find out if they really will warranty a motor. (knocks on wood).

Did you check to see if they would warranty the radiator labor considering they recommended and insatlled it?

Nah. They made it clear a failure of an aftermarket part not due to thair install wasn't their issue. I don't have a problem with that.

Sorry Cosmo, minor threadjack. ;)

:iagree:

It's all good...:tiphat:

Walbro 255 is no way near enough to support 600 WHP on pump gas..
The more boost the less LPH. Ive learned this the hard way.. The only way to get 600 WHP with single pump is E85, E85 will make a lot of HP without going that high of boost so that will the single enough for 600 etc

I think there are a few here that have made over 600whp on a single and stock fuel rails without e85...

Well it depends on the size of that single. You need 30% more fuel when running e85 to make the same amount of power than on 93. It would have to be a 340lph pump with 1000cc injectors to hit 600, this on stock rails and no fuel return system.

With 650cc injectors or higher and a fuel return system, 600rwhp on 93 is possible as well.

I have had a customer hit 670rwhp maxed out on a single walbro 255 with gasoline. Pressure was falling hard, but it made the dyno pull. This was on a low compression VQ35DE. A stock compression VHR should in theory be able to go a little further. A pump alone does not determine your fuel quantity at the rail. Remove all sources of pressure drop and you will lower operating pressure at the pump, increasing the pumps output. That said, I do not recommend attempting that power out of a 255.

The restrictive sources of pressure drop along the system will increase pressure at the pump to maintain the same rail pressure. The higher the volume, the more drop the restrictions will generate, and the more pump pressure is required to maintain rail pressure. If you can get your fuel pressure at the pump to be the same as pressure in the rails at the volume of fuel you need, you will see maximum results from the pump.

There is no benefit to overpumping a car... it makes sense to use a pump that is just over your needs. Remember that a fuel pump is not like injectors in the sense that injectors are working harder the harder you work them... a fuel pump is working its hardest all the time, from engine idle to full power. So there is no harm in running the pump for all its worth, because the pump doesnt know any better. You only need a little extra pump for occasions where you might overboost or its nice and cold out and you make an extra 30-40hp. Generally I think that people over-pump a car simply because they dont know precisely how efficiently their build is going to use the fuel its given, so they go big to prevent having to go back in.

:iagree:

pretty basic engineering there