Fuel upgrading?

[italiabari10]

Well I am new to this forum and damn I am impressed with the numbers coming out of the n54. I've been researching performance upgrades. I don't see much on fuel upgrading though. More so for upgrading turbos. Curious of how good the fuel system is in these cars?
(hoping there isn't a thread that has all this and I over looked it)

[Miko226]

Welcome to the forum! There are a few options to consider with fuel. If you plan to run e85 past a 50% mixture you will need to upgrade your in tank pump or add an inline fuel pump to keep the fuel PSI from dipping to low. As far as turbo upgrade fuel requirements im not experienced in whats needed.

[Stohlen]

Fuel system in the vehicle is good to 500 hp or there abouts. Most available turbo upgrades dont require any fuel system upgrades, but E85 or big time boost will require modification.

[italiabari10]

Thank you. I plan on using e85 but not passed 50%. That's awesome! I'm so used to the basic upgrade fuel with turbo. Also I'm guessing that is 500whp considering FBO cars with meth or e85 are over 400whp. Thanks for the information guys.

[OzJustin]

I know for a lot of cars dedicated E85 compatible fuel lines and pump is required. Is this not the case for the 135i fuel lines, low and high pressure pumps and injectors?

This makes a Vishnu PROcede with flex fuel sensor very attractive then.

What psi do the stock N54 snails run out of puff (move outside their efficiency) - 18 psi max?

[OzJustin]

Please ignore my last question. Found the answer for anyone interested
http://www.n54tech.com/forums/showthread.php?t=16074

[m4xm1l10n]

Originally Posted by OzJustin

Please ignore my last question. Found the answer for anyone interested
http://www.n54tech.com/forums/showthread.php?t=16074

Interesting link.
I run a mix 25-30% E85 and find it to be spot on with my set up, the other day I ran straight MS109 on map 7 and holly hell batman this thing is a beast. Will be adding DP and then hit a local dyno on FBO and MS109 love this stuff btw but expensive

[Dmacc]

Originally Posted by Stohlen

Fuel system in the vehicle is good to 500 hp or there abouts. Most available turbo upgrades dont require any fuel system upgrades, but E85 or big time boost will require modification.

The fuel system isn't suitable for 500whp applications, which is why those guys running that power usually have either an upgraded pump or meth. Someone with RB turbos and e70 with an upgraded inline pump alone made 500whp with no meth. If you plan on upgrading your turbos and are looking for close to 500whp without meth, you'd want to upgrade your lpfp set up.

[italiabari10]

fuel injectors I take it are fine to leave alone? just want to make sure on a few things with this platform. Impressed by it...plus any platform RB is putting time into has to have great numbers come out of it. 19t RB???

[Dmacc]

Originally Posted by italiabari10

fuel injectors I take it are fine to leave alone? just want to make sure on a few things with this platform. Impressed by it...plus any platform RB is putting time into has to have great numbers come out of it. 19t RB???

Injectors are flowing 740whp on this platform so you're okay

[italiabari10]

Wow!! Thanks for the help.

[OzJustin]

I'm slightly sidetracking this topic but what is everybody doing re the stock HPFP? I assume that under higher boost it is placing an increasing load on the pump (more fuel needed) leading to failures. I'm aware of the factory recall but from my searching I have not found any upgrade HPFP's. What should be used and how is the reliability now?

[Nugget]

Vargas modifies them, but I think the jury is still out on it's effectiveness.
There is more info on other forums.

[Dmacc]

I have 35k+ miles on my current hpfp with ~25k tuned on pump gas and about ~10k on straight e85 and it's holding strong so far knock on wood.

[135Pats]

Originally Posted by OzJustin

I'm slightly sidetracking this topic but what is everybody doing re the stock HPFP? I assume that under higher boost it is placing an increasing load on the pump (more fuel needed) leading to failures. I'm aware of the factory recall but from my searching I have not found any upgrade HPFP's. What should be used and how is the reliability now?

There isn't a good solution, you can drill out the rail a bit and remove a filter on the high pressure side...but that's about it. If you keep flow up on the low pressure side you should be OK short of big, big power. WR type runs still need swimming pools of meth.