How much psi is safe on a stock s5 motor with bigger turbo and upgraded to FMIC?

Is it possible to daily run 15psi without upgrading fuel?

Thanks!

 

5 psi


i.e not safe at all

 

Running 15 PSI is pointless on the stock S4 or S5 turbo. After about 12 PSI, they are both just pushing heat.

You can run stock boost on stock fuel. Maybe 8 PSI at the most without having to upgrade the pump. This is with the stock turbo.

With an upgraded turbo, it totally depends on the turbo itself. But the easy answer is no.

 

the answer is hidden behind your vague mention of "Bigger Turbo"

A t04B and T04R are "bigger turbo's" but there is a HUGE difference in fuel requirements.

so the simple answer to your question is NO because you don't know what your doing.

 

let me clear a few things up. I am talking about s5 turbo2 motor, not turboing n/a motor...... and I am talking about this turbo http://cgi.ebay.com/ebaymotors/GT45-...ayphotohosting - this is what I have.

What I am trying to do is run 15psi. I know i need to upgrade my fuel, but its not an option at the moment, so that is why i am asking, is it possible? is it safe on stock ports?

 

why is it that people are so obsessed with how much "boost" they can run. Power should be your goal, not how much mad boost you can run yo. If it is not an option to upgrade fuel then how is it an option to upgrade to a shitty ebay Turbo? I would set my priorities straight before wasting money to blow a motor (you can do that for free)! You cant just throw a bigger turbo at your car and crank up the boost to make power. there are supporting mods, no way around it unless you really enjoy rebuilding.

 

Now for a real answer. Youd be better off buying bigger injectors, a rtek or safc, exhaust and fmic and see what you can do with the stock turbo. That ebay turbo isnt going to last very long at all and its like throwing your money away. You will blow your motor with stock fuel injectors if that turbo actually boosts. If you want to build something nice thats going to make power, you cant start with that turbo.

 

The auction title says that is a GT45. It's not a GT45.

Since they give no specs or measurements other then saying it's a "TO4B", I'll assume it's some kind of TO4B.

It may be made in China and of poor quality, it might not be. This looks very similar to a turbo a friend of mine just bought and I was impressed at the quality of his unit. Even if it is a China turbo, it seemed fairly tight, had a good weight to it, no play and spun nicely. This looks like the same unit. The 1.15 hotside is a bit big but nothing out of the ordinary for a 13B. On a low compression stock ported engine I would expect a bit of lag.

Why do you want to run 15 PSI specifically? What is so special about that number?

At 15 PSI this turbo will make about 350-370 HP. The stock fuel system will never support this.

Porting is not an issue.

And I'll be cleaning this thread momentarily...

 

Thanks for the clean up Aaron.

Nothing special about 15psi. Just a close number to my desired power I want to make at the end of my project.

My goal is to run 350hp to the wheels, like you projected. I understand that its not possible with stock fuel setup, and I am not going to try it. I am working on getting that upgraded within the next few months. But what i already have is this:
1. huge FMIC with 3" piping
2. 40mm wastegate
3. 3" downpipe going into Racing Beat 2.5" catback
4. t04b turbo with 1.15 hot side
5. I have an old school HKS PFC F-con which i already know I need to throw away because its just old school.

And this is pretty much it. I have 8psi spring in my wastegate and 10psi (i think) spring in my blow off valve.

What i would like to settle at before doing fuel upgrades, is 220rwhp to 250rwhp without putting to much stress on the engine. I dont want to risk it before I have everything right, but at the same time, i want to be a tiny bit faster than stock s5 turbo2.

Another drawback is my HKS PFC F-con... it is programmed for stock injectors and stock fuel pump.

What would you guys recommend?

 

Don't buy that ebay turbo, you will regret it in the end.

Speaking of Chinese knock offs, I hope you didn't buy an "ebay" waste gate. You will really regret that, more so than the turbo. They are not of the same quality and you'll be kicking yourself when it boost spikes (which can kill a motor).


Good luck.

 

CHeap will bite you in the ***.

Spec.

 

You are forgetting one thing... a turbo manifold! If you get one made for the FC, it's going to cost you, because there are very few options these days. You will have to get a manifold from A-Spec or something like that to run a divided turbine housing properly. Or you can buy a turbo manifold made for an FD, and then use a header flange as a spacer.

You will need at the very least and Rtek 2.1 for fuel management, or a full standalone like Haltech, Power FC, Microtech, or Megasquirt.

 

I was looking into Rtek2.1 but could not find one for my s5.

By the way, i already have a turbo manifold and everything is bolted on to it too.

 

Get a real standalone, not a piggyback or a pseudo-standalone like the RTek that still relies on the stock wiring.