My question simply is how many pounds can I boost with my stock turbo until it is pushing its limits? The highest I've seen is 25 pounds but I don't want to go higher than that because I'm not sure. My trucks an 02 f250. 6 speed manual.

I was told with my OBS 7.3 that about 28 psi was as high as you would want to go with the stock turbo. I do occasional scrap metal hauling trailer hauling so this information would be pretty good to know

 

Yep, you don't want to push is past 27 psi too often - the load on the thrust bearing can lead to an early turbo death. Not to say that going to 28-30psi (if you can) will cause it to destruct right away - but over time it will reduce it's life span. In addition, anything higher sends efficiency out the window, increases heat and sends the shaft speed past it's operating range.

edit: But, those that want a new turbo will give her hell

 

a turbo will only make as much boost as it wants to.
if it only need 5 lbs, that is all it will make. or if you really load it down, it could make 30 lbs.
the limiting factor of a turbo is the engine, not the turbo itself.

 

Also don't you run the risk of breaking rods going to much past that?

 

I have read that on here as well. It depends upon the rod and how it was manufactured if stock.

Also, some on here say that valves can start to float at higher boost.

 

Just as potential caveat on this thread, without a boost fooler or tuning, the stock tune will defuel at 22psi I believe so you won't really see anything above that without something bypassing the defueling.

I have the OCR on my truck with stock turbo and can hold 27psi under load if I wanted to.......also this assumes everything else is working fine and not leaking.

 

All I have is a straight pipe and DP tuner. I'm not sure that it has a boost fooled or not I bought it used from a dealer

 

I believe Jody's tunes from DP have the defueling covered so that shouldn't come into play......

 

Please pardon the interruption...

Different question, but related.

Stock turbo with approx. 280K miles.

I just replaced my stock uppipes with bellowed uppipes, and at the same time did the EBPV delete with a new pedestal and outlet. I've had the boost fooler tube in the red line ever since I got the truck at 114K miles 8 years ago. I also have Clay's OCR installed.

Question... as I finish putting everything back together this weekend, is there any benefit or value in keeping the boost fooler tube in the red line, or should I simply allow the OCR to handle the same thing?

 

Hi Pete!

Here are some pics Robin had posted in the past. The red line is part of the wastegate controller. So whatever you do to it or with it will affect when the wastegate opens. Most people want the wastegate to open later so they get more boost. What do you have hooked up to the red line or did you plug it into one of the boot clamp bolts?

The OCR or boost fooler is connected to the MAP sensor to keep the Check engine light from coming on when the boost goes over 22 psi. It also is to prevent defueling by the PCM unless the program/tune adjusts for that.

 

It all depends on what turbo characteristics you are after. Do you like the way it performed before? I don't imagine you hang out much over 20 psi, but if you would like the wastegate to open later and build more boost earlier then you can tighten the actuator rod. But if you're happy with the way she runs then let her be for another 280,000 miles.

Roland's explanation:

"Plugging the red line from the WG solenoid to the WG actuator will net higher boost. The WG actuator starts bleeding off boost at ~ 5psi. On a stock turbo, benefits can be had by tightening (shortening) the WG rod. This allows more boost to build before opening the wastegate and still allows computer control with the red line connected."

 

What I've always had in the red line (installed by PO), is a boost fooler tube which is a hard brass tube with a hole in it. Sounds like I'll just keep it in place.

 

Sounds like a pressure relief that delays the wastegate.

 

Yep that's pretty much the deal. Here's the pic from Dfuser. It's a brass connector and rubber hose with a small hole drilled in it. I had one but boost kept hitting 30 and I was not comfortable with that. I think it could be useful as a band aid to punch up the boost a bit if it's low for some reason. Or on the stock tune.

 

I discovered one of these on the red line when I first bought Stinky:




This is the modification I did to the modification on the otherwise stock Stinky:




This is how far the boost will go with a hot tune on a stock truck, - but I don't recommend it: