Engine/Transmission (1998.5 - 2002) Stocker hitting 25 # of boost

[BroncoMarc]

I've always read that a stock engine won't hit over 20 pounds of boost. I put on gauges last week and I can easily hit over 20. I typically hit and hold 24 pounds going up an onramp. I've seen it hit 25 going up a steep hill.



Is this possible, or did a previous owner make a mod that I don't know about? The only engine related bomb I've done is a BHAF.



Where should I look to see if a mod has been made? It would have to be an electronic mod, wouldn't it?

 

[JBlock]

Two questions

It act like you got RV injectors, and the waste gate tie down or been recalabrated. No codes being set and no defuelling without a booster fooler, perhaps he installed a boost fooler too.

 

[Dreher]

For two years I drove my 96 12V and never saw over 18 psi. Then one day I'm going up a hill on the freeway at heavy throttle and I see I'm at about 26. This is with completly stock setup. I think the wastegate stuck closed. That was two years ago and I still haven't fixed it.



bob

 

[BroncoMarc]

Where would I look for a boost fooler. . I thought you would need an EZ or something similar for a boost fooler. . Are there dedicated boxes?



I hope it doesn't have RV injectors. . I just ordered some 275s.

 

[JBlock]

Booster fuller

Look in the map sensor plg it on driver side of the engine just in front of the fuel filer as I recall. Yes I understand that stock engine defuel above 20 psi range.



Joe

 

[TowPro]

On the DS of the motor, under the intake manifold, kind of up and behind the fuel filter is a sending unit screwed into the side of the engine. This sending unit has a wire harness with 3 wires going to it. If there is a boost module, it will probably be in line between the factory wire harness and the sending unit.



Now If you look at the rubber line that goes from your turbo charger to your waist gate, you will see a brass elbow screwed into the turbo. Does this rubber line have a permanent clamp on it or a screw type? If its the screw type somebody has pulled this off at one time or another (you could probably force the hose back on with the permanent clamp as well if you tried hard enough). Look at the brass elbow. The modified one will have a small hole drilled into the side, with a setscrew taped into the inside of the hole. (this set screw can be turned to change your max boost level) The factory one is just a plain straight threw elbow with no bleed holes or setscrew. Another trick to to raise the boost it to put a . 22 shell into this hose, blocking the pressure to the waist gate altogether.



If you modify your waist gate for more boost, you will also need the boost fooler others have talked about. Your ECM monitors your boost level, when it sees around 20psi it will turn down the fuel to limit the boost level. But with stock fueling, raising the boost level is not worth anything. It takes more fuel to create more boost.

 

[pwr2tow]

On a stock engine and your getting 25 PSI of boost, your gauge is either messed up or someone has modified your truck prior to you buying it.



Ron

 

[BroncoMarc]

My boost sensor wires go strainght into a main harness and the elbow on my turbo has a permenant clamp on it



Does that just leave a bad gauge? I'll try to find a pressure gauge to confirm what my boost gauge is saying.



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