does this sound right for a "stock" truck

[binder man]

The other night on the way home I was passing a semi and hit 95 and my truck just quit accelerating...so I figured there was a speed limiter set there...well on the way to the machinery show I told a buddy that and he said lets see it, so I started accelerating then floored it I hit 90 and he says HOLY S*** your running 30 lbs. of boost! So I look and she was sitting on 30 then when I hit 30 it quit accelerating....why would my truck make that much boost? I don't have any chip or anything in there just the red wastegate line MIA and as far as I know its a stock turbo? any ideas?

Luke

[Dirk]

Unplugging the red line only adds 4-6psi. At 30psi, your truck will be defueling like crazy and the SES light will come on. If it isn't coming on, you have a map fooler of some sort, or you aren't making that much boost. Also, you'd need a chip to push the AB injectors that hard to drive the turbo that high. Even when I was experimenting with programmers a few months back before I decided on a DP chip, MAX boost was 20-22psi. unplugged was around 25-26psi.

This was before AND after moving to the 6.0 IC. I lost about 2psi moving to the large IC.

[Dirk]

Also, before I bought a ITP boost fooler, my SES light would not come on till about 70mph from a dead stop run and would stay on for about 20 seconds or so.

BUT, I could tell that the engine was defueling above 20-23psi due to the truck falling on it's face through the gears. Now it pulls VERY hard (23-26psi to 97 MPH) then falls on it's face on the "stock" setting.

Now that I have the PMT2 (2001) pcm and not the XLE4 (early 99) pcm, I haven't had time to play tuning. I really need to call Jody and fix that.

[binder man]

I have no SES and from what I've been around my gauge seems very accurate...about 5 lbs. of boost on highway...I HAD a map fooler, somebody grounded out a wire but when I got it I hooked it up the way it was suppose to be because I wasn't a big fan of the way it was done...and absolutely NO chip I've ran an evo on it and it accepted it. Its got to be defueling though unless there really is a speed limiter at 95...plus I was still pulling hard all the way to 95 and as soon as it hit that much boost it just fell on its face and its always right around 95

Luke

[Dirk]

It is probably OBD II programmed. 5lbs at what speed? At 65-70mph, I MIGHT have 3psi if that. Going up a hill or HEAVY headwind, I may hit 5psi.

EDIT: Also, just for COMPLETE giggles, I returned my truck to stock and saw 16psi MAX.

[binder man]

I guess it could be that...about 60-65 its 4-5 pounds then I step on it and it goes to 20....if it is tuned it isn't much because the highest egt I've hit was 1000 and that was after the 10K before that it was only like 800 MAX

[Dirk]

If the truck was "tuned" and you put a pcm unlocked tuner on it, the evo would accept the trucks program as "stock".

[Dirk]

Originally Posted by binder man

I guess it could be that...about 60-65 its 4-5 pounds then I step on it and it goes to 20....if it is tuned it isn't much because the highest egt I've hit was 1000 and that was after the 10K before that it was only like 800 MAX

ODB II tuned, I hit 1000-1100 with the stock IC. With the 6.0IC, I can hit 900-1000. 1300 is easy with a chip.

[binder man]

right thats why I'm wondering why there so low...i can keep up with a 2002 auto reg. cab. with a ts on 140, and another late 99 six spd. with a DI....something isn't adding up...anyway to tell if its obd II programmed?

Luke

[Dirk]

Not without a scanner like a MT2500 or AE software. Your EGT's are inline with old obd II tuner. The boost is inline with a tuner if you consider you've removed the red line. I still think your gauge may be a bit off, but that's an opinion only.

Considering the age of your truck, I'd be surprised, VERY surprised if it wasn't tuned in SOME way.