boost falls wot when shifting

[JPilkinton]

Ok boys finally got me some gauges.. yes they are glowshift and i know they arn't the best but i just cant foot $15o plus for a single gauge from isspro at the moment...

but real question is when i am at WOT i hit about 18psi and drops below 15psi to about 10-11psi as it shifts and has to climb back up to 15psi while at WOT is this normal or what? doesn't seem right to me at all shouldnt it stay at a consistant boost the whole time at WOT, and during WOT it was about 850-950* egt seems really high for stock

and the truck has DIY-6637,3.5" exhaust banks, ccv mod

any input greatly appreciated!

[Joeshu1000]

Sounds like your turbo needs to be taken out and cleaned or you might have a boost leak some where. Stock tune I have hit 1000 degrees before. I also have Glowshift gauges and have good luck with them.

[JPilkinton]

so pretty much turbo rebuild? and a 1000* thats alot thought our trucks were not suppose to reach anything over 1250*!? thats not far from 1000*

[Joeshu1000]

I've seen upwards of 1500 degrees with the looney tune. Of course, I don't let it sit there for too long. It does sound like a turbo issue. I cleaned my turbo when I put in my EGR delete in. My turbo was working fine, but it needed some cleaning. Hopefully someone else will chime in who is smarter than me.

[JPilkinton]

yeah it probably is turbo i do have 194K miles on the o'l ford lol

[jesilvas]

You do no clean a 7.3 stock turbo. Or any non VGT turbo for that matter.
Are those boost readings under a locked TC or not?
Also, where is the probe for the EGT and what was the ambient temp?

[JPilkinton]

egt prob is on the left side mani at the rear of the mani. and normal driving temps was like 400-600*nothing high at all. and TC locked idk??? tow haul was off lol?

[blue99stroker]

your boost numbers dont sound to off mark. especially since you are at stock programming.
your egts do seem a tad bit high although you could have a slight boost leak. i think 900 degrees is abut the highest temp you should get stock.

[JPilkinton]

yeah i was just concerned when it was shifting it dropped so low like 10psi and had to climb back up to 15-16psi that seemed little weird

[blue99stroker]

your driving temps are were they should be. ive never floored it and looked at boost on stock programming so im not sure if yours is normal. but 15 psi is pretty good for stock programming. 17 psi is about as high as you will get stock