7.3 Hyperpac and turbo problems
Thread Starter
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Fleet Mechanic
Joined: Jun 2009
Posts: 1,866
Likes: 8
From: Fleetwood, PA
7.3 Hyperpac and turbo problems
Hey guys -
i have a f250 7.3 and it has inline twin turbo on it.
i bought the hyperpac touchscreen and stuff its pretty cool, but i pluged it in and drove for a little. i was watching the gauges, i got onto the highway and gave it full throttle. it was only reading about 20psi when it shifted. is this right with a twin turbo setup on it? i was thinking that shoudl be a lot higher
i have a f250 7.3 and it has inline twin turbo on it.
i bought the hyperpac touchscreen and stuff its pretty cool, but i pluged it in and drove for a little. i was watching the gauges, i got onto the highway and gave it full throttle. it was only reading about 20psi when it shifted. is this right with a twin turbo setup on it? i was thinking that shoudl be a lot higher
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Got any pictures? I'd like to see them.
To answer your question, we'll need more info. We should probably also move this down to the 7.3 diesel section, but you'll need to tell us what year model you have so we get it in the right section.
Remember boost is a nice reading to go by, but the really important thing is the volume of air. A larger turbo can push more CFM at a lower pressure (boost) than a small turbo. We'll need to know more about your turbos, and where you have the boost gauge plumbed in to before we can comment on the pressure reading.
20 psi sounds low for a modded 7.3, but if the air volume is there, then it could be right.
To answer your question, we'll need more info. We should probably also move this down to the 7.3 diesel section, but you'll need to tell us what year model you have so we get it in the right section.
Remember boost is a nice reading to go by, but the really important thing is the volume of air. A larger turbo can push more CFM at a lower pressure (boost) than a small turbo. We'll need to know more about your turbos, and where you have the boost gauge plumbed in to before we can comment on the pressure reading.
20 psi sounds low for a modded 7.3, but if the air volume is there, then it could be right.
Thread Starter
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Fleet Mechanic
Joined: Jun 2009
Posts: 1,866
Likes: 8
From: Fleetwood, PA
i will go out and take pictures tomorrow its dark out. if it help at all...
the turbos are stacked on top of eachother, i guess (inline)
and i am getting the reading from the Hyperpac itself. i guess it reads it from the ecu. I have no idea why it would be that low. especially with twins on there
it is a 2000 F250 Powerstroke with 7.3L XLT Also has a A&M Cold air intake and 4" mainifold with straight pipe.
the turbos are stacked on top of eachother, i guess (inline)
and i am getting the reading from the Hyperpac itself. i guess it reads it from the ecu. I have no idea why it would be that low. especially with twins on there
it is a 2000 F250 Powerstroke with 7.3L XLT Also has a A&M Cold air intake and 4" mainifold with straight pipe.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
We'll see if we can't get this thread moved down into the 99 - 03 7.3 diesel section. If you look for the thread later, be sure to scroll down further in the main forum listing or just follow the email link.
I'm guessing you just got this truck since you do not seem to have much info on the twin turbo set up. I'm a little concerned that a truck with 2 turbos did not have gauges installed before the 2 turbos were put in.
The truck computer will defuel the truck at a certain boost reading, so most folks install a "boost fooler" so the computer does not see the elevated boost pressure. Accurate boost readings are usually read by an independent gauge ported into the intake side (often the AIH fitting). If a boost fooler has been installed in the truck, the pressures seen by your electronic gauge (coming from the MAP sensor) will be incorrect.
I'm guessing you just got this truck since you do not seem to have much info on the twin turbo set up. I'm a little concerned that a truck with 2 turbos did not have gauges installed before the 2 turbos were put in.
The truck computer will defuel the truck at a certain boost reading, so most folks install a "boost fooler" so the computer does not see the elevated boost pressure. Accurate boost readings are usually read by an independent gauge ported into the intake side (often the AIH fitting). If a boost fooler has been installed in the truck, the pressures seen by your electronic gauge (coming from the MAP sensor) will be incorrect.
Thread Starter
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Fleet Mechanic
Joined: Jun 2009
Posts: 1,866
Likes: 8
From: Fleetwood, PA
hm, so i guess if i had one of those installed where would i find this "boost fooler" i just got the truck and some yip yap installed everything himself. i do drivetrain, engine work is left to someone else.
i guess my best bet is to get a mechanical gauge and hook that up to read by turbo. heres the question -
should i get a gage per turbo, or just one gauge.
where is the "boost fooler" installed.
do i need to do anything to do ECU when i install the boost fooler
if im right shouldnt i be pushing more like 40 or 50 pounds of pressure if i have a twin setup and a programer?
i guess my best bet is to get a mechanical gauge and hook that up to read by turbo. heres the question -
should i get a gage per turbo, or just one gauge.
where is the "boost fooler" installed.
do i need to do anything to do ECU when i install the boost fooler
if im right shouldnt i be pushing more like 40 or 50 pounds of pressure if i have a twin setup and a programer?
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Depends on the programmer and turbos for the boost pressure. The fooler would be installed at your MAP sensor so the computer does not defuel the truck when you get on it.
One gauge will be fine. If you install it where the AIH goes, you'll get an accurate reading of what's going into the intake manifolds. Something like this Riffraff Diesel: RDP AIH Tapped Fitting will allow you to remove the AIH and install a boost sensor.
One gauge will be fine. If you install it where the AIH goes, you'll get an accurate reading of what's going into the intake manifolds. Something like this Riffraff Diesel: RDP AIH Tapped Fitting will allow you to remove the AIH and install a boost sensor.
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Fleet Mechanic
Joined: Jun 2009
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From: Fleetwood, PA
did some research, though the boost fooler is a good thought, the fact that my light dosent even come on when i hammer it means that it isnt getting to the fact where there is too much pressure.
also i have 0 black smoke with the hyperpac on stage 3.
also i have 0 black smoke with the hyperpac on stage 3.
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Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Man, this is something else. With two turbos, you would think the injectors were changed out also, and I would think they would be Single Shots at the least. If you have A/M injectors, you will need custom tuning. Tell us what all mods you have on the truck, and take pics so we can see what is on the engine. How can two turbos be stacked on top of each other and still close the hood? 
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
That is only one turbo. You are pointing at the exhaust and compressor housing. That is a normal setup.
If that is a K&N intake setup, we are not liking them to much around here. Start asking question on here before you do anything to your truck. We can point you in the right direction, and you will not be doing things twice.
If that is a K&N intake setup, we are not liking them to much around here. Start asking question on here before you do anything to your truck. We can point you in the right direction, and you will not be doing things twice.
Thread Starter
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Fleet Mechanic
Joined: Jun 2009
Posts: 1,866
Likes: 8
From: Fleetwood, PA
That is only one turbo. You are pointing at the exhaust and compressor housing. That is a normal setup.
If that is a K&N intake setup, we are not liking them to much around here. Start asking question on here before you do anything to your truck. We can point you in the right direction, and you will not be doing things twice.
If that is a K&N intake setup, we are not liking them to much around here. Start asking question on here before you do anything to your truck. We can point you in the right direction, and you will not be doing things twice.
its an a&m but i guess teh biggest questiong is why no black smoke with the tuner at stage 3
Thread Starter
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Fleet Mechanic
Joined: Jun 2009
Posts: 1,866
Likes: 8
From: Fleetwood, PA
lol nice beer ide go with a darker ale tho.
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Because that tuner is an off the shelf tuner and it don't have enough power to make smoke. If you would have asked about tuners/chips before you bought that one, we would have told you what is best for the 7.3