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Old 08-24-2012, 10:33 PM   #1
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08 roush no boost

So I just bought my 08 stage 3 and that night while taking my 16 year old son for the ride of his life I notice the boost gauge will not show any boost. This is my first s/c car however I do know a little and I know it only provides boost under heavy acceleration. ( did I mention the ride of his life?) The boost gauge shows vacuum however when you stand on it the needle simply snaps to zero and no boost. The s/c whines like it's kickin arse and taking names however the car feels like it should have a whole lot more. Of course I am taking it back to the dealer on Monday but you guys all seem very knowledgeable about these cars and I am hoping someone can give me some things to look for. I can't say as I really trust this dealership as this is the first time I have dealt with them. Any ideas? By the way did I mention I love this car (wife may even be getting a little jealous). Ha
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Old 08-25-2012, 06:24 AM   #2
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Nobody?
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Old 08-25-2012, 07:21 AM   #3
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it could be that the gauge is hooked up to rong vacuum line. take a picture under the hood so we can see where its hooked up at.
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Old 08-25-2012, 10:32 AM   #4
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Do these help at all?
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Old 08-25-2012, 11:01 AM   #5
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Is it an aftermarket gauge you had installed or was the gauge there from ford?
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Old 08-25-2012, 12:08 PM   #6
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It's a roush gauge. I assume came with the car.
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Old 08-25-2012, 12:51 PM   #7
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Quote:
Originally Posted by Mattz400
Do these help at all?
take a picture up close on the driver side of the blower. i want to see where the tube is hooked up at
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Old 08-25-2012, 02:50 PM   #8
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Quote:
Originally Posted by Rapinator126

take a picture up close on the driver side of the blower. i want to see where the tube is hooked up at
Ok I will tonight.
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Old 08-25-2012, 03:07 PM   #9
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Off topic but nice car!!
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Old 08-25-2012, 03:16 PM   #10
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Off topic but nice car!!
Thank you.
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Old 08-25-2012, 06:30 PM   #11
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Quote:
Originally Posted by Rapinator126

take a picture up close on the driver side of the blower. i want to see where the tube is hooked up at
This better?
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Old 08-25-2012, 08:33 PM   #12
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I gotta get this figured out quick. I gotta 2012 camaro ss wants to run em. Not sure I'll get it done with no boost Out of the s/c
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Old 08-25-2012, 08:44 PM   #13
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Quote:
Originally Posted by Mattz400
I gotta get this figured out quick. I gotta 2012 camaro ss wants to run em. Not sure I'll get it done with no boost Out of the s/c
yup its hooked up wrong. thats why you only getting vacuum. It does not hook up to the backside of the supercharger. i going to make a little diagram and show you where it goea

---------- Post added at 08:44 PM ---------- Previous post was at 08:38 PM ----------

see that hose coming out of the intake base of the supercharger with the little 90 degree brass fitting? that is where it needs to be hooked up at. you will need a plastic "T" fitting. you cut that hose in half and put the t fitting in between it and the clear tube from gauge hooks to that
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Old 08-25-2012, 08:50 PM   #14
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look at where blue arrow is. this is the correct hose it needs to be hooked up at. the second picture i made the actual hose blue. you will need to cut this hose and use the plastic "T" fitting.
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Old 08-25-2012, 09:03 PM   #15
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Quote:
Originally Posted by Rapinator126

look at where blue arrow is. this is the correct hose it needs to be hooked up at. the second picture i made the actual hose blue. you will need to cut this hose and use the plastic "T" fitting.
Do you have a pic of one hooked up right?
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Old 08-25-2012, 09:04 PM   #16
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Quote:
Originally Posted by Mattz400

Do you have a pic of one hooked up right?
let me see if i have one still of my old roush
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Old 08-25-2012, 09:05 PM   #17
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Quote:
Originally Posted by Rapinator126

let me see if i have one still of my old roush
Which hose is wrong. I understand where you say it needs to go but which hose needs to go into the new t?
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Old 08-25-2012, 09:10 PM   #18
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Quote:
Originally Posted by Mattz400

Which hose is wrong. I understand where you say it needs to go but which hose needs to go into the new t?
here where it should be

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Old 08-25-2012, 09:13 PM   #19
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where black arrow is. That is the clear hose thats hooked up wrong.
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Old 08-25-2012, 09:31 PM   #20
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Quote:
Originally Posted by Rapinator126

where black arrow is. That is the clear hose thats hooked up wrong.
Thanks for all your help rapinator126. I will try it tomorrow. The clear hose is just the boost gauge right? The bypass valve appears to close when you rev up the engine. Are you thinking that I am getting boost but the gauge just doesnt show it?
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Old 08-25-2012, 09:35 PM   #21
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Quote:
Originally Posted by Mattz400

Thanks for all your help rapinator126. I will try it tomorrow. The clear hose is just the boost gauge right? The bypass valve appears to close when you rev up the engine. Are you thinking that I am getting boost but the gauge just doesnt show it?
well where it was hooked up at it wont show boost at all anyways. And you have to be getting boost. is the blower winning at full throttle? with the stock pulley you will only see about 4-5lbs anyways. it doesn't make alot of boost through the m90
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Old 08-25-2012, 09:39 PM   #22
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Quote:
Originally Posted by Rapinator126

well where it was hooked up at it wont show boost at all anyways. And you have to be getting boost. is the blower winning at full throttle? with the stock pulley you will only see about 4-5lbs anyways. it doesn't make alot of boost through the m90
Ok. Thank you again...I will keep you posted.

---------- Post added at 09:39 PM ---------- Previous post was at 09:38 PM ----------

Quote:
Originally Posted by Rapinator126

well where it was hooked up at it wont show boost at all anyways. And you have to be getting boost. is the blower winning at full throttle? with the stock pulley you will only see about 4-5lbs anyways. it doesn't make alot of boost through the m90
By the way. Yes the blower sounds great at full throttle
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Old 08-25-2012, 09:40 PM   #23
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you need to buy the vmp500 kit man. makes a good difference. around 7-8 psi is what you will get. it will get you to 500 at the crank. around 420 at tires then

---------- Post added at 09:40 PM ---------- Previous post was at 09:39 PM ----------

And you are welcome.
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Old 08-25-2012, 09:49 PM   #24
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Quote:
Originally Posted by Rapinator126
you need to buy the vmp500 kit man. makes a good difference. around 7-8 psi is what you will get. it will get you to 500 at the crank. around 420 at tires then

---------- Post added at 09:40 PM ---------- Previous post was at 09:39 PM ----------

And you are welcome.
I like the sounds of that.
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Old 08-25-2012, 09:53 PM   #25
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Quote:
Originally Posted by Rapinator126
you need to buy the vmp500 kit man. makes a good difference. around 7-8 psi is what you will get. it will get you to 500 at the crank. around 420 at tires then

---------- Post added at 09:40 PM ---------- Previous post was at 09:39 PM ----------

And you are welcome.
I did a temp fix just to try it out. As you see from the pic. About four pounds of boost. Ha. You are the man. Thanks for the help
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Old 08-25-2012, 09:59 PM   #26
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Quote:
Originally Posted by Mattz400

I did a temp fix just to try it out. As you see from the pic. About four pounds of boost. Ha. You are the man. Thanks for the help
You are welcome. Glad you got it done
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Old 08-25-2012, 10:01 PM   #27
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Quote:
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I did a temp fix just to try it out. As you see from the pic. About four pounds of boost. Ha. You are the man. Thanks for the help
So what's it take to get the vmp 500 kit? I assume a shop will need to install and new tune?
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Old 08-25-2012, 10:04 PM   #28
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Originally Posted by Mattz400

So what's it take to get the vmp 500 kit? I assume a shop will need to install and new tune?
no you can install yourself. go to vmptuning.com to get the kit. it will come with smaller supercharger pulley a 90mm idler pulley, cold air kit and a programmer with a pre loaded tune. i will attach a picture of my old one with the kit on it

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Old 08-25-2012, 10:25 PM   #29
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no you can install yourself. go to vmptuning.com to get the kit. it will come with smaller supercharger pulley a 90mm idler pulley, cold air kit and a programmer with a pre loaded tune. i will attach a picture of my old one with the kit on it
I thought I read someplace there was no way to use a Roush charger with any other tuner?
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Old 08-25-2012, 10:27 PM   #30
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Originally Posted by Mattz400

I thought I read someplace there was no way to use a Roush charger with any other tuner?
No thats not true. justin over at vmp is the master when it comes to roush.
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Old 08-25-2012, 10:29 PM   #31
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No thats not true. justin over at vmp is the master when it comes to roush.
I will check them out. Again you can't imagine how much of a help you have been.
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Old 08-25-2012, 10:46 PM   #32
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Originally Posted by Mattz400

I will check them out. Again you can't imagine how much of a help you have been.
Anytime man.
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Old 07-21-2013, 02:40 AM   #33
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Anytime man.
i like to browse threads of mustangs i cannot afford yet when I can't sleep.

Also cause I'm an information sponge but anyway

Kudos for pin pointing the problem on this dudes roush!
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