my s4 is lacking power
05-07-14, 04:21 AM
#1
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my s4 is lacking power
Its laging real bad motor is sweet runz mint. Turbo spools realy loud and all you kan here is really loud air suction. It seemz to me like a boost leak and getting unmetred air but i kant find issiu any ideas?
05-07-14, 06:02 AM
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Na just bp gauge it reads a bit over half a bar so ruffly 7psi i guess cant remember vacume i havent driven it for a week last time it was dark and i was doing skids and noticed it on way home
05-07-14, 11:58 AM
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I'll actually be helpful here.
1) It seems you are saying you do have boost gauge. Does it read vacuum?
2) Report back your vacuum reading at idle. 16 in Hg is about right for a healthy engine. Less than this you may have a weak engine or a leak. You may need to convert units.
3) MOST IMPORTANTLY: Check for boost leaks. You'll need to put together a boost leak checker. Google it.
A quick example I found:
How To: Boost leak tester for $5.02 - evolutionm.net
Basically you just need to put pressure into the system (bike pump works) and listen for hisses. Any noise and you have a leak. Try to pump it up to 1 bar to simulate the system under pressure.
When I do this I typically pull off the intake to the turbo INLET and the other end is blocked by the throttle body. This will leak down a little bit, but again you are listening for external leaks.
Most likely you have a broken seam at the intercooler or a split hose that does not make itself known until under pressure.
Happy hunting
1) It seems you are saying you do have boost gauge. Does it read vacuum?
2) Report back your vacuum reading at idle. 16 in Hg is about right for a healthy engine. Less than this you may have a weak engine or a leak. You may need to convert units.
3) MOST IMPORTANTLY: Check for boost leaks. You'll need to put together a boost leak checker. Google it.
A quick example I found:
How To: Boost leak tester for $5.02 - evolutionm.net
Basically you just need to put pressure into the system (bike pump works) and listen for hisses. Any noise and you have a leak. Try to pump it up to 1 bar to simulate the system under pressure.
When I do this I typically pull off the intake to the turbo INLET and the other end is blocked by the throttle body. This will leak down a little bit, but again you are listening for external leaks.
Most likely you have a broken seam at the intercooler or a split hose that does not make itself known until under pressure.
Happy hunting
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05-07-14, 12:33 PM
#8
I'll actually be helpful here.
1) It seems you are saying you do have boost gauge. Does it read vacuum?
2) Report back your vacuum reading at idle. 16 in Hg is about right for a healthy engine. Less than this you may have a weak engine or a leak. You may need to convert units.
3) MOST IMPORTANTLY: Check for boost leaks. You'll need to put together a boost leak checker. Google it.
A quick example I found:
How To: Boost leak tester for $5.02 - evolutionm.net
Basically you just need to put pressure into the system (bike pump works) and listen for hisses. Any noise and you have a leak. Try to pump it up to 1 bar to simulate the system under pressure.
When I do this I typically pull off the intake to the turbo INLET and the other end is blocked by the throttle body. This will leak down a little bit, but again you are listening for external leaks.
Most likely you have a broken seam at the intercooler or a split hose that does not make itself known until under pressure.
Happy hunting
1) It seems you are saying you do have boost gauge. Does it read vacuum?
2) Report back your vacuum reading at idle. 16 in Hg is about right for a healthy engine. Less than this you may have a weak engine or a leak. You may need to convert units.
3) MOST IMPORTANTLY: Check for boost leaks. You'll need to put together a boost leak checker. Google it.
A quick example I found:
How To: Boost leak tester for $5.02 - evolutionm.net
Basically you just need to put pressure into the system (bike pump works) and listen for hisses. Any noise and you have a leak. Try to pump it up to 1 bar to simulate the system under pressure.
When I do this I typically pull off the intake to the turbo INLET and the other end is blocked by the throttle body. This will leak down a little bit, but again you are listening for external leaks.
Most likely you have a broken seam at the intercooler or a split hose that does not make itself known until under pressure.
Happy hunting
05-07-14, 10:17 PM
#12
cbrok is dead nuts right on that vac comment.
i googled it and the hT18 is supposedly a 60mm inlet. however i can't determine if that ID or OD. either way i think a 2.5in hose coupler would work. its close enough that if its big it can be snugged down or jammed on.
i googled it and the hT18 is supposedly a 60mm inlet. however i can't determine if that ID or OD. either way i think a 2.5in hose coupler would work. its close enough that if its big it can be snugged down or jammed on.
05-07-14, 11:55 PM
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I used a "dead end" plumbing cap and a tire valve.I also put a Pool gauge on the cap to monitor how much PSI went into the system.
You can get the cap to fit pretty well anything with various step down/up silicone couplers.
there was a company called "fighters-Garage" that sold stuff like this.I actually copied that design for my Tester,Then the Damn tester came in the mail..!
I can't seems to find them on the Internet search though.
You can get the cap to fit pretty well anything with various step down/up silicone couplers.
there was a company called "fighters-Garage" that sold stuff like this.I actually copied that design for my Tester,Then the Damn tester came in the mail..!
I can't seems to find them on the Internet search though.
Last edited by misterstyx69; 05-07-14 at 11:57 PM.
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