only 6psi??
10-20-04, 12:44 AM
#1
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only 6psi??
hey there i just intalled my boost gauge today and the highest reading i am getting is 6psi in all gears, no higher at all
now i have 95 psi compression on both rotors, have a fcd, and a full 2.5 inch exhaust and downpipe with no cats on the car
but i am told that with a full exhaust i should be seeing about 8-9 psi... what could be wrong ? any ideas?
thanks
now i have 95 psi compression on both rotors, have a fcd, and a full 2.5 inch exhaust and downpipe with no cats on the car
but i am told that with a full exhaust i should be seeing about 8-9 psi... what could be wrong ? any ideas?
thanks
10-20-04, 01:25 AM
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Your dynomax exhaust is probably a restriction.. I have a full 3" exhaust, but only run 9PSI. But that's at 7K ft above sea level.. Try getting a cone filter and making a custom TID..
10-20-04, 01:28 AM
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yeah..must be the restrictive exhaust..with my 3 inch turbo back i was constantly seeing 9-10psi...woulda seen higher if i didnt let off the throttle.....any idea whats the OD on the pipe before the Y?....
10-20-04, 01:30 AM
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even with the stock WG i was seeing 9-10 with the boost creep....also...what rpm does the boost kick in?....i noticed a faster boost kickin also...so that might help u in determining the cause of ur problem
10-20-04, 01:36 AM
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well the only thing that is dynomax on the car is the muffler, the rest is all custom piping
what do u mean by what is the "OD" on the pipe before the Y?
i should be seeing higher psi u are all saying.. i wonder why so low.
what do u mean by what is the "OD" on the pipe before the Y?
i should be seeing higher psi u are all saying.. i wonder why so low.
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10-20-04, 01:37 AM
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it suppose it could be possible that the wastegate could have been ported... not likely but possible, the shop may have done it when they did the install? or when they took off the turbo before.. im not sure but could that affect it
10-20-04, 01:43 AM
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That is a possibility, but i doubt it myself.. I'm not a big fan of Dynomax products myself, and the boost will rise after the packing in the muffler is destroyed. 
10-20-04, 08:14 AM
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I would say it's the 2.5" exhaust. As you see, most get the higher numbers with the 3" exhaust. (s5) I run the 2.5" with DP and Bonez hi flow cat and factory mufflers and only saw @ 7lbs before the ecu upgrade which jumped it to 10/11 psi.
10-20-04, 08:53 AM
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Originally Posted by Turbonut
I would say it's the 2.5" exhaust. As you see, most get the higher numbers with the 3" exhaust. (s5) I run the 2.5" with DP and Bonez hi flow cat and factory mufflers and only saw @ 7lbs before the ecu upgrade which jumped it to 10/11 psi.
10-20-04, 11:00 AM
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Originally Posted by TwistedRotors
with RB turbo back exhaust, ported wastegate and cone filter I see about 6-7 psi and it will creep higher on cold nights.
10-20-04, 11:35 AM
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Originally Posted by Turbonut
I would say it's the 2.5" exhaust. As you see, most get the higher numbers with the 3" exhaust. (s5) I run the 2.5" with DP and Bonez hi flow cat and factory mufflers and only saw @ 7lbs before the ecu upgrade which jumped it to 10/11 psi.
-Joe
10-20-04, 12:17 PM
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i'm running 3" TID and for a while i ran with 2.5" open downpipe. It was loud as allz hell but all I could manage was 400mmHG on my stock gauge and .51 bar on my aftermarket gauge. I'm running no FCD, so my assumption is that my WG has been ported before i got the car. Maybe yours is ported also.
10-20-04, 12:53 PM
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i cant really think of any other explanation... my exhaust is as free flowing as u can get without having to muffler.... so it should be non restrictive
maybe ill install a MBC and just turn it up to 8 or 9
solve the problem... hopefully
today im installing a TID and my walbro and hopefully the MBC ill let u know what i see
thanks for all your replies guys
maybe ill install a MBC and just turn it up to 8 or 9
solve the problem... hopefully
today im installing a TID and my walbro and hopefully the MBC ill let u know what i see
thanks for all your replies guys
10-20-04, 04:23 PM
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I had the same exact problem...
So I took my wastegate line off AND the DP. I ran with an open DP and it still didn't make more then 6psi. Turned out it was a bum turbo. Replaced the turbo and voila - instant 10psi
David
So I took my wastegate line off AND the DP. I ran with an open DP and it still didn't make more then 6psi. Turned out it was a bum turbo. Replaced the turbo and voila - instant 10psi
David
10-20-04, 07:47 PM
#21
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dam... if its the turbo thats gonna SUCK cause i cant afford a new one
well i just installed a walbro 255 and in 3rd gear i saw about 7 or 8psi... so its a bit better.. maybe with a TID and boost controller i will see more?
well i just installed a walbro 255 and in 3rd gear i saw about 7 or 8psi... so its a bit better.. maybe with a TID and boost controller i will see more?
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