Exhaust restrictor plate diameter ?
09-08-03, 08:10 AM
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Exhaust restrictor plate diameter ?
Anyone knows what would be a good diameter for a restrictor plate in the exhaust to avoid boost creep ?
I installed intake system this past weekend and with the setup in my sig I am having trouble keeping boost below 10psi, even with ProfecB dialed all the way back (whereas before it was set to 4 o'clock).
I read that 2 1/4" diameter worked for some (suprfast), but would like to get a second opinion. I will most likely install a high-flow cat next year.
I installed intake system this past weekend and with the setup in my sig I am having trouble keeping boost below 10psi, even with ProfecB dialed all the way back (whereas before it was set to 4 o'clock).
I read that 2 1/4" diameter worked for some (suprfast), but would like to get a second opinion. I will most likely install a high-flow cat next year.
09-08-03, 08:17 AM
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On my FC, the DSV (stock boost controller) wasn't working, and I ran 5.5 lbs with an intake and full turbo-back exhaust. The wastegate was sprung at 5.5 psi.
I would try that, see if you can disable the stock boost controller (is there one?) and run it at the psi that the wastegate is sprung at.
I would try that, see if you can disable the stock boost controller (is there one?) and run it at the psi that the wastegate is sprung at.
09-08-03, 09:28 AM
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Originally posted by Barwick
On my FC, the DSV (stock boost controller) wasn't working, and I ran 5.5 lbs with an intake and full turbo-back exhaust. The wastegate was sprung at 5.5 psi.
I would try that, see if you can disable the stock boost controller (is there one?) and run it at the psi that the wastegate is sprung at.
On my FC, the DSV (stock boost controller) wasn't working, and I ran 5.5 lbs with an intake and full turbo-back exhaust. The wastegate was sprung at 5.5 psi.
I would try that, see if you can disable the stock boost controller (is there one?) and run it at the psi that the wastegate is sprung at.
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09-09-03, 11:30 AM
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I was going to try the 2" diameter hole (since the 2.25" didnt help much) but again, as I previously stated. Get the Resonated MP. its anomoly! It flows well and stopped the spiking.
09-09-03, 02:46 PM
#10
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I didn't know resonated midpipe would stop spiking and boos creep. Can it be manually made ? Isn't it just a normal midpide with a hollow mid-muffler welded to it ? (sort of like hollowing the main cat)
