Boost drop... uh oh.
06-24-2006, 04:06 AM
#1
Member
Thread Starter
Join Date: May 2006
Location: Canada, Alberta
Posts: 76
Hey guys, I was cruising in my 88 TII running at 10 psi with a friend tonight. We were going pretty hard.
It has:
s5 motor/turbo swapped
racing beat downpipe with pre-silencer
mazdaspeed exhaust
cone air filter (aftermarket: "Intimidator" or something..... not that fancy anyhow)
ported wastgate
running 94 octane gasoline (tank about 1/4 left)
Engine completly warmed up, stable temp.
I was in 4th gear at 10psi full throttle, foot to the floor.
At about 5000 rpm my boost started to drop (decrease, while still flooring) to like 5 or 4 psi, so i let go off the gas, and took it easy on the way home. Dont know if it would have dropped further more if I continured flooring it.
Still a turbo newby here....
what might be causing this?
Thanks.
It has:
s5 motor/turbo swapped
racing beat downpipe with pre-silencer
mazdaspeed exhaust
cone air filter (aftermarket: "Intimidator" or something..... not that fancy anyhow)
ported wastgate
running 94 octane gasoline (tank about 1/4 left)
Engine completly warmed up, stable temp.
I was in 4th gear at 10psi full throttle, foot to the floor.
At about 5000 rpm my boost started to drop (decrease, while still flooring) to like 5 or 4 psi, so i let go off the gas, and took it easy on the way home. Dont know if it would have dropped further more if I continured flooring it.
Still a turbo newby here....
what might be causing this?
Thanks.
06-24-2006, 06:13 AM
#2
Senior Member
Join Date: Jul 2002
Posts: 1,007
dude its like 5 am on saturday morning.
and on that note im sorry to say that there is absolutely nothing that i can do for you in this case, the fact that i have no fukin idea whats wrong with your car plays a big role along with it being 7 am and i just woke up., im sure someone here will have your answer though
and on that note im sorry to say that there is absolutely nothing that i can do for you in this case, the fact that i have no fukin idea whats wrong with your car plays a big role along with it being 7 am and i just woke up., im sure someone here will have your answer though
06-24-2006, 09:42 AM
#3
Senior Member
Join Date: Apr 2004
Location: Kincardine, Ontario Canada yeah Canada bitches
Posts: 1,068
It's bleeding off, the stock exhaust housing is too small to flow that much air at those rpm's, it's normal. Specially with the ported WG, I know when I had a non ported WG it would hold 11psi to redline in 4th.
06-24-2006, 06:28 PM
#6
Member
Thread Starter
Join Date: May 2006
Location: Canada, Alberta
Posts: 76
So I was under the impression it was bad, but I guess its a normal thing? So to maintain a constant boost around those RPM at that gear would be bad or better with a bigger exhaust housing?
Thanks for the replies.
yea, i think you should just get rid of the boost and solve your problem
get rid of the boost? haha what are you talking about?
Thanks for the replies.
Originally Posted by ChainSawOnSteroids' post='825863' date='Jun 24 2006, 09:44 AM
yea, i think you should just get rid of the boost and solve your problem
get rid of the boost? haha what are you talking about?
06-25-2006, 08:07 AM
#9
Senior Member
Join Date: Jul 2002
Posts: 1,007
Originally Posted by FC RotorHead' post='825923' date='Jun 24 2006, 07:28 PM
So I was under the impression it was bad, but I guess its a normal thing? So to maintain a constant boost around those RPM at that gear would be bad or better with a bigger exhaust housing?
Thanks for the replies.
get rid of the boost? haha what are you talking about?
you know do a turbo -> na conversion and your problems will be solved, if you really want ill even take the turbo off of your hands
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