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open downpipe bad for motor? - 6G Celicas Forums

Topic #67366 12 posts Started by 95st-celica
95st-celica
#1
well i have had 2 people tell me the same thing this week, and its starting to get me worried. my uncle and father both said that running an open downpipe isnt the greats for the motor. 1) because when its sucks back in cool air it starts to twist the fins on the turbo, and also its not to good for a valves and it will caus them to bend. i know i need an exhaust and thats next on the list, i dont want to drive it around with an open downpipe but right now i have no other choice. i just wanted to see if anyone on here has ever heard of this happening or if it has heppened to them. as soon as i get som money together i will get one put on, but right now theres not much i can do. any comments and suggestions are more then welcome..i would like to hear a couple oppinions on the matter. Thanks
I"M NOT A TOYOTA FAN, IM A FANATIC1984 accord hatch 5 speed (T-Belt)-Junkyard1991 VDUB jetta wolfsburg Ed. 5 speed (clutch)-junkyard1988 Dodge Aries K (sold)1969 Chevy El camino - Traded for celica1991 Dodge Daytona-Traded for Celica1988 Chevy Camaro-Work in Progress1989 Ford Mustang LX 5.0 - For Sale1995 Toyota Celica-Work in Progress
Batman722
#2
I would have to say no. On this motor back pressure is a bad thing and a free flowing exhaust is good.
my st205 swapandour Beams swap
95st-celica
#3
>
QUOTE (Batman722 @ May 14, 2009 - 3:07 PM) *
>I would have to say no. On this motor back pressure is a bad thing and a free flowing exhaust is good.


yea thats what i was thinking...i mean i could see on a regular 4 banger running an open header wouldnt be good because it would be easier for cold air to get up in there and hit the valves, but im thinking with a turbo it has to go past that then into the motor. i just wanted to make sure, because the last thing i need are bent vlaves or a twisted turbine mad.gif
I"M NOT A TOYOTA FAN, IM A FANATIC1984 accord hatch 5 speed (T-Belt)-Junkyard1991 VDUB jetta wolfsburg Ed. 5 speed (clutch)-junkyard1988 Dodge Aries K (sold)1969 Chevy El camino - Traded for celica1991 Dodge Daytona-Traded for Celica1988 Chevy Camaro-Work in Progress1989 Ford Mustang LX 5.0 - For Sale1995 Toyota Celica-Work in Progress
lagos
#4
As I said before, its a myth. Its also impossible for any cold air to get into your exhaust valves because there is a turbo at the exhaust manifold that would prevent anything like that from happening. Not to mention that the exhaust side of the turbo is ceramic and its impossible for ceramic to bend or deform due to a temperature change like steel does.
But get your exhaust done asap, cause that **** is crazy loud and youll get a ticket if you keep driving it like that.
15PSI - 30MPG - Megasquirt Tuned
95st-celica
#5
alright good deal...i know this arthur! lol
I"M NOT A TOYOTA FAN, IM A FANATIC1984 accord hatch 5 speed (T-Belt)-Junkyard1991 VDUB jetta wolfsburg Ed. 5 speed (clutch)-junkyard1988 Dodge Aries K (sold)1969 Chevy El camino - Traded for celica1991 Dodge Daytona-Traded for Celica1988 Chevy Camaro-Work in Progress1989 Ford Mustang LX 5.0 - For Sale1995 Toyota Celica-Work in Progress
presure2
#6
on a turbo motor, the best exhaust is no exhaust.
Former Team 5SFTE pro member ;)13.6@108MPH, 5SFTE Powered
95st-celica
#7
>
QUOTE (presure2 @ May 14, 2009 - 3:57 PM) *
>on a turbo motor, the best exhaust is no exhaust.


thats what i live by...literally..lol
I"M NOT A TOYOTA FAN, IM A FANATIC1984 accord hatch 5 speed (T-Belt)-Junkyard1991 VDUB jetta wolfsburg Ed. 5 speed (clutch)-junkyard1988 Dodge Aries K (sold)1969 Chevy El camino - Traded for celica1991 Dodge Daytona-Traded for Celica1988 Chevy Camaro-Work in Progress1989 Ford Mustang LX 5.0 - For Sale1995 Toyota Celica-Work in Progress
domyz
#8
IT IS very bad as your boost could be up tu 30psi for a short time, I recorded that peak on my boost controller when my last front pipe broke
trdproven
#9
my friends with good hp do not run an exhaust - they have real good times but of course they have turbo. I wouldn't do it on a low hp na motor.
94 Celica GT|Toyota OEM Japan|Toyota Racing Development|Tom's|Competition Clutch|5Zigen|Apexi||Laille/Beatrush|Magnecor|Denso|Royal Purple|Optima|PIAA|PW JDM|Megan Racing|Nitto||Work|Greddy|Samco|Project Mu|H&R|Gates|Moog|Rota|Yokohama|Epman|1320|Upgr804 Celica GT|Toyota OEM Japan|Toyota Racing Development|Tein|BC Racing|Greddy|89 Supra (Sold)90 Supra (Sold)
Defgeph
#10
>
QUOTE (presure2 @ May 14, 2009 - 2:57 PM) *
>on a turbo motor, the best exhaust is no exhaust.



Damn straight!
I will return one day.
presure2
#11
>
QUOTE (Defgeph @ May 14, 2009 - 4:03 PM) *
>>
QUOTE (presure2 @ May 14, 2009 - 2:57 PM) *
>on a turbo motor, the best exhaust is no exhaust.



Damn straight!

even IF it makes you def! laugh.gif
Former Team 5SFTE pro member ;)13.6@108MPH, 5SFTE Powered
95celgt
#12
gte sounds so rowdy with open DP!!! rocked it for about a week lol
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