will performance exhuast over rev the turbo?
- Thread starter gsrtype1
- Start date
well for one like i said if your mechanic installs exhausts for diesel trucks im sure he has done exhaust breaks. it is basically the opposite of an exhaust cut out. basically it just about completely blocks off the exhaust path. see how good that will do to a regular turbo car ie not a turbo diesel truck. it doesn't have to do with the brakes directly. it stops the exhaust flow on a turbo diesel truck as much as possible to slow down the motor so you hardly use your brakes but that is made for the diesel trucks. that is one simple explanation on how turbo diesel trucks fuction is way different from a regular turbo vehicle.
i also have another fren who has a ford turbo diesel also with a bully dog chip and 5 inch turbo back exhaust and races it down the drags he does pretty good he hits 14.2 down the quarter mile. he has been racing this truck for over 1 yr. and he hasn't blown his turbo yet.
on our fords when doing a exaust brake you also need a touqe converter locker to be able to stop the truck with the engine (for automatics)
I also think there is a good strong corelation between the red necks that throw on 4 or 5 inch exaust will ALSO put on power chips and THAT will blow up our turbos or croak the oil in them.
somthing that was desingend to spin will spin. its not a reciprocating part. if its got good cool oil it will be fine. desils dont run a blow off valve. alot of red necks dont understand turbo back wash and almost all of the chips produce some level of that. your mecanic just might be a red neck.
please stop talking about deisels and continue with rice(cheers2)
I also think there is a good strong corelation between the red necks that throw on 4 or 5 inch exaust will ALSO put on power chips and THAT will blow up our turbos or croak the oil in them.
somthing that was desingend to spin will spin. its not a reciprocating part. if its got good cool oil it will be fine. desils dont run a blow off valve. alot of red necks dont understand turbo back wash and almost all of the chips produce some level of that. your mecanic just might be a red neck.
please stop talking about deisels and continue with rice(cheers2)
ive been reading the thread and thats your opinion that the turbo cant rev to forever and never where out .... how do you know that? other people say it will on this thread so who to belive? like clos561 was saying maybe getting a better blowoff valve will help
use common sense
HOW does an engine run? it needs fuel, spark, AIR... all of which needs a fine balance to run properly... it's called the AIR-FUEL RATIO
WHAT does the stock ECU do? ASSUMES you've done NOTHING to the motor
WHAT happens when you raise the boost? add more AIR
WHAT happens when you add more air? **** up this "balance" called AIR-FUEL RATIO
WHAT happens when this "balance" is ****** up? either the motor runs bad or BLOWS UP
stop being a tool and THINK
if you want to be in disbelief over what I and everyone else says, go right ahead... but stop posting more s*** in this thread because we said what we had to say and you're wasting our time at this point
HOW does an engine run? it needs fuel, spark, AIR... all of which needs a fine balance to run properly... it's called the AIR-FUEL RATIO
WHAT does the stock ECU do? ASSUMES you've done NOTHING to the motor
WHAT happens when you raise the boost? add more AIR
WHAT happens when you add more air? **** up this "balance" called AIR-FUEL RATIO
WHAT happens when this "balance" is ****** up? either the motor runs bad or BLOWS UP
stop being a tool and THINK
if you want to be in disbelief over what I and everyone else says, go right ahead... but stop posting more s*** in this thread because we said what we had to say and you're wasting our time at this point
after market blow off valve should keep the turbo within its limits..i had the cai with stock bpv and then with hks recirc it was alot louder meaning it released more air from the piping leaving less stress on the turbo..many people say u dont need to change the valve but it definitely helps the turbo ALOt since MORE AIR is released
zoom-zoomhatch
Member
- :
- Cosmic Blue MS3
It doesn't mean it's letting more air out cause it's louder, it's designed to make a noise when it blows off, that's generaly why people buy them. And I don't see how a BOV would help the car not over-rev the turbo(which I agree makes no sense) because it doesn't let off pressure till you let off the gas pedal.
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if u run vta then yes it make a bunch of unecessary noise...i cant imagine a company like hks making a bloff off valve that wouldnt improve over a PLASTIC bypass valve....these stock valves are made cheap for mass production which makes them easier to break. every one will do what they want of course but i think upgrading this is good because it releases mroe air sicne. i am running it recirc like many other guys on here..do what u want and believe what u want..end of the day its ur car and ur moneyzoom-zoomhatch said:
Capt Crunch
Member
clos561 said:
This is incorrect. An HKS valve does not release more air, it is not any better than the stock valve. The only reason to replace the valve from a performance standpoint is if the stock one is leaking, and I haven't heard that happen.
In fact, if the HKS valve vents to atmosphere, while it sounds like it's doing good, it in fact is not because the MAF is expecting to read the vented air causing you to run temporarily rich.
Capt Crunch
Member
gsrtype1 said:
Dude, don't get mad because we're not telling you what you want to hear. Wearing out the turbo should be the least of your concerns. We're telling you that you should be worried about boost creep, which will make your motor blow long before your turbo craps out.
A possible reason why it's a problem on deisels could be because deisel motors can withstand a nuclear bomb. They don't use spark plugs, they explode the fuel/air misxture just by compression, so they have to be incredibly strong. It could be that the boost pressure is raised a huge amount on the deisel, the motor takes it and asks for more, but eventually the turbo wears out. That's my best guess.
Cliffs notes: Buy a catback, you should be fine. You shouldn't buy a BOV unless you want the noise (and the associated problems)
iracemine said:
are you talking to me. im just putting a simple explanation of how a turbo diesel works completely differently to a turbo car. Also im in hawaii brah we don't have red necks doing this stuff. the shop that runs all of this stuff is asc certified first of all second of all knows all of his equipment has all kinds of facts of what needs to be done if exhaust and chips and other stuff is put on. factory sends those bully dog chips with presets that is safe for the diesel. what you think they gonna send it so you can blow their turbo yah good one. just a bigger exhaust fry the turbo no don't think so. i have more frenz here with trucks that has been using their trucks as meer toys if it breaks it breaks merely cuz they have rich mom's and dads and it is their play toys. you have no idea of what kind of 4 wheel drive terrain we have here. oh yea is the ms3 automatic no. i said a exhaust break and didn't involve your torque converter simply cuz its not an automatic. like i said earlier your senstive ass red neck trucker can just chill the hell out and mind your buisness it has nothing to do with you and your trucks. it was a mere explanation on how a diesels are irrelavant to ms3 motor. also why don't you mention the dodge i posted about also?:flip:
www.cp-e.com
Member
I just wanted to clarify a few things here and then I'll leave you guys alone 
Blow off valves, like Capt Crunch was saying, aren't going to keep you from overspinning your turbo. In fact, they're purpose is exactly the opposite: They keep the turbo spinning between shifts. Moreover, a blow off valve only operates when you close the throttle, and since overboosting is only going to occur when you're under throttle, a BOV won't be of any help. A BOV is meant to release pressure in the intake tract when you close the throttle plate to shift.
Some cars have problems with boost creep because the wastegate isn't large enough. Since the exhaust is what spins the turbine, the wastegate is there to divert exhaust gas and keep the turbine from overspinning. Eventually you reach a point where you're flowing so much exhaust volume that the wastegate can't divert enough of it, and the turbine speed increases uncontrollably. We haven't reached that point yet, and we probably never will since this turbo is pretty much tapped as it sits. So this is really a non-issue for the SPEED3/6/CX7 guys with stock turbos.
Combine this with the fact that we've seen literally hundreds of SPEED3/6 cars running turboback exhaust systems (including ours and our competitor's products), some with no mufflers or cats, and I have not heard of any complaints about overboosting. So the short answer is "no," you really don't have to worry about making too much boost or destroying your turbo with exhaust modifications.
Jordan
Blow off valves, like Capt Crunch was saying, aren't going to keep you from overspinning your turbo. In fact, they're purpose is exactly the opposite: They keep the turbo spinning between shifts. Moreover, a blow off valve only operates when you close the throttle, and since overboosting is only going to occur when you're under throttle, a BOV won't be of any help. A BOV is meant to release pressure in the intake tract when you close the throttle plate to shift.
Some cars have problems with boost creep because the wastegate isn't large enough. Since the exhaust is what spins the turbine, the wastegate is there to divert exhaust gas and keep the turbine from overspinning. Eventually you reach a point where you're flowing so much exhaust volume that the wastegate can't divert enough of it, and the turbine speed increases uncontrollably. We haven't reached that point yet, and we probably never will since this turbo is pretty much tapped as it sits. So this is really a non-issue for the SPEED3/6/CX7 guys with stock turbos.
Combine this with the fact that we've seen literally hundreds of SPEED3/6 cars running turboback exhaust systems (including ours and our competitor's products), some with no mufflers or cats, and I have not heard of any complaints about overboosting. So the short answer is "no," you really don't have to worry about making too much boost or destroying your turbo with exhaust modifications.
Jordan
