back pressure on turbo car?

[nate6663]

im new to turbo cars and i want to finish my exhaust here soon. i hear that back pressure is terrible on turbo cars because the turbo already creates enough. so does this mean that a straight through 3" exhaust is better?

[JP]

i'm no expert, but less backpressure is good for turbo cars to an extent, you don't want to over-do it

3" turbo-back, run catless, with a good muffler (not 40 dollar ebay garbage) you should be a-ok, and free up some ponies.

take this as you like, im no expert.

[nate6663]

i understand. thanks for the info. and i love the srt! me and my dad tried to talk my mom into getting one but she got a malibu instead!:brickwall:

[Sonic]

i'm no expert, but less backpressure is good for turbo cars to an extent, you don't want to over-do it

3" turbo-back, run catless, with a good muffler (not 40 dollar ebay garbage) you should be a-ok, and free up some ponies.

take this as you like, im no expert.

Couldn't agree more. If you run without a cat plz do not use a straight through or 'fart can' muffler. I use to have a straight through muffler & almost zero back pressure on the Cobalt. After putting a 'normal' chambered muffler on I noticed a big difference. The Cobalt is supercharged tho not turbo so it could be totally different with your car. :dunno:

[nate6663]

yeah. my cat is already gone and its got a 3" stanless down pipe. and i noticed a big difference! i wanna finsh the rest of it and the thing that had me going striaght through is how on the srt4's you can hear the turbos spool and its sounds sweet!

[nate6663]

20 views yet no info?

[EVE_Motorsports]

The backpressure you are hearing about is between the head and turbo. You want to shoot for 1 to 1 but you won't get it and unless your a real smart cat you wouldn't be able to measure it anyway. The thing you do want to do is minimize any restriction in your downpipe that comes off your turbo and exits the car. Any restriction in your downpipe you can free up is added horsepower. Run the biggest pipe you can after the turbo and the least restrictive muffler you can get or stand to run.

Keep asking away, turbos are like voodoo and 98% of the time you will get a wrong answer. I'm not saying that most people aren't trying to help but it's way more complicated then you would think and reading on the internet doesn't even come close to real world experience when it comes to turbo's.

[Samickguy15]

There's technically a point in which your DP (downpipe) is too big and you'll get a nasty swirl effect which reduces efficiency. However, it's typically rather hard to fit that large of a pipe in a regular car. Fluid dynamics FTW!

No mufflers or a straight thru muffler is the only way to go, as long as it's not a fart can.

[Bdubs]

EVE might know a couple things about turbos. I agree, the least restrictive the better. It will help you make some more power and spool up time will be faster.

exhaust effects a turbo car is much different than a supercharged car.

[nate6663]

thats what i keep hearing. once i got the down pipe on it i noticed a huge difference in throttle respondes and power. and ever since i wanted to finish it all 3"

[JDMKyle]

Get a thermal r&d exhaust ;)

[nate6663]

im just going to have ryan do the pipe work and i wanna know what a good tip would be?

[JDMKyle]

http://www.thermalrd.com/
http://www.youtube.com/watch?v=uhz2Ga7ifIU

What I'm getting for mine

[nate6663]

well find me a place that has the muff part only. cause honestly i trust ryan more than some big company

[JDMKyle]

I don't think thermal sells just the muffler lol.
Most places don't.
I know HKS sells hi power mufflers, carbon/ti mufflers, things like that.
Not really sure what else is out there.. unless you want a magnaflow or something.
As far as I've heard tho thermal is the best of the best when it comes to turbo dsm exhaust.
But this is just what I have heard/my opinion.

[nate6663]

yeah im new to turbo applications. and im broke so you know that puts a dent in everything:brickwall:

[JDMKyle]

Yeah, thermals are pretty expensive.. although the pricing has gone down quite a bit.. i think it went from around 700 to 500ish.
I have seen them in action so that's why I stand behind them.
As far as mufflers I know greddy has some good stuff.. you could try to look and see if greddy sells the evo2 muffler seperate.. it's a pretty nice piece.

[dan boles]

Skaggs welded up a custom exhaust some years ago for my gst. Been going strong ever since. Cheap too, by comparison to these other options being thrown out.

[nate6663]

yeah he does good work. cheap to;)

[brockfuzzy69]

the general rule for a turbo car muffler
no chambered flowmaster style mufflers
and ideally you should be able to look straight though the muffler or a through core design

[nate6663]

so pretty much i was right. straight through is better

[Sick_lx]

so pretty much i was right. straight through is better

if so im in trouble. I have 3" o2 housing and downpipe catless all the way back to a murosso spiralflow muffler seems to work great for me. I think 3" straight through would be too loud for me. Mine is very loud with the muffler. Thats my opinion though.

[blue_pill85]

3" turbo back ftmfw

[nate6663]

i dont want it to be too loud but i wanna be able to hear the turbo spool and i wanna gain hp.

[Sohcgt96]

I've heard some very correct answers here.

You want the fewest bends and most open pipe you can for a turbo, chambered style mufflers don't work right behind a turbo. Shortest, straightest, largest pipe is pretty much always the answer.

[nate6663]

okey dokey. well ryan if you read this what do you have in mind?

[EVE_Motorsports]

if so im in trouble. I have 3" o2 housing and downpipe catless all the way back to a murosso spiralflow muffler seems to work great for me. I think 3" straight through would be too loud for me. Mine is very loud with the muffler. Thats my opinion though.

If a single 4" Magna Flow can make mine quiter then most Terminator Cobras then it would work wonders for your car. I'll be showing up at the Sonic cruise in EP after we pull it out of the East Peoria Convention Center if you want to hear it. I should be pulling out of there about 4:30 and we are heading straight to Sonic.

[EVE_Motorsports]

the general rule for a turbo car muffler
no chambered flowmaster style mufflers
and ideally you should be able to look straight though the muffler or a through core design

They don't call them Flowturds for nothing.


While we are on the subject.....................................Don't wrap or or ceramic coat a downpipe. If you have to do it only do it in the engine compartment and only do it to keep under hood temps in check. I know it's pretty but don't do it if you can help it.

Now the hotside is a completely different story, by all means coat or wrap it to retain as much heat as possible to help with spool up.

All those cool guy cold air intakes are great for the street but get rid of it when on the strip. Do you ever wonder why diesel trucks have a restriction guage on the air filter housing? Think about it for a second. You want the least amount of restriction you can get on the inlet side of the turbo. There is a reason on very big turbos and superchargers that guys don't run a filter.

[nate6663]

so wait wrapping is bad? i thought it helped?

[Sohcgt96]

so wait wrapping is bad? i thought it helped?

On the downpipe, I'm with this guy, I'm not seeing the logic there? I'm guessing there is a benefit to having the pipe radiate heat? I'd figure a ceramic coated pipe would always be a good thing.

[EVE_Motorsports]

On the downpipe, I'm with this guy, I'm not seeing the logic there? I'm guessing there is a benefit to having the pipe radiate heat? I'd figure a ceramic coated pipe would always be a good thing.

You want to keep the heat in the hot side but it needs to get out of the downpipe as fast as it can. Wrapping or coating it will not allow it to dissipate heat as fast. I know the whole part about hot air flowing faster then cold air but that's why you run as big a downpipe as you can fit. That's why I said turbo stuff is like Voodoo. What makes sense on any other combo doesn't work at all on a turbo car. We are about to swap to some 3.27 gears and I run 30" tall tires with a Powerglide...............................See what I mean?

[brockfuzzy69]

They don't call them Flowturds for nothing.
All those cool guy cold air intakes are great for the street but get rid of it when on the strip. Do you ever wonder why diesel trucks have a restriction guage on the air filter housing? Think about it for a second. You want the least amount of restriction you can get on the inlet side of the turbo. There is a reason on very big turbos and superchargers that guys don't run a filter.

if the turbo is spoolin really good you sure dont want it to suck the air filter up into the inlet and eat your intake wheel

i just hope that i am around saturday afternoon so i can see that sexxy beast

[country]

fyi nate i have a 3" straight through magnaflow stainless muffler that has your name on it for 20$$ :)

[JP]

fyi nate i have a 3" straight through magnaflow stainless muffler that has your name on it for 20$$ :)

nate, buy it. right now. or i'll be forced to have slippin kidney punch you

[brockfuzzy69]

fyi nate i have a 3" straight through magnaflow stainless muffler that has your name on it for 20$$ :)

he would be crazy not to get it

[Sohcgt96]

You want to keep the heat in the hot side but it needs to get out of the downpipe as fast as it can. Wrapping or coating it will not allow it to dissipate heat as fast. I know the whole part about hot air flowing faster then cold air but that's why you run as big a downpipe as you can fit. That's why I said turbo stuff is like Voodoo. What makes sense on any other combo doesn't work at all on a turbo car. We are about to swap to some 3.27 gears and I run 30" tall tires with a Powerglide...............................See what I mean?

The tall gearing I get, I just wouldn't have figured on the downpipe thing. Maybe having a bigger temperature differential between the in/out on the turbine gives the air a natural tendency to want to flow more.

[image4you2see]

Back pressure is never good on anything thats why i just put 1 7/8 primary headers with 3 1/2 collectors on my car and a more free flowing 3" exhaust with less curves in it..

WOOT WOOOT

[nate6663]

nate, buy it. right now. or i'll be forced to have slippin kidney punch you

trust me i want to but i dont have the money! :brickwall: fucking economy!

[Skullet]

its $20 man... lol... im gonna talk to my dad about havin ur gokart at his place in the country...

[nate6663]

fine by me. its not a bad go kart. just shim the axle right so the chain dont fall off every now and then.

[nate6663]

fyi nate i have a 3" straight through magnaflow stainless muffler that has your name on it for 20$$ :)

what kind of condition is it in? cause thats pretty cheap!

[mystryskittle]

chances are if country has it its in pretty good shape... you should buy cuz if you dont i am lol ;)

[djb1607]

Just get a cat back off ebay. On the 4g63t's they dont sound retarded at all catless either. If you ever hear Kapoosh's thats what yours should sound like. Clean and deap.

[JP]

just get a cat back off ebay. On the 4g63t's they dont sound retarded at all catless either. If you ever hear kapoosh's thats what yours should sound like. Clean and deap.

no cheap ebay catbacks please!!!!!

[Sick_lx]

Just get a cat back off ebay. On the 4g63t's they dont sound retarded at all catless either. If you ever hear Kapoosh's thats what yours should sound like. Clean and deap.

don't go the ebay route it ends up costing more in the long run. Trust me i made that mistake. Ive had rls fix my downpipe, cut and bend for it to fit right, and replace the mufler. So for the money ive spend on exhaust i could have bought the top of the line kit for the same money. Hey you live and you learn.

[Kapoosh1]

And for the record, my exhaust is not an ebay brand :)

[nate6663]

don't go the ebay route it ends up costing more in the long run. Trust me i made that mistake. Ive had rls fix my downpipe, cut and bend for it to fit right, and replace the mufler. So for the money ive spend on exhaust i could have bought the top of the line kit for the same money. Hey you live and you learn.

haha he had to do that to mine to! :dance:

[Skullet]

i wouldnt bother with a kit at all man... just get ya a decent muffler and have rls take care of the rest.

[image4you2see]

Ya keep buying Ebay crap that way muffler shops can actually make more money off of ya fixing someone elses screw up.. Or you could save yourself some time choose the muffler of your chose and take it to a professional like RLSRacing and have a way better fitment of an exhaust that is nice pipe and will last longer.

[Sticky91]

Hahaha This poor child....... So many opinions to choose from.

[djb1607]

And for the record, my exhaust is not an ebay brand :)
I know but mine sounded exactly the same as yours though and the cat back was from ebay.

[djb1607]

don't go the ebay route it ends up costing more in the long run. Trust me i made that mistake. Ive had rls fix my downpipe, cut and bend for it to fit right, and replace the mufler. So for the money ive spend on exhaust i could have bought the top of the line kit for the same money. Hey you live and you learn.

Sorry to hear that but my cat back was off ebay and fit perfect. Also my downpipe was from rls.

[nate6663]

fyi nate i have a 3" straight through magnaflow stainless muffler that has your name on it for 20$$ :)

if you still got this first pay check i get is yours!