More info RJC Racing 5" DP

[buickpower]

Super6 is correct about the gas expansion/cooling as it goes downstream. Also, the lower the pressure on the exit side of the turbine in relation to the inlet, the easier the gas can expand through the turbine, which would make it easier to extract work from the exhaust at any given boost level. Plus where the exhaust first exits the turbine is critical, as the hot gases have to make an immediate turn, and the larger the radius the better. In theory this should make some sort of gain on large turbos, possibly in spool or power. I doubt it is intended for use on mildly modded street cars. Just my speculation. Maybe jason can chime in again to enlighten us further.

 

[Sydwyndr]

Super6 is correct about the gas expansion/cooling as it goes downstream. Also, the lower the pressure on the exit side of the turbine in relation to the inlet, the easier the gas can expand through the turbine, which would make it easier to extract work from the exhaust at any given boost level. Plus where the exhaust first exits the turbine is critical, as the hot gases have to make an immediate turn, and the larger the radius the better. In theory this should make some sort of gain on large turbos, possibly in spool or power. I doubt it is intended for use on mildly modded street cars. Just my speculation. Maybe jason can chime in again to enlighten us further.

Makes since. Would that sorta be the same thing as an expansion chamber for a 2-stroke?? Or am I wrong.

 

[Lhorn]

Agree with Buickpower. Probably would help to have a larger radius in making the turn. It's gotta be major overkill for 98% of cars though. Has a bit of bling factor though.

 

[buickpower]

Would that sorta be the same thing as an expansion chamber for a 2-stroke?? Or am I wrong.

Well, the shape is the similar, but it serves a different purpose on a two stroke. Two stroke pipes have the shape they do in order to take advantage of pressure waves that are bouncing back and forth between the end of the pipe and the exhaust port. At certain rpm ranges when the timing is correct, you get scavenging, which boosts power. The shape and length of the pipe is just to alter the strength and speed of the scavenging waves. Normally aspirated four stroke cars use those waves in a somewhat different manner, but with the same principal of using pressure waves to scavenge the cylinder, especially during the overlap period. Our cars don't have that benefit in the exhaust system however, because the turbo basically chops all the waves up, making them useless.

 

[88ZNX]

The Big Down Pipe

Gosh dangit Jason you are the man. That is so cool , I wouldnt care if it didnt go any faster .That thing looks awsome and intimdating.I might just have to have one just for looks. :biggrin:

 

[wiked87gn]

Gosh dangit Jason you are the man. That is so cool , I wouldnt care if it didnt go any faster .That thing looks awsome and intimdating.I might just have to have one just for looks. :biggrin:

Typical ricer mentality put on parts that wont make you go any faster but look good., why dont you Glue on a few stickers while your at it maybe they will give you a few Xtra Horse Power too..

 

[Antagon]

Typical ricer mentality put on parts that wont make you go any faster but look good., why dont you Glue on a few stickers while your at it maybe they will give you a few Xtra Horse Power too..

So i'm sure everything on your car is 100% performance and 0 appearance? Any chrome or polished alum under the hood? Give it a break...

I'm wondering how this sounds compared to a 3in.

 

[ChrisChow]

Nice!
I like how you integrated a bolt-in adapter to the band clamp.

 

[gnxtc2]

I've seen the pro-type at BG this past Nats, looks awesome. I want one also. But will it be legal for the classes at BG the coming year?

Billy T.
gnxtc2@aol.com

 

[PCS74]

Given that the pipe diameter is about 2" larger than your average downpipe and you still have the same amount of space to work with I seriously doubt the bend radius has been increased.

He has probably found that increasing pipe area offers greater gains than bend radius at this point in the system.



Chris S

 

[88ZNX]

Typical ricer mentality put on parts that wont make you go any faster but look good., why dont you Glue on a few stickers while your at it maybe they will give you a few Xtra Horse Power too..



No offence to RJC on this thread, but it is a shame when you are trying to complement someone on thier craftsmanship, and get bashed by some "MILF" walkin' around in the shadows of a Valley somewhere? plus driving a car with all of the bolt on's listed in your profile while bragging about his 7.6's in the 1/8 times, when my wife's bone stock Mercedes SLK AMG 32 Supercharged V6 can smoke that on 6psi with the A/C on. No one pulled your chain pal, there is 24 other posts on here saying the same thing about his DP. Why did you single me out?! Further more I dont like Uncle Bens.

 

[wiked87gn]

dude melow out , i am not here to dispute RCJ's craftmanship ethier, i just personally think that the thing is ridicously big, furthermore how much did you wife SLK cost, compared to my GN, lets not go there, furthermore i am not a hardcore drag racer like most people who own this cars are i ran 7.6 yes and proud of it with only 18 psi, and trust me i have had my share of SLK's with V8's not V6's for lunch breakfast and dinner here in LA, i have a friend who paid over 125k for this V8 supercharged SLK running 10psi and he saw the nice square lights of my GN from very far behind when we race, if your on the rag at this very moment take your mod swings and shove em where the sun dont shine no offense..



No offence to RJC on this thread, but it is a shame when you are trying to complement someone on thier craftsmanship, and get bashed by some "MILF" walkin' around in the shadows of a Valley somewhere? plus driving a car with all of the bolt on's listed in your profile while bragging about his 7.6's in the 1/8 times, when my wife's bone stock Mercedes SLK AMG 32 Supercharged V6 can smoke that on 6psi with the A/C on. No one pulled your chain pal, there is 24 other posts on here saying the same thing about his DP. Why did you single me out?! Further more I dont like Uncle Bens.[/QUOTE]

 

[broke1]

dude melow out , i am not here to dispute RCJ's craftmanship ethier, i just personally think that the thing is ridicously big, furthermore how much did you wife SLK cost, compared to my GN, lets not go there, furthermore i am not a hardcore drag racer like most people who own this cars are i ran 7.6 yes and proud of it with only 18 psi, and trust me i have had my share of SLK's with V8's not V6's for lunch breakfast and dinner here in LA, i have a friend who paid over 125k for this V8 supercharged SLK running 10psi and he saw the nice square lights of my GN from very far behind when we race, if your on the rag at this very moment take your mod swings and shove em where the sun dont shine no offense..



No offence to RJC on this thread, but it is a shame when you are trying to complement someone on thier craftsmanship, and get bashed by some "MILF" walkin' around in the shadows of a Valley somewhere? plus driving a car with all of the bolt on's listed in your profile while bragging about his 7.6's in the 1/8 times, when my wife's bone stock Mercedes SLK AMG 32 Supercharged V6 can smoke that on 6psi with the A/C on. No one pulled your chain pal, there is 24 other posts on here saying the same thing about his DP. Why did you single me out?! Further more I dont like Uncle Bens.

[/QUOTE]


OK assshole,youve already made it clear that you have no need for a 5" dp and wouldnt buy one.

So why are you trying to screw up those who plan on buying them???

New rule from here on out,if youre not going to buy somthing,KEEP YOUR ****ING MOUTH SHUT!!!

 

[wiked87gn]

HAHAHAHAHAHAHAHAHAHA.. Temper, Temper.. come down now boy.



OK assshole,youve already made it clear that you have no need for a 5" dp and wouldnt buy one.

So why are you trying to screw up those who plan on buying them???

New rule from here on out,if youre not going to buy somthing,KEEP YOUR ****ING MOUTH SHUT!!![/QUOTE]

 

[broke1]

HAHAHAHAHAHAHAHAHAHA.. Temper, Temper.. come down now boy.




OK assshole,youve already made it clear that you have no need for a 5" dp and wouldnt buy one.

So why are you trying to screw up those who plan on buying them???

New rule from here on out,if youre not going to buy somthing,KEEP YOUR ****ING MOUTH SHUT!!!

[/QUOTE]

Yea,I got your ****in boy right here.

Go suck Wells dick and leave the hipo part of this hobby to those of us who will spend the $$$ to go fast and support vendors who come out with new parts for us.

 

[wiked87gn]

ok Broke1 (white trash), as your name implies, if you see my signature you can see probably that i am a walking adversiment for almost all the vendors on this board where did you come up with me not supporting the vendors wiseguy..think before you speak..enought said, i am done with this thread.

 

[Joe Tiano]

clint..you ask a VALID question...and the answer to your first post is...IMO ..minimal @ best..I "ran" the "theroy" past a few guys from a well known NEXTEL cup team that have built exhaust systems for about every type of race car known to mankind!...F1 to unlimited hydro's from the piston era...but ya never can tell these days...have a good day! joe

 

[Sydwyndr]

clint..you ask a VALID question...and the answer to your first post is...IMO ..minimal @ best..I "ran" the "theroy" past a few guys from a well known NEXTEL cup team that have built exhaust systems for about every type of race car known to mankind!...F1 to unlimited hydro's from the piston era...but ya never can tell these days...have a good day! joe

Thanks Joe...
I would like to see some kinda of open dump back pressure readings out of the turbo between this and a 3.5 pipe. I know that bigger is not always better, It is however a well engineered, very nice looking piece that truly will be for a racecar and not for the street IMO. Its all about the actual facts for me.

Joe, you plan on going to Myrtle Beach with us??

 

[88ZNX]

I didnt like being called a ricer. I am a die hard GM man and a hard core racer, so i got a little affended. I dont want to make any enemies on this site.

 

[mec108]

Jason; What is the projected price??? ROUGHLY