2 1/4" turbo crossover
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On The Tree
Joined: Apr 2010
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From: Philly
2 1/4" turbo crossover Has anyone used 2 1/4" tubing for their turbo crossover? It doesnt matter ther material.
I believe one of the sponsors (dont remember who) posted that some ppl make over 1000hp with 2 1/2" crossovers so I'm wondering if 600-650rwhp can be made using 2 1/4" tubing.
I believe one of the sponsors (dont remember who) posted that some ppl make over 1000hp with 2 1/2" crossovers so I'm wondering if 600-650rwhp can be made using 2 1/4" tubing.
I think the size of your engine has alot to so with it. I'd go with 2.5 just to be safe. I had a 2.25 crossover on my 383 SBC with a qtrim turbine wheel and had backpressure issues. I couldn't keep the headers sealed and when I checked the preturbine pressure it was almost 3:1.
Thread Starter
On The Tree
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From: Philly
Thanx for the replies guys!
8's on 2 1/4" tubing is crazy!
I figured to help combat backpressure that I would just use a bigger DP. I'm thinking of going tc78 on stock cubes with a 3 1/2" Dp. That way the exhaust wont be so choked. Def gonna be using a 44/46mm wg too.
The thing is, I wanna do to the whole turbo k-member thing rite now but time may not permit. I wanted to have the setup running for the summer. I was thinking of routing the passenger side under the stock k-member for now just to have the setup on the car.
I think that 2 1/4" tubing and a notched k-member might have to do if I plan on doing this soon.
The 2 1/4" will prolly make the turbo spool pretty fast.
8's on 2 1/4" tubing is crazy!
I figured to help combat backpressure that I would just use a bigger DP. I'm thinking of going tc78 on stock cubes with a 3 1/2" Dp. That way the exhaust wont be so choked. Def gonna be using a 44/46mm wg too.
The thing is, I wanna do to the whole turbo k-member thing rite now but time may not permit. I wanted to have the setup running for the summer. I was thinking of routing the passenger side under the stock k-member for now just to have the setup on the car.
I think that 2 1/4" tubing and a notched k-member might have to do if I plan on doing this soon.
The 2 1/4" will prolly make the turbo spool pretty fast.
TECH Apprentice
Joined: Jul 2002
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From: ca
Try a search with 2 1/4" piping in the forced induction page. There was a thread not to long ago about this topic. If memory serves, you will find tons of good info about running a 2 1/4 cross over pipe.
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On The Tree
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From: Philly
I seen those threads b4 and tried to find them. I was prolly typin in the thing tho. I"ll look aagain tho.
Goodlook!
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On The Tree
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From: Philly
Try mandrel-bends.com. They have a ton of stuff at fair prices. Not 100% sure if they will have 2 1/4" v-bands tho. Givem a try.
i do know one of the threads is about half way down on the 1st page of the force induction section.. just seen it this morning
thanks for the site i will look through them .
thanks for the site i will look through them .
Good topic, cause I was thinkin about this same ? , for my 5.3w317heads I think 2"or 21/4 should increase more fast spooling on a t4 turbo with a low CR around 8.4. And street friend drivability.
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From: Philly
Idk guys, I maybe cheaping out on the turbo k-member and notching the stock one for this setup.
The C6 manifolds have 2.25" outlets don't they? Consider the size of the inlet to the turbine then look at the size of the hole in the manifolds lol. I'm not worried. Above 1000whp, maybe.
I think the size of your engine has alot to so with it. I'd go with 2.5 just to be safe. I had a 2.25 crossover on my 383 SBC with a qtrim turbine wheel and had backpressure issues. I couldn't keep the headers sealed and when I checked the preturbine pressure it was almost 3:1.
Thanx for the replies guys!
8's on 2 1/4" tubing is crazy!
I figured to help combat backpressure that I would just use a bigger DP. I'm thinking of going tc78 on stock cubes with a 3 1/2" Dp. That way the exhaust wont be so choked. Def gonna be using a 44/46mm wg too.
The thing is, I wanna do to the whole turbo k-member thing rite now but time may not permit. I wanted to have the setup running for the summer. I was thinking of routing the passenger side under the stock k-member for now just to have the setup on the car.
I think that 2 1/4" tubing and a notched k-member might have to do if I plan on doing this soon.
The 2 1/4" will prolly make the turbo spool pretty fast.
8's on 2 1/4" tubing is crazy!
I figured to help combat backpressure that I would just use a bigger DP. I'm thinking of going tc78 on stock cubes with a 3 1/2" Dp. That way the exhaust wont be so choked. Def gonna be using a 44/46mm wg too.
The thing is, I wanna do to the whole turbo k-member thing rite now but time may not permit. I wanted to have the setup running for the summer. I was thinking of routing the passenger side under the stock k-member for now just to have the setup on the car.
I think that 2 1/4" tubing and a notched k-member might have to do if I plan on doing this soon.
The 2 1/4" will prolly make the turbo spool pretty fast.
On 2.5" tubes....
164.8mph to the 1/8 mile
4.70 on a 1.25 60'
7.29 to the 1/4 mile on a 4.84 1/8 mile and a 1.29 60'
I think 6's are possible with 2.5" tubes.
Backpressure is caused by your smallest point in the exhaust side which is the turbine by far. From smallest to largest or highest to lowest airspeed.
Turbine housing
Exhaust valve
Crossover
Header tube
Thread Starter
On The Tree
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From: Philly
On 2.5" tubes....
164.8mph to the 1/8 mile
4.70 on a 1.25 60'
7.29 to the 1/4 mile on a 4.84 1/8 mile and a 1.29 60'
I think 6's are possible with 2.5" tubes.
Backpressure is caused by your smallest point in the exhaust side which is the turbine by far. From smallest to largest or highest to lowest airspeed.
Turbine housing
Exhaust valve
Crossover
Header tube
164.8mph to the 1/8 mile
4.70 on a 1.25 60'
7.29 to the 1/4 mile on a 4.84 1/8 mile and a 1.29 60'
I think 6's are possible with 2.5" tubes.
Backpressure is caused by your smallest point in the exhaust side which is the turbine by far. From smallest to largest or highest to lowest airspeed.
Turbine housing
Exhaust valve
Crossover
Header tube
Im trying to picture this in my head and this is wut it looks like.
I may try that tc78 with 1.15 exhaust housing with 2" tubing. I cant see 2" being to small.
Do you have a TC78 off the car you could measure the radius?
Think of the turbine housing as a nozzle. You've got a preset amount of air going to it, its going to require a certain amount of time to develop the amount of drive pressure needed to spin the turbo. The larger the section between the turbine and motor, the more time and heat loss that occurs.
Think of the turbine housing as a nozzle. You've got a preset amount of air going to it, its going to require a certain amount of time to develop the amount of drive pressure needed to spin the turbo. The larger the section between the turbine and motor, the more time and heat loss that occurs.