Aidan's loose oily bunghole actually runs a track lap
#8384
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^^ Delete that **** immediately, this thread is not allowed to contain useful information.
I know that Precision has 2.75" in/out, just run 2.75" from the outlet on the intercooler to the throttle body. Zero restriction baby!
I know that Precision has 2.75" in/out, just run 2.75" from the outlet on the intercooler to the throttle body. Zero restriction baby!
#8385
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I will probably make 2' and 2.5". Swap out on the dyno and see if i get gainz.
#8387
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You have a Precision 600, n00b.
On mine I feel like we did 2" between the turbo and intercooler and 2.5" between the intercooler and the throttle body, but stepped up to 2.75" in the vertical stretch after the sway bar to accommodate a 2.75" bend into the Skunk2 throttle body. My logic was velocity with hot air coming out of the turbo, and minimal restriction after the intercooler.
Some guys tend to be concerned with "too much volume" in the system causing lag, but I think some guys may not be members of the glorious EFR master race
On mine I feel like we did 2" between the turbo and intercooler and 2.5" between the intercooler and the throttle body, but stepped up to 2.75" in the vertical stretch after the sway bar to accommodate a 2.75" bend into the Skunk2 throttle body. My logic was velocity with hot air coming out of the turbo, and minimal restriction after the intercooler.
Some guys tend to be concerned with "too much volume" in the system causing lag, but I think some guys may not be members of the glorious EFR master race
#8389
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If you find a nicer tight radius 2.75" silicone 90° for the throttle transition, please let me know. I've never liked mine as its still too long, and I had to butcher it to make it fit. I hid my sins under the t-bolt clamps.
#8390
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Ok math. Instead of calculating what the engine can flow I'm going to go with what the turbo can flow. It won't give me an exact value. But it will give me a max flow at a boost level.
Soviet did 400whp at ~25psi of boost.
Pressure Ratio:
(25 + 14.7)/14.7 = 2.7
Looking at the 6758 compressor map at a pressure ratio of 1.7 the compressor can flow anywhere between .017kg/s and .40kg/s.
That is 22.4 lb/min and 53 lb/minn. So at 25psi I will be somewhere in that range.
General rule of thumb is like ~10lb/min to hp. So around 25psi, 400hp it should be in the ~40 lb/min range.
40 lb/min / .069 = 579cfm of air.
2" piping
1.57 x 2 = 3.14 sq in
300 cfm = 156 mph = 0.20 mach
400 cfm = 208 mph = 0.27 mach
500 cfm = 261 mph = 0.34 mach
585 cfm max = 304 mph = 0.40 mach
So 2" piping should be reasonable at least up to 25psi and 400hpish.
Worst (best?) case (compressor flowing the most for that pressure ratio) 2" will top out at 26.5psi. I doubt I will be flowing that much.
2" it is. It might choke up trying to hit 400. But I think it will be fine for 350whp. Which is what I'm probably going to try and hit the first time out.
Soviet did 400whp at ~25psi of boost.
Pressure Ratio:
(25 + 14.7)/14.7 = 2.7
Looking at the 6758 compressor map at a pressure ratio of 1.7 the compressor can flow anywhere between .017kg/s and .40kg/s.
That is 22.4 lb/min and 53 lb/minn. So at 25psi I will be somewhere in that range.
General rule of thumb is like ~10lb/min to hp. So around 25psi, 400hp it should be in the ~40 lb/min range.
40 lb/min / .069 = 579cfm of air.
2" piping
1.57 x 2 = 3.14 sq in
300 cfm = 156 mph = 0.20 mach
400 cfm = 208 mph = 0.27 mach
500 cfm = 261 mph = 0.34 mach
585 cfm max = 304 mph = 0.40 mach
So 2" piping should be reasonable at least up to 25psi and 400hpish.
Worst (best?) case (compressor flowing the most for that pressure ratio) 2" will top out at 26.5psi. I doubt I will be flowing that much.
2" it is. It might choke up trying to hit 400. But I think it will be fine for 350whp. Which is what I'm probably going to try and hit the first time out.
Last edited by aidandj; 01-19-2017 at 12:51 PM.
#8399
Ok math. Instead of calculating what the engine can flow I'm going to go with what the turbo can flow. It won't give me an exact value. But it will give me a max flow at a boost level.
Soviet did 400whp at ~25psi of boost.
Pressure Ratio:
(25 + 14.7)/14.7 = 2.7
Looking at the 6758 compressor map at a pressure ratio of 1.7 the compressor can flow anywhere between .017kg/s and .40kg/s.
That is 22.4 lb/min and 53 lb/minn. So at 25psi I will be somewhere in that range.
General rule of thumb is like ~10lb/min to hp. So around 25psi, 400hp it should be in the ~40 lb/min range.
40 lb/min / .069 = 579cfm of air.
2" piping
1.57 x 2 = 3.14 sq in
300 cfm = 156 mph = 0.20 mach
400 cfm = 208 mph = 0.27 mach
500 cfm = 261 mph = 0.34 mach
585 cfm max = 304 mph = 0.40 mach
So 2" piping should be reasonable at least up to 25psi and 400hpish.
Worst (best?) case (compressor flowing the most for that pressure ratio) 2" will top out at 26.5psi. I doubt I will be flowing that much.
2" it is. It might choke up trying to hit 400. But I think it will be fine for 350whp. Which is what I'm probably going to try and hit the first time out.
Soviet did 400whp at ~25psi of boost.
Pressure Ratio:
(25 + 14.7)/14.7 = 2.7
Looking at the 6758 compressor map at a pressure ratio of 1.7 the compressor can flow anywhere between .017kg/s and .40kg/s.
That is 22.4 lb/min and 53 lb/minn. So at 25psi I will be somewhere in that range.
General rule of thumb is like ~10lb/min to hp. So around 25psi, 400hp it should be in the ~40 lb/min range.
40 lb/min / .069 = 579cfm of air.
2" piping
1.57 x 2 = 3.14 sq in
300 cfm = 156 mph = 0.20 mach
400 cfm = 208 mph = 0.27 mach
500 cfm = 261 mph = 0.34 mach
585 cfm max = 304 mph = 0.40 mach
So 2" piping should be reasonable at least up to 25psi and 400hpish.
Worst (best?) case (compressor flowing the most for that pressure ratio) 2" will top out at 26.5psi. I doubt I will be flowing that much.
2" it is. It might choke up trying to hit 400. But I think it will be fine for 350whp. Which is what I'm probably going to try and hit the first time out.
lol