Thanks Patrick G Nice Gain with Flowmaster Merger Y Pipe.
03-19-2009, 10:22 AM
#61
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You have to think about two 3" pipes merging into each other. The combined area of two 3" pipes from your Y-pipe would be 14.13 square inches. If you have a 3" I-pipe, you have an area of 7.065 square inches. Which now means you are dumping a combined 3" Y-pipe into 7 square inches, or basically halving the output. If you were to merge into a 4" I-pipe, the 4" I-pipe has a area of 12.56 square inches. The 4" pipe has 43% more area than the 3" pipe. It also almost matches the output of two 3" pipes, which will greatly increase exhaust flow. Also just for reference, a 3.5" I-pipe would only have an area of 9.6163 square inches. The 4" pipe still has 23% more area.
If you want to check the math, Area of a Circle, A = Pi * r * r. In this case, we are dealing with diameter, so you would first convert diameter to radius ... d / 2 = r.
03-19-2009, 11:09 AM
#62
He didn't gain that just from a merge, he gained that from the merge, and I-pipe together. Having a 4" I-pipe greatly increases exhaust flow, and will allow maximum power for a Y-pipe. Someone posted the correct math before, but I will explain it a little more.
You have to think about two 3" pipes merging into each other. The combined area of two 3" pipes from your Y-pipe would be 14.13 square inches. If you have a 3" I-pipe, you have an area of 7.065 square inches. Which now means you are dumping a combined 3" Y-pipe into 7 square inches, or basically halving the output. If you were to merge into a 4" I-pipe, the 4" I-pipe has a area of 12.56 square inches. The 4" pipe has 43% more area than the 3" pipe. It also almost matches the output of two 3" pipes, which will greatly increase exhaust flow. Also just for reference, a 3.5" I-pipe would only have an area of 9.6163 square inches. The 4" pipe still has 23% more area.
If you want to check the math, Area of a Circle, A = Pi * r * r. In this case, we are dealing with diameter, so you would first convert diameter to radius ... d / 2 = r.
You have to think about two 3" pipes merging into each other. The combined area of two 3" pipes from your Y-pipe would be 14.13 square inches. If you have a 3" I-pipe, you have an area of 7.065 square inches. Which now means you are dumping a combined 3" Y-pipe into 7 square inches, or basically halving the output. If you were to merge into a 4" I-pipe, the 4" I-pipe has a area of 12.56 square inches. The 4" pipe has 43% more area than the 3" pipe. It also almost matches the output of two 3" pipes, which will greatly increase exhaust flow. Also just for reference, a 3.5" I-pipe would only have an area of 9.6163 square inches. The 4" pipe still has 23% more area.
If you want to check the math, Area of a Circle, A = Pi * r * r. In this case, we are dealing with diameter, so you would first convert diameter to radius ... d / 2 = r.
03-19-2009, 11:30 AM
#63
I have the same Spohn TQ. It will fit in there, I have the 3 in 4 out setup, and it fit, barely. You have to put the merge in there, and then cut accordingly. I'm not sure how far your Y goes back into the loop.
I had a custom piece done, that looks like ****, so I'm about to do it with the Eldebrock Y. Plan is to cut that Y right where it merges, place the Flowmaster Y where it fits best, and then cut pieces to bridge the gap. I'll post up pics when I'm done.
I had a custom piece done, that looks like ****, so I'm about to do it with the Eldebrock Y. Plan is to cut that Y right where it merges, place the Flowmaster Y where it fits best, and then cut pieces to bridge the gap. I'll post up pics when I'm done.
03-19-2009, 11:33 AM
#64
Everything you say is true, but you also need to take into account the output of the motor to determine the most effective pipe size. Piping that is too big will cause loss of exhaust heat and velocity. Too much pipe for too little motor doesn't gain anything.
03-19-2009, 11:57 AM
#65
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Oh I agree. It just seems this setup works well for mild to highly modded LS1's. Let me rephrase, it is the best y-pipe setup I have seen on any modded LS1's to date.
03-19-2009, 12:01 PM
#66
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Make one. Look at Pat G's pictures on this page:
http://guerragroup.com/2000TA.htm
It is nothing more than a pipe that goes from the collector to the catback. The correct term is intermediate pipe, but I just say I-pipe for short. If you have the proper merge collector, it would be an easy swap, then just reduce it back down to 3" or whatever your catback size is.
http://guerragroup.com/2000TA.htm
It is nothing more than a pipe that goes from the collector to the catback. The correct term is intermediate pipe, but I just say I-pipe for short. If you have the proper merge collector, it would be an easy swap, then just reduce it back down to 3" or whatever your catback size is.
03-19-2009, 12:58 PM
#67
well i want to gain 10 RWTQ.. I already have a flowmaster merge 
Do you think that a 4" I pipe would be to much for my application? I do have a cam stock H/I
Here is my exhasut set up....
QTP LTs (1 3/4") + Kooks O/R Y Pipe (3'') + Flowmaster Merge (3" - 3.5") + GMMG c/b (I pipe is 3" and it necks down to 2 3/4")
Do you think that a 4" I pipe would be to much for my application? I do have a cam stock H/I
Here is my exhasut set up....
QTP LTs (1 3/4") + Kooks O/R Y Pipe (3'') + Flowmaster Merge (3" - 3.5") + GMMG c/b (I pipe is 3" and it necks down to 2 3/4")
03-17-2010, 10:44 AM
#75
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Well since this got bumped up, I was wondering how much this costs for an exhaust shop to do. I can figure on around $50 for the flowmaster merger and I already have a pacesetter ORY on the car, so what would it cost to have them chop it up and put it back together with the flowmaster merger and a bigger i-pipe?
03-17-2010, 01:06 PM
#76
I think it cost me ~$120 to have them weld in my V band clamps that I brought to them, and weld/fab in the flowmaster merge, which I got from them. They had some pre-made mandrel bends on their shelves so I didn't end up with any crush/wrinkle bent stuff.
I'd figure less than a hundred, for sure. But it better have mandrel bends for that kinda money.
I'd figure less than a hundred, for sure. But it better have mandrel bends for that kinda money.
04-04-2010, 01:13 PM
#78
we will see what my 3" to 4" flowmaster merge does...my y pipe looks worse than the one partick g posted...i will take some pictures tomorrow...looks to be bent over a knee...
i will have dyno results sometime soon maybe 3-4 weeks...shooting for around a 5rwhp gain...plus i am going to make it out of aluminum to drop some weight too...about 10lbs vs steel...
i will have dyno results sometime soon maybe 3-4 weeks...shooting for around a 5rwhp gain...plus i am going to make it out of aluminum to drop some weight too...about 10lbs vs steel...
04-09-2010, 08:36 PM
#80
Here's a pic of my 4" flowmaster merge fabbed into a pacesetter Y pipe:
and here's a bad picture of the ground clearance (stock ride height):
...and one under the merge:
...and one last one to show how decent the clearance can be on the drivers side. If I had only let the guys know that I had poly mounts then they probably would have tucked it up even higher (they must have run into some problems in the past with customers who insisted on clearance and stock engine mounts...).
Not the prettiest thing, but it works quite well!
and here's a bad picture of the ground clearance (stock ride height):
...and one under the merge:
...and one last one to show how decent the clearance can be on the drivers side. If I had only let the guys know that I had poly mounts then they probably would have tucked it up even higher (they must have run into some problems in the past with customers who insisted on clearance and stock engine mounts...).
Not the prettiest thing, but it works quite well!