Who's in for a BEGi Down Pipe?
01-31-2007, 09:01 PM
#183
It's not a "challenge". Simply it is proof of concept. I'm personally not completely convinced the more complicated divoced wastegate type downpipe is better in a way that can be measure. I'm probably wrong, but would be cool to see a dyno, especially with spool data.
Jay
Jay
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01-31-2007, 10:14 PM
#184
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We have not dyno'd the car w/ the new d/p, but we will. I do have some comparision dynos on our website of the divorced wastegate downpipe vs. stock downpipe on an MSM though... It was good for 16 rwhp and ft-lbs torque. And an increase in torque in the lower rpm range.
As much as I would love to compare the downpipes, Corky would probably hurt me if I agreed to it. We just have too much to do and not enough time. I might be able to offer a discount to someone if they would like to do the testing themselves........ call or send a PM.
Stephanie
As much as I would love to compare the downpipes, Corky would probably hurt me if I agreed to it. We just have too much to do and not enough time. I might be able to offer a discount to someone if they would like to do the testing themselves........ call or send a PM.
Stephanie
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01-31-2007, 10:47 PM
#187
We have not dyno'd the car w/ the new d/p, but we will. I do have some comparision dynos on our website of the divorced wastegate downpipe vs. stock downpipe on an MSM though... It was good for 16 rwhp and ft-lbs torque. And an increase in torque in the lower rpm range.
As much as I would love to compare the downpipes, Corky would probably hurt me if I agreed to it. We just have too much to do and not enough time. I might be able to offer a discount to someone if they would like to do the testing themselves........ call or send a PM.
Stephanie
As much as I would love to compare the downpipes, Corky would probably hurt me if I agreed to it. We just have too much to do and not enough time. I might be able to offer a discount to someone if they would like to do the testing themselves........ call or send a PM.
Stephanie
I question the difference between the traditional bell mouth (ala Tony) and the BEGI divorced setup, when comparing similar sizes.
Jay
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02-01-2007, 07:14 AM
#188
+1, the question is whether it's worth spending the extra money over traditional 2.5" straight piping. i think we were are hoping the main pipe was going to be at leat 2.5" as well and not 2.25"
The comparison you refer to is between the stock MSM DP and the BEGI divorced setup right? I have no doubt that what you are building is better than what comes stock.
I question the difference between the traditional bell mouth (ala Tony) and the BEGI divorced setup, when comparing similar sizes.
Jay
I question the difference between the traditional bell mouth (ala Tony) and the BEGI divorced setup, when comparing similar sizes.
Jay
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02-01-2007, 08:06 AM
#189
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The comparison you refer to is between the stock MSM DP and the BEGI divorced setup right? I have no doubt that what you are building is better than what comes stock.
I question the difference between the traditional bell mouth (ala Tony) and the BEGI divorced setup, when comparing similar sizes.
Jay
I question the difference between the traditional bell mouth (ala Tony) and the BEGI divorced setup, when comparing similar sizes.
Jay
On the one-off's that I do, it's a lot easier to do a bell-mouth than run another seperate pipe for the wastegate (I've actually never done a divorced wastegate setup yet). I want to see what hp could be gained for the big increase in fab time.
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02-07-2007, 02:33 PM
#194
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I think the divorced wg style is going to be better than a bellmouth 2.5in dp.
1. Less turbulence in the exhaust stream
2. You have less exhaust volume in the downpipe right after the turbine since the gasses are seperate from one another. So even though you lose the 2.5in you have less exhaust volume to move. Plus Its only 2.25" for a short duration and then it moves right back into 2.5".
3. The 15G's biggest problem is a small turbine, increasing downpipe size from 2.5" - 3" might get you 100rpm or spool and less than 5whp if anything. The biggest restriction is the turbine wheel, so worrying about which downpipe is better really is pointless in my mind.
I would expect both downpipes to act very similar, but it would be interesting to test theories by doing a back to back dyno. I think that there would be little to no difference between the two...the BEGI piece would have better boost control though, since it has a divorced wg pipe.
1. Less turbulence in the exhaust stream
2. You have less exhaust volume in the downpipe right after the turbine since the gasses are seperate from one another. So even though you lose the 2.5in you have less exhaust volume to move. Plus Its only 2.25" for a short duration and then it moves right back into 2.5".
3. The 15G's biggest problem is a small turbine, increasing downpipe size from 2.5" - 3" might get you 100rpm or spool and less than 5whp if anything. The biggest restriction is the turbine wheel, so worrying about which downpipe is better really is pointless in my mind.
I would expect both downpipes to act very similar, but it would be interesting to test theories by doing a back to back dyno. I think that there would be little to no difference between the two...the BEGI piece would have better boost control though, since it has a divorced wg pipe.
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02-07-2007, 04:48 PM
#195
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No tuning yet. When I drove the car the yesterday AFR's were okay. Nothing way to far out of range. But I was not doing fast accelerations either.
The downpipe will allow for faster turbo spool up due to the divorced tube.
BUT, we have discovered a good problem in 1 of a 100 downpipes. It has the capability to flow so well, that in certain circumstances the boost is not controllable. **We have only had this problem on 2 MSM's.** One I think was just a bad car from the factory (it had all sorts of other problems too). The other has been custom modified to dump the w/g vent tube past the CAT into the exhaust. Not an everyday problem. So far, no problems w/ Greddy.
Stephanie.
The downpipe will allow for faster turbo spool up due to the divorced tube.
BUT, we have discovered a good problem in 1 of a 100 downpipes. It has the capability to flow so well, that in certain circumstances the boost is not controllable. **We have only had this problem on 2 MSM's.** One I think was just a bad car from the factory (it had all sorts of other problems too). The other has been custom modified to dump the w/g vent tube past the CAT into the exhaust. Not an everyday problem. So far, no problems w/ Greddy.
Stephanie.
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02-07-2007, 04:57 PM
#196
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The greddy wastegate is notorious for being weak at holding high boost pressures to redline. Usually a helper spring cures the problem, i'm sure you'll see the same if boost is raised.
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