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Old 02-08-2007, 12:56 AM   #201
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Don't you mean the opposite? On the Greddy's I've driven, the boost always tapers toward redline.
replace and with at.
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Old 02-08-2007, 09:24 AM   #202
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replace and with at.
Gotcha Sorry to be an internet hard-***.
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Old 02-12-2007, 01:52 PM   #203
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Bump for it being Monday and it getting dynoed In for results.
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Old 02-12-2007, 05:29 PM   #204
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Very interesting and mixed results. Same power #'s, but the fuel curve is very different, and the torque curve is somewhat smoother. The car went from very lean to very rich. So there is power to be gained once the fuel curve can be leaned out from 10:1.
Stephanie
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Old 02-12-2007, 05:31 PM   #205
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Interesting...
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Old 02-12-2007, 05:41 PM   #206
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The car went from very lean to very rich. So there is power to be gained once the fuel curve can be leaned out from 10:1.
Stephanie

:gay: yah think?
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Old 02-12-2007, 05:43 PM   #207
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Could the position of the O2 sensor account for the change in fuel?

So this was the new BEGI DP compared to the stock greddy unit? Nothing else besides the downpipe was changed?
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Old 02-12-2007, 10:01 PM   #208
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Would corky be willing to try out a 2.5" upper, and put the 2.75" pipe on the lower portion? Maybe just to give it a try. Also, was the intake tube on there also.
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Old 02-12-2007, 10:54 PM   #209
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Nothing changed on the car except the downpipe and position of the O2 sensor. And the O2 sensor was just rotated 90 degrees from the stock location. No inlet tube either. It was very strange. The only difference in run conditions was the humidity level. But even then.....
We may do another dyno run on it to see if it is consistent or a fluke.
Stephanie
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Old 02-12-2007, 11:01 PM   #210
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that AFR seems counter entuitive... I'd think with a better flowing downpipe you'd get leaner AFRs not richer. Unless the computer is closed loop and the O2 location made that large a difference it seems like the BEGi pipe may flow less. Which doesn't make since to me.

Stephanie, we're closing on a house on the 20th. Then I'll call you about the NC turbo I'm not allowed to spend any money until the mortgage is official.
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Old 02-13-2007, 12:12 AM   #211
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Very interesting and mixed results. Same power #'s, but the fuel curve is very different, and the torque curve is somewhat smoother. The car went from very lean to very rich. So there is power to be gained once the fuel curve can be leaned out from 10:1.
Stephanie

where's the boost graph?
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Old 02-13-2007, 12:24 AM   #212
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Nothing changed on the car except the downpipe and position of the O2 sensor. And the O2 sensor was just rotated 90 degrees from the stock location. No inlet tube either. It was very strange. The only difference in run conditions was the humidity level. But even then.....
We may do another dyno run on it to see if it is consistent or a fluke.
Stephanie
I wonder if the O2 sensor became damaged during the install? The results just don't make sense at all. I hope you guys run a couple more dyno runs. Could there have been something off with the AFR log on the first run?

Power levels are really strangly consistant between DP's.

Jay

PS- Thanks for the stickers!
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Old 02-16-2007, 12:24 PM   #213
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Mike
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Old 02-16-2007, 12:26 PM   #214
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yeah anyupdate on this, based on the information so far i don't they'll be getting too many orders
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Old 02-16-2007, 12:58 PM   #215
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Quote:
Originally Posted by Stephanie Turner View Post
Very interesting and mixed results. Same power #'s, but the fuel curve is very different, and the torque curve is somewhat smoother. The car went from very lean to very rich. So there is power to be gained once the fuel curve can be leaned out from 10:1.
Stephanie
I'm sorry if I'm slow here but what are these two graphs comparing? BEGI's divorced pipe against what? Stock greddy? If so, that's interesting.

And the "stock" location of the O2 bung, that's down by the transmission? I haven't seen a stock pipe in about 5 years, I forget. I know the GReddy downpipe has the sensor up by the turbo, right?
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Old 02-16-2007, 01:35 PM   #216
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I'm sorry if I'm slow here but what are these two graphs comparing? BEGI's divorced pipe against what? Stock greddy? If so, that's interesting.

And the "stock" location of the O2 bung, that's down by the transmission? I haven't seen a stock pipe in about 5 years, I forget. I know the GReddy downpipe has the sensor up by the turbo, right?
Stock for the 1.6L is in the manifold just before the downpipe, the 1.8L is in the front portion of the downpipe.
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Old 02-16-2007, 04:41 PM   #217
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I'm sorry if I'm slow here but what are these two graphs comparing? BEGI's divorced pipe against what? Stock greddy? If so, that's interesting.

And the "stock" location of the O2 bung, that's down by the transmission? I haven't seen a stock pipe in about 5 years, I forget. I know the GReddy downpipe has the sensor up by the turbo, right?
Yes, the two graphs are the stock greddy pipe and the new BEGI pipe. INTERESTING is right. The strangest part is that the AFR's are opposite of what was expected. With the stock greddy pipe, his car was running lean, and we expected it to run even more lean naturally with higher flow of the new pipe. But, it was actually running richer than before. The afr's actually looked better with the new pipe. I know people are disappointed in the results, but the state of tune of the car does not show the benefit of the new pipe. The car would push up to about 8-9 psi then drop off to 5-6 above 4000 rpm. Hense the dip in the graph. You can really feel it drop off as well. Looking at both pipes side by side there is no question that the new DG downpipe would make a HUGE difference, it's just unfortunate that the benefits are not shown in the before and after dyno. I think of it like this. If you have an old computer that has little ram and a slow processor and you upgrade one thing, it may show a little increase. But upgrade the two together and it increases big time. The change of the two together is much higher than the sum of their individual change. His car has the right upgrades and parts to make some good power. It just needs to be dialed in so that the improvements in one area are not overshadowed by another not keeping up. In this instance it's the fueling. Get the emanage dialed, crank up the boost, and have fun. Higher boost is where the benefit of a larger DP is really going to shine anyway. Also, a larger diameter higher flow cat would make a sizable difference as well in combination with the new DP I imagine.The AFR's are correct. We installed an innovative wideband in the car with the new pipe and it's readouts were pretty consistant with the tailpipe sniffer wideband on the dyno.
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Old 02-16-2007, 05:06 PM   #218
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i say slap a helper spring on the wastegate and tune the EMB a bit and you'll be looking at better results. even just turning down the Fuel Pressure a tad might help
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Old 02-16-2007, 05:51 PM   #219
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Ok if the A/F is correct, can anyone explain how it is possible? I think everyone would agree that better breathing exhaust should mean more air into the engine. More air should be leaner right?

I just don't get it.

Jay
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Old 02-16-2007, 06:02 PM   #220
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BRG said he wants to tune the emanage himself. He should be all set to do so with his new wideband O2. I agree. He has the components now. Just get the fueling and boost taken care of and it should be a fun car for sure. t

I wouldnt let the dyno sway people from purchasing the DP. That's easier said than done I realize, because I know most of you were waiting on the numbers to make a decision. It's a quality piece, with a design that has proven to make good results on other applications. I'm sure the benefits will be seen when combined with the tuning needed to get that thing going strong.
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