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11-02-2019, 06:25 PM | #1 |
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Stock DP ... how much HP loss?
I've modded my car with AFE Mach II exhaust, JB4, BMW intake, VRSF charge pipe. Awaiting FMIC... my question is the DP. Emissions around here bite, in Colorado. If I leave the stock DP in what type MAP would I run, I currently run MAP5, can I run MAP 2? Also what amount of HP would I loose?
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11-02-2019, 08:49 PM | #3 |
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The gain is in spool time vs hp gains.
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Ronin13543.50 elitesales305383.00 |
11-03-2019, 11:49 AM | #4 |
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I wouldn't say that.
I didn't notice any change in spool. If I dig back in logs I think they'll say similar. The gain is in the lower DC at high boost, high RPM. It saves the turbos from overspinning and destroying themselves. Most are really confused how mine have lived so long over 20PSI and half their life at 25+ (That's 100,000 miles total). It's because I've kept DC in check. With the inlets and the DP's it's been easy to make them breath and last. But it hasn't gained me any measurable better track times reliably. On the street that's a different story. It's been much quicker. Surprised quite a few. |
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11-04-2019, 10:12 AM | #6 |
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Dutycycle.
I'd say once you go beyond standard FBO it probably doesn't matter much what DP is used. You could also look into a 200cpi high flow cat for DP piping and use the same in the mid. Might be enough to pass your local emissions.
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Ronin13543.50 |
11-06-2019, 11:24 AM | #7 |
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This would be your best bet. Since you're N55, just do a high flow catted downpipe and swap the N55 midpipes for N54 midpipes (which have secondary cats) and you should be golden hopefully.
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11-09-2019, 09:12 AM | #9 |
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I passed California emissions with a Wagner catted down pipe on my n55. As the DP has gotten more miles it started to throw a CEL(40k?+). Last year I put an O2 sensor spacer On and flashed(mhd) back to stock and was able to pass. That was the first year I had to get it smog’d so we’ll see if I pass next month. Regarding power I have no idea as it was one of my first mods. Hopefully this is helpful.
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CH400EM117.50 |
11-10-2019, 10:28 AM | #10 |
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11-10-2019, 06:24 PM | #11 | |
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I know. Thing is though speed alone doesn't win. For the short run stuff, not much benefit. For the 1/2 mile or longer you'll see a big change. It's one of those situations where the person needs to build to a goal and not just haphazardly throw parts at it just because they have the money to do it. |
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11-10-2019, 06:54 PM | #12 | |
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11-13-2019, 09:52 AM | #13 |
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10 MPH in the quarter-mile is huge and there is just no way downpipes alone will do that. Other factors definitely factor into that time difference for sure. Any seasons drag racer will verify. In fact, no way. They are about a ~20WHP gain for most catless downpipes. Aside from the gain, the reduce backpressure, lower EGT's and reduce WGDC.
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11-16-2019, 12:25 PM | #14 | |
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