04-17-2020, 10:39 AM | #23 | |
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Another reason is that the caracter of the engine gets more like a normally aspirated engine. Instead of have a more diesel like caracter with a lot of torque coming early and then sign off i prefer that the car is more linear in the powerband. Now the boost increases all the way up to 7000 rpm. Another thing is that i want to be keep my car for a long time and lower torque saves the whole drivetrain in the long run. And i'm no drag racer either so i don't care if i do 0-whatever 2 tenths faster. |
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04-17-2020, 10:47 AM | #24 | |
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04-18-2020, 03:41 PM | #25 |
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I wouldn't do that... Main advantages of downpipe are flow and heat extraction. Yes, E85 runs much cooler but, still going to be trapping more heat. Heat is the enemy so get it out of the engine as fast as possible
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04-18-2020, 04:59 PM | #26 |
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I can't see that there is so much restriction. If there was a problem with that the car would react immediately to that and either lower boost or retard timing. Nothing of this happens. It would also be shown on the dyno numbers, which it doesn't as shown in the text i posted from Ptf. My log shows 22 psi at 7000 rpm. A friend of mine dynoed his M3 on E85, running 28PSI and Close to 600 whp, also with stock downpipes. His logs were perfect too, no problems at all. But it's up to everyone to do and Think what they want .
Last edited by M 4 FUN; 04-18-2020 at 05:07 PM.. |
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01-04-2024, 03:50 PM | #27 | |
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Stage 2 with stock downpipe
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01-29-2024, 09:34 AM | #29 |
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I chime in here. I run stage2 93 octane and have been doing that for three years now with stock downpipes. No problems whatsoever. Perfect on logging, no retarded timing or anything. No noticeable power loss, no bad smoke, goes through inspection as a stock car, sounds better in my opinion, no extra cost for downpipes and work.
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02-20-2024, 06:07 PM | #31 | |
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02-23-2024, 03:19 PM | #32 |
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03-01-2024, 01:59 PM | #33 | |
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Just to be clear, when you say 20% torque reduction, are you talking about boost reduction by gear? if so, did you reduce it in every gear? I have manual as well and considering stage 2 and keeping my oem cats after reading your posts. Just want to try the 20% reduction method as well. And yea if you reduced 20 in every gear? |
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03-02-2024, 12:51 PM | #34 |
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If Kies can push close to 1000hp with all four stock cats, I think it can easily handle stage 2.
https://youtu.be/wpQn9raK5vo
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03-04-2024, 11:45 AM | #35 | |
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yes, i reduced it in every gear. You can call it boost by gear but the treshold is the torque limit so the engine builds boost up to the set torque limit. Boost curve is slightly climbing up all the way to 7000 rpm to still deliver the max power output as a regular stage two map has so no peak power is lost. I really like the caracter when the engine never stops pulling on higher revs instead of signing off like a diesel . |
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04-02-2024, 08:49 AM | #37 |
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You guys definitely got me interested in running 20% reduction for a better feel and control. I’m usually on stage 2 w/ stock downpipes. Thinking about trying out the multimap and doing the 20% torque reduction through all gears if it allows me to do so on the multimap. Otherwise I’ll do it on stage 2.
Curious though, can you guys still easily do burnouts and slides when you want to with the reduction?
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04-06-2024, 04:57 AM | #38 | |
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Last edited by M 4 FUN; 04-06-2024 at 05:08 AM.. |
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04-06-2024, 06:31 AM | #39 |
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It is a recommended decision. You do not need upgraded dp (marketing hype) to run more boost (20psi vs 23psi?) it’s a marketing hype and not necessary. It’s just a boost number, if you run too much pressure through an exhaust (what?) it’ll just slow it down, not blow up your motor.
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04-11-2024, 06:43 AM | #40 |
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I throw up my dynosheet from when i had done the 20% torque reduction.
As said, EVERYTHING else is stock, the car came with full M performance options from BMW which includes M performance titanium exhaust system so that is on the car. Power is wheel horsepower. Note that torque is in Newtonmeters. Look at that beatiful torqe curve : |
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04-11-2024, 06:48 AM | #41 |
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Comparison with my friends M3 who ran catless downpipes and E30 mix and no torque reduction. I thought downpipes and E30 mix would make more difference on power but the dyno doesn't lie
Only 16 hp difference. That says a lot about how good the stock downpipes flows: |
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04-11-2024, 08:28 AM | #42 | ||
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Car feels easier to control and I have more confidence kicking out the rear on turns for fun 😄 Really liking it so far.
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04-25-2024, 07:02 PM | #44 |
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I also notice that when if I downshift and let the car roll without gassing it, it still feels like it’s on boost. Like there’s no drop off in power. I’m liking this 20% torque limit.
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