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BMW 3-Series (E90 E92) Forum
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Took my car to the dragstrip tonight...
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03-04-2018, 08:44 AM | #23 | |
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The way I’ve been testing this week is doing pulls on the road from 60-90 in 3rd gear which takes about 6 seconds and runs from about 5000rpms to 7400rpms. There’s no shifts in these pulls so “Driver Mods” are not necessary for accuracy lol. Also that’s the range I’m looking for improvement in. I’ve compared 6 of these pulls against a baseline I did the day before the throttle body swap and I’m seeing a difference around .2 seconds improvement on average in the time through 5500 to 7500 revs. We are talking about a mod that would add maybe 3-5hp on the revs from 6500-7500 so only a small portion of the range I’m testing. What I’ve also noticed is the time from 4000 to 5000 revs is actually slower taking about the same amount (.2) longer. So it just seems to have shifted some power to a different part of the rev range. I feel that’s an improvement for what I’m looking for. I only pass through 1000 to 5000 rpms once on a pull, and in first gear when I have the best leverage and pass through the fastest. Then every shift after that keeps me above 5000 where the power increase is and I’m spending a lot more time in each successive gear in that higher power band. But like I said I want to do more testing with a more accurate timer. The Dragy timer I ordered will give exact times though every 10mph speed. So I can see the exact effects mods have where it counts, speed on the road. I’m throwing this out for discussion... I feel this is better than dyno testing cause speed on the road is what counts for me, air flow through my intakes and exhaust isn’t the same on a dyno and we dyno to check power in the hopes of speed. But I’m measuring speed directly this way as long as I can correct to standard conditions. Which I can do drag times posts the density altitude data for that track I was on that’s nearby so I can get density altitude data and correct. Last edited by Biginboca; 03-04-2018 at 09:07 AM.. |
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03-04-2018, 08:56 AM | #24 | |
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BTW. I'm not a dragster but consider myself a decent driver having karting experience and riding sportbikes for over a decade. 14.5-14.7 is nothing to brag about. |
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03-04-2018, 09:02 AM | #25 | |
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I observe that you won’t admit you are incorrect in your statement 328i Auto’s run 14.5 which you said they do. That was my only point was correcting an error you made, but I don’t want to muddy this thead with that stuff any more I’m more interested in discussing mods and improving the cars we love! |
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03-04-2018, 09:08 AM | #26 |
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Glad to see you are having fun with your car, better yet Legal fun.
I put a crap load of miles on me N52 powered car and the engine was a dream, I really liked the throttle response and broad power band, with a good tranny tune it was simply a joy to drive. In some respects it was more fun than my N54. What are your goals here? learning to drive quicker is HUGE but are you looking to win races in a class or build a speed demon? Last time I checked a 3 liter NA motor pulling a 3,500 lbs car is never going to be a speed demon. Win races it could. It's been a very long time since I've been at a track and the rules have probably changed 100 times since then, but constancy used to win races. No point in breaking out a 13.5 sec quarter when you were set to run 14.0s. Looking at your mods, there is little you can do with the car to make it substantially quicker, I did a quick check on the NHRA rules for drag racing and changing the intake manifold pushes you into Super Stock. Like a mentioned, it been a billion years since I've done any of this and maybe they turn a blind eye to BMW manifold swaps. Do you have any tracks in your area that have turns in them? Straight lines get boring really quick. |
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03-04-2018, 09:18 AM | #27 |
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I'm going to have to disagree here as well. The auto 328s put down less than 200whp (typically 175-185). Thats 40+whp less than my 330i did stock. And the 330i was putting down 14.3-14.5 1/4's by professionals when it came out (on heavy run flats even)- those numbers don't add up..
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03-04-2018, 09:20 AM | #28 | ||
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03-04-2018, 09:20 AM | #29 | |
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I have also autocross this e92 and will be doing so again soon I agree the road course and Autocross is a lot of fun. So the point is just tinkering and problem solving. Trying to make the car better and doing things differently. I guess there really is no point. One goal I have had in mind was trying to see if I could make this at close or equal to a stock E46M3 in performance parameters. Like a personal challenge. I always liked that car but the looks and comfort of the E92 won out so making the E92 an equivalent to one of the best cars of all time, E46M3 is a challenge I gave myself. One of the performance parameters I’m looking to beat is reliability and maintenance costs btw. So I’m not willing to compromise reliability or comfort to get there. Once I feel this car is as close to a stock E46M3 as I can get I’ll probably start tinkering with something else! Edit: just FYI E46M3 on average Joe driving are like 13.6 @ 103 more or less so that would be a goal here to get close to that. I still feel I can get to 13.8! Last edited by Biginboca; 03-04-2018 at 09:38 AM.. |
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03-04-2018, 12:43 PM | #30 |
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03-04-2018, 06:45 PM | #32 |
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What did you replace the PE with once you got the headers?
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03-04-2018, 07:41 PM | #34 |
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With AA headers and all stock exhaust I’m debating between doing a secondary cat delete or keeping secondary cats and getting a muffler to replace my stock muffler. I feel that doing both would be too loud seems like you would agree?
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03-05-2018, 05:54 AM | #36 |
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How cold or hot was it outside when you did your run? I live in california where or temperature ranges from high 30’s to low 110s...
I think that no matter what mods we do to the car, they’ll be minimal in comparison to the effect temperature has on our cars On a super hot summer day my car will feel Incredibly slow, and on a cold winter night my car feels so much quicker especially on 0-60 I’ll even lose traction sometimes off the line |
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03-05-2018, 07:52 AM | #37 | |
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03-05-2018, 09:41 AM | #38 |
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According to google my cities elevation is 700 ft above sea level🤔 but my car really pulls when its low 50’s or 40’s Fahrenheit
Wonder what the 1/4 would be under the ideal conditions |
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03-05-2018, 04:32 PM | #39 | |
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Now it's not clear whether they ran a manual or automatic but needless to say 1/4 mile is generally the same. Many sources confirm 14.7 for stock. Autos catch up to manuals thanks to lower gear ratios. Now about my e92. Always drive in sport manual mode and fill top tier gas 93 octane. Tranny works flawless and stays in gear. Car performs better in cooler weather. Only mod is K & N filter and decent old school tires. I running my car will do better than most so called pros as you like to refer to them cause my car's adaptations in full-time sport manual, top maintenance and feel yield faster results than journalist with a borrowed car. And no, I do not see a need for any corrections on my side. Worth noting, many enthusiasts here got their cars with 100k miles or more and have no clue what their cars have been thru. Nothing wrong with that except for assuming that their car is the base for measurments and spreading rumors how slow the base car is running on 4 cylinders lol. 2013 base (light) e92 owner. http://www.autorooster.com/0-60-times/bmw/3-series/ |
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03-05-2018, 05:08 PM | #40 |
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I mean, a high 14 second pass is possible - I trapped at 93mph, which is a better indicator of power than ET.
But I've never seen it done, and it's likely easier with a 330i because of the low end torque advantage. |
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03-05-2018, 05:08 PM | #41 |
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Seriously you are still beating that horse? It’s clear it was a Manual because it says 14.7 for the quarter mile. Which is what MT and some users on this forum also got for a stock Manual.
Are you even reading the comments others have posted in this thread in regards to your error? Do you also hunt windmills in your spare time? |
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03-05-2018, 05:22 PM | #42 | |
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You just need to get a working intake tube.... |
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03-05-2018, 05:58 PM | #43 |
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N55 you mean? N54 isn't valvetronic.
I thought BPC was testing it but I haven't seen anything yet. |
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03-05-2018, 06:06 PM | #44 |
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