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12-31-2016, 09:30 AM | #23 |
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12-31-2016, 11:49 AM | #24 |
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I was looking at your build list again. I didn't see any aero listed. Is aero being considered as part of the original build?
I gutted and caged my car and started without any aero. A majority of the weight loss comes from the rear half of the car, so the car becomes very light in the rear. As a result, my car became quite tail happy....very unpleasant. (I was used to a nicely balanced car before the gutting/cage.) I started with just a rear wing to settle it, but I went with a large wing. Basically, I didn't commit to just putting on a small wing that could settle the rear. I went with a wing that would work with front aero someday. As a result, the rear was nice and settled but the car understeered a LOT on rounding bends at 80+mph. So a short time later front aero went on, and the world of car balance was once again a happy place. But you do still need to manage throttle in slow corners quite carefully because the aero doesn't do much below 50mph, so the tail happiness can still rear up in those moments. But a light M3 at speed with aero is an awesome and super stable thing. A bunch of us, including me, have wings that are simply trunk mounted. I guess it's okaaaaay----the trunk is pretty strong......but a chassis mounted wing would definitely be better. I bring this up now because a cage builder would want to consider how to tie in the wing support to the chassis and cage. Doing it correctly now would save a bunch of hassles later. Anyway, just 2 more pennies of thought. |
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12-31-2016, 12:36 PM | #25 | |
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12-31-2016, 12:44 PM | #26 |
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Dogbone - thanks for the info on the aero. I have been contemplating it. My original plan was to wait on aero and relearn the car and continue to improve my driving but I have been worried about an unsettled chassis. What did you do upfront?
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12-31-2016, 03:16 PM | #27 | |
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As far as front aero, I went with a generic carbon lip with a flat bottom and then an APR splitter under it. The splitter tip sits 5" from the front of the bumper. I also put canards up there but those are mostly for flavor. They don't do a whole lot. But they do something. And the splitter itself is a bit of its own story. You need it to be cutout to fit the underside of the M3. While I guess a shop could get a blank piece and cut it, I think that would be a lot of labor hours. Racewerkz made a cutout pattern and it's ready to go. But you can't buy that from any vendor. I suggest either contacting Racewerkz or APR. I have a build thread here in this section of the forum. It goes into great detail about my journey on my build: http://www.m3post.com/forums/showthread.php?t=1158445 I need to post in there about some of my latest thoughts about my build. |
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12-31-2016, 05:50 PM | #29 | ||
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12-31-2016, 09:14 PM | #30 | |
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I'll start by saying that I am a true believer of full aero versus just a rear wing after driving both for awhile. Only after the front aero finally went on did my times plummet by 2-5 seconds at every track. The car just came to life. Lots of front grip. I ran the car with just the 67" APR rear wing for awhile. And as I said before, it stabilized the rear end, but the front end paid the price in turns like Turn 2 and 8/9 at Big Willow and Riverside at Buttonwillow. On these turns, the steering wheel had almost no effect on the car above 90mph. I don't like it when my steering wheel is just a decoration.... While the rear wing was the only aero, I was at Big Willow, and the rear felt great but the front was suffering so I took 1º Angle of Attack out of the wing to see if I could rebalance the car. That 1º was VERY noticeable in Turn 8 in a bad way. The rear felt nervous again. I did get a little front control back, but the rear of the car felt crappy. I only have 1º increments, so there was no in-between setting to try... So, the answer for me seemed to be that if I only had a rear wing and wanted the rear to the car to feel good, the front would suffer on high speed rounders. I was able to dial out the rear wing enough that it wasn't doing as much anymore and the car felt bad altogether. So, the question is, could a smaller wing do a better job without front aero? I don't know.....I dialed out enough angle that the wing wasn't very effective and the whole car felt crappy. The main reason I didn't do full aero right from the beginning was because I was afraid of breaking the splitter every time I went off track. But I can happily tell you that it has survived at least 10 off-track excursions---including sliding off at Turn 2 at Laguna Seca into the gravel (and needing to be towed out because I was stuck), and it's survived several offs at Buttonwillow in the mud (with mud showing on top of the splitter), and one off to the left side after Phil Hill (yuck). I know it could still break, but it sure has held up quite well. So, my main fear of front aero turned out to be misplaced. Here's the thing---No rear wing big or small can help prevent air going under a car in the front. If anything, it raises the front of the car up. Front aero is the main thing that can encourage the air to go over the car. My final conclusion once I drove full aero was the aero works much better when it's on both ends of the car, and that going only halfway was not a proper solution. Last edited by dogbone; 01-01-2017 at 12:16 AM.. |
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12-31-2016, 10:45 PM | #31 |
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i was just thinking the other day that i should have started a little notebook journal when i started tracking just to keep tabs on different mods and how they felt/etc.. i think i'm going to actually start doing this once i install the aero bits i have collected (apr splitter, gts style wing). mostly because adding aero to my evolving car is going to be quite the game of trial and error. i'm not sure yet, but i would imagine that some settings will be good for one track, but other settings will be better for another track. some settings might also be a definite "no", and i don't want to revisit those settings twice in the exploration process.
all that said, i'm enjoying reading your guy's experiences and discussion.
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01-01-2017, 09:59 AM | #32 | |
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01-01-2017, 12:13 PM | #33 | ||
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01-01-2017, 03:37 PM | #34 |
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Me and a couple other friends on here have been doing go-to meeting type of conference calls and comparing our data. The conversations are funny as hell. We're thinking of posting an online version. Lol
I only have very mild rear aero - a high kick spoiler. Lol. Seems to be working for me and the front splitter (although not as large as you guys)
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01-01-2017, 05:18 PM | #35 | ||
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01-03-2017, 08:31 PM | #36 |
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The rod bearings were replaced today by Greg Smith. Greg seems very knowledgable so glad to have him doing the motor work. He is also replacing the valve cover gaskets since the motor is out. I am not an expert on the rod bearing issue but he felt they did not look too bad. The car has a little over 50,000 miles.
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01-04-2017, 06:49 PM | #38 | |||
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01-11-2017, 08:19 PM | #44 |
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