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02-05-2016, 08:01 PM | #46 |
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02-05-2016, 10:03 PM | #47 | |
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For reference, my STR car, which was absolutely perfect on balance, ran suspension frequencies (no rear bar, big front bar, I hate rear bars for a number of reasons) of 2.14hz front, 2.37rear. Way better way to compare setups between cars than rates, because they include the actual corner weights of the car. At STX weights, here are the ride frequencies of different spring rates on the car. Keeping a .2 or so split between front and rear is ideal for a number of reasons that are beyond the scope of this thread, but I'll debate putting a blog together on it. For what it's worth, I actually like soft cars a lot in roll, which I believe my car is. 300 1.99 350 2.15 400 2.3 450 2.44 Rear 700 1.92 750 1.98 800 2.05 850 2.11 900 2.17 950 2.23 1000 2.29 1100 2.4 1200 2.51 I've talked at length to a couple GA teams who have run N52 cars. They disagree heavily with what homeboy above has posted. As an aside, I don't care about low-end torque too much (and I doubt Kyle does either). A histogram plot of National Solo course speeds will show that, after the initial first gear shift, 90% of the run occurs at speeds above 3500RPM (33MPH in a 128 running 255/40/R17 RE71Rs, with a 25in diameter (unshaved). The vast majority happens between 40MPH-50MPH, with bursts above. In a sense, I really only care about the 4000RPM+ powerband. Not a lot below that. In addition, in the speeds sub-40, you're usually combining your acceleration on exit with lateral use of the tire, so you're traction limited, not power limited. Sadly, I can't find the thread you're referencing. I did, however come across some interesting posts where you were debating running an intentionally illegal car in STX, and told Kyle that 200lbs was irrelevant in Solo Performance (for reference, 200lbs will affect a thrust curve more than even 10whp will), and one asking for help installing an intake. |
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02-05-2016, 10:34 PM | #48 | ||
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But hey, you know more than me because you read a thread where I asked how to remove my bumper, hack my airbox to install the Dinan intake, and run my STX* car in a PRIVATE autocross club where the rules don't matter. But you're right, 200lbs would have a greater effect on acceration, and it's so obvious that I never asked for an opinion on the matter. But have fun trying to reinvent the wheel and failing at it. Last edited by Taskmaster; 02-06-2016 at 11:41 AM.. |
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02-05-2016, 10:58 PM | #49 |
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Who was your tuner? Out of curiosity. None of the common tuners have a 3in pipe base map available, so just curious if there's anyone doing fully custom dyno tunes other than Epic.
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02-05-2016, 11:15 PM | #50 | |
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For eveyone else reading this thread, please don't follow in OP's footsteps. Placing the collector too close to the manifold like he proposes will cause the exhaust gasses to back up into the combustion chamber at lower rpm when scavaging and exhaust gas speeds are lower. It's called exhaust reversion, and race teams don't care much about it considering they don't spend any time on the street.
Just to be sure, I'll post a few examples: http://www.r3vlimited.com/board/showthread.php?t=317505 Exhaust from run 3 notice the x-pipe is closer to the engine Run 3 to run 4 was a cam timing change (advanced 8 degrees). i did a cam belt change at the same time and thought maybe the timing shifted a few degrees. while i found good gains the shape of the torque curves shows that this was not the problem. the real problem is the relocation of the x-pipe Quote:
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02-06-2016, 10:58 AM | #51 |
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Bringing this back on topic, last night made some additional progress:
Got the Brides in the car, on Sparco bases. Haven't made sure the seat belt receptacles are plugged in correctly yet, and will need to get the airbag light coded out, but that should happen this week. These are the best-fitting aftermarket seats I've had in any car. I've got a small waist (32/32 jeans are a little loose on me), but big quads, and they fit great. Hold me in very, very well, along with the codriver, so we're good. Lots of shoulder clearance, too. Also test fitted my 17x9 rear with 255 RE71R. It's at the limit of what one could do with stock camber (unadjusted) and no roll. Lots of inner clearance. Would definitely go with a 55 if I were going to switch to the 265s (which is likely by the end of the year). |
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02-07-2016, 11:01 AM | #52 |
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STX RX8, STX BRZ, STX 328 based on full-prep dynos. STX 128 dyno based on an 80% prep dyno (likely between 8-10ft/lbs down across the board, maybe more..) |
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02-08-2016, 09:54 AM | #53 | |
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02-12-2016, 08:18 AM | #55 | |
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Garage List F15 X5 xDrive35i [8.75]
E86 Z4 M [10.00] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.50] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [9.08] |
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For example the Bimmerworld 3" race exhaust for the s54 places the merge right by the headers. This is marketed towards race cars where you're doing most of your driving in the higher rev range. Rogue's Diablo exhaust however places the merge after section 1 as to not sacrifice the torque and would be better suited for street or dual duty cars. End of day, just make sure you go mandrel with least number of sharp bends as possible and exit with a high flowing muffler. |
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02-12-2016, 08:26 AM | #56 | ||
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02-12-2016, 08:58 AM | #57 |
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Yeah, the lack of concern about low-end power is precisely why I posted the information that I did.
I can probably count the number of times I've been full-throttle below 30mph (save for ProSolo) on one hand, in maybe 3 years, and none of them happened at events where the result was very important (usually on local lots with very tight turnarounds and the like). Kyle, do you have SoloStorm histogram plots for speed for Nationals / Pro Finale 2015? That'd be useful data for this conversation. I don't on hand (cleared out a majority of my STR S2000 logs). Make sure you trim start/stop points so you don't have the low-end filled up with the coast post-finish, etc. |
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02-12-2016, 09:28 AM | #58 | |
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Garage List F15 X5 xDrive35i [8.75]
E86 Z4 M [10.00] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.50] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [9.08] |
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Agree on your comment re SS design. I think the SS exhaust is marketed more towards the masses. Before I realized this, I thought best practice was to copy BW and Vorshlag's design. Again, different design for different goals/purpose. I'm actually in the process of tweaking my exhaust. I need to raise it a bit but while I'm at it I'm considering moving the Burns Y collector a little further back and slapping on a high flow cat. Last edited by 3002 tii; 02-12-2016 at 08:53 PM.. |
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02-12-2016, 09:31 AM | #59 | ||
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I really want to see what you eventually put down, I bet it rips! |
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02-12-2016, 10:08 AM | #60 | |
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I still have the logs so that won't be an issue. Expect them tonight or tomorrow. |
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02-12-2016, 09:01 PM | #62 |
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Garage List F15 X5 xDrive35i [8.75]
E86 Z4 M [10.00] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.50] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [9.08] |
Probably not that high since I'll be slapping a race cat on. Back on topic, sorry OP!
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02-14-2016, 05:41 PM | #63 |
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Okay, finally got some big stuff done today.
AKG Front Endlinks, JRZs + Camber plates on. Front ride height set, rear needs to come down a bit after the fenders are rolled (which is why my front wheels are stockies now, too. Frustratingly, the front adjusters don't fit exactly right when the plates are being used at max camber, so I'll likely be just using an 8mm wrench. No prob! The car rides STOCK with front shocks at 5/12 compression, 12/22 rebound, and rear 5/12 compression, 9/22 rebound. Silly amazing really. Pumped all the dampers up to 220psi, as well. Fenders rolled tomorrow, and the christmas-lights on the dash being disabled, along with all the brake coding and e-diff crap, in preparation for the diff + AKG bushings going in on Wednesday, along with an alignment. First event will be a test-and-tune next weekend in Danville, VA. Not expecting much with the car this far overweight and down on power, but it'll be good to see where it sits. I also realized I need to re-install my front sway bar, as it is *very* bound up with the bushings Eibach provides, so going to sand those down so they aren't so compressed by the bracket. |
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02-15-2016, 09:35 AM | #64 |
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Drove on RE71Rs in a couple inches of snow this morning to the shop that's rolling my fenders and performing some of the coding for me. Not nearly as bad as I was expecting. |
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02-16-2016, 02:54 PM | #66 |
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Don't think I'll be getting 265s on the front . Have to lower the rear a bit before alignment, but that'll be easier to do on a lift tomorrow when the diff + bushings go in. Car finally looks decent though, but man is it in need of a detail. |
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