06-12-2014, 12:55 PM | #1 |
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Autocross - Anyone running an F30 in FS?
Curious on any 335i or 328i's that have been run. Especially with DHP. Curious if an autocross alignment and good tires makes them fun if not competitive. Don't plan to autox mine this year other than maybe a fun run later in the season. But could play with it some in future years when I'm not racing something else.
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06-13-2014, 07:22 AM | #3 | |
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In relation to my older E90 at the autocross the F30 has a longer wheelbase and is a tad wider. I'm still trying to get the "new" car dialed in. Dialing in a bit more front end grip at 2.5 degrees of front camber helps but I don't think that much camber is allowed in a stock class. Up to 2.00 degrees camber is allowed in one of the clubs I run with and still considered stock, SCCA is likely different (which I think a few others may speak too). I would be interested to hear some feedback from those who have had good success with the F3X platform at the autocross in stock or modified classes and which changes or modifications some can see as being or not being advantageous. I can say any more power than MPPK will not be advantageous unless your running an LSD with R-comps but more preferably slicks (and by then you might be "outclassed")
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06-13-2014, 02:15 PM | #4 |
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I think with the lsd being a port install option starting may 8th that it should be legal. Word on the shockware is no currently, but some consideration being given to ECU flashes that do not affect the engine. The shocks may be on their own ECU which may also help.
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06-13-2014, 09:46 PM | #5 | |
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Come to think of it, pretty much everything I've done to my car could still be within the realm of "stock"... I've got OEM camber bearings, M Performance PPK, exhaust, LSD, splitter/diffuser, and then shockware tuning. The only aftermarket performance parts are springs and wheels - both of which are ok in stock class, right?
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06-14-2014, 06:46 AM | #6 |
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Springs aren't okay in stock. Camber bearings are also questionable. The rules more or less are written that if it is not explicitly stated to be legal than it is not. So since shock reprogramming is not specifically listed it is also questionable in SCCA. That said, at the local level it is usually not an issue.
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06-14-2014, 07:37 AM | #7 |
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Bummer about springs, but I guess that makes sense. OEM camber bearing should definitely be ok though - these are BMW parts intended to be used if there are issues getting the car aligned (e.g. after an accident)
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06-14-2014, 08:53 AM | #8 | |
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07-24-2014, 01:37 PM | #9 | ||
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For SCCA Solo Stock the camber bearings should be allowed
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The Dinan springs aren't legal, but the MPerf port installed springs are, as are all other MPerf parts including the LSD Quote:
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07-24-2014, 03:27 PM | #10 |
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Port installed options are only allowed if you can also have it installed on the factory production line. In the case of the LSD I don't think that's a factory option, only port option and therefor not allowed.
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07-25-2014, 09:49 AM | #11 | ||
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07-25-2014, 01:32 PM | #12 |
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I have Shockware on a 328d. How do you think that car would do in autoX? Is the diesel an advantage or a disadvantage? I would guess it's the former.
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07-28-2014, 09:26 AM | #13 |
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I discussed this with a few guys in my region that are pretty good with the rules at the National level, and they all felt that given the release letter for the LSD in may that it qualifies as legal due to the port option for it.
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09-27-2014, 11:10 PM | #14 | |
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I was surprised and disappointed to experience as much understeer as I did. I hope to improve the car's performance (and decrease understeer) for next season by having the H&R RSB installed. At that point it probably would make sense to upgrade to the PSS to match my upgraded suspension. Can't wait!
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09-28-2014, 01:50 AM | #15 | |
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09-28-2014, 07:39 AM | #16 | |
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BTW, I'm also going to be getting a piggyback module (from Steinbauer Performance) to take hp 180>217 and lb-ft 280>332. That should help!
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09-28-2014, 10:33 AM | #17 | |
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Understeer is by design in the car. Putting a rear bar on it will not correct it all that much in most cases. What you need to do is get as much rubber on the front as you can (try to square up to whatever you have in the rear, even if you are a staggered wheel setup). Then have the alignment modified to maximize camber on the fronts and go zero toe, to a slight toe out. That will help significantly. On the RWD cars we put on a FRONT bar actually. Helps get more power down on corner exit. Tire pressures and the alignment information I gave you is how we dial out the understeer. If you overdrive you'll still get plenty of push, but the car will approach good neutral attitude on anything but a tight hairpin with the right adjustments and alignment. Hope that helps and enjoy!
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09-28-2014, 10:35 AM | #18 |
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I didn't realize the springs were a port option.. that's got some awesome potential then!
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09-28-2014, 10:14 PM | #19 | |
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So you're recommending foursquare setup (which I have), better tires, negative front camber (0.5 degrees), and a fsb. Not sure what information regarding tire pressure you're referring to. The fsb recommendation comes as a surprise to me. Do others agree?
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09-28-2014, 10:58 PM | #20 |
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When I did my sway bars, I did the rear a week before adding the front. The car had a very clear bias toward rotating around a corner with less steering input in this configuration. It's a different feeling than adding more front end grip (e.g. with camber plates) but the result was clear. FSBs flatten out the front end, which among other things reduces weight transfer to the outside front tire... which typically results in more understeer, not less.
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09-28-2014, 11:51 PM | #21 | |
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09-29-2014, 07:41 AM | #22 | |
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It's not always about maximizing the perceived cornering behavior, but best weight transfer attributes etc. I've raced E36's and E90's for the last 6 years, so I'm working from that experience. ALL of the BMW guys run front bars. You have to remember that whatever end you put the sway bar on picks up more weight transfer, which you rightly assumed, however, it also stiffens the roll rate on that end as well. Adding a front bar actually REDUCES camber loss at the front end, which increases front grip. If you don't make toe and camber changes at the same time you won't receive most of the benefit. Additionally, the increased stiffness at the front prevents over loading of the rear outside tire, and the reduced (relative) rear sway bar stiffness allows the inside rear tire to maintain more contact during acceleration and stabilizes corner exit power delivery. By then modifying rear toe slightly you are able to generate the rotation you need, improve rear grip under cornering as well, and increase the overall performance of the car. It is a delicate balance though, you can't just throw the biggest stiffest thing you can at the front and "succeed". Most of the cars do take a pretty beefy bar, but adjustable bars really help to dial in the correct balance. I don't think the F30 has much different on the front geometry to really change what has been the standard from the E36, E46, and E90.
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