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Messages - Jackal
91
« on: September 29, 2016, 12:06:58 PM »
As I interpret the rules, spacers are allowed and counted as part of the wheel to ensure stock offset.
I'd love to go to studs though for ease of wheel changes. I know longer bolts are allowed to allow spacers, but a stud conversion is not a Street allowable mod.
May I just add... get with the times German cars!! Use studs. Wheel bolts are a pain... especially with spacers!!
92
« on: September 29, 2016, 11:43:10 AM »
Certainly good food for thought there Reijo. In my case though, I'll be looking to step down to 18's from the 19's that are on there currently. I like a little more sidewall and feedback from the tires.
I'm looking at a set that are lighter than what's on there currently, stock widths ( I was looking for an extra .5 inch width, but they aren't available in that size), and only a few mm difference in offset.
93
« on: September 29, 2016, 11:25:58 AM »
Firstly, thanks everyone for the help. Damn fine community we have here.  SM - sedans/4-seaters.
SSM - 2-seaters ...
And, yes, some cars do not have a place in Street Touring, although the Z (corrected) is allowed in STR ....and let's not forget BSP,
R
That all makes sense. I don't have a hope in hell of competeing in SSM on my budget. Lol I think I'll avoid that class. Brakes are one of the first things on my list. The braking was a bit weak these last couple events.
The braking issue was most likely your rubber. Get better tires and you might be amazed at how good your brakes are working. I run a ceramic pad for cold performance (first run) and sharper initial bite than the OEM, but there isn't any more maximum braking available compared to the OEM pads. I run OEM brake fluid, and have yet to experience any fade or softness at autox, even with two drivers.
My current list to stay in class, likely in order of appearance;
New tires and wheels
New brake pads and fluid
Alignment
Cat back exhaust (resonator delete)
Front sway bar
I would argue that your best path would be this order:
Tires + alignment (this will be your biggest gain)
Brake pads
Sway bar
Adjustable shocks (to help with some of the handling issues usually caused by the sway bar)
Wheels (mostly for diameter change if it is helpful for your car) (don't forget about the rules WRT wheel size and offset)
Exhaust
Be careful with the exhaust change; you may end up with a car that is mostly undriveable on the street. Or one that exceeds the sound limits. And it will probably give you the least improvement of the entire suite of changes.
I plan on 18's for next season, which were an option for the Z4M. The tires will have to wait until then as well. I should have actually placed the tires and wheels last on the list I posted before. My bad. Unlimited budget and the wheel tire upgrade would already be done. Quick clarification. As I understand it, converting to studs is not allowed, but longer bolts are if required to compensate to stock offset. Is that correct? I wanted to take care of the little things before then though brakes, alignment, exhaust for a few extra HP, and the sway.
94
« on: September 29, 2016, 08:30:24 AM »
Just thinking about the SM comments, I think the Z4M would fall into SSM. What's better than being in a Super class?
So it's omitted from Touring and Street Modified. Geeze!!
95
« on: September 29, 2016, 08:28:58 AM »
A good set of brake pads can really help as well. I'm not sure what the best pads for a Z4M are but carbotech or hawk hp plus pads seem to be the most popular in autocross on other cars. They cause a lot of heat so having a high temp brake fluid will help keep your brake pedal firm and consistent as well. It never hurts to search for other forums on the internet to find out how guys are setting these cars up south of the border. There is a good chance that someone has already done the homework for this car and has a good base line set up to begin with.
Brakes are one of the first things on my list. The braking was a bit weak these last couple events. There is so much info available on these cars it's tough to sort through it all really. My current list to stay in class, likely in order of appearance; New tires and wheels New brake pads and fluid Alignment Cat back exhaust (resonator delete) Front sway bar
96
« on: September 28, 2016, 05:18:55 PM »
My 2 cents worth would be, keep it stock and fix the nut behind the wheel. RE71 R, sway bar and a set of konis will transform the car and still run in BS
The flabby bit behind the wheel is always the biggest factor. I'm sure if I gave the car to Ryan, Cam... or any others on that side of the leaderboard, I'd see very different results.
97
« on: September 28, 2016, 03:26:28 PM »
As I've learned after the fact like many before me...Street prepared/Street Mod are the cut your fender for stupid wide tires class that tricks people into thinking it is the add power to my car class. It takes a very high level of car preparedness to hope to pax well in those and higher classes.
Tires first, then power unless your going to ignore pax like me and then I'd say add all the power you can and have fun!
I've made that mistake before on the 135 and ended up in STU for wheels only. I've done alright in SM with a Subaru way back when as well, but that one I just blindly wandered into a class without thought. My goal with this car will be gradual mods and likely an eventual settling in SM, by way of BS and BSP. Next year I'd like to compete in BS and put at least a full year to that class.
98
« on: September 28, 2016, 01:42:52 PM »
Eventually I'll be building her for BSP, where I can have the aero, pully's, headers.....
BSP does not allow wings, just spoilers without endplates. To get a wing, you need to move up to SM.
Hmmm SM does give me a reason to get that supercharger I've been pining for.
99
« on: September 28, 2016, 01:41:24 PM »
The performance gain would be negligible for autox, So I would just run it closed for events which should definitely be legal and enjoy it open the rest of the time. I thought S2000 guys used to just disconnect their catbacks all together.
To meet rules, you need at least a straight pipe to guide the bypassed exhaust to one of the original openings. And you will certainly need a muffler on this straight pipe to meet sound.
BTW, it is illegal (and extremely unsafe) in any class to have exhaust released underneath the car. You wouldn't pass tech if you tried that.
Deuce! and Double Deuce!! Time to erase that idea and start coming up with others.
100
« on: September 28, 2016, 01:15:04 PM »
The performance gain would be negligible for autox, So I would just run it closed for events which should definitely be legal and enjoy it open the rest of the time. I thought S2000 guys used to just disconnect their catbacks all together.
There's not a lot I can do to squeeze more power out of the car. In BS I can't use underdrive pully's, or replace headers. The exhaust mod is about the only power adding mod allowed. I always say build the car you want to drive every day, and worry about the RAW scores if that matters to you. Unless you're holding the top of your class or top times of the day, it just doesn't make sense to try mods that conform to the rules IMO.
Eventually I'll be building her for BSP, where I can have the aero, pully's, headers.....
101
« on: September 28, 2016, 11:35:54 AM »
I'd say no to exhaust modifications you're looking at. You have to run the tailpipe to one of the holes in the rear bumper after the cat anyway. Or are you thinking muffler on one side outlet and muffler-less on the other side? I think the added weight and complication wouldn't be worth it and even that might be a no no.
The rules are basically saying you can replace the "cat-back" portion of system all you want and can goto a single outlet if original was a dual outlet.
I don't think anyone would protest having the uprights left for the wing but if trophy anything can be picked apart that isn't OEM.
Basically my idea would be to have the stock exhaust fully intact, but right at the X pipe (well after the CAT), run two exhaust cutouts that allow the exhaust to bypass completely the stock hardware. My confusion was generated from the ability to "remove" any component. With a cutout half engaged, half the exhaust has the potential to exit from the stock location.
102
« on: September 28, 2016, 11:19:03 AM »
My Second question is a bit funny.
I love the look of the Z4M with a GT style wing on the back of it. Staying within BS won't allow it. However, if I were to remove the actual wing itself but leave the uprights on the car, would that still qualify as a BS car?
103
« on: September 28, 2016, 11:15:25 AM »
I'll start.
I have the 2006 Z4MC and I would like to remain in BS as this particular M car is omitted from Touring classes and skips straight to Prepared.
MY question is in regards to Exhaust bypass cutouts. As per the rules for Street Class Exhausts....
"Any part of the exhaust system beyond (downstream from) the last catalytic
converter, if so equipped, may be substituted or removed provided the
system exits the car in the original location and meets the requirements of
Section 3.3.3.B.16, Section 3.5 and Appendix I where applicable. Vehicles
equipped with exhausts that exit in multiple locations may change to a single
outlet in any of the original locations. Stainless steel heat exchangers
are permitted only if the physical dimensions and configuration remain
unchanged."
Realizing that the cutouts will have their own challenges with sound limitations, does this rule look like cutouts may be a legal modification? I like the idea of getting the power from the bypass, and if I have a variable switch for it, I should be able to ensure I'm under the sound limits as well. I just want to be sure I'm within the letter of the law.
104
« on: September 28, 2016, 11:02:36 AM »
Hi All,
I'm starting this thread for interpretation of the Street Class rules. Although limited, there may be some questions about what may or may not be permitted.
Hopefully this thread can be collectively used for folks to prepare their cars effectively for the Street class only. No Touring, Prepared, Modified chat here please.
105
« on: September 28, 2016, 10:50:40 AM »
Is there a way we can link to a classing guideline in the registration page? I'm sure it wouldn't fix all the classing errors at registration, but it may alleviate a few.
Even if at the drop down (Class Selection) menu it has a *Follow Link for Classing info* or something.
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