"Is bigger better?" Stoptech 380 vs. Stoptech 355 - Page 4

ortho281 · 02-12-2013, 10:36 PM

Quote:

Originally Posted by 1MOREMOD

just made my car less practical for the street again. extended my 3 inch apex ducts to the rotor but lost bunch of turning radius. who needs to make u turns anyways.

I do, and my power steering pump whines everytime I do.

ortho281 · 02-12-2013, 10:55 PM

Quote:

Originally Posted by Superfly_M3

200lbs for two front seats??? I don't know about that one. Are they really that heavy? If you will be replacing with something like Recaro PP or CS then the weight would be added back no?

I meant approx 200 lbs total, (he already said the seats were 63 lbs each) including the stripping (82 lbs) he has already done.

Quote:

Originally Posted by 1MOREMOD

front seats are 63 each. recaro profi is 14lbs, or kevlar for 8-9 but mounts add to that. possibly save 40lbs a side.

So approx 160 lbs with a pair of Recaro and shedding the back seats etc. That's some pretty good weight savings.

1MOREMOD · 02-13-2013, 12:07 AM

yeah thats about right. can go nuts also and really strip the interior of all sound deadening, door panels, speakers, and end up down over 200.

ortho281 · 02-13-2013, 11:19 AM

Quote:

Originally Posted by 1MOREMOD

yeah thats about right. can go nuts also and really strip the interior of all sound deadening, door panels, speakers, and end up down over 200.

That's cool! Looking forward to seeing some pics when you are done!

1MOREMOD · 02-13-2013, 11:46 PM

Quote:

Originally Posted by ortho281

That's cool! Looking forward to seeing some pics when you are done!

hey dont help. im not doing full on race version of my car yet. when i cant go any faster and exhausted other options then maybe i will develop it into a stripper.

Bx Tpr · 03-06-2013, 08:35 PM

had st40's installed on my old e90 M. beat the snot out of them 3x at watkins and 2x at limerock. Not much but I also drove the car daily and was able to go from summer to winter to track wheels without worrying about fitment issues around the calipers. also used the same pads all year and never an issue with the castrol srf fluid. amazing product for the price.

good luck

ortho281 · 03-06-2013, 10:54 PM

Quote:

Originally Posted by Bx Tpr

had st40's installed on my old e90 M. beat the snot out of them 3x at watkins and 2x at limerock. Not much but I also drove the car daily and was able to go from summer to winter to track wheels without worrying about fitment issues around the calipers. also used the same pads all year and never an issue with the castrol srf fluid. amazing product for the price.

good luck

Thanks! I should receive them in a couple of weeks. Looking forward to using them on the track.

jacobe92 · 03-13-2013, 05:54 PM

I had a chance to switch my Brembo 380mm front and rear to 365mm front 345mm rear. I decided to change it for better 18' wheel clearances.

MRM55 · 03-17-2013, 10:23 PM

Quote:

Originally Posted by jacobe92

I had a chance to switch my Brembo 380mm front and rear to 365mm front 345mm rear. I decided to change it for better 18' wheel clearances.

what results did you see? any major differences in braking performance?

jacobe92 · 03-18-2013, 04:46 AM

Quote:

Originally Posted by jacobe92

I had a chance to switch my Brembo 380mm front and rear to 365mm front 345mm rear. I decided to change it for better 18' wheel clearances.

Both brake sets feel the same to me.

ortho281 · 03-18-2013, 09:29 AM

Quote:

Originally Posted by jacobe92

Both brake sets feel the same to me.

I think the only difference, may be that the 380/380 will have better heat dissapation and heavier upsprung weight over the smaller 365/345 set up.

r53s65e90 · 03-18-2013, 05:37 PM

Quote:

Originally Posted by ortho281

I think the only difference, may be that the 380/380 will have better heat dissapation and heavier upsprung weight over the smaller 365/345 set up.

I went through the same thought process about this before deciding on the 365 kit. 380 has definitely more heat capacity but what does this mean? My calculations were as follows: Based on geometry the 365 rotor is about 4.6% lighter. Given that all other stuff is the same (slotted, same caliper, same pads, same cooling effectiveness) and assuming all kinetic energy goes into heat to the front brake (which is the absolute worst case) here is what it means: If you fade (=boil fluid) the 365 kit during braking from 110mph to 40 mph, the 380 kit will fade from 112mph to 40 mph. To me this means NO perceptible difference, especially if you factor in cooling and the fact that part of the heat will go tot he back brakes. So I get to keep my 2 sets of stock 18s too.

I didn't bother with rear brakes calculations as I consider them a cosmetic mod.

I couldn't make the same calculations with the stoptech setup because caliper and pads change from the 380 to the 355 kit.

Would be nice if someone could replicate my findings.

ortho281 · 03-18-2013, 06:02 PM

Quote:

Originally Posted by r53s65e90

I went through the same thought process about this before deciding on the 365 kit. 380 has definitely more heat capacity but what does this mean? My calculations were as follows: Based on geometry the 365 rotor is about 4.6% lighter. Given that all other stuff is the same (slotted, same caliper, same pads, same cooling effectiveness) and assuming all kinetic energy goes into heat to the front brake (which is the absolute worst case) here is what it means: If you fade (=boil fluid) the 365 kit during braking from 110mph to 40 mph, the 380 kit will fade from 112mph to 40 mph. To me this means NO perceptible difference, especially if you factor in cooling and the fact that part of the heat will go tot he back brakes. So I get to keep my 2 sets of stock 18s too.

I didn't bother with rear brakes calculations as I consider them a cosmetic mod.

I couldn't make the same calculations with the stoptech setup because caliper and pads change from the 380 to the 355 kit.

Would be nice if someone could replicate my findings.

Yes, the stopTech does use bigger calipers, rotors and pads for the 380 vs the 355, so heat disapation differences may be greater. At TWS, where I mostly track my speeds are around 140 mph on front straight and 110 on back straight, so brakes heat up quite a bit. I went with the 380's for this reason and they fit my Apex 18" Arc-8's.

ortho281 · 03-18-2013, 08:08 PM

My StopTech BBK has arrived!

Does anyone have an estimate of how many hours it should take to install new kit including stainless steel brake lines?

j2m · 03-18-2013, 08:53 PM

Quote:

Originally Posted by ortho281

My StopTech BBK has arrived!

Does anyone have an estimate of how many hours it should take to install new kit including stainless steel brake lines?

Very nice!!! Congrats!
Are you doing the install yourself?

Porschefile · 03-18-2013, 09:13 PM

Nice looking brakes! It took me about 3-4 hours for front bbk/ss line install, but I was not trying to rush at all and I had a couple of beers. You could definitely do the whole 4 corner setup in that time if you were more concerned about time. It isn't a difficult install really. Use a level or something to prop the brake pedal half down to minimize fluid leakage during the time when the line is not connected.

I don't really get the thermal capacity argument by some people ITT. Yeah, it isn't an insane difference going 355 to 380. But I don't think anyone on this forum could feel the few pounds extra sprung weight. So it is really just a wheel issue, and many 18's fit ST 380. Obviously OP agreed since you got the 380!

ortho281 · 03-19-2013, 08:13 AM

Quote:

Originally Posted by j2m

Very nice!!! Congrats!
Are you doing the install yourself?

Thanks! Yes, I was planning on DIY

Quote:

Originally Posted by Porschefile

Nice looking brakes! It took me about 3-4 hours for front bbk/ss line install, but I was not trying to rush at all and I had a couple of beers. You could definitely do the whole 4 corner setup in that time if you were more concerned about time. It isn't a difficult install really. Use a level or something to prop the brake pedal half down to minimize fluid leakage during the time when the line is not connected.

I don't really get the thermal capacity argument by some people ITT. Yeah, it isn't an insane difference going 355 to 380. But I don't think anyone on this forum could feel the few pounds extra sprung weight. So it is really just a wheel issue, and many 18's fit ST 380. Obviously OP agreed since you got the 380!

Thanks for the info! Hope fully I get all four corners done in around 4 hrs. The 380's will fit my 18's and so this helped my decision.

Moxie · 03-19-2013, 12:15 PM

Great Mod

ortho281 · 03-19-2013, 07:38 PM

Quote:

Originally Posted by Moxie

Great Mod

Thanks man!

Sleeper519 · 03-19-2013, 07:52 PM

Way to go, you will love them! They are confidence inspiring on the track.

ortho281 · 03-19-2013, 08:13 PM

Quote:

Originally Posted by Sleeper519

Way to go, you will love them! They are confidence inspiring on the track.

Thanks! I'm pairing them with StopTech's new SR34 race pads.

Sleeper519 · 03-19-2013, 08:44 PM

Quote:

Originally Posted by ortho281

Thanks! I'm pairing them with StopTech's new SR34 race pads.

That's what I just did as well...

02-13-2013, 12:07 AM	#69
1MOREMOD Major General Drives: at a moderate pace Join Date: Mar 2009 Location: garage Posts: 6,493 iTrader: (3)	yeah thats about right. can go nuts also and really strip the interior of all sound deadening, door panels, speakers, and end up down over 200. __________________ 02 Tiag e46 M3\|6MT\|GC plates\|MCS c.o.\|GC race control arms\|GC bushings & bearings\|BW eng. & tran. mounts\|subframe kit\|BW race shifter\|BW Jaffster knob\|Euro header\|Eisenmann sport\|K&N c.a.i.\|Seibon CF hood\|CSL bumper\|CSL brakes\|RS19s\|SS lines\|half cage\|Recaro profi\|Profi 2 harness\|race pulleys\|BMWpedals\|Apex studs\|1995 Ford Probe gt chump car\|

03-18-2013, 08:08 PM	#80
ortho281 Lieutenant Drives: 2011 E92 M3 6MT Join Date: Aug 2010 Location: Katy, TX Posts: 595 iTrader: (0)	My StopTech BBK has arrived! Does anyone have an estimate of how many hours it should take to install new kit including stainless steel brake lines? Attached Images __________________ Akra Evo / MS stage 2 / MS UDP / VF Tune / KW S/O springs / Vorshlag plates / ST 380/355 BBK / ST SR34 pads / Apex Arc-8 / Nitto NT01 / Schroth Rallye 3

03-18-2013, 09:13 PM	#82
Porschefile Major Drives: E92 M3 DCT, E46, Formula Mazda Join Date: Jul 2008 Location: Tennessee Posts: 1,040 iTrader: (5)	Nice looking brakes! It took me about 3-4 hours for front bbk/ss line install, but I was not trying to rush at all and I had a couple of beers. You could definitely do the whole 4 corner setup in that time if you were more concerned about time. It isn't a difficult install really. Use a level or something to prop the brake pedal half down to minimize fluid leakage during the time when the line is not connected. I don't really get the thermal capacity argument by some people ITT. Yeah, it isn't an insane difference going 355 to 380. But I don't think anyone on this forum could feel the few pounds extra sprung weight. So it is really just a wheel issue, and many 18's fit ST 380. Obviously OP agreed since you got the 380! __________________ #18 Formula Mazda, Southeast Division SCCA

03-19-2013, 12:15 PM	#84
Moxie Lieutenant Colonel Drives: AW E90 M3/SG 335d Join Date: Jul 2009 Location: Stuttgart Posts: 1,776 iTrader: (10)	Great Mod __________________ Evolve - Eisenmann - Challenge - StopTech - Pagid - Eibach - Vorsteiner - BMW Performance - Volk - Advan

03-19-2013, 07:52 PM	#86
Sleeper519 Lieutenant Drives: 08 E92 M3 DCT Join Date: Nov 2009 Location: Atlanta, GA Posts: 506 iTrader: (0)	Way to go, you will love them! They are confidence inspiring on the track. __________________ 2008 M3 Coupe / DCT // StopTech BBK 380/355 / Pagid RS29 / Motul / Apex Arc-8 / Nitto NT-01 275s / Ground Control / MS filter / Performance spoiler / BPM tune // Road Atlanta 1:41.92 / VIR Full 2:13.82 / Barber 1:45.96

03-06-2013, 08:35 PM	#72
Bx Tpr Second Lieutenant Drives: Last year of a dying breed Join Date: Feb 2009 Location: Hopefully Texas in a few years Posts: 218 iTrader: (3)	had st40's installed on my old e90 M. beat the snot out of them 3x at watkins and 2x at limerock. Not much but I also drove the car daily and was able to go from summer to winter to track wheels without worrying about fitment issues around the calipers. also used the same pads all year and never an issue with the castrol srf fluid. amazing product for the price. good luck

03-13-2013, 05:54 PM	#74
jacobe92 Second Lieutenant Drives: 2011 e92 Space Gray Comp pkg, Join Date: Aug 2010 Location: Dumaguete City, Philippines Posts: 220 iTrader: (1)	I had a chance to switch my Brembo 380mm front and rear to 365mm front 345mm rear. I decided to change it for better 18' wheel clearances.

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