vacuum reserve canister e21 booster

[328ijunkie]

Yeah i was suggesting he use the E34 V8 remote mount setup.

And an example of the setups i use:

[LJ851]

^ I completely mis read your last post, it all makes sense now.

[328ijunkie]

;)

[nando]

Ah well in that case... uh... E34 V8 setup? lol. Never had to do that yet haha. But i def wouldnt run a E21 booster on a car with that kinda power...

I think I'd rather do a manual conversion. lol

[sludge1300]

Finalllly tried the reserve canister out on track last weekend. It has been so long since I've been to the track that my perspective is a little skewed, but I will say that I still had to stomp on the pedal pretty hard to get the desired braking force. I want to say it helped a little bit, but can't say for sure. Thinking about moving to an ix booster....

[LTDScott]

Finalllly tried the reserve canister out on track last weekend. It has been so long since I've been to the track that my perspective is a little skewed, but I will say that I still had to stomp on the pedal pretty hard to get the desired braking force. I want to say it helped a little bit, but can't say for sure. Thinking about moving to an ix booster....

What pads are you using?

[sludge1300]

Carbotech xp10 all the way around. The funny thing is last weekend i was getting really used to my almost manual brakes, then i hopped in the pickup at the end of the day and locked up the brakes at a stop sign! Oops.

[LTDScott]

Interesting. I just swapped an E21 booster into my race car, and I've heard lots of complaints that the brakes don't have enough boost for street driving, but I'm not really concerned about street manners as this is on a dedicated track car which will have "bitey" race pads. The only feedback I've gotten is from my co-worker who actually loved the feel of the E21 booster with race pads.

[nando]

Carbotech xp10 all the way around. The funny thing is last weekend i was getting really used to my almost manual brakes, then i hopped in the pickup at the end of the day and locked up the brakes at a stop sign! Oops.

lol. I did this all the time jumping from my E30, to my wife's 2003 Sentra, which has way, way overboosted brakes (and no ABS). plus she had the most god awful, rock hard 900tw tires on it. If you sneezed on the brakes, they'd lock up (and she'd be pissed).

how about the vac pump idea? I think the E46 M3 comes with one stock?

[FredK]

For track use, I'd say that an E21 booster will feel pretty darn good. I haven't tracked my car too much, but with HT-10s and a 25mm MC I never worried braking power. The only thing that DID suck was the disparate pedal height between the brake pedal and accelerator, which made heel-toe nearly impossible.

[sludge1300]

Interesting. I just swapped an E21 booster into my race car, and I've heard lots of complaints that the brakes don't have enough boost for street driving, but I'm not really concerned about street manners as this is on a dedicated track car which will have "bitey" race pads. The only feedback I've gotten is from my co-worker who actually loved the feel of the E21 booster with race pads.

For track use, I'd say that an E21 booster will feel pretty darn good. I haven't tracked my car too much, but with HT-10s and a 25mm MC I never worried braking power. The only thing that DID suck was the disparate pedal height between the brake pedal and accelerator, which made heel-toe nearly impossible.

I think you guys have some good points, and in some ways it does feel good, esp cuz there is so much room for modulation. However, maybe it's just me being a novice - intermediate driver, but I struggle with the big braking zones that need a 2 gear downshift. It doesn't feel very natural, stomping on the pedal that hard, and then trying to finesse the gas, and brake release. I should probably just quit whining and practice more. Good thing I'm heading back out there on Saturday....

[LTDScott]

Yeah, my co-worker says modulation and feel is great with the E21 booster and race pads.

I can definitely identify, as my other project car ('85 Ford) has pretty firm brakes that require a good amount of pedal effort with street pads (Hawk HPS). This has caused a few pucker moments during hard stops in traffic. Conversely with more aggressive pads (Hawk HP+), the brakes feel great and have plenty of bite. I imagine it should feel the same on my E30 with proper track pads (which I have yet to choose - will have to do some research there!).

[nando]

hawk HPS are terrible, they don't even work well with the stock MC and dual chamber ix booster.

you know it's bad when your wife is afraid to drive your car because she doesn't think she will be able to stop.

[eurosport22]

so if the e21 booster is good with race pads... then what are the race pads to buy if your running the booster...? i def notice standing rather hard on the m coming up on traffic from 120mph ... moreso than with the stock setup but im not concerned. but i wouldnt mind running some nicer pads in case i wanna track it one weekend but i mostly just drive it hard on the streets around here haha. so its kind of a semi dd. hope im not thread jacking but its kinda related. what kind of e21 booster + pad combinations are people running that end up pretty nice. better than oem pads/rotors at least. i also have some drilled rotors but factory calipers.

[sludge1300]

so if the e21 booster is good with race pads... then what are the race pads to buy if your running the booster...? i def notice standing rather hard on the m coming up on traffic from 120mph ... moreso than with the stock setup but im not concerned. but i wouldnt mind running some nicer pads in case i wanna track it one weekend but i mostly just drive it hard on the streets around here haha. so its kind of a semi dd. hope im not thread jacking but its kinda related. what kind of e21 booster + pad combinations are people running that end up pretty nice. better than oem pads/rotors at least. i also have some drilled rotors but factory calipers.

Good question. I'd be curious as well. I mentioned this earlier, but I'm running Carbotech XP10 and it doesn't have a ton of bite. However, with my street tires on the track, i have experienced no brake fade, so don't see the need to go to xp12. Perhaps some Hawks?

Anyway, I can confidently say now that the reserve canister did not reduce pedal effort for me. I bought a brand new 944 booster because I want to relax a bit more behind the wheel. I do however plan to leave the reserve canister in, as I presume it will help maintain constant breaking force throughout a long stroke or close consecutive braking points. I will experiment with this at the track. One run with the reserve canister plugged in, one without.