looking for a brake upgrade for j30t

[j30 leopard]

can anyone tell me if there is a swap i can do. i can get cross drilled from stillen but id like to do a big brake upgrade.

[VimyJ]

The J's brakes are pretty good as is but I'd like to see what Diamond might have to say about stopping power for the J30. I just bought new OEM rotors and pads. Love 'em!

[lessthanjakejohn]

Z32 TT brake upgrade perhaps?

Also, if you have the moola, Brembo has a kit for the front brakes for the Z32, perhaps that will adapt for the J30.

[j30 leopard]

im new to the nissan world what is a z32 tt. im not really worried about the money. i roll on 20x8.5 in the front and 20x10 in the rear, so i need to be able to stop.

[nismokid]

z32 tt = 300zx twin turbo

[Q45tech]

The J30 and Q45 front calipers and rotors are identical.....the oem pad compounds are slightly different.The 300zxtt rotors at 26/30mm thickness are not significantly more massive than the oem 28mm Q/J rotors.

[j30 leopard]

so if i order a big brake kit for a 300z it should bolt on. do i need anything else to complete the job

[maxnix]

The rear brakes? Might want to keep the braking effort proportional. Q45tech had some good links posted previously about the consequences of disrupting the balance between front and rear braking forces. The stoptech site may have some information. Best to search and read the posts to garner all links and information.

Easiest way to increase braking performance would be to ditch the 20s and get some good, high quality forged 17s.

[Q45tech]

Based on the weight distribution of the wheel tire, say 20% more, 20% farther out from hub/rotor you probably need to increase brakes half this amount.............finding 2 pound heavier and 1.1>2.0 " [13" vs 11.1"] rotors is expensive just to compensate for big wheels.

oem 15" vs 20" = 33% so my 20% figure is conservative, as is the need for only 10% larger diameter rotors.

[j30 leopard]

thank you for all the info and help. im not really worried about the cost, i would just waste the money on something else i dont need anyway. i have to do the brakes anyway, so before i put the rims on for the summer i wanted to upgrade if possible, can i use the 300z brakes on the rear as well? as far as putting 17s on, i dont race the j just want it to look good.

[maxnix]

Yes, but reread Q45tech's post (in fact, read all of Q45tech's previous posts). The gain is negligible; i.e. not worth the cost.

With front and rear Brembos or other high performance system, you will get greater repeat performance (besides great looks). But if you only want a boulvardier that impresses the ricers and do not care about performance, why bother? Chrome something instead.__________________Brian1995 Q45 & Q45t & 2000 Q45

Discover the power of the button!

[j30 leopard]

i didnt say i dont care about performance but the j is no car to run in the quarter. if i want to race around ill take the bike out. im just seeing what my options are. never need to impress the ricers. thank you for the info

[VimyJ]

The J isn't a rocket ship from a stand still but it does move very well. It is more than a match for most cars on the road which brings me to my point: the J30 is a heavy car capable of high speed precise driving. You have very likely degraded the performance of your J's stopping ability by installing huge rims while still keeping the OEM brake set up. Bear that in mind when you need to do an emergncy manouever. Add in the fact that you have probably exceeded the design "unsprung weight" criteria that was enginneered into your car and have made it more unstable at any speed. I don't mean to presume that you aren't aware of this but when you said you wanted better brakes, everyone here thought you wanted better performing brakes. You threw us for a loop.

[Q45tech]

Just wanted to make sure that you and members understand that the only things that will lower rotor temperatures are heavier rotors and some air ducts to force cooling air onto the rotors.

Most real racers depend on the air ducts [as they are always at speed]...........on the street the rotors/pads/brake fluid get hottest 5-10 minutes AFTER you stop when the heat get localized under the caliper.

Based on front rotors and J30 weight........a single 150 mph stop is doable even in 100F ambient.......this equates to 4 ---75mph to zero stops in a row with only the time for reacceleration [11-13 + 4 secs betwen stops]........assuming you can exert 100 pounds of foot force on the final stop.

The goal is to extend the time it takes the pads and rotor to reach 600F +. [750F with Metal Master pads].

The MM pads [for Q45] will give you at least 1 more stop [5 instead of 4] at same pedal pressure than oem compounds.

[j30 leopard]

q45tech does the front of the j get enuff air now or can i run some duct work to help. basically im trying to keep the braking the same or a little better with the 20s on the car. i made sure they fit then took them off. i need to redo the suspension also seeing that the car has 130,000

[VimyJ]

I don't presume to speak for Dennis but the problem, as I understand it, is that with heavier wheels the rotational momentum becomes the issue. The OEM braking system (which is a high performance system as designed with OEM components) was not designed to stop the rotational inertia of 20" wheels.

You'll also find that there is little in the aftermarket for the J yet alone suspension parts. Member Diamond has done extensive mods on his J amounting to around $30K. All custom made.

[VimyJ]

Should have mentioned that the Touring version J has stiffer springs than the normal model. You could search the salvage yards for these. The sway bars on the T are less stiff.

[j30 leopard]

i have a t

[VimyJ]

i have a t

Diamond would suggest swapping out the T sway bars for base bars. Will make for a harsher ride though.

[diamond]

actually vimy the sway bars smooth the car out.make it ride the way it should,smooth.no harshness what so ever.better,believe that.even with only 15k on my car it made a big noticible smooth difference.best thing i ever did.i would use a break pad that doesnt fade.the wheels are to big,but thats your problem.sorry cant help.in my opinion 20's on a j looks hidiouse.if you want j to look like a 4x4 go ahead.no harm meant,just my opinoin.there have been a few peeps put 20's on there j only to swap them out later.just something ive noticed.looks as good as 20's on a civic.but if your in love with your 20's you wont see that,i guess.to me bling bling is what you cant see.lift it and put on some 13"daytons.that would have more style.but a infiniti cant be a real lowrider either.i get tired of seing 5 million j30's wantin 20"s-----why not 22-24;.20 are small,can5t bling with knowing someones going to go bigger,lol-woops sorry vimmy just noticed what you actually typed,my bad.my refference is to quickor bars.i would recommend porterfield r4-s pads,200.00 delivered.but not wqithout new lines.because of the 20's.how do your brakes respond now.do they heat up.the calipirs can definitally handle the whieght,but that spinning mass i have no idea.i run full porterfield brake system.id paint the calipers to,they ugly.

[#RealRiceGSR#]

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