Modified SV 650s?

[DarrenSV650S]

Originally Posted by Dave20046

cheers darren. much faffing about involved? Has anyone covered it on here?
I know bibio has some uprated (possibly gsxr) calipers couple with gsxr forks and it stops damn fast.

Should just be a couple of bolts then bleed it, but I'm not sure
I've got gsxr calipers with the sv master cylinder and they are great

[northwind]

Originally Posted by Dave20046

Out of interest are there any worthwhile power mods at all without spending an unjustifiable amount of cash?
A standard SV's what, 72bhp? + airbox and exhaust + usual little mods it churns out what, 72.5 bhp? Suppose if I wanted another 20bhp or so a second had IL4 would have been about the same price.

SV's sub-70 at the rear wheel as standard, generally. For a curvy anything between 65 and 70 is acceptable, depending on dyno error (and type) of course. Full system and breathing can get a reasonable chunk more depending on what parts are used and how well it's done, but, it can be expensive- say £150 for jet kit and filter, £500 for a quality full system, then a few dyno runs. Ouch. (for mine, it was £30 for a used jet kit plus a couple of spare parts, and £100 for my full system, and I jetted it myself using the Butt Dyno with just one £10 confirmation run. But time consuming and not everyone could do it I think) The bottom line is, it's a lot of work or expense, and the upgrade isn't vast- SVs breathe quite well as standard.

The only really sensible power mod for the SV, I think, is a cam swap- dropping in the injected model cams into the intake and putting your old intakes into the exhaust gives about the same power increase as all that breathing stuff, for about £150, fairly DIY-able, with no setup time etc (no adjustability!). That also gives much nicer power characteristics, you lose the hard drop in power towards the redline and you hit peak slightly earlier, so you're within 10% or so of peak power for far longer. Which is better than more peak power tbh, on the road at least. There's an easy increase here because the stock exhaust cams are fairly restrictive (for noise I reckon), and they cause the loss of power at high revs. But surprisingly, there's no significant loss of lower end power. It's almost all advantage.

20bhp, well, it's doable but expensive, and even more so if you don't want to knacker your reliability. Lots of people throw 700cc kits in and various other stuff that push up the power and stress- extra moving weight, as well as bigger bangs. Which can be fine, especially if you don't use the extra power all the time, but could also blow up on you. My fairly soft tune, if I ever finish it and get it all running perfectly, should get close to 85bhp without having much reliability impact, I hope.

And like you say, it doesn't really make sense- an entire TL1000 in decent nick, or similiar, costs way less than the cost of pushing an SV engine to 100bhp, never mind all the other stuff.

Course, that's not the point, if you want to mess with the bike or you basically just want an SV only more so...

[northwind]

Oh, your brakes... How much have you done to the forks? Reason I ask is that I personally reckon that GSXR calipers on anything less than very nicely sorted SV forks isn't the best idea, you get huge power without huge ability to use it. But if you've got emulators or similiar in that's already taken care of.

I do think you possibly have a maintenance issue there tbh, well sorted and with good HH pads the SV brakes aren't poor, they're no wristbreakers but they do the job very well. I'd never have bothered to upgrade mine if it wasn't for doing the fork swap, I think. (Then, I never liked the full-power GSXR brakes, frankly I felt they brought about 50% more power than the bike needs, at the cost of reduced feel/subtlety- for a wet commute they were miserable, on track they were ace)

It might be worth playing with the master cylinder... There's nothing wrong with the SV one at all but there's better. The radial brembo-branded one off a recent R6 is superb for the SV I reckon, it's designed for similiar displacement calipers and gives a nice usability upgrade, not to mention being easier to bleed! I have one of these on now, i used to have a BSB-spec Brembo 18mm but I prefer the R6 item believe it or not.

[Dave20046]

Good idea on the R6 mastercylinder, my sv forks just have uprated springs so you're probably right northy I can't see them complimenting the gsxr calipers very well. I've just got the old excessive lever travel until bite problem and they're a bit spongey, I think the seals are on their way out though.
(I'm on a pointy now btw - so the cam swapping is porbably irrelevant ) Anyway I'm not too bothered about power mods for now, I'm pretty happy with suspension I just want to be able to stop efficiently, that should up bike performance considerably.

[dirtydog]

Yes you can get adapter plates i made a batch a little while ago now you can buy the nicer looking version on sv racing parts. really easy to swap you just bolt the brackets on and the a set of gsxr/sv1000 calipers and bleed them through probably only and hours work. the standard sv hoses will work fine. you don't need to change the m/c either

[northwind]

Well, the calipers would still work, you just don't get the whole benefit. Still probably worth doing but, I reckon from what you describe there's something not right with what you have so better to sort that.

(still, chucking in a K3 GSXR front end or something would get the same brakes, plus the better forks, and done carefully it could be pretty cost-neutral when you sell the SV bits, as those are old uncool GSXR bits. That's what I'd do, did in fact, but ymmv of course, I'm a bit of a GSXR front end fanatic. I reckon 100% that I'd stop faster with standard brakes and GSXR forks than with standard forks and GSXR brakes)

Oh, you can still get some benefit from sticking curvy intakes into the exhaust side, just not as much since you've already got the better intake cam (quick fact- the pointy intake cam spec is the same as the yoshimura stage 2 cam) but it'd still make a little bit of difference. You might be able to find a decent set cheap. In fact, I know i've got a decent intake set in the garage, I just have no idea at all where and I can't face looking for them

[dirtydog]

here's the link
http://cgi.ebay.com/ebaymotors/SV650...Q5fAccessories

they also come in silver

[Dave20046]

Originally Posted by dirtydog

Yes you can get adapter plates i made a batch a little while ago now you can buy the nicer looking version on sv racing parts. really easy to swap you just bolt the brackets on and the a set of gsxr/sv1000 calipers and bleed them through probably only and hours work. the standard sv hoses will work fine. you don't need to change the m/c either

anyone using them with std suspension? Or progressive springs?

[dirtydog]

I do agree with standard forks the gsxr nes do overpower them, i was running progressive springs and heavier oil (am a bit of a porker!) with the gsxr brakes that was pushing it a bit




edit: when i say pushing it, i mean the forks coped ok but any more braking power they would have been all over the place

[yorkie_chris]

Originally Posted by northwind

it's designed for similiar displacement calipers and gives a nice usability upgrade

Displacement is nothing, it is the piston area ratio and leverage that is to consider.