sv 650 smart tre
 

Hi, i saw this simple resistor on ebay and was wondering if anyone had fitted one to an sv650sk4 and if this helped throttle response below 4000rpm. The other types of smart tre that you can buy on ebay are basically the same thing for more money. This resistor is a timing retarder eliminator, which is supposed to advance the ignition in the first 4 gears, because standard the bikes ignition timing was retarded to pass emission laws.The guy selling them has sold several for 0.99p Any good or rubbish?:confused: Smart TRE for Suzuki SV1000, SV650, [ TL1000 ? ]

Re: sv 650 smart tre
 

You have just started an epic thread :cool:

p.s. the answers no

Re: sv 650 smart tre
 

better value than the usual TRE's!

Anyway no there's no point on the 650

Re: sv 650 smart tre
 

I would wager that this would most definatly work. I have heard a few people trying this and unleashing another 20 bhp and 40 lbft torque INSTANTLY

on the other hand

no it dosnt work, the SV has only 70 bhp anyway, so if it has any restriction in the lower gears it wont be by much and you wouldnt notice a thing.

You can smooth out the fueling and throttle response for a FI sv by: getting a power commander or similar product and having the mapping adjusted to iron out any dips in the power curve from the dyno, and also by having your throttle bodies synchronised and I beleive, at least on the earlier FI models, fiddling about with the Throttle Position Sensor (there is a thread on here about it).

It is possible to gain a relativly (!!) easy 10 bhp in an SV (giving you about 80) but your money is best spent on higher quality suspension parts, some upgraded brakes (or even just a brake service!) and time in the saddle.

Re: sv 650 smart tre
 

under 4000rpm and under half throttle. Both have to be true for the ignition to be retarded. This isn't an area where most SV riders spend much time, and certainly not somewhere where I would want performance. The TRE doesn't improve the snatchy throttle much either.

I thought it was retarded for noise regulations rather than emissions. Feel free to correct me if I'm wrong.

Re: sv 650 smart tre
 

I think its for both things, probably initially for noise but now emmisions laws are becoming stricter

Re: sv 650 smart tre
 

Don't know much about it, but I can't see how retarding the ignition reduces emissions? I'd have thought it would result in an incomplete burn.

Re: sv 650 smart tre
 

It depends. Latest trend seems to be dumping loads of extra fuel in to soften the noise and adding a catalytic converter to get rid of the unburnt HCs.

Re: sv 650 smart tre
 

I've read a few reports on it being for emissions or noise, but as yorkie chris states the advancing of the ignition supposedly richens the mixture which then reduces noise. I asked if it was worthwhile since they only cost 0.99p! And could be fitted in under half an hour. I have fitted ignition advancers to several of the bikes i have owned over the years and they have all had better bottom end and midrange, but i wasn't sure if there was much to gain from the sv 650. Thanks for all the helpful advice, Nick.

Re: sv 650 smart tre
 

Nonono! Ignition advance and mixture are completely unrelated. Though both affect power.

Like I say search for a post by sv650racer, apparently 4th is a richer map than 2nd or 3rd, which may hurt power.

An ignition advancer can be fitted (offset woodruff key on rotor), but the only people who've had proven gains with these are the people selling them. Other people use them backwards to retard the timing on very built motors.

Re: sv 650 smart tre
 

but as yorkie chris states the advancing of the ignition supposedly richens the mixture which then reduces noise. Oops i'm getting muddled up. Ignore that quote! The tre simply allows a richer mixture in the lower gears by tricking the ecu into thinking that it's in a higher gear. An ignition advancer advances the ignition through all the gears by changing the rotor to one that has a more advanced position. Thanks again, Nick

Re: sv 650 smart tre
 

Lets leave rich/lean out of it for moment :-)

Yes, depends on the advancer. On the readily available type the rotor is the same, you just move it in relation to the crankshaft, so the ECU/ICU gets the "FIRE" signal 4 degrees earlier than it normally would.

The thinking/advertising says that the ignition is retarded in those gears (it is on 1gen too), to get through noise, it is a small amount of retard. Couple of degrees. Maybe you will gain 1bhp at certain throttle positions.


To bring other arguement into it about fuelling, some people (albeit ones who know what they're talking about), say that the 4th gear map is richer (injects more juice). This could be good or bad, it could result in over-fuelling. Or it could mean you'd map it to run good on the dyno, then it would run lean at speed.

Re: sv 650 smart tre
 

Hi, sorry i got a bit muddled. The tre tricks the ecu into thinking its in a higher gear allowing a richer mixture for 2nd and 3rd gear. An ignition advancer is a replacement rotor you fit to advance the ignition timing, which can with certain models of bike improve low down and midrange power. From all the replies it seems the sv 650 would need to have a power commander and dyno time to gain a decent amount of power.Thanks again for your help, Nick.

Re: sv 650 smart tre
 

Needs more than a power commander. Think full system, air filter, cams, bored out throttle bodies :-)

Re: sv 650 smart tre
 

I won't bother trying to gain extra power as i have other bikes. If i fit a race can (purely for a bit more noise) will i need to have the mixture checked or will it be okay to run, as lots of new bikes can have an aftermarket can fitted with no adverse effects. Thanks, nick.

Re: sv 650 smart tre
 

Plenty SV's done lots of miles with an aftermarket can on and no changes to fuelling without any issue.

Biggest "problem" on injected seems to be popping and farting from the PAIR system. But that's just on the overrun and doesn't hurt anything.

Re: sv 650 smart tre
 

Chewy sells blanking off plates for the PAIR valve/inlet/thingummy. But most people like the pops and rumbles. However if your dealer forgets to put the PAIR tube back on, you get a bit more than pops (think shotgun).

Re: sv 650 smart tre
 

You can silicon a bolt in the hole for nowt. The block off plates are good to get rid of the weight of the system entirely though

Re: sv 650 smart tre
 

I'd be more likely to silicon a bolt into the dealer for making the dumbass mistake in the first place :mad:

Re: sv 650 smart tre
 

what is the PAIR system? Is it similar to an AIS sytem on yamaha's where there is a feed from the carbs to a pump, which blows air into the downpipes to reduce emissions.

Re: sv 650 smart tre
 

Yes, feeds from airbox into exhaust ports