Soft Rev Limiter

[crash43 Junior Member Find all posts View Profile Close crash43]

Does anyone have info. and a pic on the wire to cut to eliminate the soft (1st stage) rev limiter on a tlr? i believe it is refered to as the "brown wire" or "#25". mahalo and aloha...

[dragonbro need more track time! Find all posts View Profile Close dragonbro]

are you talking about the TRE?

[SDTLR NOT 4 SALE Find all posts View Profile Close SDTLR]

unless you have done motor mods you wont gain anything from adding 500 rpm's. Stock it reaches peak Hp at 9500 or so.

it is the brown wire:dunno that's all I know

[Kazz Evil Twin Find all posts View Profile Close Kazz]

You don't need anymore rpm on a built motor either. Unless it is for overrev but you should be able to cure that by gearing it. My motor flattens out around 8500rpm, typical to the stockers and doesn't drop hp untill it hits the rev limiter. I really wouldn't worry about it on the TL's. NOw, if you had an RC51, that would be another story. I was racing this summer a bit and there was a RC 51 there with all the usual stuff, pipe, airbox, techlusion, and rearsets and other race goodies. He was bouncing that thing off the limiter all the way down the straight. It didn't sound real bad but it was definately missing at higher rpm. Don't ask me why he wasn't shifting sooner. But it would just missfire all the way down the straight. I don't know what the deal is with the soft limiter on those bikes but he was saying it has one and it definately works. Sorry to get off topic...

[crash43 Junior Member Find all posts View Profile Close crash43]

yeah, i just had my bike dyno'd. its making peak hp right around 9600-9700 but the soft rev limiter kicks in at 10000, the hp curve flattens out but hasn't really dropped off. it'd be nice to have another 5-700 rpms of over-rev.... come on, i know some of u guys that hit the track would know... right?

ok so maybe its because my last bike was an r6... that thing had about 2000 rpms of over-rev... well off the hp peak...

[mike_r gp star Find all posts View Profile Close mike_r]

ya, i find i'm always bouncing off the limiter, would be nice to have that extra over-rev, especially on tight short tracks, though gearing would solve the problem though like mentioned above.

[Steve TLS Thunder from downunder Find all posts View Profile Close Steve TLS]

clipping valves, the ultimate rev limiter. Anyone bother to check their valve to piston clearances before upping the rev limit

[TillerNOS You Got Mail, Bitch! Find all posts View Profile Close TillerNOS]

Not to get off topic...

Originally posted by crash43
yeah, i just had my bike dyno'd. its making peak hp right around 9600-9700 but the soft rev limiter kicks in at 10000, the hp curve flattens out but hasn't really dropped off. it'd be nice to have another 5-700 rpms of over-rev.... come on, i know some of u guys that hit the track would know... right?

ok so maybe its because my last bike was an r6... that thing had about 2000 rpms of over-rev... well off the hp peak...

But we have another Oahu Hawaii Tiller rider!
Welcome and hopefully soon like next weekend there will be a ride with the 3 of us, that I know of. SGTWILL and I are the only other TLR riders on the island that I know of.....let me know....
Chris

[crash43 Junior Member Find all posts View Profile Close crash43]

Re: Not to get off topic...

Originally posted by TillerNOS
But we have another Oahu Hawaii Tiller rider!
Welcome and hopefully soon like next weekend there will be a ride with the 3 of us, that I know of. SGTWILL and I are the only other TLR riders on the island that I know of.....let me know....
Chris

Cool... yeah, I moved here from Seattle last year, haven't had much time riding the bike 'cause I've been swamped at the new job... but now I'm settled and ready to get back into it. I've seen two tillers around. a yellow one parked at Straub hospital and a silver one near Pearl Harbor. I would love to go tool around... oh-yeah thanks for the welcome...

[crash43 Junior Member Find all posts View Profile Close crash43]

Originally posted by Steve TLS
clipping valves, the ultimate rev limiter. Anyone bother to check their valve to piston clearances before upping the rev limit

yeah, if you way over-rev an engine the valves could float which would definitely have some unwanted consequences.... however, as i understand it the tlr has 2 rev limiters, "soft" and "hard" (not quite sure why they term them like that, as i believe they both work essentially the same way). cutting the soft limiter gives you 500-700 rpms more before the hard limiter cuts in. i don't think that extra will cause the valves to float. its definitely not going to stress the engine anymore than hotted up cams, NOS or any of that... superbike magazine had a modded tlr, with the soft limiter cut... just wish i could find that old article...

[TLR-NUT Member Find all posts View Profile Close TLR-NUT]

The wire you want to cut is the #25 on the large plug. I'v been told you can disconnect it without cutting it by using a pin to disconnect it from the plug. I just cut mine. The redline goes from 9800 to 10300 rpm's. No worries about over-reving. You would only be matching the TLS for revs.

[adavis Evil Twin Find all posts View Profile Close adavis]

Rev limit

Valve springs are the first mechanical limit for rpm on a TL. The only way of getting past 10,300 rpm that I have found is to send your ECU to Superchips in the UK. This will get you 10,700 rpm. If the motor is built you may be able to use this. I have a built motor I have not run yet. It has 80lbs seat pressure for valve springs. Stock is around 60lbs.

[crash43 Junior Member Find all posts View Profile Close crash43]

Originally posted by TLR-NUT
The wire you want to cut is the #25 on the large plug. I'v been told you can disconnect it without cutting it by using a pin to disconnect it from the plug. I just cut mine. The redline goes from 9800 to 10300 rpm's. No worries about over-reving. You would only be matching the TLS for revs.

Thanks much. Thats just what I needed. BTW, any idea why they restricted the TLR revs and not the TLS? I thought the TLR was s'posed to be the "race" version.

[crash43 Junior Member Find all posts View Profile Close crash43]

Re: Rev limit

Originally posted by adavis
Valve springs are the first mechanical limit for rpm on a TL. The only way of getting past 10,300 rpm that I have found is to send your ECU to Superchips in the UK. This will get you 10,700 rpm. If the motor is built you may be able to use this. I have a built motor I have not run yet. It has 80lbs seat pressure for valve springs. Stock is around 60lbs.

Dude, this is great info. I don't know if I have $$ to build up a seriously fast engine.... you have to keep us posted on your engine. i really wish 'zuki would have kept up the race program/development on the tlr, as it ends up they probably would have gotten more mileage out of it, as it looks like 750s in superbike are pretty much history.

[adavis Evil Twin Find all posts View Profile Close adavis]

Rev Limit

Both the TLR and the TLS are limited to under 10,000rpm stock. I do not care what the tach says put a accurate measurement on them and that is all they rev. I have not measured both side by side but I am told by someone who has that the TLR has more seat pressure on the valve springs. I also have been told by someone who has blown them up the the TLS does not like more than 10,000rpm. My modified motors have always had a rising power curve right to the rev limeter to 9,800rpm. So I look forward on the new motor to see what happens after that. Know what shape your valve springs are in before you explore this area.