Triumphrat

scotthubbard · 10-08-2009, 04:14 AM

I have a 2001 TT, running a baffle removed road legal scorpion exhaust and K&N. I also have a tuneboy for tuning/error code reading.

I know the TT's suffer a 'flat spot' in the low revs, but mine seems to have gone beyond that an has started surging between 3-4000 rpm.

If i am on a slightly positive throttle the fueling will surge, and get worse until i throttle it past 4000 rpm when it will settle down again. It is unrideable at between 3-4000 at times, and it does this in neutral too. Now i know many will say just change down a gear and ride beyond 4000 rpm but you end up about 3500rpm in second or third at around 30 mph which is where you spend most of your time in traffic or filtering.

Is this beyond what can be classed as normal for the TT? I think it has actually got worse recently but that may be me being optimistic.

Is there any adjustment anyone can recommend on the tunes via tuneboy? It does this with the baffle in or out and on all the post 2001 tunes.

Any input appreciated. Thanks.

GNTurbo6 · 10-08-2009, 12:32 PM

Tuneboy will fix it. It's an issue with a timing gap that was added because of emissions requirements.

BombFactory · 10-09-2009, 02:09 AM

If you take a look at the 3D graph in TuneEdit, you'll see the gaps in fueling and timing between approx 2,500 and 6,000 rpm. Those are the main issues with the power loss in that range. However, the CO being set properly is also key.

scotthubbard · 10-10-2009, 11:28 AM

how do you set the o2? I know it has to be in a temperature range but the tuneboy wouldn't let me set it between 85 and 95 dc.
also what value should it be? I thought the tt had no o2 sensor so is it just guess work?

Will · 10-10-2009, 01:21 PM

It's the CO, not O2. TuneBoy calls it Fuel Idle Trim. Once you find it, it's really easy to adjust. I never did anything more than ride it and trust the butt dyno, although an exhaust sniffer would make for a much more precise adjustment.

EmmBeeDee · 10-11-2009, 11:15 PM

We were out on our TT600 today and it seems to have the same kind of surging reported by the OP, to the point that my wife, whose bike it is, is thinking of selling the bike.

She's not interested in spending money unless it's likely to fix it properly, so what would be the best (read cheapest) way to fix the surge?

She likes everything else about the bike but when we were on a nice twisty road, it took all the fun out of it.

We'd even be happy to lose some power if it meant it ran cleanly.

Please help, or we're going to have to trade the bike... the original plan was to make a track day bike out of it but it wouldn't be any fun at that the way it is.

The bike seemed much worse today, where the temperature was around +8 to +10C all day (around 47F) - we think it ran better when it was hotter out.

BombFactory · 10-12-2009, 01:27 AM

Quote:

Originally Posted by EmmBeeDee

We were out on our TT600 today and it seems to have the same kind of surging reported by the OP, to the point that my wife, whose bike it is, is thinking of selling the bike.

She's not interested in spending money unless it's likely to fix it properly, so what would be the best (read cheapest) way to fix the surge?

She likes everything else about the bike but when we were on a nice twisty road, it took all the fun out of it.

We'd even be happy to lose some power if it meant it ran cleanly.

Please help, or we're going to have to trade the bike... the original plan was to make a track day bike out of it but it wouldn't be any fun at that the way it is.

The bike seemed much worse today, where the temperature was around +8 to +10C all day (around 47F) - we think it ran better when it was hotter out.

If the engine is causing surging while you are riding above 6,000 rpm, it is not the mapping that is the issue (unless you have a muffler with very little back-pressure), but there is another issue (like the throttle position is out of adjustment, etc.). Assuming the proper map is installed and there are no other issues, the easiest and cheapest fix is to keep the engine in its designed powerband, which is above 6K rpm. Depending on what kind of muffler you are running, having a dealership load either a stock or aftermarket exhaust 2002 TT600 tune and adjust the CO setting should make the bike perfectly rideable. If it doesn't, there is something wrong other than fuel mapping.

EmmBeeDee · 10-12-2009, 09:15 PM

Quote:

Originally Posted by BombFactory

...having a dealership load either a stock or aftermarket exhaust 2002 TT600 tune and adjust the CO setting should make the bike perfectly rideable. If it doesn't, there is something wrong other than fuel mapping.

The exhaust system's completely stock, as well as everything else we've looked at already - air filter, etc.

We're going to take the bike to a local Triumph shop and ask them to verify the tps, mixture and other settings are right, to see if we can tame it a bit. We hope it's not just "the nature of the beast".

Anyone know of someone local to the Ottawa, Ontario, Canada area we can deal with who's got the expertise and tools to check this out, instead of taking it to the shop?

Agkistrodon · 10-13-2009, 03:59 AM

I would have a triumph shop check with their diagnostics tool to see if everything is going normal. I recomend going up 2-3 teeth on the rear sprocket for this bike. it seems to like this gearing better.

Will · 10-14-2009, 02:27 PM

Quote:

Originally Posted by EmmBeeDee

The exhaust system's completely stock, as well as everything else we've looked at already - air filter, etc.

We're going to take the bike to a local Triumph shop and ask them to verify the tps, mixture and other settings are right, to see if we can tame it a bit. We hope it's not just "the nature of the beast".

Anyone know of someone local to the Ottawa, Ontario, Canada area we can deal with who's got the expertise and tools to check this out, instead of taking it to the shop?

If it's bone stock, then it just needs to be set up properly to run right. When set up properly, they pull like a freight train (relative) from low range and fuel much more cleanly than you might expect. It just takes a certain amount of patience and precision to do. A good technician should have no problem doing it for you.

And as Agkistrodon mentions, lowering the gearing by putting a bigger rear sprocket on the bike helps a lot. It doesn't hurt fuel mileage, either.