THUNDERMAX: Tmax timing curve advice
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Intermediate
Joined: Dec 2016
Posts: 29
Likes: 5
From: Denver
Tmax timing curve advice
Greetings. I have a FXDB running a TMAX ecm. This was a Stage 4/5 SE 110" kit that I've since sweetened with some bigger cams (.617"/.590" with 252/260 duration) and some major headwork with bigger valves (2.00" intake) and hand porting, along with dual valve springs and titanium upper retainers.
I've done several "auto-tune maps" and the A/R ratio's seem to be pretty solid. Even at 5300ft, this bike is FAST.
That said, reading forums and digging, along with some looking into my tables makes me believe I'm leaving some throttle response/hp on the table
with this build and the stock TMAX timing values.
I'm looking for any advice or perhaps someone I could send my current map to in order to see where you, the expert tuners, would like the timing set
if it was your bike. I believe i'm seeing about 31 degrees from 3000k-6200rpm at WOT.
My WOT A/R ratio is pegged at 13.0/1 from 3000k rpm+. I assume I can gain a little by moving it to 12.8? (My experience is with water-cooled N/A cars. I assume these air-cooled engines might be different).
Thanks again. The current tune is really good, not great, and I'd love to learn this platform really well as I'm an Petro. Engineer by trade and love geeking out on this stuff.
I've done several "auto-tune maps" and the A/R ratio's seem to be pretty solid. Even at 5300ft, this bike is FAST.
That said, reading forums and digging, along with some looking into my tables makes me believe I'm leaving some throttle response/hp on the table
with this build and the stock TMAX timing values.
I'm looking for any advice or perhaps someone I could send my current map to in order to see where you, the expert tuners, would like the timing set
if it was your bike. I believe i'm seeing about 31 degrees from 3000k-6200rpm at WOT.
My WOT A/R ratio is pegged at 13.0/1 from 3000k rpm+. I assume I can gain a little by moving it to 12.8? (My experience is with water-cooled N/A cars. I assume these air-cooled engines might be different).
Thanks again. The current tune is really good, not great, and I'd love to learn this platform really well as I'm an Petro. Engineer by trade and love geeking out on this stuff.
Last edited by MileHighDyna; Jul 5, 2019 at 05:10 AM. Reason: spelling
Hard to find many people that want to help with tmax especially with timing. Might want to look through the different maps that are close to you stroke and cams to check out the different timing curves. I’m auto tuning mine now and once completed, there is a different timing table I want to try that is a little more aggressive. Bringing in the timing about a thousand rpms sooner and a little more in the midrange.
Tourer
Joined: Feb 2015
Posts: 268
Likes: 36
From: Athens Greece
why would say its leaving some HP on the table?
im not proficient in TTS but tuning these efi systems is pretty generic across the mfg's as long as you know how to work your tuner..
what exactly is going on?.. usually there is an indication of something somewhere in the rpm table not right, a dip, lag, surge or spike thats throwing off the balance
your VE tables will give you alot of info, as well as recording actual data and replaying to show you whats going on AS you ride which that by itself is a clear indication of what needs to be adjusted and where
is it floating? slowing down its climb? surging and bucking?
im not proficient in TTS but tuning these efi systems is pretty generic across the mfg's as long as you know how to work your tuner..
what exactly is going on?.. usually there is an indication of something somewhere in the rpm table not right, a dip, lag, surge or spike thats throwing off the balance
your VE tables will give you alot of info, as well as recording actual data and replaying to show you whats going on AS you ride which that by itself is a clear indication of what needs to be adjusted and where
is it floating? slowing down its climb? surging and bucking?
Last edited by ghost183; Dec 1, 2019 at 04:00 PM.
Tourer
Joined: Feb 2016
Posts: 486
Likes: 155
From: British Columbia
When adjusting the timing away from the canned tunes, you still have to wait for the air fuel ratio to adjust in to the new set of parameters (auto tune), if you're maintaining a preset air fuel ratio. I've played around with my timing a fair bit. Not at all with the air fuel ratios. I've found that in the lower end RPM's you can in fact steepen the timing curve ramp quite a bit. Getting up around 3000 rpm and out 30 to 31 degrees advance about all these engines tolerate before pre ignition. Use as high an octane as you are willing to pay for (I use 94 Chevron) and tune around that standard. The more you play with your TMax the more you learn and the more proficient you become. I believe Max(Headroom)? could chime in. He seems pretty knowledgeable about ThunderMax. Failing doing it yourself, find a good T Max tuner guy with a dyno and let him get you there for a few hundred dollars. Best of luck.
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