I've installed the Power Commander V and on dyno I have 51,3 HP on the wheel
What was your stock reading before this
Exhaust Mod?
- Thread starter purplesea
- Start date
What was your stock reading before this
Skutorr
Active member
You get almost the same exact improvement with this (with a better exhaust) for under $100 and it's "plug-and-play"!
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Might just do that exhaust this year soon, but...the last thing I want is to sound like a Thai bike racer...ya know?
LanceTokyo
Member
Sorry, don't quite understand. and want to get this right.You get almost the same exact improvement with this (with a better exhaust) for under $100 and it's "plug-and-play"!
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The emulator alone adds 4-5 hp at the rear wheel, or the emulator plus a better exhaust yields an additional 4-5 hp?
Thanks!
Skutorr
Active member
Emulator plus a better (less-restrictive) exhaust will do it together. The emulator tells the CPU that it's actually running LEANER than it is, so it riches up the mixture, for better all-round performance, especially mid-range passing and top end. You tend to run leaner with a less restrictive exhaust, and the stock CPU and injectors can only add so much fuel per the existing mapping. The bikes all lean-out at high RPMs, as they are hitting the limits of the stock airflow and fuel system.
With the less restrictive exhaust (but not TOO much, or it kills your bottom end through lack of needed back pressure at lower rpms) and emulator I've got HALF the planned changes. I'm replacing my fuel pump with one that has a higher flow rating, coupled with a higher-pressure Fuel Pressure Relief Valve, going from 2.2 BAR to 3.1. To add more air coming in, I'm putting on longer ram stacks/air trumpets than the little stock rubber ones in the air box. This males a BIG difference in total system airflow from mid-range rpms on.
Remember, this is all AFTER you make the insanely cheap and effective upgrades to the variator system: Dr. Pulley Sliders and Sliding Pieces, and either a White or Yellow Malossi counter-spring, to increase the "downshift" rpms when you go full-throttle. THEN go for engine system upgrades.
With the less restrictive exhaust (but not TOO much, or it kills your bottom end through lack of needed back pressure at lower rpms) and emulator I've got HALF the planned changes. I'm replacing my fuel pump with one that has a higher flow rating, coupled with a higher-pressure Fuel Pressure Relief Valve, going from 2.2 BAR to 3.1. To add more air coming in, I'm putting on longer ram stacks/air trumpets than the little stock rubber ones in the air box. This males a BIG difference in total system airflow from mid-range rpms on.
Remember, this is all AFTER you make the insanely cheap and effective upgrades to the variator system: Dr. Pulley Sliders and Sliding Pieces, and either a White or Yellow Malossi counter-spring, to increase the "downshift" rpms when you go full-throttle. THEN go for engine system upgrades.
hmm..thats a 30% change in base fuel pressure..i'm concerned by that. I don't know of any stock systems that have a LT/ST trim allowance for more than 20%, and adding in a higher pump capability could alter that more, depending on the return/return-less nature of the fuel system...I'm going to assume it is a return system. Is it free flowing or does it have a limiting orifice? I again, assume free.
Free flowing would be best..but still, I have concerns over raising the base fuel pressure that much and being beyond the ECUs capability to manage trims. And the O2 simulator, is that just lowering the actual sensor reading xx% at any point, to ask the ECU to add _more_ fuel? Too much makes less power than you _could_ make. Even if it tries to simply always deliver what it wants the ECU to believe..to get a 12.8:1 AFR, the ECU is unlikely able to handle the injector pulse adjustment against a 30% gain in base pressure.
Im on board 100% with what you're doing, but..you need to get some data logging, you're stacking too many fuel changes on top of each other. WBO2 packages are cheap.
I keep hoping someone will have an ECU mapper package for our ECUs...after warranty I will likely go aftermarket.
I mean, nothing Im reading..can get much good data at all from our ECUs, the 911 can do basics..awful pricey to "find out" what it can/cant do.
Free flowing would be best..but still, I have concerns over raising the base fuel pressure that much and being beyond the ECUs capability to manage trims. And the O2 simulator, is that just lowering the actual sensor reading xx% at any point, to ask the ECU to add _more_ fuel? Too much makes less power than you _could_ make. Even if it tries to simply always deliver what it wants the ECU to believe..to get a 12.8:1 AFR, the ECU is unlikely able to handle the injector pulse adjustment against a 30% gain in base pressure.
Im on board 100% with what you're doing, but..you need to get some data logging, you're stacking too many fuel changes on top of each other. WBO2 packages are cheap.
I keep hoping someone will have an ECU mapper package for our ECUs...after warranty I will likely go aftermarket.
I mean, nothing Im reading..can get much good data at all from our ECUs, the 911 can do basics..awful pricey to "find out" what it can/cant do.
LanceTokyo
Member
Thanks, Skutorr for the exhaust / emulator notes.
On this comment,
"Remember, this is all AFTER you make the insanely cheap and effective upgrades to the variator system: Dr. Pulley Sliders and Sliding Pieces, and either a White or Yellow Malossi counter-spring, to increase the "downshift" rpms when you go full-throttle. THEN go for engine system upgrades."
I've read the 2016-on CVTs were modified - I'm pretty happy with mine - does this variator mod still improve even the 2018 models? Perhaps just not as much as the earlier models.
(I have zero experience with scooters of any sort and am trying to catch up with decent ideas, of which there are several on this forum. Also very few around in Tokyo, it seems.)
Thanks!
On this comment,
"Remember, this is all AFTER you make the insanely cheap and effective upgrades to the variator system: Dr. Pulley Sliders and Sliding Pieces, and either a White or Yellow Malossi counter-spring, to increase the "downshift" rpms when you go full-throttle. THEN go for engine system upgrades."
I've read the 2016-on CVTs were modified - I'm pretty happy with mine - does this variator mod still improve even the 2018 models? Perhaps just not as much as the earlier models.
(I have zero experience with scooters of any sort and am trying to catch up with decent ideas, of which there are several on this forum. Also very few around in Tokyo, it seems.)
Thanks!