2020 V4S Bren Tune Review

Hey all, I picked up a new V4S a couple of weeks ago, dealer had already installed Akra slip ons, dry clutch, mirror block offs, and fender kit. They also had the akra upmap done as well. Late last week I flashed the ECU with the Bren tuning map and I wanted to give some feedback based based on what I see/feel riding it now vs when it had the dealer upmap on it.

1. Idle is way smoother, this is especially noticeable when chopping the throttle and pulling the clutch in, it gets right to a nice smooth idle and not once has it stalled, which was happening way too often prior to the flash.
2. Low and Mid range drivability is smoother and more responsive
3. Upper end power is increased. Hard to quantify this other than my personal observations but the bike now wheelies much easier around the 85-100 MPH area than it did before, so safe to assume there is at least a bit of additional HP in it. The wheel lifting has caught me off guard a few times since I am not used to it happening that easy compared to pre-flash.


Bike is going on the dyno tomorrow so I will have numbers with both the Bren tune and the stock tune. Will be running 93 octane as usual. Will post the results tomorrow afternoon, stay tuned.

Looking forward to seeing that. Would love to see someone dyno with some VP T4 or ms109 as well.

Keith197 said:

Looking forward to seeing that. Would love to see someone dyno with some VP T4 or ms109 as well.

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Yeah I have a map for VP MR12 (101 octane), but doubt I can get my hands on some tomorrow morning in time for the dyno session but eventually I’ll get it on the dyno with some.

Results are in.

Dyno was a Dynojet. Operator said its an older model that was rated to like 150 so we did the pulls in 3rd gear so power would appear lower than in 5th gear, which definitely turned out to be the case. I was not interested in peak numbers more than I was about the power differential between the stock and Bren tune. Next time I will find a newer Dynojet to run it in 5th gear and see how it does from a max HP perspective.

Sequence of pulls was: Bren tune, dealer akra upmap, back to the Bren tune. I reflashed it myself on the dyno between runs so I know it was done correctly. I went back and forth to eliminate/validate any heat or tire pressure variances. No tach signal and pulled AFR from the tailpipe.

Bike did 184 HP on both the dealer akra tune and Bren tune in 3rd gear. Power curves were near identical as was AFR curve, which was very rich at 11.5 toward the high end of the graphs. You can all draw your own conclusion as to the mappings within the tune file. The richness leaves a lot of power on the table and is just way too much fuel for a naturally aspirated engine, I've tuned nitrous engines to 11 so to see a tuned NA bike run that rich is very surprising.

Dyno operator did comment that the tune did change the fly by wire operation and as I noted before the idle and low/mid range drivability is improved.

Will post graphs as soon as the operator emails them to me.

And here is graph. Green was with Bren (no AFR sniffer that time), blue back to dealer upmap, red back to bren.

One thing to note is that you can see that the ECU was definitely flashed with a modified file since those pulls go farther out, representing the rev limiter increase from the tune.

Working with Bren now on this to see what is going on.

you did not get a comparison to stock tuning?

I have comparisons to the termi upmap vs the stock tuning in all gears on my site

vcyclenut said:

you did not get a comparison to stock tuning?

I have comparisons to the termi upmap vs the stock tuning in all gears on my site

UpMap testing

FLASHED BY VCYCLENUT

www.vcyclenut.com

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Yes I did, my bike came stock with an Akra upmap since the exhaust was done at the dealer prior to purchase. That is the blue line in the graph.

brad8266 said:

Hey all, I picked up a new V4S a couple of weeks ago, dealer had already installed Akra slip ons, dry clutch, mirror block offs, and fender kit. They also had the akra upmap done as well. Late last week I flashed the ECU with the Bren tuning map and I wanted to give some feedback based based on what I see/feel riding it now vs when it had the dealer upmap on it.

1. Idle is way smoother, this is especially noticeable when chopping the throttle and pulling the clutch in, it gets right to a nice smooth idle and not once has it stalled, which was happening way too often prior to the flash.
2. Low and Mid range drivability is smoother and more responsive
3. Upper end power is increased. Hard to quantify this other than my personal observations but the bike now wheelies much easier around the 85-100 MPH area than it did before, so safe to assume there is at least a bit of additional HP in it. The wheel lifting has caught me off guard a few times since I am not used to it happening that easy compared to pre-flash.


Bike is going on the dyno tomorrow so I will have numbers with both the Bren tune and the stock tune. Will be running 93 octane as usual. Will post the results tomorrow afternoon, stay tuned.

Click to expand...

Has anyone tried up map for the T800 and a tune? I got one for my Street fighter and it was a amazing change.

Somefun said:

Has anyone tried up map for the T800 and a tune? I got one for my Street fighter and it was a amazing change.

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look 2 posts above yours

vcyclenut said:

look 2 posts above yours

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Whoops lol. I Bought a T800 already from you for my street fighter it worked out great. Can I use the same t800 on my V4 panigale? But just buy another map?

Also did UpMap manipulate the throttle like Brent did so it has more ramping like a quick turn throttle set up?

Somefun said:

Whoops lol. I Bought a T800 already from you for my street fighter it worked out great. Can I use the same t800 on my V4 panigale? But just buy another map?

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yes, i am 99% sure you can

vcyclenut said:

yes, i am 99% sure you can

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Are you sure about this?

Can I use the T800 UpMap device on multiple bikes?
No, the T800 device is designed to bind only to a single bike (the first on which configuration is carried out). To use the UpMap system on more bikes, you must purchase a new T800 for each bike.

Tricky1 said:

Are you sure about this?

Can I use the T800 UpMap device on multiple bikes?
No, the T800 device is designed to bind only to a single bike (the first on which configuration is carried out). To use the UpMap system on more bikes, you must purchase a new T800 for each bike.

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.... that would have made the decision a whole lot easier on which tune to go with. But if the Bren tune actually remaps the throttle to come in sooner and forces it to 100% WOT I'm in.

Somefun said:

But if the Bren tune actually remaps the throttle to come in sooner and forces it to 100% WOT I'm in.

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It does.

Somefun said:

.... that would have made the decision a whole lot easier on which tune to go with. But if the Bren tune actually remaps the throttle to come in sooner and forces it to 100% WOT I'm in.

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sure doesnt look like it does from the dyno charts posted

Tricky1 said:

Are you sure about this?

Can I use the T800 UpMap device on multiple bikes?
No, the T800 device is designed to bind only to a single bike (the first on which configuration is carried out). To use the UpMap system on more bikes, you must purchase a new T800 for each bike.

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you are correct, i should have looked it up instead of assuming, thanks for clarifying

Wow these Bren guys have absolutely gone bonkers. I don't know why people are using this crap might as well stick a Rapid Bike on the bike and have it not much better then what comes from the factory. Wake up people tuning these bikes like the superbike teams do with stuff that's available off the shelf dyno not needed is out there and not expensive.

Mick1976 said:

Wow these Bren guys have absolutely gone bonkers. I don't know why people are using this crap might as well stick a Rapid Bike on the bike and have it not much better then what comes from the factory. Wake up people tuning these bikes like the superbike teams do with stuff that's available off the shelf dyno not needed is out there and not expensive.

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We are thinking something happened with this. I am resetting the handheld this morning and we are going to do a new stock pull form me ECU and try this over again.

Mick1976 said:

... tuning these bikes like the superbike teams do with stuff that's available off the shelf dyno not needed is out there and not expensive.

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what is already available and not that expensive?