Performance mods to GTS300 Super?
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Hooked
2012 GTS 300 Super (Charlene) 1832cc cruiser (The Lambo)
Joined: 16 Dec 2020
Posts: 107
Location: Tigard, OR
Sat Jan 09, 2021 10:11 am quote
Iíve searched...
Anyone with the above model (or similar) who has modded for better performance and had it on a dyno?
Exhaust, variator kit, fuel controller, etc?
My concern is that there are many vehicles that you simply canít squeeze much extra power from and the cost per % HP/TQ gain is stupid...unless you just love squeezing more fun out of your machines. Thanks in advance!
Hooked
2012 GTS 300 Super (Charlene) 1832cc cruiser (The Lambo)
Joined: 16 Dec 2020
Posts: 107
Location: Tigard, OR
Wed Jan 20, 2021 8:38 pm quote
Didnít think my post would get over 100 views without a reply with some feedback. Think Iíll add the POLINI EVOLUTION COMPLETE VARIATOR KIT WITH SPECIAL BELT GTS/GTV 250-300 (INCLUDES 15.7 GR ROLLERS) then evaluate further.
Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
Joined: 01 Nov 2005
Posts: 2823
Location: Sydney, Australia
Wed Jan 20, 2021 9:15 pm quote
The only real performance mod for the 300 is a Malossi cylinder and head kit. All the other mods are just the icing on the top.

Many aftermarket variators will give a small performance boost - Malossi, Polini, J.Costa, etc. Just fitting slightly lighter rollers might help. Exhausts like Akrapovic are mainly installed for looks and sound, but also give a small boost.

It all depends on the size of your bank account.

I own two GTS300s, and have fittied the Malossi V4 cylinder and head to both of them. My scooters now regularly do small wheelies when I take off. Plenty of power for overtakling at 100 kph plus.

Mike
Member
GTS
Joined: 19 Aug 2020
Posts: 15
Location: Berlin Germany
Thu Jan 21, 2021 2:21 am quote
Probably the most detailed information on GTS 300 tuning, but in German language - you might use google translate:

https://vespaforum.de/viewtopic.php?f=17&t=29477

But even only the pics and dyno results are impressive. Long story short, it is possible to almost double the whp and get into a 7s 0-100kph range.

Agree with Mike, cylinderhead is the key to real increase of hp. Malossi V4 or HPE.
Hooked
2012 GTS 300 Super (Charlene) 1832cc cruiser (The Lambo)
Joined: 16 Dec 2020
Posts: 107
Location: Tigard, OR
Thu Jan 21, 2021 8:15 pm quote
Mike Holland wrote:
The only real performance mod for the 300 is a Malossi cylinder and head kit. All the other mods are just the icing on the top.

Many aftermarket variators will give a small performance boost - Malossi, Polini, J.Costa, etc. Just fitting slightly lighter rollers might help. Exhausts like Akrapovic are mainly installed for looks and sound, but also give a small boost.

It all depends on the size of your bank account.

I own two GTS300s, and have fittied the Malossi V4 cylinder and head to both of them. My scooters now regularly do small wheelies when I take off. Plenty of power for overtakling at 100 kph plus.

Mike
Thanks Mike. What you say makes a lot of sense. So, for about $1,000 (USD) I can pop wheelies? Hmmm...if I do the install myself. Iíve been married for 37 years so I know how to follow instructions but that may be more than I want to take on. Wonder how many hours a qualified shop would charge for the head and cylinder kit install.
Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
Joined: 01 Nov 2005
Posts: 2823
Location: Sydney, Australia
Thu Jan 21, 2021 10:44 pm quote
I have a back patio where I work on the scooter, and a pretty good workshop in a shed nearby. I am an old codger of 82, and don't tackle this sort of job anymore. But I have done it about four time in the past, and usually spend one day getting the engine out and onto the workbench, one day doing the engine work and one day putting it all together again. Biggest nuisance is draining all the fluids and disconnecting all those hoses.
Hooked
2012 GTS 300 Super (Charlene) 1832cc cruiser (The Lambo)
Joined: 16 Dec 2020
Posts: 107
Location: Tigard, OR
Fri Jan 22, 2021 7:12 pm quote
If I decide to do the job it will take me a week because I suffer from CRS and will have to take photos and log each step so I can get it all back together.
Hooked
2009 Vespa GTS300 S
Joined: 28 Nov 2017
Posts: 245
Location: Christchurch, New Zealand
Sun Jan 24, 2021 6:37 pm quote
J Costa variator, custom Unifilter air filter and Mike Hollands airbox mod make the GTS a weapon in the traffic. Many a V8 has been humiliated as the traffic light goes green.
Hooked
2012 GTS 300 Super (Charlene) 1832cc cruiser (The Lambo)
Joined: 16 Dec 2020
Posts: 107
Location: Tigard, OR
Sun Jan 24, 2021 7:15 pm quote
Details my good man...details?
Member
Vespa Granturismo 200L
Joined: 08 Feb 2021
Posts: 6
Location: Western North Carolina
Thu Feb 11, 2021 5:59 am quote
Iíd love to read about your progress on this endeavor. Keep us posted.
Hooked
2009 Vespa GTS300 S
Joined: 28 Nov 2017
Posts: 245
Location: Christchurch, New Zealand
Thu Feb 11, 2021 11:56 am quote
PapaWheelie wrote:
Details my good man...details?
J Costa variator - excellent for quick get aways as it keeps the engine in the max torque band. I have lifted the front wheel when I don't remember to move forward during take offs.
https://www.sip-scootershop.com/en/product/variator-jcosta-pro_JC624FS0

Airbox mod thanks to Mike Holland - the guru of GTS300 performance

Air Filter mod - picture and measurements added.

Uni Filter BF1 foam, cut your own filter using OEM as the template.

https://unifilter.com/online-catalog/accessories/

Makes the GTS a weapon in the traffic and even for 700 km days at 100-110 kph in the Southern Alps of NZ. Many a Ducati has seen the GTS in it's rear view mirrors in the twisties.
Member
Gts,mp3
Joined: 11 Feb 2021
Posts: 9
Location: Peterborough
Fri Feb 12, 2021 8:51 am quote
Hi being in a scooter club here in the UK and most of us have gts 300s l have found that some are faster than others from the crate. We all pull away with the throttle to the stop but as we get to certain speeds some pull away ahead. A friend spent alot of money having his set up on a dyno and variator changed but still not as quick as some other standard ones. BUT you dont buy a scooter for top speed. Its a small price to pay for looking cool
Hooked
2012 GTS 300 Super (Charlene) 1832cc cruiser (The Lambo)
Joined: 16 Dec 2020
Posts: 107
Location: Tigard, OR
Fri Feb 12, 2021 8:46 pm quote
Karl S wrote:
Hi being in a scooter club here in the UK and most of us have gts 300s l have found that some are faster than others from the crate. We all pull away with the throttle to the stop but as we get to certain speeds some pull away ahead. A friend spent alot of money having his set up on a dyno and variator changed but still not as quick as some other standard ones. BUT you dont buy a scooter for top speed. Its a small price to pay for looking cool
Very interesting. For me....Iím beginning to think ergonomics and smoothness will be my best friends and not faster off the line or top speed increase. If I want that Iíll just ride my motorcycle. Thanks for the input. FYI, on a recent ride I got my GTS 300 Super up to 86 MPH indicated. Iím going to check that against a GPS to see what I get. Donít believe the previous owner modified the drivetrain.
Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
Joined: 01 Nov 2005
Posts: 2823
Location: Sydney, Australia
Fri Feb 12, 2021 9:18 pm quote
Don't just think performance mods. There is a lot you can do to improve the ride and handling, like a Bitubo front shock, better brake callipers, bar end weights, etc.
Molto Verboso
Gina, 1965 Vespa 180SS, Bella,1968 Vespa 150 Super, Francesca, 2006 Vespa LX150, Sofia, 2007 Vespa GT200, Gabriella, 2017 GTS300 ABS
Joined: 21 Jan 2015
Posts: 1389
Location: Hamilton/Kirikiriroa, NZ
Fri Feb 12, 2021 11:01 pm quote
On a recent trip my unmodified 300GTS ABS recorded 123.6kmh on the GPS, that's 77mph. It was indicating a bit over 130kmh, but we all know that our speedos are ego boosters for us.
Veni, Vidi, Posti
300CC Italian scooter (RIP), 750CC Russian Sidecar,1650CC Bavarian ADV Tourer.
Joined: 21 May 2017
Posts: 8042
Location: The Six
Sat Feb 13, 2021 6:23 am quote
I have the J Costa variator, the full Malossi kit and bitubo shocks which help in handling. One thing that hasn't been mentioned I believe is the Force Master 2 which should be considered.

2017 GTV and the upgrades are noticeable. Not as fast as my BMW but more fun to ride in many ways.
Hooked
2016 GTV 300 ABS
Joined: 14 Feb 2010
Posts: 235
Location: Andrews, TX
Sat Feb 13, 2021 7:53 am quote
I had the complete Malossi kit installed last year, and I'm very pleased. Overall it has a higher top speed and quicker acceleration. I can cruise the highway at 75 mph true (not indicated) without being WOT. It was already a quick machine off the line, but now it's REALLY quick.

I'm enjoying the added performance. Adds to the fun for me.

17FF86C5-A36A-4B52-B5B7-841FD6815A2E.jpeg

Veni, Vidi, Posti
300CC Italian scooter (RIP), 750CC Russian Sidecar,1650CC Bavarian ADV Tourer.
Joined: 21 May 2017
Posts: 8042
Location: The Six
Sat Feb 13, 2021 8:57 am quote
ETres wrote:
I had the complete Malossi kit installed last year, and I'm very pleased. Overall it has a higher top speed and quicker acceleration. I can cruise the highway at 75 mph true (not indicated) without being WOT. It was already a quick machine off the line, but now it's REALLY quick.

I'm enjoying the added performance. Adds to the fun for me.
The acceleration is nice but that also comes down to the variator and the force master if set to performance as well. It really is on the freeway it shows its true performance. I can ride along at 140 kmh and the scoot is happy with room left on the throttle for more.
Hooked
2016 GTV 300 ABS
Joined: 14 Feb 2010
Posts: 235
Location: Andrews, TX
Sat Feb 13, 2021 10:39 am quote
Harbinger wrote:
The acceleration is nice but that also comes down to the variator and the force master if set to performance as well. It really is on the freeway it shows its true performance. I can ride along at 140 kmh and the scoot is happy with room left on the throttle for more.
I haven't fiddled with the Forcemaster settings. I'm OK with its performance as is, plus I'm rather ignorant about the settings and nervous that I'd screw something up (I should do some studying!). The installer said he set everything "in the middle." As such, I could probably get more top-end speed.
Hooked
2012 GTS 300 Super (Charlene) 1832cc cruiser (The Lambo)
Joined: 16 Dec 2020
Posts: 107
Location: Tigard, OR
Sun Feb 14, 2021 8:12 am quote
ETres wrote:
I had the complete Malossi kit installed last year, and I'm very pleased. Overall it has a higher top speed and quicker acceleration. I can cruise the highway at 75 mph true (not indicated) without being WOT. It was already a quick machine off the line, but now it's REALLY quick.

I'm enjoying the added performance. Adds to the fun for me.
$3K installed? Just guessing
Hooked
2016 GTV 300 ABS
Joined: 14 Feb 2010
Posts: 235
Location: Andrews, TX
Sun Feb 14, 2021 9:10 am quote
Approx $2,400, if I recall correctly. Factoring in a 6-hour drive each way to the nearest shop (AF1), hotel stays, gas, and meals - yeah, probably $3,000.
Veni, Vidi, Posti
300CC Italian scooter (RIP), 750CC Russian Sidecar,1650CC Bavarian ADV Tourer.
Joined: 21 May 2017
Posts: 8042
Location: The Six
Sun Feb 14, 2021 11:48 am quote
ETres wrote:
Approx $2,400, if I recall correctly. Factoring in a 6-hour drive each way to the nearest shop (AF1), hotel stays, gas, and meals - yeah, probably $3,000.
Guess I'm lucky I can actually walk to my Vespa dealer . That price is inline with what I spent and TBH it was cheaper than I thought. Anything I've done to my other bikes make Vespa upgrades really seem like a bargain. The upgrades I've done to my Vespa are worth every penny and well worth it. Yes it's expensive when you factor in the cost of a new Vespa. The percentage of that cost the upgrades bite in to is large but you need to look past that.

This is true with most motorbikes though even more so with scooters. Do not expect to get any extra if/when you sell the scoot. Do the upgrades because you want it as it adds little value. A little ironic maybe as Vespas do see used for a pretty penny. You might find the right buyer but soon the HPE models will hit that market which also negates the upgrades on the earlier models somewhat. I have the last model GTV in portifino green and I may have hurt the value by modifying the scoot as much as I have. At least it's not a chop down...
Ossessionato
'20 300GTS Super Tec '09 250 GTSie '75 Rally 200 '79 P200 '09 Stella 221
Joined: 13 May 2012
Posts: 2582
Location: Midway, Kentucky
Sun Feb 21, 2021 3:35 pm quote
I have a '09 GTS and a new Super Tech. My GTS has all of the Malossi upgrades along with Malossi shocks F&R, Cluass Studio bushings, Brembo Brakes F&R, Polini variator and Akropovik Exhaust with SIP exhaust stub. I've seen triple digits indicated numerous times when drafting another vehicle on the motorway. It will run 80 easily and handles and stops incredibly. My new HPE pulls strong from the bottom and will run 85 mph flat out pretty easily. The older bike will run off and hide from it on the motorway. The Supertech has the speed ring upgrade installed, Brembos F&R, Akropovik exhaust and Pure Powers fitted like the older GTS. I noticed Malossi has released a new Forcemaster for the HPE, so I'll be ordering one tomorrow and fitting. This should raise the rev limit and be good for a little more speed. I've watched Mike Holland's posts over the years and concur with his results.
Ossessionato
'20 300GTS Super Tec '09 250 GTSie '75 Rally 200 '79 P200 '09 Stella 221
Joined: 13 May 2012
Posts: 2582
Location: Midway, Kentucky
Sun Mar 14, 2021 8:06 am quote
I received notice that the Forcemaster ordered from Scooterwest has shipped. Hoping to get my Super Tech down to the Ducati dealer for install and tuning. Installing good suspension upgrades to your GTS including shocks and bushings and upgrading your brakes and installing heavier bar weights won't make your bike any faster on top end, but will definitely make it quicker with regards to handling, acceleration and stopping and installing heavier bar ends make it more stable on the top. Tires are an inexpensive enhancement as well with regard to handling. I have ran the Michelin Pure Powers and Heidenau K56 with excellent results. Corning stability is greatly enhanced especially with the Heidenaus. They don't last as long, but considering the improvement, tires are one of the cheapest enhancement you can purchase. I prefer running the tires +5lbs as it seems to make the bike more stable at speed and turn in a bit quicker.
Hooked
300 super sport Full Malossi and carbon Edition
Joined: 26 Nov 2016
Posts: 149
Location: Netherlands
Thu Mar 18, 2021 12:34 pm quote
Almost 25 hp with the whole Malossi parts

776CB311-2625-4914-AF27-583699B31B90.jpeg

Hooked
2012 GTS 300 Super (Charlene) 1832cc cruiser (The Lambo)
Joined: 16 Dec 2020
Posts: 107
Location: Tigard, OR
Wed Mar 24, 2021 8:58 pm quote
335Rick wrote:
Almost 25 hp with the whole Malossi parts
Increase based on pre-mod vs post-mod done on a dyno?
Hooked
300 super sport Full Malossi and carbon Edition
Joined: 26 Nov 2016
Posts: 149
Location: Netherlands
Fri Mar 26, 2021 10:11 am quote
Without mods on the dyno just 17 bhp
24,5 bhp with mods
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