Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Fraca]

Hi All,

I have been following with interest a lot posts on the subject of engine mods and still can't decide what is going to be right combination for my bike and riding style.

Firstly in all my other bikes I've always gone with theory bigger is better but have come to relise that this always comes at a cost on the other side of the scale. This time however I would like to be somewhat subtle in my approach at increasing the overall performance of my 2015 CVO Street Glide.

Secondly I mostly ride one up and I weigh a spritely 240 pounds and when I do double my wife she adds another 110 pounds to the equation.

Most of my rides include a combination of mountain switchbacks as well as open throttle freeway running. I also do a bit of commuter transport in the city traffic.

My aim is;

To increase torque across the rev range without it falling off sharply as it feels to do now at approximately 4000 RPM point with the standard 255 cam.

Keep the engine temp at reasonable degree.

Maintain ease of starting.

Not open a fresh engine to increase cubic capacity.

The engine is currently fitted with a SE Race Tuner base map. And I have run a set Vance Hines dresser duals coupled to a set of 4" monster rounds. I have just ordered a set of Vance Hines power duals and am going to bin the dresser duals as they just don't work where torque is concerned on a stock 110.

The only mod at this stage I'm looking at within 12 months once the warranty runs out is a change
 of Cam and some dyno time to get it running sweet.

The Cam I'm looking at would be something like the SE-585 or SE-259E given I won't be changing the comp ratio.

Does anyone run one of these combos and if so do you have any verified dyno stats? Or should I be looking at something from S&S, Andrews, Woods Etc?

Another thing I'm interested in is and without removing the heads and porting or re-valve sizing, is there any other effective mod's that can be made to the intake system that will give any tangible gains?

Thanks Glenn.

[Para Bellum]

Glenn,

As you know, the 255 cam is designed for low-end torque, roughly 2000 rpm to 4200 rpm.  Unfortunately, the dresser duals and monster rounds are designed more for high-rpm horsepower, so this combination of cam and exhaust system is hurting you at both low and high rpm.  If you switch to a header and muffler combo that is designed for maximizing low-end, the cam and bike can perform as designed, and while it won't be an all-out rocket, it will run pretty well.  Of course, to maximize that, you'll need a real tune.

I'm going to assume (cough) you have the equivalent of the U.S. Screamin' Eagle Street
Tuner (SEST), which basically just allows you to use MoCo's canned downloads--which aren't a real tune.  They are just "one-size-fits-none" generic maps that might be better than the stock map for non-stock exhaust systems.  The only benefit IMO to the SEST and its downloads is that the dealer can charge you for a full dyno tune without providing one investing in a trained dyno tuner technician--and usually keep the bike street legal for emissions.

I have nothing against cam swaps, and have done them on about 2/3 of my bikes, but a compatible exhaust system for the 255, plus a real tune by a knowledgeable technician, might get you what you want.

[Fraca]

Thanks for your reply, the headers I have were not my first choice and ended up with them quiet by accident, one thing I will say they do sound good though and a quiet a few other riders have commented but they just don't work.

I have ridden another 2015 SG with a 2-1-2 exhaust and the difference is chalk and cheese compared to mine.

It's funny how the dealers try and talk up the SE tuner, let me say for anyone thinking of installing duals the SE tuner seems to do nothing as engines coughs like an 80yo smoker first thing and backfires n pops like a wet firecracker when you back off, buyer beware is all I can say.

[GMR-PERFORMANCE]

great tune would work wonders on that stock set up

[Cat Eye]

I had a 2010 Limited with a 117, SE259 cam and the Drago 2 into 1 exhaust and it ran great...did the engine built at 40K then during the next 46K miles burned up two clutches, rebuilt the tranny once and replaced the compensator twice...

Now I got a 2015 SG stock with Fullsac headers/baffles 2.25/TTS with Fullsac map.....and this bike runs much better.  Cooler, quicker and better mpg.

From your description I ride a lot like you.....and as for the 255 cam I know the dyno sheets show the torque falling off over 4K.....but at 4K rpm in 5th gear I think is around 85 mph.....I seem to always shift around 3800 rpm when I want to...as Ricky Bobby would say "Go Fast".

As for being a production heavy bagger with just the fullsac upgrades.....I hope this bike in the sweet spot with respects to HP, torque and powertrain...time will tell  10k miles so far and all good

[Jbbrown73]

I had a Kury 24D installed on my 2015 wet head CVO Road Glide. From what I'm reading below you were looking for exactly what I was. I am running the TTS Mastertune, the Kury 24D, adjustable push rods, lifters (I forget what Jason installed, but they're good ones), Fullsac head pipe and Fullsac 1.75" cores in the stock mufflers. It was tuned and come in at 103/113. Jason was a little disappointed with the numbers, but was sure it was due to the quieter, more restrictive muffler cores. The butt dyno was not disappointing at all. It definitely helped the torque curve across the rpm range and the bike performs great! The work was performed by Jason at C&S in metro East St. Louis. He's a member here on the forum.

[bakon]

You sound like a 255 rider in my opinion. Without an increase in compression there isn't another cam for mountains and two up. Highway is usually just gliding down the road once you merge. Passing is just a downshift if you want to roll.
You named your problem- it's the head pipe. The one you are changing to is a good one for the 110 and 255 cam.

[hrchdog]

Check out the GMR 577 from GMR Performance. Jason at C&S Speed Shop installed them in mine yesterday and is dyno tuning it now. Bike has Full Sac DX pipe and 2" crossover with 2" cores in the stock cans and TTS Mastertune.

[FlaHeatWave]

The 259s like more compression at 110".
The powerduals are a good pipe for a lot of different combinations, you might just put them on and Tune it, and see if that combination works for you... the power duals will work well with just about any bagger cam out there, a pipe that you can grow with, if you decide you want a different cam or whatever...

[Scott7d]

I have a fairly common stage 1 setup. Fullsac DX and Kuryakyn Crushers along with the stock 255's. I've got a minimum of 100 TQ from 2300 to 5100RPM. Not a drag bike by any means, but the 255's can stretch past 4000RPM with the right goods and a solid tune.

[1roadking]

I'm pulling 100hp and 111 TQ with a bone stock 110. I have Vance and Hines power duals and OS 450 slip-ons with a SE race tuner and a real Dyno done. It pulls great from just over idle to 5500rpm.

[Pan1]

Likewise I have 2015 RG and with a good Dyno Tune the bike is100hp and 115 TQ. It pulls strong to about 5,500rpm.
DX pipe and D&D 4" mufflers.

Had a CVO with 10 1/2 comp Pistons and 259 cam. Dyno numbers were a little disappointing 106hp and 110 TQ. Pulled stronger through mid range and top end 6,400 rpm but gave up torque and ride ability below 2,500 rpm. Spent a lot of money for just a little gain.

[Fullsac Performance]

great tune would work wonders on that stock set up

A good tune and a properly sized exhaust. Nothing wrong with the stock cam making a 100 ft pounds at 2250 and all in at 3000 RPM when your Touring.

SG

[DCFIREMANN]

If you are just looking for a quick cam change try the TC-24D with a good set of lifters and adjustable push rods. You will feel the difference.

Be Safe

THE DAWG
 

[snowrider13]

Went with a andrews 48 after a 17,000 mile "rebuild". Liked the 255 grunt so went with the 48. Seat of the pants sez very similar down low, with more carry-out over 5000 rpm. Full tune coming soon. Will see what the dyno sez.