Ducati Monster Forum

Currently I have a lighten fly wheel, DP kit with sps cams, and a power commander. I'm wanting to upgrade my S4's power but not sure what to do next. I'm leaning towards HP pistons or a 955/984 kit.

Other thoughts are a slipper clutch, speedymoto full triple set, or a damper. Would love to do the wheels but that's too much $ for now :(.

Or hell should I just stop dropping $$ into the S4 sale it and get a Street Fighter?

Thoughts?

Id drop the S4 for a Street Fighter if money permits,  Or to a S4Rs.

Wheels are the best bang for the buck.  [thumbsup]

Performance upgrade?  Gixxer thou!!

>:(

-1

I am reporting this to the moderator...

What's the next best option to BST wheels?

I've done most all the upgrades you can on a s4. 
Best is BSTs
Other good ones are slipper clutch, light rotors, suspension (ohlins/penske), 1080 motor.

It's cheaper to buy a new bike but not necessarily as satisfying. 
Ask yourself is this a bike you are going to keep or a stepping stone.  Why upgrade a bike that you are only going to sell/trade (upgrades get pennies on the dollar at sell time). 

BTW upgrades aren't cheap I could have had another bike or 2 if I stayed stock.

 [cheeky]

why stop there, why not at the lucky 13?

I can get the BSTs for 3500 shipped...is it really that noticeable of a  difference?

Where I am really torn is with the Street Fighter. I'm waiting on a response to see how much I can get for a trade in with my S4. It's my first street bike and I've owned it for bout 4 years now. That's the only bike I'd be willing to part with my bike for...

They want to give me $2500 for a trade in...I'm keeping the S4.

i betcha theyll sell it for like $6,000! lol

trade ins are always under bidded, im sure you can sell the S4 for around $5,000.

I agree with He-Man.  When i was talking about upgrading to the 1098 i wanted to trade in my 695 and they only offerred me $4000 and told me how great it is because it is non taxable.  Well i sold it privately for over $6000.

955 isn't much of a bump in displacement for the cost involved.
984, that's a '955' with a 900 crank (68mm), right?

I've got a DS1k crank that I want to fit into my S4, that'll be a 992... pending money and time to tear it all down....

I've got a set of cast magnesium Marchesinis on mine, definitely better than the OEM 5-spokers, not as good as BSTs tho.

Suspension upgrades are always money well spent IMO.

What's the best route as far as upping the displacement?

As for the wheels are Dymag carbon/magnesium good wheels? I love the look 3 spoke red mags. Aren't they a little less price than the BSTs?

Why put a 1000 crank in a 916 when you can get a 996 s4r/st4s motor for 1k then put the crank in it.  Plus with the right parts you'll out pull a streetfighter. 

Wheels are the best upgrade.  Buy the lightest you can afford. 

Ignorant question, but I've only been around my bike for a few years...is the ST4S the same as the S4R? I saw a S4R on ebay for 999 today. How much is involved with the transfer?

Out pulling a street fighter I don't get would be too big an issue on the track with the right mods. But that damn thing is sexy as hell! Plus with a few mods on it. Look out!!!

What are you looking for straight line speed, more corner speed, or a balanced package?

If you looking for more power, get an ST4S ($1-2,500.00) motor and transfer your cams, flywheel, and PC3 over (labor rate). Get some high comp pistons ($500.00) and head work ($2-3,500.00), this would put you in the 120rwhp range.

You'll need to upgrade the stock suspension with that much power.

+1 on whats already been said.

 

Hell I thought I was around 117 as is right now...Can't I get 120+ with  HC pistons?

So to install the 996 I'm looking at around 5k or more?

Hmmm, well, I hadn't thought of that.  ;D

For the OP, depends on how much $ he's willing to spend.

Additional detail, S4 has the close ratio trans in it.
ST4, S4R, ST4s have the wide ratio trans.

Your bike stock was more than likely putting down just under 100rwhp, your mods probably added another 8-10rwhp. Here is a dyno comparison of my stock S4 and then with a built ST4S motor:

(http://i29.photobucket.com/albums/c271/billybongthorten/Foggydyno.jpg)

Yes, it's a chunk of change when you get into motor build ups.


I would get the street fighter or do wheel/suspension work, before I would spend money on the motor. My bike was a handful before I upgraded the suspension and brakes.

Close ratio is less of an issue when you have over 80 ft/lbs of torque from 3500-8000 rpms. 

Still have to fit dual injectors to maximize the top end. 
Dyno'd on superflow see below

(http://www.desmonorthwest.com/photopost/uploads/2685/1080vs10981.jpg)

Eh, kinda what I was meaning.
Even my virtually stock S4 has no trouble with the gaps on the street.

I've got a wide-ratio box waiting to go in with the crank.  :)

What's the black curve?

YES!

Rick,

What were the issues you were having a while back and how did you correct them?

Is the black line the first tune on the new motor?

How did you go from 120 to 141hp (is that all tune)?

Thanks for all of the great advice! I have a much better idea on the route to take. I am looking into a couple of options for wheels.  [thumbsup]

(Edit) How much do my stock wheels weigh? I see a lot of places calling them "super light weight"

My graph is my curve vs. 1098.  Mine is black and is kicking a$$ until fuel injectors max out.   [bang]  I've got some dual injectors that I'm going to have fitted in the hopes to get the top end situated.  Should pull the 1098/streetfighter to 9500 RPM after that. 

@ foggy123, what are your engine mods?

Pretty simple-
996 st4s motor (now 1080)
1000 crank (balanced for rods/pistons)
916 MBP red heads
506 cams
Lightened flywheel
Motowheels slipper
K&N pod filters
Stock FI  :P
Power commander dual map (individual cylinders)
Compression just under 13:1 so Premium gas.

How did you deal with the piston height at TDC due to the longer crank?

Cylinders were shimmed up with base gaskets. 
Bigger problem was using a 916 heads on 996.  New holes and smaller CC had to be opened up.

Bruce Myers did the build. 

OK, a base gasket 'shim' was what I was going to do.

I'll have to deal with belt length somehow.

Do you mean 916 SBK heads or 916 S4 heads?

ug both those dynos are straight sex.  [evil]

916 s4 heads were used.  stm adjustable pulleys.
Another thing is belt covers won't work the same way so not running them.

Cool, thanks for the info.  [beer]

Ordered a set of BST. Should see them next week!

Ran across this a few minutes ago.

http://www.virdung.net/S4mainpage.html (http://www.virdung.net/S4mainpage.html)

Is this one of you guys?

Nice, stil lthe C.A.D. I see! I can't wait to get some side cash for more building!

:) thank bud

Couple of questions.

What size frame plugs work on our bikes? I've been looking at them for a minute now and think some red ones would really add to my bike. Also what do you do to lower the dash?

Knock on the door BSTs have arrived! Will post pics soon. Now I'm really hating my clutch lever mishap...

(http://i96.photobucket.com/albums/l184/tonkoshala/08202009486.jpg)

Finally got them installed! Nothing comes easy  8)

Man oh man. I'm needing a ride on that bike in a hurry. For more go-fast motor ideas, try picking the brains of the MBP guys, or Ducshop in Atlanta. They do go fast stuff. OR give your bike to me, and i will ride the buisiness right out of it, and at least ONE of us will be quite thrilled with the experience.

i'd say, you have reached zenith  [evil]