I have 1 winter and 2,500 miles on my T660ST and I'm very pleased with the performance, even stepping down from my 03 ZR800. The only disappointment that I have is the lack of top end. With the amount of torque it has coming up through the lower end I can't beleave there is no way of improving the top end. Has anyone made any proven mods to the top end speed ie:gearing. I am only getting 85-87 out of mine.

damn this thread better get some good info but i havent seen any thing about it on any other threads i wonder why none of the after market companies are tinkering with the 660

Posted this on arctic chat as well...

I'm wondering this also, if there is any mods out there for more top speed. I'm guessing a clutch mod would help out alot for top speed and gearing of course. I know the sled had the torque but lacks alittle hp but basically it should be able to run side by side with an F6 if set up right. F6 has little more Hp but less torque.

Anyone have any ideas?

My idea is...

1.. A blow off valve..mainly because they sounds sweeeeet. pissssssss pisssssss after you let off the gas

2.. Boast controller, but only if the fuel mapping can be adjusted.

3.. Piggy back computer to adjust fuel mapping and boast ...FMU for fuel is the cheap way

4..BORE and STROKE the motor

5.. Port and polish, balance etc

6..Put a larger turbo on yes this is CRAP for lag and I would only mod stock turbo by making it spool up faster but it will give you more HP

7...Turbo manifold this adds HUGE in spool time and will help over all HP and torque with out $$$ or any ill effect on the motor

8.. exhaust minor but will help of course.

9... hmm put a Hayabusa motor in it and boost it... should be good for 320hp+


sorry only have 9 ways not in any order....But has anyone done any of these?? I'm still waiting for my 06 and don't plan on doing any mods because it has the 4 year warrenty but I might be tempted hehe

someon makes a chip for them I think D&D but not for sure i for get it was last yr when i heard about it supposed to make good power

If they chip it I'm sure there cahnging the fuel/timming/boost thing is that motor run HIGH boost to start with. 18psi I think I was told, thats not very efficent so not sure if they will last if there just increasing the boost and fuel timming to match. I'll have to look into it. Didn't see anything on d&D website

Can a PAC or fuel restrictor system be installed on a 4-stroke eFi just as it can be on a 2 stroke?

Contact Billy "007" Howard for some T660 speed upgrades.

:banghead:
called billy.he studdred an himhayed,finaly said he would pull his notes.never heard from him.soo much for 007. :banghead:

hmm, well if mine was not under warrenty and well the fact that I don't even have it yet, I would try a few things.

Does the sled have an o2 sensor? If not it does then one minor thing we can do is hook up a wide band o2 there about $400 US with digital read out. And then hook up a piggy back fuel and boost controller like what Apex'i has. I actually have one for my car put it doesn't control boost thats the problem. :frech32:

maybe black magic

Someone better come up with something fast or I'll be riding a FST Touring

Lots of mods available since that engine is used in car application in Japan and Europe. You can have that engine bored to 698cc and have it produce up to 230 bhp with turbo and nitro. I'm in discussion with a company to have those parts adapted to our snowmobile configuration. I'm expecting to have my engine produce 135-140 hp without boring it. i'll give more info soon.

That Capucino is some rice cooker. Too bad they don't sell them in the US.

Talked to my dealer today, and he showed me the new speedwerx catalog. Guess what one page dedicated to the 660 it states call for info but they list exaust mods, fuel control, cams, heads, clutching ect.
By the way this isn't BS :div20:

is there a website im doing searches but but one cam up as just motorcycles and another was go carts

doesn't show up on web sight But if go to your dealer you can see for yourself. Maybe that outdoor shop guy can veryify or help with some info I saw they carry speedwerx stuff on that sight

Here is the web sit http://www.hotseatperformance.com/

You just gave me the best news I've heard.Now I have some thing to look forward to. :div20:

checked in with the dealer today speedwerx is draggin their frickin feet on this nothing is ready yet call back in Jan. looks like by the time they get there act together we will all have the new 160 HP twin turbo. What's the deal :banghead:

thats probably what they think also so they said screw it

hahahah!!!!! Black Tragic!!!!

Installed a TurboXS manual boost controller, along with an a/f ratio guage and a boost guage. Also installed the "performance chip" sold by Howards Inc. Here's what I've found so far:

Autometer guages have condensation in them after 1 day. :banghead:

Stock boost ran up to 20 lbs WOT. After installing the boost controller on the initial setting, I hit 23 lbs boost at 1/2 throttle, zero lag. The boost is there as soon as you hit the throttle. Problem is, the sled has an electronic boost sensor that kills the fuel supply when you hit 23 lbs...I adjusted the boost controller to max me at 23 lbs at WOT until I can install a "fuel-cut defender" Then we'll see what #'s this thing will hit. A/F ratio seems OK so far, and the plugs looked good so hopefully the fuel system can support the increased boost. This thing is a whole different animal off the line now... :banana:

I installed the so-called "performance chip" before messing with the boost, and felt no "seat-of-the-pants" increase in power...I say don't bother spending the $100 on a chip that they won't even tell you what it's supposed to do...It is a genuine Suzuki part, and gets installed in the fuse box (shows aas a resistor) If anyone has any insight on what this thing should do, please chime in...

That's awsome please keep us updated on your progress :beer:
After just shelling out that much cash on the sleds it's hard to experiment like that at least for me anyway. Keep up the good work :div20:
Mr. Freeze

when you do the timing of the motor,you use these chips to up the timing or decrease the timing to spec.chips run from 0 to 10.exmp.if yur timing is at 4 add chip #2 to get 6degrees of advance.keeps you from going back into the motor to time no performance gain here.keep up the good work.anybody use an eboost2.might be the ticket?

That chip was touted on here to be a 10 mph gain by someone, after speaking with Billy (007) Howard he says it was more like 2 mph.

This is my first post on this forum so go easy on me :lol2:
Just wanted to share what info i have on the T660.
At the begining of last year i put together a simple performance package similar to what we do for automotive turbo cars. It made good HP right out of the box but needed clutch work and gearing changes, bad. I had limited tech support from two of the big aftermarket companys on this project. By that i mean we shared info. One company has a modded ECU from Arctic Cat but can't get them to agree to duplicate it. That would be the best route to go as far as tuning goes. But since that doesn't look like it's going to happen we have been getting extra fuel the old fashion way.
Here is the combo i ran most of last season.
#1 Boostvalve.com's manual boost controller w/high boost spring @25 psi
#2 Adjustable fuel presure regulator (Automotive Type)
#3 A dollars worth of diodes and resistors on the Map sensor to eliminate the overboost protection in the ECU. I chose not to slew the whole map with just a resistor, i capped the Map voltage at 3.6V, that = about 20 PSI. The signal volts will never be able to go over 3.6V, everything below that is as if never touched.
#4 Boost gauge and Air Fuel gauge (These are a must)
#5 This is also key to making this work. More weight in the primary. I am spinning 77 grams now and could use more.
6# Gearing, not sure if this is a must but i spend alot of time on the lake so i went for it. You are limited if you want to keep the reverse, that's what i did. Due to chain lenth i couldn't get 1 more tooth on the stock chain, with the next longer chain i had to add 3 teeth to the top to get it to work. It pulls it fine.
This combo @25 psi is about 135 HP. This engine can make much more, 200HP is doable without bottom end work. I have about 30 1/4 mile passes @ 30 psi of boost this year. On Racing fuel.
Another problem i have run into is that much over stock HP the track wants to ratchet. I am still working on that, may add 2 more drive wheels like the long tracks use.
It looks like D&D is not going to continue there 660 program because of low interest and Arctic Cat / ECU deal.
The guys over at Hotseat are working on it hard.
Sorry for such a long post
Remember, try at your own risk. If it's modded and blows up, it's your fault for doing !!!!! :banghead:

Look under TURBO/fyrtaktare

160hp kit!

Bengans

Good stuff Turbomania, thanks for sharing! :beerchug:

Is there a fuel pressure reg that you recommend? What pressure range of adjustment?

I think I understand how the fuel-cut defense works, but I'm not that handy at wiring. There seems to be quite a few on the market, but they aren't cheap...

I used a universal 80 psi billet regulator. It's a little big for the job but it's what I had.
I am sure someone can come up with a smaller adjustable regulator.
The OE regulator is mounted to the end of the fuel rail. Most aftermarket regulators have to be mounted remote, to do that I had to make up an o-ring type fitting for the fuel rail end. I will try to round up some pics.
I will have to find my notes on the fuel pressure numbers. I think it was about 8 psi more than stock. I'll have the gauge back on it soon; I am working on a high boost setup. Just need to finish the clutching and fix the track ratchet problem.
As far as the fuel-cut goes there is only one wire to tap into on the MAP circuit. One end goes to MAP (boost) sensor SIGNAL volts; the other end goes to ground.
We are getting ready to do a friends Turbo Touring, I will try to make up a few extra fuel-cut eliminators if there is any interest????

Turbomania,

I am definately interested in one of those fuel-cut eliminators, and any pics of the regulator setup you could post would be appreciated! :banana:

Thank you for the info turbomania. Is your FCD utilize an active clamp? That mean the signal from the MAP sensor is not modified until it reach the voltage set by the ECU to cut fuel delivery. Just before that voltage is reached, the FCD lower the signal from the MAP sensor to prevent fuel cut. Thank you!

Hey Turbomania,

Have you (or anyone else feel free to respond) modded the intake or exhaust yet? I've been waiting to see what speedwerx comes out with...

[QUOTE]Thank you for the info turbomania. Is your FCD utilize an active clamp? That mean the signal from the MAP sensor is not modified until it reach the voltage set by the ECU to cut fuel delivery. Just before that voltage is reached, the FCD lower the signal from the MAP sensor to prevent fuel cut. Thank you!

Yes that is how it works. The voltage curve from 0 to 3.6V stays as stock, @ 20 psi of boost or 3.6 volts the circuit is now active and wont allow the Map signal to go over 3.6 volts. It's a Zeiner Diode and a Resistor in series.

No exhaust mods yet, I do plan on trying a different muffler or no muffler for the lake. I would like to have it so i can put the stock can back on quickly for trail riding.
Not sure about the intake. I have seen very little gain on turbo automotive applications as far as intake mods go. There are a few exceptions to that but most are a waste of time.

Have any of you ever listened (off the sled) to the exhaust at max boost. It sounds soo restricted. My first mod after i strap the a/f gauge into it is going to be a straight pipe. I'm going to get one made up with the proper donut flange so it can be replaced. I'm thinking I might have to add some fuel after opening it up though. Sounds like it'll be flowing quite a bit more air.

That was my first assumption on the lack of top end.

I emailed Livingston's Arctic Cat (home of the 287hp turbo) but got no reply, too bad, i would have really liked to see under that hood

has anybody noticed the extremely weird way they grabbed boost off the turbo for the wastegate. no wonder it spools so much faster with a controller.

Pics soon, sorry for the delay. It was a busy weekend tuning on a RX-1 Turbo.
Joe

:beerchug:

Here are a few pics of my boost valve and pressure regulator.
The regulator is an Aeromotive A1000 (Jegs #027-13109) $134.95
The boost valve is from Boostvalve.com $39.00 and $5.00 for a high boost spring.
I have used Ric's valve's on several different projects, they are very simple but work very well.
Joe
PS
I reduced the size of the pics for faster download, if you would like the full size pic or from a different angle let me know and i will e-mail it to you.
tdibug@chartermi.net

Thanks for the pics and info Turbomania. Please keep me in mind, I would like to buy one of the fuel cut defenders if you make some more up.

:celebrating:

Hi all,

was busy on the river today after mounting the boost, air/fuel gauges

first thing i did was get a base reference on the a/f gauge
then i pulled out the muffler and put the straight pipe i got made up in

sounds fricken cool man, the turbo muffles it quite a bit so its not too loud, and its not as annoying as a mosquito 2 stroke with stingers. alot deeper with a nice whistle to go with it

on the downside i had to pull it off because it went WAY lean, i mean detonation lean!! started at about 5 psi so i let off...

just goes to show how restrictive that stock muffler really is, the bad news is you can't replace it without adding fuel, the good news is that if you do add fuel its gonna make a world of difference.

on went the stock can, check the plugs, no damage :banana:

second thing i did was put a manual boost controller on, just a simple one temporarily.

WOW

that extra 4 psi or so really woke it up, it doesn't fall on it's face anymore at 80mph it keeps pulling to about 90. floats the skis at about 70. muchos cool!!

need to order one from boostvalve.com so it'll spool faster and hold the boost accurately

TURBOMANIA:is your regulator rising rate? nice adapter plate, did you cut up a regulator or something?

I would like the skinny on how you made the adapter too please

A link for a DIY FCD

teamfc3s

[QUOTE]TURBOMANIA:is your regulator rising rate? nice adapter plate, did you cut up a regulator or something?

Yes the regulator is rising rate, 1 to 1.
I made the adapter from a stainless #4 AN fitting. I machined the pipe thread end down to match the OE regulator. I'll post a pic of it off the sled.

High PSI
What type of A/F gauge are you running? What did you use for the ball flange on your muffler eliminator? I am going to make one up soon.
Joe

turbomania:
i had a straight pipe made up for me at a local performance exhaust shop, he has a bender with a flange maker, took the sled to him, minus intercooler, so he could test fit the pipe and donut and get it to exit just right. then i took it to my shop to weld the spring hooks at the flange and also further down to mimic how the muffler sits.

i'm using a cyberdyne, same one i was using in my turbo dodges. but for some reason its finicky on what it sees. i've got a .4v voltage drop across the ground i'm using so i think i'm going to run the wires straight to the battery instead of the power plug under the speedo.

i'm not intalling an fcd just yet, consdering the possibilities for extra fuel for the muffler eliminator, i think the factory injectors might be a touch small. i'm considering a 4th injector but am worried about possibly starving #1 cyl.

Sorry for any confusion, i gave out the wrong voltage for the FCD. It should be 4.3 Volts not 3.6 V. I am going to be doing that Turbo Touring install next week. I will make up a few extra FCD's.
Joe

:banana:

BUMP


doesn't anybody have anymore mod projects on the go??

I keep checking back here every day looking for some new info. I'm still stuck trying to get around the fuel cut out at 23lbs+. Waiting on my fuel press. regulator to come in, and hoping to hear from Turbomania regarding the cut-out defenders he was working on... :beerchug:

We went from 2 feet plus down to 6-10 inches over last week, so I guess I'm in no hurry... :banghead:

Ammoeater
I am still out hear, I only had enough parts to build 1 FCD. The electronic store i use has been closed for the holidays. I will stop by there tomorrow and restock.
We lost all of our snow I have been trying to get all of my clutch jobs tuned before all the snow melted. I didn't make it.
Joe

Hey, no hurry. I really appreciate you keeping me in mind. Don't go out of your way, like I said the conditions stink anyway! :beerchug: