Someone build this K.I.S.S rmk i just thought of

[adam8781]

Keep it simple stupid, Its how I like my sleds, murphys law will always make me lean towards KISS

Weird idea i had, I dont even have an rmk, but this would save alot of weight, simplify the 800cfi and be more reliable (far less can go wrong)


dmax makes these fuel injector block off plates for the current 800 cfi cylinders

http://www.dmax.ca/#!polaris-800iqr

The newest 600iqr uses the same bottom end as the 800 cfi, D max makes the block offs so you can take the cylinders and top end from a 800cfi and bolt them on a 600iqr race sled turning it into a iqr800

Instead of building a iq600 with 800cfi jugs. Do the opposite, Build the bottom end of your 800cfi to run on carbs. Take the ignition, 40mm carbs and gauge from a 600iqr or run 40-42mm lectron carbs. No more efi, or oil injection premix the fuel. I like the idea of lectrons, they work great in sleds. PAr uses them on there billet monster motors. it would last longer than the 800cfi with its efi and oil injection, Giving the motor a constant mix of finely atomized fuel/oil in through the bottom end would keep the bearings and topend very happy. And save a ton of weight getting rid of all the efi and oil injection system as well. (kiss my arse epa)

Its a dream sled, would have all the power of an 800, or big bore topend you bolt on 858,900,910 Lose alot of weight and make the sled more reliable in the process.

win win win. if i had the money its what i would build. But I am a huge fan of simple. It would be a dealy combo, lectron 42 carbs with a 858 topend on premix. Would be bullet proof and in the mid 170hp range.

Any takers lol? There would be fab work involed for the intake etc but since guys can kram a 1200wc triple in a pro i dont see it being an issue.

Someone build this!

 

[icr]

There's a carbed 1100 pro for sale in swapmeet, same idea but bigger budget.

 

[ak]

Similar

http://m.youtube.com/watch?v=_euM7AAQnEo

 

[xc6rider]

I disagree, the EFI creates the KISS for me...

 

[meathooker]

Does anyone know how much weight efi adds? I'd guess 5 lbs. Also many people would agree that pre-mix is harder on the bottom end outside bearings as oil doesn't have a direct path to them as it does with injection. I'm all about KISS but not on this one.

 

[mountainhorse]

Probably more weight... Fuel pump and flange assembly, injectors and rail, return line, ecu and sensors... I'd bet more like 8-10 lbs for injection.

I'd run the new smart carbs if you went that way.


.

 

[pura vida]

I've always heard EFI is a 10 lbs weight penalty. But I'd never go back to carbs. Sorry, the EFI is just too nice. I had both at the same time and not having to deal with a flooded sled again was enough for me to ditch the carbs for good.

PV

 

[TimG]

EFI Weight Loss

Brad from PAR claimed a few years ago on here that pulling the EFI and associated wiring got rid of 30 lbs. I don't know if he was including the oil injection in that, though. That would take a 155 Pro down to 387 lb. dry.

SmartCarbs would be awesome on something like this- no adjustment for altitude or temp, ever, and a minimum 5% power increase over a conventional carb. I talked to Corey from SmartCarb, and there are no vent lines coming off the carb, and they have an internal check valve system so that you could roll the sled over without flooding. But the biggest carb they have available right now is a 38mm.

 

[Danny Dangles]

I feel like hitting my head against the wall.

 

[likkerpig]

Carbs suck. Just sold my last carbed sled a few weeks ago, I'm never going back.

 

[Norway]

Carbs suck. Just sold my last carbed sled a few weeks ago, I'm never going back.

Yup, and tubos blow. Just physics.

Still have 44 Lectrons on my price triple 1029. A 800 twin go easily go 48 or even 50mm flatslide carbs. I did NOT tune a lot on those carbs. Guess if you unload at 5K and climb to 8-9-10, then you need to turn the power jets or click on your ATACC, but with a good finished port job with correct surface machining you can have a pretty broad range with carbs.

Seems for mod sleds a lot of people are messing a lot with different tunes and boxes. Might not be such a step backwards as you would think.

RS

 

[geo]

If modded, who doesn`t have a box to tune their EFI. If your mods needs different parameters than the factory program you have to buy a stand alone or trust someone elses program will meet your needs or deal with glitches.

Since EFI how many dollars have you spent on "boxes" trying to improve HP or match the mods lol. A bunch of film canisters of jets is less that one but you have to get in there.
Speaking of "getting in there", how many hours have you spent punching in #'s on the side of the trail, or redoing the program on a laptop, or using a voltmeter to check sensors or the "TPS switch".
A whole industry was created just to tune EFI so the demand is still there just more money now.

Carbs are more forgiving too. Float bowl pressure drops with elevation (leaning things out some), fuel delivered by demand (vacuum draws the fuel), less obstructive intake path, you can pick your own idle rpm lol and 40 to 1 in the bowls gets the oil everywhere at the correct ratio (including the first 4 or 5 secs of WFO).
For me EFI's biggest benefits has been throttle pull and large throttle bodies but EC Birt changed the need to size carbs with purely mid range velocity in mind back in the 70's.
Not every sled pours the gas in like a stuck 670 either lol.

I've been thinking about a KISS project since I fell in love with this chassis. It works awesome stock but I like to screw with things lol.
44's, IQR ignition with timing adjust on the bar, get rid of 75% of the wiring, get rid oil infection, adjustable ex valves, pipe it and tune it to run 7950 max and idle at 1200, make it clean under the hood and pay for most of it by selling off all my "boxes" lol.

Trouble has been and probably will be, the next model will be 390lbs., 29"'s of suspension, 3.9" track, more HP than can be legally advertised and a hood that can't be removed with out a factory, super secret, lap top thingy.
That's really what we all want eh!

 

[pus1100]

I have been tinkering on a kiss pro myself for quite a time.smart carb or lectrons.has anyone converted cfi2 to premix only?what was done to lubricating outer crankshaft bearrings and waterpump/oilpump cavity sucsessfully?would love to mod the engine without worry about fuel pressure,bad injectors,wiring and all the other crap with fuel injection

 

[adam8781]

SmartCarbs would be awesome on something like this- no adjustment for altitude or temp, ever, and a minimum 5% power increase over a conventional carb. I talked to Corey from SmartCarb, and there are no vent lines coming off the carb, and they have an internal check valve system so that you could roll the sled over without flooding. But the biggest carb they have available right now is a 38mm.

Smart carbs arent a real option i dont htink, only come in 38s and they have been a can of worms in the motocross industry, exact same technology as the letrons, but more money. They got a huge amount of pre-orders when they told people they were making a cast version. its been over a year and people still dont have there carbs, and alot of the guys that do arent to happy. The first runs were crap, now they have a new casting source. And they still send them out with the incorrect fuel rods etc. Its supposed tobe a cast version of the billet 38mm, yet they take a different fuel metering rod than the billet? Theres alot of bashing going on about these carbs over on thumpertalk.

Lectron is ready to ship now and flat out works. Brad uses 44s on his billet 1100s and i read somewhere it took a full season of tuning vipec toget even close to how good the motor ran with lectron 44s

Seems for mod sleds a lot of people are messing a lot with different tunes and boxes. Might not be such a step backwards as you would think.

RS

My thinking exactly

Does anyone know how much weight efi adds? I'd guess 5 lbs. Also many people would agree that pre-mix is harder on the bottom end outside bearings as oil doesn't have a direct path to them as it does with injection. I'm all about KISS but not on this one.

I cant see how, the 600iqr and 800cfi both use the same cases and crank. One is premix and one is not. the iqr600 has proven tobe a pretty reliable engine, no reason to think the premix oiling idea would be any different on the 800cfi than the iqrs since they are identical bottom ends

I have been tinkering on a kiss pro myself for quite a time.smart carb or lectrons.has anyone converted cfi2 to premix only?what was done to lubricating outer crankshaft bearrings and waterpump/oilpump cavity sucsessfully?would love to mod the engine without worry about fuel pressure,bad injectors,wiring and all the other crap with fuel injection

Smart carb wont work, lectrons would. Just look at the 600iqr on how its setup, would answer you questions



I hope someone does a kiss rmk, it would be a solid runner once tuned in. Instead of laptops, boxes, custom tunes. All you would need is AFR egts, use the adjustable powerjett on the top of the carbs to tune the afr for 12.5 when wide open (takes a few seconds to change) and if you need to play with bottom to mid you just have to take the top off the carb, spin the metering rod either direction in 1/4 turns to dial it in.


do itt

iqr600 bottom end
iqr ignition
iqr 40mm carbs (or 42 lectrons, Stock summit 800 is 40mm and big bore 800r with big bore carbs is 42mm) i think anything bigger than 44 would be to big. brad uses 44s on a 550cc cylinder
iqr gauge
dmax block off plates
pod filters or custom airbox
alll the junk from efi rip it out, gut injection. free up alot of space under the hood and dump 30lbs of electronics and the big tub of oil.
fix kit or big bore


it would be the a fantastic. Efi is overrated, Almost everyone agrees a 800r summit with well tuned 40mm carbs makes more power than a cfi800 with all its fancy stuff.

 

[moly may]

my lord, its 2014 and were still debating on how and if we can oil inj delete the poo....humm