1200 km report on t3-174 impulse turbo kit

[fredw]

been asked about its performance and reliabity..

purchased last year early 15 and now over 1000k on sled its been pretty decent, first trip out in Colorado at 12000 feet, it ran perfect. but next trip in revy we had growing pains in a tune hiccup in mid throttle that popped a set of reeds , but impulse quickly dialed tune in and Had tom from toms snow machine dial in clutching and gearing to prevent over rev what also was part of the problem as well..

found the limitations of the stock skid, what worked fairly well during break-in but soon after was found to much ski lift with the better clutching.. had swapped to racers edge skid, but still need a heavier rear spring from racers edge to hold skis down, also went up to 8 tooth drivers..
seams pretty good now, but still assessing it performance

added a few other personal performance touches and overall, have not touched sled other than regular maintence last 600k

very easy to see the impulse quality and engineering in this kit.. its been very well thought out from the turbo choice, size of compressor, to the non adjustable fueling that has worked from 1200' to 12000' and ambient temp swings from -20 to +20c and no hiccups, coughs, or pops..
even in the deepest of snow and yes this is a non intercooled kit

as for negatives, it seams to be louder than other kits maybe because of divorced waste gate, but not so much for the driver.. cost of the kits are not cheap, but quality and performance in this kit shows quickly over other kits..

been running 5lbs boost all this year, track speeds have been excess of 65mph.. this last weekend I first learned how to adjust boost controller... and now 6 lbs even better speeds, driver needs more talent..lol some of the comments I hear from others running it or watching is how quick and clean it sounds compared to other kits, and performance difference thumbs

up to Zeb and Paul at impulse..

good job few videos

https://youtu.be/BvMotYGv4zo
https://youtu.be/j7Yju0uLgwQ
https://youtu.be/ZIvHEg57PUg
https://youtu.be/-CEBgAM2Tmg
https://youtu.be/SvZuPymO-lo

 

[fredw]

https://youtu.be/SvZuPymO-lo

https://youtu.be/ZIvHEg57PUg

https://youtu.be/j7Yju0uLgwQ

 

[bingo1010]

What are you running for fuel with 6 lbs?

 

[Bnorth]

Someone link Lund to this thread

 

[d mills]

Someone link Lund to this thread

He left the site forever.....except the post he made last night.


Sent from my iPhone using Tapatalk

 

[DRD]

He left the site forever.....except the post he made last night.


Sent from my iPhone using Tapatalk

That's sad, I liked listening to how cool he was compared to us unwashed masses of mediocrity.

 

[tex78]

He left the site forever.....except the post he made last night.


Sent from my iPhone using Tapatalk

That's sad, I liked listening to how cool he was compared to us unwashed masses of mediocrity.

Oh he's cool guys, everyone has there own opinion

 

[lilduke]

Looks like that sled hauls azz Fred

 

[deaner]

Have you had a chance to compare to the boost it kits Fred? Curious how they compare to the impulse.

 

[fredw]

Been running 50pump, 50 av, since I got it, and yes since it had the reflash the reliabity has been second to none.. Even a 6lbs its pushing skid and driver talent to its limit..

above climbs were were all done for the virgin first time as you can tell.. Certainly a few screw ups.. But blow me away how much easier the climbs are then looking at them from the bottom.. Dealing with the ruts from everyone else is the real player

 

[fredw]

Been out with three doo boost it kits, and one non intercooled and they have ran well, non intercooled was noticalbly snappier off the start.. A few were not broken in yet and a few changes needed in clutching.. Next time we compare would be more of a fair comparison.....Saying that the Impulse has done well for its boost

we also have aero kits, Boondocker kits and a few great running 872 yet to be seen

Have you had a chance to compare to the boost it kits Fred? Curious how they compare to the impulse.

 

[fredw]

Copy and paste from snowest from Zeb giving a finer detailed explanation on the kit and what they found with non intercooled charge temps with their kit..


The impulse fueling is a standalone ecu running parallel with the stock ecu. In other words we don't use or manipulate any of the stock electrical components or stock fuel. The only stock inputs we read is the tps and coil ignition..Impulse inputs to the impulse ecu are: map, baro, tps, coolant temp, air temp, wideband . 6 inputs to the ecu... More inputs to the ecu=more refined crisp tune. And it takes all these inputs to be able to auto correct itself . I can't remember the last time we had any of our sensors fail (with the exception of the wideband sensor so we always carry a spare). However if a senor does fail the impulse ecu has led lights that pinpoint what sensor is the culprit. And if a senor does fail the ecu goes into a safety map so you can ride the rest of the day safely without that sensor.

We dump the wastegate to the atmosphere because that's what is designed to do. By plumbing it back into the exhaust your defeating the whole purpose of a external wastegate which is -reduce back pressure. We run tial turbine housings and tial external wastegates for this reason. Plumbing the wastegate dump increases turbulence in the final exhaust which increases back pressure which is inefficient. Every thing we design is for optimal efficiency. Which leads me to oiling the turbo...

There are some using the injection pump for oiling the turbo. We aren't going that route because #1 our turbo oiling works and we've never lost a turbo because of oiling. #2 Garrett turbos were designed to be fed a small amount of oil fir optimal throttle response. If you feed the turbo oil from the injection pump you have to dead end the turbo oil return. By doing this you will eventually fill the entire center section with oil which again will increase drag on the turbo and decrease throttle response. There is a reason garrett puts on oil resrictors and only requires a small amount of oil. Again, we could save money and time doing it the other way but we won't sacrifice performance to save a few bucks.

Intercooler...As I mentioned before we have a air intake sensor with our ecu. When paul tunes he monitors this sensor. The highest we've seen the intake temps at 10 psi are 110 degrees. That's really good. Now, this was with the skidoo kit but we're expecting similar with the Polaris. If someone wants to run 15 psi or higher then yes you probably need a intercooler.