A Few MPI Turbo Questions: Heat / Intercooler / PCV-PTI

[jeffgilbert]

I have a few questions for you guys with MPI turbos, I have done lots of searching on the site and have found most of my answers but I still have a few questions.

HEAT
Is there any upgrading to the cooling system that I should do? Has anyone tried engine ice? Or is the stock cooling system enough with the screen removed from the rad as MPI suggest. Also has there been anyone warping the headers, exhaust pipes and covering the tunnel to keep the out of the engine bay.

INTERCOOLER
Guys that have upgraded to the stage 1 kit do you think this was money well spent? I know it will give me the most consistent performance and if I want to make big power its needed but I plan on staying at stock boost levels because I don't want to get into building up the motor at this time, also do you remove anymore of the hood then MPI suggest for better air flow over the intercooler?

PCV-PTI
Is going from the GEMS controller to the PCV-PTI that much better? Its a nice bit of money to go this way when I have already paid for a GEMS in my kit. I have heard that the PCV-PTI gets better millage and I already have some PCV accessories that I could link up to it, with a few more pieces (WB2 and Pod-300) it could be my gauges for almost the same price as buying a AFR and boost gauge. But I don't plan tuning much I just want to set and go and i will be running stock boost.


This MPI kit is going on e 2015 RTX LE 1.7 just for reference.

Thanks for the input

 

[Studroes144]

I did the switch from the gems to a pc5 pti with Ulmer tune on my stage 2 kit. For an upgraded turbo setup you can't beat it, mine starts perfect, idles perfect and I can run from 8 pounds up to 14 pounds without making any changes in tuning at all. Also as u said the pc5 allows you to add on different tools, one of the best (IMO) being the ignition module, with that on there you can raise your rev limiter which really helps when it comes to clutch setup since the stock rev limiter on the viper is set so low and my personal favorite is the stutter button launch control which is just down right cool with the power commander setup you're opening up a whole new book of tuning capabilities if/when you decide to upgrade your setup. My option on the gems is that "it works", it gets the job done but leaves a lot of potential on the table.

 

[jeffgilbert]

Do you think the pcv-pti with a tune from ulmer (which was the plan anyway) is that much better if I was leaving it on stock boost? I already have a ignition module and that why I was leaning toward this so I could raise my rev limiter so if my clutching isn't spot on I'm not bouncing off the rev limit.

 

[Studroes144]

Do you think the pcv-pti with a tune from ulmer (which was the plan anyway) is that much better if I was leaving it on stock boost? I already have a ignition module and that why I was leaning toward this so I could raise my rev limiter so if my clutching isn't spot on I'm not bouncing off the rev limit.

On low boost, no I don't see any real advantage in performance as far as fueling is concerned, but if you're on the rev limiter much at all, that kills performance. With all the power commander stuff that you already have I wouldn't hesitate for a second to buy the pc5. I must say tho that my mpi turbo with the gems controller never started as good as it does now with the pc5, that is worth a lot in itself when considering potential starter issues.

 

[Joe ltx-le]

I can only tell you from my experience with my trail kit. If you run under 0c then cooling will not be a problem. My sled runs very cool when below freezing.

But above freezing the sled will heat up very fast if on small slow trails. I think a fan switch wouldn't hurt, so that I can run the fan sooner then when it comes on automatically.

 

[yamahaguy]

I can help with your heat question. Its a none issue. The turbo sleds run the same temperature as NA sled without upgrading the cooling system and I still use the screen on the radiator. Our last ride was a days worth of backcountry riding at low speeds with lots of throttle and no turbo vipers overheaded. It happened to be 60 degrees F (15.5C) that day also.. They will heat up fast if you let them idle but so does a NA sled.

No problem with headers, I think that was mostly on 14s.

If you're going to keep the trail kit stock you don't need a intercooler, the low boost pressure won't generate enough heat to require a intercooler.

 

[Studroes144]

I've ran straight ice trails for an entire ride last year (70 miles) with 3 other 2 strokes, they all heated up and had to stop every 5 mins to dig up some snow to put on their tunnels, mine never got above 175 degrees and there was a lot of wide open blasts cuz trails were perfect. That's a stage 1 innercooled kit. I don't think a trail turbo would have been able to stay that cool for that long .

 

[yamahaguy]

I've ran straight ice trails for an entire ride last year (70 miles) with 3 other 2 strokes, they all heated up and had to stop every 5 mins to dig up some snow to put on their tunnels, mine never got above 175 degrees and there was a lot of wide open blasts cuz trails were perfect. That's a stage 1 innercooled kit. I don't think a trail turbo would have been able to stay that cool for that long .

When the air intake is outside the sled the trail kit works excellent keeping cool.

 

[Byam]

cooling system is almost perfect ,on the viper mpi for trail riding. No heat and NO ice in the tunel.....
I am prety sure that will NOT be the case for the new SW.....

I never run the pcV , butt fo my experience whit mpi Geems this thing suck!

Good mapping, EVO or pcV +autotune REAL STRONG BRACKET that will NOT use the small magneto cover bolt and this kit would be almost perfect!

 

[Support@MPI]

cooling system is almost perfect ,on the viper mpi for trail riding. No heat and NO ice in the tunel.....
I am prety sure that will NOT be the case for the new SW.....

I never run the pcV , butt fo my experience whit mpi Geems this thing suck!

Good mapping, EVO or pcV +autotune REAL STRONG BRACKET that will NOT use the small magneto cover bolt and this kit would be almost perfect!

Any issues you will have with that mount location will be from Improper turbo alignment during install. Theres more supporting the turbo than just the rear mount.

 

[RacinJason15]

Any issues you will have with that mount location will be from Improper turbo alignment during install. Theres more supporting the turbo than just the rear mount.

Quick question. I installed my turbo kit and hood fitment it quite tight and tough to get the hood back on. I have shortened the separator hose that goes in on the top and made if fit under the hood better, but is there poor fitment after installing the mpi kit? Seems to me the radiator is almost sitting to high and causing the back of the hood to lift. Any insight from mpi or from other people who have installed the kit would be helpful!

That hose sticks up so far that the hood is completely impossible to put on without the back hook out of its mounting location!


Sent from my iPhone using Tapatalk

 

[jeffgilbert]

I can help with your heat question. Its a none issue. The turbo sleds run the same temperature as NA sled without upgrading the cooling system and I still use the screen on the radiator. Our last ride was a days worth of backcountry riding at low speeds with lots of throttle and no turbo vipers overheaded. It happened to be 60 degrees F (15.5C) that day also.. They will heat up fast if you let them idle but so does a NA sled.

No problem with headers, I think that was mostly on 14s.

If you're going to keep the trail kit stock you don't need a intercooler, the low boost pressure won't generate enough heat to require a intercooler.

So from a performance aspect to you think the intercooler is not worth it if the intake is mounted outside if running the stock boost 5.5-6psi is the most the stock motor can handle befor you need studs and low the compression right?

 

[Studroes144]

So from a performance aspect to you think the intercooler is not worth it if the intake is mounted outside if running the stock boost 5.5-6psi is the most the stock motor can handle befor you need studs and low the compression right?

At 6 pounds you're already getting close to the limits of the stock fuel system. Stock compression can support a bit more but don't push that line cuz bad things can happen! I'm referring to the mpi turbo, the hurricane turbo for example with the bigger injectors is 100% safe at 6 pounds.

 

[yamahaguy]

So from a performance aspect to you think the intercooler is not worth it if the intake is mounted outside if running the stock boost 5.5-6psi is the most the stock motor can handle befor you need studs and low the compression right?

That's correct, I don't think a intercooler is worth it at stock boost levels on the trail kit at least for me its not. Here is why. They way most of our group rides is low speed off trail playing around in meadows, hills and in the trees. There is very little air flow to begin with and lots of heat under the hood so with the stock trail kit and the air intake outside of the sled the compressor is already being feed nice cold dry air. This combination runs cool all the time. Now just think if you had the air intake under the hood. Your already starting with hot steamy air at the intake before you even get started. Next run that hot air through a intercooler that under the hood in area that's hot to begin with and in my case in getting any air flow through the radiator so I would be actually heating up the air even more and that kinda defeats the purpose. Intercoolers work great but only when you get air flow, depends on how you ride. This picture was a ride few months ago and is pretty common. Take a look at my radiator and notice its pretty much plugged with snow and no air flow, if I had a intercooler under the hood the only thing it would be doing making my wallet thin. Just my 2 cents.

 

[yamahaguy]

Quick question. I installed my turbo kit and hood fitment it quite tight and tough to get the hood back on. I have shortened the separator hose that goes in on the top and made if fit under the hood better, but is there poor fitment after installing the mpi kit? Seems to me the radiator is almost sitting to high and causing the back of the hood to lift. Any insight from mpi or from other people who have installed the kit would be helpful!

That hose sticks up so far that the hood is completely impossible to put on without the back hook out of its mounting location!


Sent from my iPhone using Tapatalk

Sorry your hood don't fit becasue it should fit with no issues. Let me try to help.

That aluminum 90 in your picture probably need 1/2 to 1/4 inch cut off both sides and reinstalled . You can also take a few zip ties and pull the 90 over towards the sleds frame to gain some room. I like this just to keep the air/oil box secure. Are you sure the air/oil box is sitting down all the way next to the clutch guard and is hose is routed correctly where is runs under the steering post to the other side?

Your radiator is pretty straight forward and I don't think that's holding your hood up. I would pay close attention to where your hood was trimmed for the air box. If it was not trimmed enough it holds your the hood up and the back will pop out all the time. If its touching you will be able to see where it rubbing on the aluminum just trim more on the hood. I hope this helps, if you don't have any luck then bring it up this summer and we will help getting it fitting prefect.

Give your installer a kick in the A$S next time you see him and stay thanks for not finishing the install.