Engine cooling and Intercooler

[revx827]

Ok. Looking for some advice/suggestions.
Starting my Turbo build. Trying to nail down all the loose ends.
My first concern is cooling capacity. I was initially planning on full race gas setup. Water/air intercooler with icebox. Didn't really have that much concern.
Now I am thinking of toning it down a bit and making the sled a little more "trail" friendly. This will be a low elevation sled.
My first and biggest concern is cooling capacity. My sled is a shorty. (120) I plan to extend it to 136. With the coolant running thru the turbo I am concerned about elevated temps. Most turbo sleds are long tracks and have the advantage of longer/bigger coolers. DO I need to be concerned? Should I be adding more cooling capacity for the engine?
The next thing is intercooler. What would be a prefered setup? I see alot of kits that do not have any. I do plan to eventually go with a water/air setup and icebox. But that will be strictly for racing. For now I want to focus on tuning and becoming more familiar with the setup as a whole.
We end up with normal temps being close to 30*.
Lastly (for now) Is there a prefered carb to use? I can go with rounds, flats or tmx. Still trying to decide on the power plant. 700, 800HO, or 860r.

 

[Wheel House Motorsports]

stick with the stockers off a doo. pull dpm lines off. add boost pressure to uppers and plug the lower 3/8" lines(hook them together) and maybe add pressure to the slide tops. boom. done. start with the jets doo recomends for non dpm motors of that size. should be dang close to start.

 

[revx827]

Anyone else with some insight? Leaning towards a GTX 3076 w/ tial housing.
How much can a tra5 take? At what point should I be thinking STM clutch?

 

[gus bohne]

The tra 2 or tra 3 are great for your intended use. the tra 5 is fine too just much to heavy on the levers for the 800.

NO way will the 120 coolers handle it on groomed icy trails.. use a real temp gauge and judge from there. if 136 ing is in your plans get a 440 rear cooler and add it when you extend the tunnel I did just that and never got hot.

Plumb the turbo coolant correctly or dont cool it period. do not use the heater loop as it dumps you now 200 degree turbo heated coolant directly back into the water pump at the bottle sending eng temps up like a rocket..frig that mess !!!!

You are dead on the money for turbo sizing and that fawker will be a shreading beast.. get that head to the crank shop for removable domes so you can easliy get them re cut for low elevation boost. and of course change out if ya need for high elevation.

get your R cylinder to them aslo and have .030 removed from the base. low e port time makes for animal turbos.. HO cylinder 800's are pooches on boost vs older NON ho cylinders..

double up the HO reeds get them from HPE and smile all the way every day.

I love my old 800 rev turbo but I think every snowester KNOWS that all to well....LOL

2004 and still on the same bottom end not even .001 runout.. new reeds finally last yr after all those yrs at 23-27 psi down the lake.. every weekend.

I have a BELLMAN billet tra 2 on that sled and for the money YOU CANT BEAT IT.. the guys selling them Are making it easy for WE who know how to tune them.. same belt ful season .. still like new..2 for sale on doo talk used for 900.... you WILL LOVE IT> I promise or will buy it from you.!!

Gus

 

[revx827]

Thanks Gus.
I have always ran a digital temp gauge so I have that covered.
My tra5 has the aluminum arms in it. I have a set of non HO cylinders on the shelf.
Better to use them than "turbo ported" HO cylinder?
What compression would you recommend getting the domes cut at?
And then what would be some guidelines for boost/octane?

 

[TreeThrasher]

That sounds like a ton of turbo for an 800...how much boost are you looking too run? Has anyone on here tested the X 3076 on an 800??

 

[revx827]

Ski-Dooin it is running a 3071 on his 700. My plan is to run as much boost as I can with 100ish octane. I am leaning towards using one of my 860r cylinders. RKT turbo domes/pistons.
For cooling I will add a 440 cooler when I extend it to 137. Possibly with some xlt runningboard coolers.
After much more reading I will use a water/air setup. Still deciding on whether or not to use a seperate closed loop for it.

 

[Visi]

Please post pictures of your water/air if you go that route. Sounds killer man

 

[revx827]

Will the front heat exchanger provide enough cooling by itself for the intercooler or would I need more than that?

 

[gus bohne]

With a garrett turbo the front is fine for mid boost 900 cc or smaller.
with any other brand turbo you need much more as the comp and hot side are NOT seperated and heat soaking is a major issue.





Gus

 

[revx827]

Would it be better to add some running board coolers to the front cooler for the turbo?
Just want to make sure it has enough cooling.

 

[revx827]

So after much delay..... I am finally back to working on the chassis.
Still trying to figure out cooling. I am going to run the turbo off the front cooler.
Adding a 440 cooler to the back(120) Or using a 137 if I can find one. How much cooler is recommended for the intercooler?

 

[Visi]

Are you going to use the front cooler for the intercooler then too? I would probably go to the 137 cooler since you are eliminating the extra cooling. I would also run a water temp gauge. Ran a egt and it bounced around and wasn't very consistant. Btw, ran my 3071 .7 ar turbine housing and .63 tial compressor housing turbo at 10# of boost all season on 100 octane or so with no det or problems.

 

[Visi]

Are you going to use the front cooler for the intercooler then too? I would probably go to the 137 cooler since you are eliminating the extra cooling. I would also run a water temp gauge. Ran a egt and it bounced around and wasn't very consistant. Btw, ran my 3071 .7 ar turbine housing and .63 tial compressor housing turbo at 10# of boost all season on 100 octane or so with no det or problems.

 

[revx827]

I am wondering if I may need to run 3 loops. Rear for the engine. The front for the turbo.
And figure out something for the intercooler.

 

[taylorbok]

3 loops sounds aggressive, most people I have seen run the turbo with the engine coolant and then a separate for the intercooler, I would like to see your set up I am going to do one too on my xm