Turbo Questions For Pump Fuel

[ippielb]

Hello, i have a F7 firecat with a D&D Big Bore that uses Arctic Cat 800cc pistons. My engine is the same engine in the M7's, and i'm looking at purchasing a turbo kit thats off of an M7, he said it ran 5lb's of boost, and mixed 50/50 with race fuel. It is an aerocharger 53, non intercooled. With my big bore 800, what would it take to make it run on straight pump fuel, I'm not interested in running race fuel. I may be interested in mixing some aviation fuel though, much easier to purchase here.

 

[everytime5.9]

The m7 has to have the proper wiring setup to allow everything to work correctly. Does the kit your interested in purchasing use an upgraded fuel pump? If not then most likely the fuel pump can only provide enough fuel for around 5 psi safely...
The big bore with stock m8 pistons is a good choice. But what has been done to the head? You will need a lower compression head similar to stock, especially if you want straight pump fuel.
To determine your octane requirements we need to know whats been done to the head. What elevation you ride. What pump octane you have available with or without ethanol. That being said without a high comp head 5 psi is a pump gas only setup... 1-2 gallons of avgas never hurts anything either but let us know where your riding...

 

[ippielb]

There is no upgrade to the fuel pump. Or fuel delivery, stock pump, and stock injectors. I have the big bore with stock M8 pistons on the sled, and will be rebuilding the top end either before the turbo or after. Or, would it be better to break it in with the turbo installation to give it a good seat? The head was machined by D&D to match stock i believe. Looks extremely similar to my stock 700'cc head, just shaved a little deeper around the edge. At home the elevation is around 1800-1900 feet, highest octane i can get here is 91 octane without ethanol. But am torn between moving out west in BC this winter.

Aviation gas is readily available.

 

[ippielb]

Bit the bullet, I got an aerocharger 53, AEM boost gauge, Air Fuel mix guage with guage pod, and an attitude industries fuel controller all on the way.

 

[ippielb]

Anyone got suggestions? I'm going to run it at 6psi, would that be low enough to run 91 octane premium? Or would one need to mix in a little aviation fuel.

 

[everytime5.9]

You should measure the squish band in the head and calculate your compression ratio. At your elevation with an aero 53 you should be mixing some avgas. The stock pump should provide enough fuel for that aero at that elevation...

 

[ippielb]

Just got my turbo in the mail, started installing it today, need to trim a little on the front of the bulkhead (1/2" inwards x 2.5" long) for the airbox connection, need to custom mount the turbo because the M series bracket is useless to me. I'm going to get it all installed, then re-do the top end, seen a little bit of scoring on the pistons so i'm going to play it safe and replace them.

Edit:
Also, looking for some help installing some gauges, i have a boost gauge, and and Air Fuel gauge, both AEM for cars, was already on an M8 before. Where should i take power from? Accessory fuse? Or fuel pump?

What filters are the best for on top of turbo's? filters off of cars? Or just a prefilter?

 

[everytime5.9]

Just got my turbo in the mail, started installing it today, need to trim a little on the front of the bulkhead (1/2" inwards x 2.5" long) for the airbox connection, need to custom mount the turbo because the M series bracket is useless to me. I'm going to get it all installed, then re-do the top end, seen a little bit of scoring on the pistons so i'm going to play it safe and replace them.

Edit:
Also, looking for some help installing some gauges, i have a boost gauge, and and Air Fuel gauge, both AEM for cars, was already on an M8 before. Where should i take power from? Accessory fuse? Or fuel pump?

What filters are the best for on top of turbo's? filters off of cars? Or just a prefilter?

When doing the engine rebuild you should have that head sent off and setup for your specifications/altitude.

For turbo filters a prefilter does work fine as long as there is a supporting cage of some sort (so it doesn't get sucked in).

I'm assuming a mechanical boost gauge? What other electrical components will you be running besides the O2 guage? Any Egt's? What fuel controller? Knowing this will determine whats best for wiring. There is a limited amount of DC power available on the stock fuel pump circuit and should be kept for your stock pump only.

 

[ippielb]

I actually have two heads, so i can send one off right now to get done, One is a stock head with one side scored from pieces of rings hitting it, and the other is from the big bore kit machined to whatever specs they are.

Would you recommend a prefilter? Or an actual filter like on vehicles (K&N or similar).

It is mechanical boost gauge, i have Digitron dual EGT gauge, which is plugged in through the accessory plug in behind the servo motor. Attitude Fuel box, will be replacing my boondocker control box. There's an accessory plug in by the speedometer that one could probably plug into. But i'm assuming that's AC.

 

[ippielb]

Will AEM Gauges run on the accessory plug ins? I don't want to tap into the fuel pump for power, but i would rather run it on the accessory plug in, will the AC fry the gauges?