RE: Official HPI Hellfire Thread
 

I dont think u will find alloy versions of the plastic diff cases anywhere.
90% of HF owners do have major diff problems, i think windowlicker is very lucky with his diffs. Do what WL advised re shimmimg the diffs right, ensure diff bearings are good and the plastic diff cases arent warped otherwise your pinions will move off the crown and will wear very very fast.

RE: Official HPI Hellfire Thread
 

Hi,

I would advise you too to stick with your stock diffs, have the HF now more than a year, no diff problems at all !!

Kyosho p6 o-rings in the diffs is better!

RE: Official HPI Hellfire Thread
 

Start from March,2006 , my HF RTR & HF SS also no diff problems at all .

RE: Official HPI Hellfire Thread
 

I think its just like most cases, if there is a problem, people will log on to a forum and complain, if there is no problem then no one bothers to report back. This results in forums being full of problems, making it seem like a high percentage. I bet its more like 10%, not 90% but I can see why you would think that. One big cause of diff problems is people chucking in high horsepower engines which the stock drive train cannot cope with, or incorrectly built diffs.

As long as you do the push pull test I was talking about earlier, to make sure the pinion and spiral gear don't crunch, you should be ok. I've heard people using thick diff oil to lube the spiral and pinion gears instead of grease, as it pools inside the bottom of the outer diff case and keeps everything properly lubed. The grease usually just sticks to the outer case no mater how much you put on the gears, meaning less lubrication over time.

RE: Official HPI Hellfire Thread
 

Here are a few pics of my shells, I stripped and resprayed the yellow one which I highly recommend you don't try! It took over 3 weeks of graft to get it off with nail varnish remover! Bought a new one which I sprayed black but not use, just for when its stored!


http://i12.photobucket.com/albums/a2...5/94092375.jpg
http://i12.photobucket.com/albums/a2...5/41fcb341.jpg
http://i12.photobucket.com/albums/a2...5/55f3d5ce.jpg
http://i12.photobucket.com/albums/a2...5/8c7a8d0c.jpg
http://i12.photobucket.com/albums/a2...5/cd2daf6f.jpg
http://i12.photobucket.com/albums/a2...5/eaa5bd38.jpg

RE: Official HPI Hellfire Thread
 

nice pics, I really dig the clear one!

RE: Official HPI Hellfire Thread
 

the clear one is now the gold one with all the stripes

RE: Official HPI Hellfire Thread
 

that orangeish body is sweet!!!!! what is the name and brand of it?

RE: Official HPI Hellfire Thread
 

it was just the stock hellfire shell

RE: Official HPI Hellfire Thread
 

sorry, i forgot to say the color and brand of the PAINT

RE: Official HPI Hellfire Thread
 

i dont want to be a smart arse but if you use cellulose thinners (you can get from halfords) it would have taken the paint of in five minutes and left the shell intact.
i am going to do the same with mine this week end and spray it black and silver.

they look good though.

RE: Official HPI Hellfire Thread
 

haha, well now I know...

I have no idea what the brand of the paint was, it was a bright orange/yellow. It came with the SS I bought second hand

RE: Official HPI Hellfire Thread
 

Anyone know how to improve on power steering? My diff oils are 5-15-3. Is my centre too thick? My Hellfire has great off power steering, you can really throw it into corners, but as soon as you apply the throttle, even a small amount, the steering drops. It means at the moment I have to make sure I am properly lined up with the straight before I can accelerate, which slows me down a lot

RE: Official HPI Hellfire Thread
 

i would have thought so. you need to about 70 % of the power to the rear wheels, to stop the front ones spinning. i have been told from my local modle shop to put 7-10-5 in mine. thats what he uses on his losi 8ight t. but it just might need fine tuning to the track surface

RE: Official HPI Hellfire Thread
 

I put thicker in to prevent the front wheels spinning, maybe I need to use 7-10 and see how that affects the turning, I just hate the front wheels ballooning when I drive in a straight line

RE: Official HPI Hellfire Thread
 

I could be very wrong here, but, diff oil weight won't change whether or not your front wheels balloon....that's coming from how fast your wheels are actually spinning around (which means, the way to make them not balloon, is to slow down)

I've got a savage now, and am considering buying a Hellfire used, and experience with the savvy has been quite fun, just converted it to brushless, and that'll be what I do to the hellfire before I even run it once....any suggestions other than what's already been mentioned with the diffs? (was considering just getting the savvy 4 spider kits and the savvy aluminum cups if they'll fit, I know the 4 spider kit does)

RE: Official HPI Hellfire Thread
 

Well a thicker centre diff will stop the power going straight to the front when the front lifts off the ground during acceleration. Thicker oil distributes the torque more evenly between the two sides. A diff naturally wants to provide the power to the easiest route, if the front is off the ground, they will spin extremely fast and the rear will lose torque. Adding a a thick diff oil gives a more even power distrobution under uneven traction conditions, meaning if the inside wheel loses traction during a turn, the outside doesn't lose as much power as it would if the diff had lighter oil in it.

My question was, does a too thick an oil in the centre diff cause negative turning characteristics?

RE: Official HPI Hellfire Thread
 

You say that the front lifts with 15k in the center? Doesn't sound like a good thing. I'd stay in the 12-14k range for the center. If you want the rear to rotate more as you corner, you might try 4k in the rear. Give 7/14/4 a try. Track condition and engine will determine what's best for you.

RE: Official HPI Hellfire Thread
 

no, by 'lift' I mean when the weight shifts to the rear under acceleration, meaning the front end goes light and the wheels are more likely to slip, spin, and balloon. I wanted to prevent this as much as possible so used 15,000. But I think its too thick, causing understeer out of corners when I accelerate.

I'll try a thinner oil and report back

RE: Official HPI Hellfire Thread
 

Hi there, i am new to this hobby and just got a 2nd HF, need some advice from you guys. I am driving a HPI HellFire with stock suspension (i think).how do i know if the shock is too soft or too hard? Is there a difference setting if i run on tarmat road and off road track.
I run the truck the last time on a tarmat road , and almost every power slide i do or hard turn i take the truck will flip over. Now..

-how do i strengten the shock ?
-wat i a shock clip for?
-the number on the oil?
- wat does piston hole side affect the shock?
-any nice setting aly one can recommend.

Thanks Guy

RE: Official HPI Hellfire Thread
 

if its flipping, it may be the suspension is too hard, causing the ride height to be too high. Its the opposite of what you think you need, but if you put softer springs / thinner shock oil in, the car will sag more and have a lower ride height, resulting in more stable cornering. Alternatively, take any shock spacers out and keep the suspension as it is and see if it helps. I had a race a while ago where my suspension was set too hard, and too high, and it just caused overturning in the corners. Tarmac is a high grip surface though!

RE: Official HPI Hellfire Thread
 

Sorry to bump in. But I have a quick ?. I guy that lives by me is selling his Hellfire, he claims he just whats to get out of nitro rc. He is selling his Hellfire for $75. I don't know what kind of condition it is in, but I figured if it needs a new motor and some other things , so what. Drop some $ into it and I would have one hell of a truggy. Just wondering what you guys think.


Thanks Greg.

RE: Official HPI Hellfire Thread
 

$75 is a killer price as long as the Hellfire hasn't been completely trashed. If he can't start it for you and run the servos then you'll have to put a lot of work into it. If it's just a few minor parts that need to be replaced then I would jump on that price.

RE: Official HPI Hellfire Thread
 

$75?????[X(] Grap it man...

RE: Official HPI Hellfire Thread
 

maybe for an rtr it is good value, if its an SS its a steal!