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Hpi Pro 4


Old 10-28-2005, 05:09 PM
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Originally Posted by arrow195
I just finished building my RS4, man is it fast. Only one problem, if I give it too much throttle the rear-end gets very loose. Also when I release the throttle it swaps ends. I haven't raced on-road in quite a while and I have no idea where to begin. Any suggestions? Thanks
Both ends are loose- sounds like tire issues. Also check your droop (add more front , less rear), tweak, shocks and diffs. You should download Haras 2004 Nats set up.
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Old 10-28-2005, 05:36 PM
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Are you running the oneway?sounds like the rear dif is to tight and you need to take any drag break out of the car in stock in should roll when trigger in is the nutral pos.
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Old 10-28-2005, 07:33 PM
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Thanks, I will take a look at those things and make sure my diffs aren't too tight.
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Old 10-29-2005, 03:47 AM
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Default hpi pro 4 2004 vs xray t1fk 04??

hey looking at buying a second hand car. which of these to is the most reliable a few people said the pro 4's front dive chips teeth is this true or is it because of bad mesh? im gonna be running stock which is the better car??? or should i buy a new tc4??? im really confused people keepsaying ones reliable then say it isnt are they both reliable cars??
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Old 10-29-2005, 06:01 AM
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Its true, you can break teeth off the bevel gears on pro4's, but with stock racing it is very very unlikely.
Ive been running 19t spec all season and broken one bevel gear....all due to a bad mistake from me at a fast part of the track....and unforgiving track markings .

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Old 10-29-2005, 09:11 AM
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If you out fit your pro4 with a front diff, you will not chip the teeth. I am still running 1.0 gears with a front diff, and I havenít had any gear failures.
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Old 10-29-2005, 12:32 PM
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Yeah, I agree. Take the one-way out and install a diff and you won't have any problems!
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Old 10-29-2005, 01:41 PM
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Default Shock Position

Hi guys can you explain to me how the shock position works as i am running on med grip asphalt and would like to know how i can tune it further.

Thanks for helping
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Old 10-29-2005, 03:19 PM
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I'm upgarding my camber. Which do you guys think is better? The graphite camber plate or the aluminum camber plate from the 2005 edition? Has anyone here tried using both? What difference does it have? By the way, I run my car on asphalt track.

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Old 10-29-2005, 10:34 PM
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aus jd 2703- The TC4 will chip teeth, too. It all depends on what you use to get power to the wheels- a diff, one way, or spool. One ways and spools will both have problems with chipping teeth. I have an aluminum front bevel gear, so I don't have problems at all, but a diff will be fine. Spools and one ways (only on-power) don't allow the wheels to spin independantly, so it's really hard on the gears. This is the same with the TC4. A guy at my local track took his spool out after a race, and was missing literally half the teeth. And yes, a bad mesh WILL make it easier to chip teeth, but a GOOD mesh is easy to get. Either car will suit your needs, but since the TC4/Pro4 are relatively similar, they will have similar problems. Don't let those people fool you by saying a Pro4 has gears that strip easy.
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Old 10-30-2005, 06:37 AM
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Default Shock Springs


I'm having trouble figuring out which front and rear shock springs I should purchase. The HPI Shock Spring Chart seems to be outdated, and as far as I can tell, the Hara edition springs are all 400 gF/mm (22.4 lbs/in). Isn't 22.4 lbs/in a little soft for the front of the car?

I'm purchasing a couple Hara edition shock kits for my Pro 4, and any help on the makes and models of your preferred springs and oil match ups would be greatly appreciated.


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Old 10-30-2005, 06:41 AM
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best thing to do is treat yourself to the hpi spring kit. as well as get all 7 pairs of springs youíll get an up-to-date spring chart.
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Old 10-30-2005, 10:05 AM
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I still have my Associated spring kit from when I sold my Losi. I'm going to try purple(30lb) in the front and copper(25lbs) in the rear. I am also trying 35 weight Losi oil in the front and 32 1/2 in the rear. I had the stock silver springs on before and it was way to soft. I might try going harder on both springs and oil as well. We'll see what happens on Wednesday.
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Old 10-30-2005, 10:52 AM
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guys any chance a yok spool fit into our pro4?
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Old 10-30-2005, 11:04 AM
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Is HPI oil on par with Associated Oil? I want to duplicate Hara's ROAR Nats Asphalt set up and it calls for 45 in front & 35 in back but no LHS carries HPI oil. Will 45 & 35 Associated Oil be on par?
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