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Old 04-22-2007, 06:31 PM   #106
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Thanks for the tips. We have a practice session scheduled next saturday so i'll try these ideas and see what works best.
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Old 04-22-2007, 06:41 PM   #107
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Quote:
Originally Posted by IFinishedLast
Thanks for the tips. We have a practice session scheduled next saturday so i'll try these ideas and see what works best.
I'm going to try adding a bit more rear pre-load, as well as more caster. (I know that adding rear preload really helped my MT's steering when I was racing it.)
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Old 04-22-2007, 08:15 PM   #108
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Holy crap Greg that seems like alot of engine. I wish I had a truggy to put my Jammin jpx21 in to run against it.
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Old 04-22-2007, 09:01 PM   #109
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Yeah, the B7 is a very impressive engine!

Get a truggy Perry! We're gonna have a blast this summer at the track with all the truggies this year. If ya don't wanna spend a lot of moolah, try a Hellfire SS kit! For the price, you really can't go wrong!
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Old 04-22-2007, 09:05 PM   #110
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OK guys, so here's the update on the steering issue...

On the front... I pulled the stock 13 caster blocks and put in the 15 ones. If I understand HPI's instructions clearly, that means that I've changed the total caster from 20.5 to 25.5. I adjusted the toe to 0, and adjusted the camber to -3.

On the rear... I increased the rear preload spacers from 12mm to 15mm. I've got the rear toe at the stock 3 toe in, and rear camber is -2.

I took the truck for a run like this, and I am happy to say that the steering is much improved. I can carve a pretty tight corner now without a lot of push.

IFinishedLast... try this setup and let me know what you think!
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Old 04-22-2007, 10:06 PM   #111
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I guess a guy could drop the rear diff oil weight from the stock 7000 wt to 5000 wt. That would help turning as well.
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Old 04-23-2007, 08:20 AM   #112
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I'm gonna make those changes tonight. I thought about the rear diff as well but wasnt sure if that would have much of an effect.
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Old 04-23-2007, 08:29 AM   #113
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My only advice is to try not to change so many things at once since you now do not know exatly what helped.
If time permits it's often best to make changes one at a time. I dont suppose a setup sheet can be found for a Hellfire which is unfortunate.

Just for reference My CRT is set up based on Chad Bradleys average setup, and my diffs are set at 7/20/3
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Old 04-23-2007, 08:42 AM   #114
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I did look at a setup sheet on HPI's website. I'll look again tonight and if i find it I will post a link.
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Old 04-23-2007, 08:46 AM   #115
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http://www.hpiracing.com/graphics/se...0Setup%20p.pdf
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Old 04-23-2007, 04:37 PM   #116
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Quote:
Originally Posted by DiscoDan
My only advice is to try not to change so many things at once since you now do not know exatly what helped.
If time permits it's often best to make changes one at a time. I dont suppose a setup sheet can be found for a Hellfire which is unfortunate.

Just for reference My CRT is set up based on Chad Bradleys average setup, and my diffs are set at 7/20/3
What I did was take into account Brad's advice, and looked at the Hellfire manual (which has a number of pages on suspension tuning) and looked for ways to increase steering... the changes I made helped significantly, but I do understand what you're trying to get across Danno... next time, I'll change one thing and then drive it to see what happens before making another change.
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Old 04-23-2007, 04:41 PM   #117
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Quote:
Originally Posted by IFinishedLast
I'm gonna make those changes tonight. I thought about the rear diff as well but wasnt sure if that would have much of an effect.
Yeah, it's hard to say. I guess a guy just has to try it and see. I'm going to put 5000 in the rear. After looking at a lot of what other people do, most run slightly thinner oil in the rear. There's probably a reason for it.
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Old 04-23-2007, 10:12 PM   #118
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Hey guys,
My brother and I raced our Hellfires for the 1st time two weekends ago. He finished 3rd in the beginner class and I was running a healthy 2nd in the novice class (1 step above beginner) before my fuel line tore a bit and I flamed out (not sure how), but I still finished 6th after restarting. I essentially had two trucks to play with the tune and I found a great setup for our semi-tight, technical, track. If you want plenty of off power and on power steering, then try this:

7K front diff
10K center (could go lighter for more off power)
3k rear

tighten the servo saver to 6mm.

5.5lbs front springs with 1.6mm pistons and 25 or30WT Oil
shock tower mount all the way in on the upper row
lower shock mount all the way in on the arm

9lbs rear springs with 1.6mm pistons and 35 or 40WT Oil
shock tower mount on 2nd hole from inside on tower on the lower row
lower shock mount on middle hole on the arm

We run SS kits, so we were able to take out some kick-up to the let front compress easier. We ran -1 degree kickup (#1 eccentric bushing turned down in the front/front brace and #0 eccentric bushing in the rear/front brace).

rear most ackerman hole on steering rack
15 degree caster blocks

3 degrees if rear anti-squat and -2 degree rear toe in.

-1.5 degree camber in the front (using a Hudy setup station)
-2 degree camber in the rear (using a Hudy setup station)
-1 degree toe-out on the front streering (using a Hudy setup station)

We ran the camber links in the stock locations per the SS manual.

Droop: We ran 5mm more down travel in the rear. Almost maxing out the rear down travel.

He ran nubz and I ran crime fighters. Both tires hooked up nicely.

Phew! So if anyone has some free time to tune and test, give it a shot. I think you'll like the way the truck handles and steers.
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Old 04-23-2007, 10:58 PM   #119
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Wow! Thanks for the detailed setup suggestions man! I just ordered a set of springs and sway bars for the Hellfire today, so they should be in sometime next week. I'll have the ability to select spring rates and adjust the sway bars then!

I ended up putting 3000 WT in the rear diff... The HPI 7000 WT oil felt about the same as the OFNA 5000 WT, so I went with the OFNA 3000 WT. I haven't had a chance to test it yet.
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Old 04-24-2007, 01:23 AM   #120
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Hey guys, I scanned in the blank setup sheet from the Hellfire manual, and did a little touch up work to make it English only (makes the sheet look less confusing).

Here's the link...

http://www.grandeprairiercaction.net...t, English.zip <--- sorry, the link is dead (March 4, 2009) If anyone would like a copy of this setup sheet, please PM me with your email address and I'll see if I can find it on my hard drive and send it to you.
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