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#1626 |
56 - autocross
Join Date: Apr 2010
Location: Camarillo, Ca
Posts: 1,121
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Re: Make it handle
Rob:
Can you address torque or HP when it comes to autox? Many are building engines to produce big torque. Is this good or does this cause lack of rear end control? That being said, 2 1/2 exhaust or 3" exhaust (to enhance torque or HP)? |
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#1627 |
Fun Stuff
![]() Join Date: Jan 2010
Location: Sedro Woolley, WA
Posts: 400
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Re: Make it handle
^^^ Along those same lines, in the May issue of Street Trucks they have an article following the install of a new cam and intake in Hell Boy. To start the dyno readings are 506 HP and 412 ft-lb torque, then after it is 457 HP and 445 ft-lb torque. Is that what you were looking for or is that a typo? I understand that torque is what you need to get moving, and it has more effect than HP in autocross. They gave no explaination as to why the drop and some might see that as the wrong way to go.
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Jay 68 C10(project) 88 Honda Accord(DD) 93 Chevy Astro EXT 2wd |
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#1628 |
Registered User
![]() Join Date: Apr 2008
Location: San Diego California
Posts: 1,316
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Re: Make it handle
Hey Rob is there a web site that lists the rules for Auto cross? I.E. tires, engine size, weight, roll bars, all wheel drive vs 2 wheel? I know there are different classes but where are the cut offs for the different classes?
There seems to be a lot of guys here including myself that are looking to auto cross our trucks and it would be helpful to know the parameters
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I'd rather attempt something great and fail.. than try something ordinary and succeed. Norman Vincent Peale Project: Barn Raising http://67-72chevytrucks.com/vboard/s...d.php?t=414961 Project: 30 Be Low https://67-72chevytrucks.com/vboard/...d.php?t=830583 |
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#1629 |
56 - autocross
Join Date: Apr 2010
Location: Camarillo, Ca
Posts: 1,121
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Re: Make it handle
Oh, forgot. Rear end gear combo? I know there are a lot of factors, but what is a good overall for a autox pickup? 3:50, 3:73, 4:11? If there are too many factors, how would one determine it? What are the goals that need to be accomplished?
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#1630 |
Junior Member
![]() Join Date: Apr 2013
Location: Charlotte, NC
Posts: 50
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Re: Make it handle
I've got one for you:
I've got a new to me, fairly stock 1972 K20. It has a steering issue. When I get up to moderate speeds (40+MPH) the steering seems to react incrementally. What I mean...I make a small correction when driving, but either the steering is slow to react and I make too big a correction (it catches up) or something else. I can't really narrow it down, but it takes a lot of attention to drive this truck and moderate speeds. I really need to fix this, but I don't know if modern mechanics will be up to the task. Of note, the "Stabilizer shock?" seems very old/original if that helps. |
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#1631 |
Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,932
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Re: Make it handle
hart11b, have you checked all the steering connections. From the inner and outer tie rod ends to the pitman arm? It really sounds like something is loose or worn out. Check the ball joints while you are in there. There are lots of connections for the steering.
You also need to remember in stock form the steering boxes are "slower" than a new truck. you have to turn it more to get the same response. Without knowing your history it may just take some getting used to the differences.
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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#1632 |
Registered User
Join Date: Feb 2013
Location: Bismarck, ND
Posts: 26
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Re: Make it handle
Mike,
scca.com. Go to "downloads" near top, scroll down to solo rules, click on "go to solo cars and rules page" then "2013 SCCA SOLO Rules". Not sure why it's called "SOLO". There are also links to local events and clubs, no need to be a member to play. My first event in my 64 short wide was a couple years ago and I had the guys at the event help me with classification. I run in the Custom Prepared class, which does not take many modifications to end up there. I recommend running at these events, it is a blast to drive these trucks and it's not something they see every day. Good Luck. PM me if you have any additional questions.
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Kent DRIVE IT HARD, DRIVE IT OFTEN! Short video of Black Betty & a friends 48 Panhead done by my kid. https://www.youtube.com/watch?v=8DlAdfwDQa8 |
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#1633 | |
Registered User
![]() Join Date: Jun 2012
Location: Anaheim, CA
Posts: 455
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Re: Make it handle
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#1634 | |
Registered User
Join Date: May 2005
Location: Beaverton, OR
Posts: 3,728
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Re: Make it handle
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New Project: 1966 LWB C20 Plans: 1/2 ton conversion Dropmember front Dropmember rear Corvette discs Restored raised bed http://67-72chevytrucks.com/vboard/s....php?p=4295210 |
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#1635 |
Registered User
Join Date: Dec 2011
Location: Arlington WA
Posts: 1,728
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Re: Make it handle
i just grabbed 1 ton coils, some belltech nitro drop shocks and a 7/8" rear bar from a tahoe. if i dont like the shock, o well. they were used and dirt cheap
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GMC C15 355 SM465 3.73 80 C10 cruiser build thread 79 short stepside crew cab. big and ugly. build thread |
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#1636 | |
Registered User
![]() Join Date: Apr 2008
Location: San Diego California
Posts: 1,316
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Re: Make it handle
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I'd rather attempt something great and fail.. than try something ordinary and succeed. Norman Vincent Peale Project: Barn Raising http://67-72chevytrucks.com/vboard/s...d.php?t=414961 Project: 30 Be Low https://67-72chevytrucks.com/vboard/...d.php?t=830583 |
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#1637 |
Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: Make it handle
1 ton coils supposed to be a good budget upgrade?
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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#1638 |
Registered User
Join Date: Sep 2007
Location: Wichita Falls, Texas
Posts: 459
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Re: Make it handle
Okay, I've read the whole thread a couple times. Now my question...On an 82 Blazer with a stock crossmember, lower arm moved 3/4", 1 coil cut 6102 springs, 1.25" swaybar,engine lowered slightly and poly bushings what front shocks/mounts would you recommend? Its gonna be a weekend cruiser nice day driver occasional autocrosser kinda truck. I don't mind spending money on quality but don't have an unlimited budget...
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#1639 | |
Registered User
Join Date: Sep 2007
Location: Wichita Falls, Texas
Posts: 459
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Re: Make it handle
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#1640 | |
Senior Member
![]() Join Date: Jul 2010
Location: Dandridge, Tn. USA
Posts: 2,226
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Re: Make it handle
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GoodGuys 2012 Pro-Truck Champion ![]() 2012 Truckin' Throwdown Champion GoodGuys 2011 National Champion ![]() 2011 Truckin' Throwdown Champion GoodGuys 2010 National Champion ![]() Proud to put our products up against all others! |
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#1641 | |
Senior Member
![]() Join Date: Jul 2010
Location: Dandridge, Tn. USA
Posts: 2,226
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Re: Make it handle
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GoodGuys 2012 Pro-Truck Champion ![]() 2012 Truckin' Throwdown Champion GoodGuys 2011 National Champion ![]() 2011 Truckin' Throwdown Champion GoodGuys 2010 National Champion ![]() Proud to put our products up against all others! |
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#1642 |
Senior Member
![]() Join Date: Jul 2010
Location: Dandridge, Tn. USA
Posts: 2,226
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Re: Make it handle
Race report Chris 'Smitty' Smith, of Smitty's customs won the Pro class at the GoodGuys show in Springfield Mass last weekend. Chris' bad ass C10 runs No Limit suspension with RideTech shocks and Shockwaves out back, Yes, it's on air. After the win in Colorado from the HellBoy C10 a few weeks ago, that makes two pro class wins for C10's this year. More are coming!!
Nashville are you close? July 5,6,7 is the ASCS "Run to music City". They are trying to boost Truck participation. The Guys from "Trucks" TV will be there running their new Ranger project and doing some filming. Go check it out.
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GoodGuys 2012 Pro-Truck Champion ![]() 2012 Truckin' Throwdown Champion GoodGuys 2011 National Champion ![]() 2011 Truckin' Throwdown Champion GoodGuys 2010 National Champion ![]() Proud to put our products up against all others! |
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#1643 | |||
Registered User
Join Date: Jun 2012
Location: Northwest, MO
Posts: 21
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Re: Make it handle
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Tyler Gibson There's nothing like building up an old automobile from scratch and wiping out one of these Detroit machines... That'll give you a set of emotions that will stay with you... Know what I mean? Those satisfactions are permanent... |
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#1644 | |
Registered User
Join Date: May 2005
Location: Beaverton, OR
Posts: 3,728
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Re: Make it handle
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__________________
New Project: 1966 LWB C20 Plans: 1/2 ton conversion Dropmember front Dropmember rear Corvette discs Restored raised bed http://67-72chevytrucks.com/vboard/s....php?p=4295210 |
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#1645 | |
Senior Member
![]() Join Date: Jul 2010
Location: Dandridge, Tn. USA
Posts: 2,226
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Re: Make it handle
Quote:
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GoodGuys 2012 Pro-Truck Champion ![]() 2012 Truckin' Throwdown Champion GoodGuys 2011 National Champion ![]() 2011 Truckin' Throwdown Champion GoodGuys 2010 National Champion ![]() Proud to put our products up against all others! |
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#1646 |
Senior Member
![]() Join Date: Jul 2010
Location: Dandridge, Tn. USA
Posts: 2,226
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Re: Make it handle
Lately we have been experimenting with "Tread Width". Meaning, the total width, outside-to-outside of the tire track. This is a bit different than "Track width" which would be center of the tire tread-to-center of the tire tread.
For our testing we are using the HellBoy, which runs a 315/30/18 on all four corners. So the difference between the front and rear tread width is the same as the track width difference. At the moment, the front total width is 73" and the rear is 71". So the front is 2" wider than the rear. The truck has a slight push on corner entry, and can sometimes be loose on the corner exit. So, here is the question. (we can adjust the width very easily) We can set up in 5 tread width stances. they are: A. Front 2" wider B. Front 1" wider C. Even front/rr D. Rear 1" wider E. Rear 2" wider To be fair, this testing will take a few weeks, We need to compile multiple lap times under somewhat similar conditions. So here is the question, What do you think will happen, and why?
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GoodGuys 2012 Pro-Truck Champion ![]() 2012 Truckin' Throwdown Champion GoodGuys 2011 National Champion ![]() 2011 Truckin' Throwdown Champion GoodGuys 2010 National Champion ![]() Proud to put our products up against all others! |
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#1647 |
Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,932
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Re: Make it handle
That is interesting Rob, I remember years ago we built a purpose built car in college, we competed in Formula SAE. Anyway we decided to build this to the minimum lengths required for the A-mod class so we could race it in Autocross in this class. We built the "tread width" wider in the front than the rear. Our thinking was on the slower autocross courses we could turn-in very tight to the cones on the front and the rear would be just on that edge instead of being wider. We did very well with that car that year in competition. But that was a light race car with a great power to weight ratio and front to rear ratio. Plus good drivers.
My initial thought would be on your truck you will get less push the wider this tread width is. On the extreme if you are very narrow instead of turning it would most likely be like a pivot being more likely to push thru the corner, again that would be an extreme like a trike? that's my thought... will you be changing this width with spacers?
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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#1648 | |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: Make it handle
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#1649 |
Registered User
Join Date: Apr 2013
Location: Lawrence, KS
Posts: 11
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Re: Make it handle
Custom 68 I agree with you... Keep the front wider. Before I read your response I went through the thinking and it's clear to me I'd rather autocross a Morgan 3 wheel than a mc trike. Whether this checks out in the real world with small differences. Remains to be seen.
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#1650 |
Registered User
Join Date: Apr 2013
Location: Lawrence, KS
Posts: 11
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Re: Make it handle
Also, much progress on my F-1 over the last number of weeks. The trailing arm set up is done (coil-overs, fat panhard, added rear crossmember, and some angled tubing bracing to stabilize the rear frame section...). Have yet to install the Firm Feel steering box/fast ratio pitman/ 1-1/4" sway bar.
I will post some photos soon. Posted via Mobile Device |
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