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#1 |
Registered User
Join Date: Mar 2010
Location: Canada
Posts: 73
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'71 GMC Track Day Video
Thought you might enjoy this video I shot in the summer.
It's my '71 GMC Longbox, rocking a LS427/t56, a basic lowered suspension, stock front brakes with HP+ pads and Willwood rears. It's more fun than the video shows. https://vimeo.com/79890973 Cheers, bovey Last edited by bovey; 11-21-2013 at 08:46 PM. Reason: nasty spelling - yikes. |
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#2 |
Registered User
![]() Join Date: Apr 2013
Location: San Antonio TX
Posts: 424
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Re: '71 GMC Track Day Video
Awesome.... Ive been into the AWD Subaru scene for the past 10 years. Track day any day in anything is cool! Great vid!
Eric (Evaded)
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If I see a Zombie.. Im runnin it over with my Truck. |
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#3 |
Registered User
Join Date: Mar 2001
Location: RADFORD, VA
Posts: 2,651
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Re: '71 GMC Track Day Video
Pretty Cool, I liked the different camera angles.
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1964 BBC 402 4x4 ![]() ![]() ![]() ![]() |
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#4 |
Registered User
Join Date: Feb 2011
Location: North Carolina
Posts: 993
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Re: '71 GMC Track Day Video
Thats awesome!!!
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#5 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Nice video man. Cool seeing a LWB truck dooing that!
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#6 |
Registered User
Join Date: Mar 2010
Location: Canada
Posts: 73
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Re: '71 GMC Track Day Video
Thanks guys. I had no idea how it would work on a track, this was my first time out, other that autoXing. I'm hitting 110 mph + is a few areas of the video, did not expect it to work as well as it did with such simple suspension and brake upgrades. However, I was at the limit of my talent and suspension this day...
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#7 | |
Registered User
Join Date: Jul 2013
Location: Rockwell, NC
Posts: 1,639
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Re: '71 GMC Track Day Video
Quote:
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1970 C-10 LWB "Blu" Instagram (current build pictures) 70_nc_c10 |
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#8 |
Senior Member
![]() Join Date: Jan 2012
Location: Texan, back in TX
Posts: 2,153
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Re: '71 GMC Track Day Video
Cool video. I like your other video too that discusses your trucks setup. I know you said it's the standard 4/6 drop but I was wondering, do you have a c-notch in the rear and is the 6" drop all spring or a combination of springs and blocks.
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#9 |
Registered User
Join Date: Nov 2012
Location: Spanish Fork Ut
Posts: 370
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Re: '71 GMC Track Day Video
What he said. lol. Also what wheel/tire size you running?
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" Dead Pumpkin" 67 Chevy short bed, 292 I6, 4spd manual. Fan of the "Slant Noses". ![]() 93' Toyota pickup 2WD 2dr and 32mpg. Daily driver. 300k+ Members I've met... Mister-B |
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#10 |
Registered User
Join Date: Mar 2010
Location: Canada
Posts: 73
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Re: '71 GMC Track Day Video
Wheels are 18 x 9s with 5" back spacing - actually they are cheapo rock crawling wheels for a 2000s Jeep - they used 5 on 5 - who knew?
Tires: Front - 255/35/18 Toyo 888 - stiff side wall Rear - 275/40/18 Toyo 888 I want a different wheel and tire combo, but this was cheap. |
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#11 |
Registered User
Join Date: Jul 2011
Location: Poteau, Ok.
Posts: 100
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Re: '71 GMC Track Day Video
I like the "Trucky takes on autocross school. FUN." video too.... looks like a blast!!!
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#12 | |
Registered User
Join Date: Mar 2010
Location: Canada
Posts: 73
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Re: '71 GMC Track Day Video
Quote:
Anyway, the rear suspension in all it's glory. 4" Chrisholm drop springs 2" homemade blocks ECE shock re-locater kit - from when they first made them. CPP pan bar - stock location Beltech Nitrodrop shocks CCP C-notch kit That it, and I chase down some crazy new AWD with it. This will be getting replaced moving forward as it's heavily taxed on my race days - this year was just sorting out if I liked autoXing/track days or not. NC John, the video is 2 laps of the DDT track, however, yes - the monster track at Mosport is on my list to hit next year. My truck is way too fast, and way under suspensioned (new word) for those kind of speeds. I was even holding back on the DDT (Driver Development Track) to keep the paint side up. |
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#13 |
Senior Member
![]() Join Date: Jan 2012
Location: Texan, back in TX
Posts: 2,153
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Re: '71 GMC Track Day Video
What's getting replaced? The truck or the rear end setup? What's causing you to be heavily taxed. Sorry for the odd question. I'm an AutoX noob.
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#14 | |
Registered User
Join Date: Mar 2010
Location: Canada
Posts: 73
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Re: '71 GMC Track Day Video
Quote:
In my case, speed combined with the types of racing I'm doing is more than what my current suspension was ever designed to handle. Mix that with a race track that allows for a ton of speed and it can be dangerous. A lot of the autocross you see at car shows are designed to keep the competition around 35 MPH - no helmet stuff. That is not the case with the groups I run with up here. 90% of my competition are Miatas, S2000s and Subarus and they are fast and nimble. To be able to compete with them I need to build a very specific chassis to be nimble and deal with all of my power, as I run a LS 427 making 600ish HP with a brick torque curve. My design criteria for the next version of my truck must be: 1) Nimble to deal with tight autocross designs. i.e. front IFS with excellent caster/camber adjustment 2) Stable for high speed track use. Not to mention the idea of doing Cannonball Run style road rallies... but that is off in the future. Who doesn't love the Big Red Camaro? Inspiring car. |
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#15 |
Registered User
Join Date: Nov 2012
Location: ravenwood, mo
Posts: 709
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Re: '71 GMC Track Day Video
That looks like a dream come true! Awesome video!
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#16 |
Registered User
Join Date: May 2013
Location: Central NC
Posts: 830
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Re: '71 GMC Track Day Video
That's awesome!!!
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1972 Cheyene C-10 "Ole Green" My Grandfathers truck (early 70's to 1983) My first vehicle (1983) Original 350 (3 rebuilds) 700R4 from Bowtie Overdrives ![]() |
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#17 |
Registered User
Join Date: Mar 2010
Location: Canada
Posts: 73
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Re: '71 GMC Track Day Video
Autocross school was a fun week-end. We had no idea what would happen and it worked amazing.
BUT, please note there have been two big changes between "Trucky takes on Autocross School" and "Trucky takes on DDT": 1) Full 14:1 AGR race box, custom built, custom valved, with matched AGR pump and power steering fluid cooler. Look into AGR before buying a stock replacement, their products are amazing and the prices are great for race proven parts. 2) 12.19" Willwood rear discs with 4 piston callipers, Willood 1" MC and the stock front brakes have HP+ pads. I also run a rear 10lb residual valve as a cheap bandaid to solve the typical GM rear-end pad knock back. |
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#18 |
2WD Jimmy
![]() Join Date: Mar 2005
Location: Davis County, Utah
Posts: 2,564
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Re: '71 GMC Track Day Video
I also run a rear 10lb residual valve as a cheap bandaid to solve the typical GM rear-end pad knock back.[/QUOTE]
What is pad knock back? |
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#19 |
Registered User
Join Date: Mar 2010
Location: Canada
Posts: 73
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Re: '71 GMC Track Day Video
[QUOTE=What is pad knock back?[/QUOTE]
Pad knock back occurs when you have end-play in your rear-end that pushed the disc brake pads off the rotor (even a few 1/1000ths) - the result is a spongy petal. It is very common with GM c-clip rear-ends when you put fixed callipers on. Worse yet, the pads are always pushed back in varying amounts (depending on cornering force) so you never have any clue how spongy the petal is going to be. Kinda annoying when your heading into a 180 corner at 100 mph. If anyone is considering doing a disc brake conversion, you should understand this issue - or it will cost you time and money. As I said, a residual valve is a bandaid fix, a proper fix would be a floater rear-end, floater callipers, or a c-clip eliminator kit, but it must be a "circle track" not a "drag racing" c-lip eliminator kit. This is a huge subject - I'll post a new thread on the topic and expand on the proper solutions. I don't want any of you to go through what I did. |
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#20 |
Registered User
Join Date: Oct 2013
Location: Salt Lake City, UT
Posts: 117
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Re: '71 GMC Track Day Video
That's sweet! I'd be pretty intimidated to see that thing coming up on my rear.
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2006 Z06 2013 Cruze |
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#21 |
2WD Jimmy
![]() Join Date: Mar 2005
Location: Davis County, Utah
Posts: 2,564
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Re: '71 GMC Track Day Video
GREAT info, and a really fun video. Thanks Bovey!
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#22 |
Registered User
Join Date: Oct 2013
Location: Northern Ca
Posts: 71
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Re: '71 GMC Track Day Video
Great video!!
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