traction issues still relevant - Page 2 - Yellow Bullet Forums
;

Go Back   Yellow Bullet Forums > Technical Section > Stock Suspension

Reply
 
Thread Tools Display Modes
Old 08-03-2019, 06:52 PM   #16
3 window
Senior Member
Smoked another BBC
 
3 window's Avatar
 
Join Date: Nov 2011
Posts: 1,277
Default

Just last weekend I went 1.5 in sixty and ran 6.5 @ 108 on a 275/60 Nitto and I’m sure I could’ve gone a 1.4x, but ran out of runs. I run em at 15 psi. You’ve gotta get the weight on the back tires and also need a decent amount of power to keep it there. Most of making them work is in the shocks, not gonna lie. I’ve actually gone 1.7 in sixty on a backroad, no burnout or anything (I run a Vbox to verify). I had a hard time getting them to work with single adjustable shocks. When I went to doubles it was night and day. I’ve got Vikings front and rear. There are probably better shocks out there, but for what I’m doing they work great.
3 window is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-03-2019, 07:38 PM   #17
SuperStockAMX
Junior Member
Spooled up
 
Join Date: Oct 2015
Location: Arizona
Posts: 223
Default Re: traction issues still relevant

I just watched the last 3 posted video’s.
Notice there is a bog on all launches?
Why is the front so high at static height? It’s to high. What spring is on the front? It’s too stiff.
Is there any weight in the trunk?
__________________
1970 AMC AMX 390
NHRA SS/H
Advanced Clutches
Redline Racing Cams
4300 Autolite
SuperStockAMX is offline   Reply With Quote
Old 08-04-2019, 12:48 AM   #18
coppercutlass
Junior Member
Launchin
 
coppercutlass's Avatar
 
Join Date: Nov 2013
Location: Elgin Il.
Posts: 386
Default Re: traction issues still relevant

yeah im still working on the bugs on the carb. its not as bad as it was but it needs work slowly but surely getting there. Learning as I go. The cars ride height is pretty much stock. I think the videos are a bit deceiving but its close to stock. This is still a street driven car so I wanted it to be able to clear stuff and without getting into a lengthy explanation it starts at my drive way. Its a quick steep entrance that flattens out .

there is no weight or ballast in the rear. But I plan on putting the car on scales as I know the rear end of the car is light.


the front springs are 6 cyl. tempest springs . They settled in ok but I might cut a coil out to drop the nose a bit.
coppercutlass is offline   Reply With Quote
Old 08-04-2019, 01:01 AM   #19
coppercutlass
Junior Member
Launchin
 
coppercutlass's Avatar
 
Join Date: Nov 2013
Location: Elgin Il.
Posts: 386
Default Re: traction issues still relevant

static height parked is pretty much level. Do you mean going down the track static height ?
coppercutlass is offline   Reply With Quote
Old 08-04-2019, 03:09 AM   #20
SuperStockAMX
Junior Member
Spooled up
 
Join Date: Oct 2015
Location: Arizona
Posts: 223
Default Re: traction issues still relevant

Static...as in just sitting there on a level surface.
Personally, I would want a softer spring. If it sits like that and you have a 6 cylinder spring, then I would guess there is weight removed from the front end?
I would buy a pair of Moroso springs, same as for a Chevelle I assume. You need to see some rise on the front at launch. Maybe you’ll have to back into the driveway! LOL
All-in-all, can’t complain about a 11 second street car.
__________________
1970 AMC AMX 390
NHRA SS/H
Advanced Clutches
Redline Racing Cams
4300 Autolite
SuperStockAMX is offline   Reply With Quote
Old 08-04-2019, 10:58 AM   #21
makinchips
Senior Member
Smoked another BBC
 
makinchips's Avatar
 
Join Date: Feb 2009
Posts: 1,987
Default Re: traction issues still relevant

You want to try lower the rear quarter panel to 3'' above the rim and level the front end to that.
makinchips is offline   Reply With Quote
Old 08-04-2019, 10:30 PM   #22
coppercutlass
Junior Member
Launchin
 
coppercutlass's Avatar
 
Join Date: Nov 2013
Location: Elgin Il.
Posts: 386
Default Re: traction issues still relevant

I may lower the car 2 inches. All in all im happy with the way the car is running 11.89 with a small block 355 olds on pump gas aint too bad. Just want it to not spin. Ideally there is a lot of things I need to do to make this car an efficient race car but in many ways it will take some of the traits I want. I have jumped in this car and put on 100 miles in one evening. Finding a balance is the hard part.
coppercutlass is offline   Reply With Quote
Old 08-04-2019, 10:36 PM   #23
coppercutlass
Junior Member
Launchin
 
coppercutlass's Avatar
 
Join Date: Nov 2013
Location: Elgin Il.
Posts: 386
Default Re: traction issues still relevant

I tried to load a picture. I fucking give up. this is the hardest site to load pics to FML
coppercutlass is offline   Reply With Quote
Old 08-05-2019, 09:40 AM   #24
makinchips
Senior Member
Smoked another BBC
 
makinchips's Avatar
 
Join Date: Feb 2009
Posts: 1,987
Default Re: traction issues still relevant

How big a tire do u use?
makinchips is offline   Reply With Quote
Old 08-05-2019, 11:50 AM   #25
Adobedude
Senior Member
Smoked Another SBC
 
Join Date: Mar 2009
Location: Corrales, New Mexico
Posts: 6,313
Default Re: traction issues still relevant

Quote:
Originally Posted by coppercutlass View Post
I tried to load a picture. I fucking give up. this is the hardest site to load pics to FML
No shit.
__________________
2017 New Mexico Mopar Challenge Series Champion.
Adobedude is offline   Reply With Quote
Old 08-05-2019, 04:12 PM   #26
coppercutlass
Junior Member
Launchin
 
coppercutlass's Avatar
 
Join Date: Nov 2013
Location: Elgin Il.
Posts: 386
Default Re: traction issues still relevant

@ Making chips im running a 28 x10 hoosier mounted on a 15x10. I was thinking about this. Is it possible to have too much extension ?

In this video which was cut short by my wife . haha. you can see how the car sits if I don't bring the RPMS up. IN the other 2 videos I was bringing up the RPMS up and was already into the suspension travel. Still trying to find that sweet spot. I also really needed the RPM to help that flat spot off the line.

Again guys thanks for all the help and suggestions. This is big learning curve for me.

coppercutlass is offline   Reply With Quote
Old 08-05-2019, 08:27 PM   #27
3 window
Senior Member
Smoked another BBC
 
3 window's Avatar
 
Join Date: Nov 2011
Posts: 1,277
Default

The suspension needs to be “neutral” if at all possible when you leave. Brake torquing can take away suspension effectiveness for sure.
3 window is offline   Reply With Quote
Old 08-06-2019, 12:26 AM   #28
coppercutlass
Junior Member
Launchin
 
coppercutlass's Avatar
 
Join Date: Nov 2013
Location: Elgin Il.
Posts: 386
Default Re: traction issues still relevant

Perhaps once I fix my carb issues I can launch off a high idle like say 1100 .
coppercutlass is offline   Reply With Quote
Old 08-06-2019, 01:25 AM   #29
SuperStockAMX
Junior Member
Spooled up
 
Join Date: Oct 2015
Location: Arizona
Posts: 223
Default Re: traction issues still relevant

what carb is it? Fuel pressure?
__________________
1970 AMC AMX 390
NHRA SS/H
Advanced Clutches
Redline Racing Cams
4300 Autolite
SuperStockAMX is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-06-2019, 11:52 PM   #30
coppercutlass
Junior Member
Launchin
 
coppercutlass's Avatar
 
Join Date: Nov 2013
Location: Elgin Il.
Posts: 386
Default Re: traction issues still relevant

Fuel pressure is good . Its a 750 HP. I may have mentioned before The AFR is good all across the board except when it transitions from idle to WOT , crusing to WOT . Pretty much any time the throttle is cracked hard the AFR Goes lean and I have been messing with it here and there. Its been a really busy summer and last time at the track the stumble was present but not nearly as bad so im headed in the right direction ( or so I think) . I messed with pump cams , went up with the shooters., Many said the 50cc accelerator pumps would not be needed but it sure seems like im running out of volume very fast with the more aggressive cams. With the less aggressive cams the fuel duration seems to last a little longer and I saw the AFR not go super lean. IM gonna try a 50 CC pump on the primary side and see what happens.
coppercutlass is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -4. The time now is 07:31 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 0%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Yellow Bullet LLC
 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.