Looking for some help with my 60 fts without going full drag suspension - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 24 Old 07-01-2017, 10:54 PM Thread Starter
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Looking for some help with my 60 fts without going full drag suspension

Cars makes 600rwhp and weighs 3590 race weight.my current setup is tokico illumina 5 way struts and shocks,eibach prokit springs,steeda lower rear control arms with stock uppers.on 26 in slicks or drag radials i get 1.70s lauching around 4k rpm.i have some rear adjustable uppers i might try along with new struts and shocks but looking for something that still provides good street manners


96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #2 of 24 Old 07-06-2017, 09:13 AM
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Disconnect your front swap bar just for the track if you haven't already. Keep the front struts on full loose and the rear either half way or a little of the stiff side.

-Mark


98 red cobra (N/A 5.4)
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post #3 of 24 Old 07-06-2017, 09:19 AM
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You might look into some adjustable upper control arms, then set your pinion angle. I set mine -3-5 deg.

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post #4 of 24 Old 07-06-2017, 10:11 PM
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I just posted a thread about making any changes to my setup, I'm at about 650hp through a 3650(hahahaha!) stock rear suspension stock rear end and 275 s/s radials and cut a 1.3 60' launching at 3500rpm. Are you spinning, bogging? I am living proof you should definitely be cutting a 1.4/1.3 time, then resulting in your 10sec pass!
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post #5 of 24 Old 07-07-2017, 08:54 AM Thread Starter
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Will try disconnecting the front sway bar next time out.will put my rear upper adjustable arms in and see what it does.
Crucial,what is your setup and what does your car weigh and do you use a 2 step?

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #6 of 24 Old 07-07-2017, 10:37 AM
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Never had it weighed, gutted 04 gt, no 2-step. I'm using upr's front kit with qa1 shocks.
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post #7 of 24 Old 07-08-2017, 10:02 AM Thread Starter
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What setting do you run on the qa1 shocks ?i was thinking about trying those with my steeda rear upper adjustable arms.

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #8 of 24 Old 07-08-2017, 11:29 AM
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Complete loose, i was looking to take a bunch of shock out of the ride with how stiff the front springs are.
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post #9 of 24 Old 07-10-2017, 01:56 PM
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Quote:
Originally Posted by vortech gt View Post
Cars makes 600rwhp and weighs 3590 race weight.my current setup is tokico illumina 5 way struts and shocks,eibach prokit springs,steeda lower rear control arms with stock uppers.on 26 in slicks or drag radials i get 1.70s lauching around 4k rpm.i have some rear adjustable uppers i might try along with new struts and shocks but looking for something that still provides good street manners
Stock springs will do a better job of transferring weight then lowering
springs.

427 T56 3.90 2 kits
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post #10 of 24 Old 07-10-2017, 04:59 PM
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Is it the progressive spring rate or the fact that it's overall taller spring? I'd like to lose a couple inches out of ride height but not if I'd sacrifice performance.

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post #11 of 24 Old 07-10-2017, 07:01 PM
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It's taller softer,getting the front to rise quickly. Your average moderate power street car needs lots of movement. A hard hooking track car is a different animal.

427 T56 3.90 2 kits
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post #12 of 24 Old 07-12-2017, 09:42 AM
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What tire you on?? Something not right for sure.

My 83 Tbird is 3600lb and only makes 400 at wheels and pulls 1.61-1.66 every pass. Replacement KYB shocks n struts, SN95 coils, all stock GT sway bars hooked up,stock rear lowers, CHE adjustable uppers set to -2 and I use ET Street R 26x10.5 tires.

This was a 1.61 60ft

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post #13 of 24 Old 07-12-2017, 10:31 PM Thread Starter
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I'm on a 26*10 et drag stiff side wall.i think will a higher launch and less tire pressure it should 60ft much better.that was the first and only pass on the car so I'm sure it will get better with seat time

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #14 of 24 Old 07-12-2017, 10:39 PM Thread Starter
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I have to figure out the sweet spot with the new viper t56 with a 2.66 1st gear.i run 4.10gears

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #15 of 24 Old 07-13-2017, 12:39 AM
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That would be an interesting thought. With 1st gear, that rear gear, and a 26" tire, what kinda mph are you hitting? I did a little research on shift points using my dyno chart and plugged it into a formula to help me choose a taller tire with stock gear. There seems to be some trade off with 60' and big end mph.
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post #16 of 24 Old 07-13-2017, 08:06 AM Thread Starter
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Mph was 126,i shift at 6k but was going through the traps at 6500.

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #17 of 24 Old 07-13-2017, 01:31 PM
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x2 on disconnect swaybar
dont expect much from lowering springs
have a spotter check where you launch to see if your slightly spinning 1 tire faster
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post #18 of 24 Old 07-30-2017, 09:28 AM Thread Starter
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Update.found out that both my rear lower control arms were broke.my rear sway bar completely broke of from the welds where the mounting tabs are.also found some hairline cracks in the control arms.i replace the stock uppers with some adjustable uppers and went with some qa1 lowers.just have to get the pinnion angle dial in now.

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #19 of 24 Old 07-31-2017, 12:13 PM
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Wow, steeda lower control arms broke at the welds? That would definitely hurt it!
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post #20 of 24 Old 07-31-2017, 09:18 PM Thread Starter
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Yup
Last couple of weeks people were telling me that my rear sway bar look really low.turned out to be broken sway bars.picked the car up today and with the new lower and upper control arms the car feels more planted in the rear.

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #21 of 24 Old 07-31-2017, 09:53 PM
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Awesome! Glad to see you got it lined out! Hopefully you'll post up some better 60's next time!
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post #22 of 24 Old 08-01-2017, 02:36 AM
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126 MPH you should be a solid mid-10 once you get it dialed in. Iím a leaf spring, manual trans racer so I donít know the Mustangs (yet; father / son project in progress) but itís imperative the front is able to rise as quickly as possible; if not quicker than possible. No sway bar, loose strut adjustments, front coils that are taller than stock with a thinner wire diameter. Definitely no to any kind of ďhandlingĒ springs! If you get real serious, low resistance control arm bushings; no to prothane or similar ďhandlingĒ bushings!
Rear-end must have negative pinion angle. Donít know angle what works best for stock-type Mustang rear suspension but, I would guess -3 to -4 degrees.
What clutch are you using? Thatís a critical issue that has not even been brought up yet. I assume you have a manual trans as you mentioned 40000 RPM launch and I see no mention of a tranny brake.
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post #23 of 24 Old 08-02-2017, 06:39 PM Thread Starter
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T56 6 speed with a mcleod twin disc clutch.it does have eibach lowering springs but people get in the 1.50s with similar springs.I'm expecting some 1.50s next time out now that I've added a 2 step.

96gt,svo intake,svo heads,mhs blower cams strim(2.65)pulley, IW 10% crank pulley,AFM powerpipe,60's,full fuel system,
sct2600,bbk longtubes & h pipe,4.10'water methanol.
new numbers 602rwhp,[email protected] at 3590 lbs.
best et [email protected]
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post #24 of 24 Old 08-02-2017, 07:27 PM
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I agree, with enough adjustments you might get those springs to work, just understand it will never be optimum with handling springs. Canít have both great handling and a great drag race launching car! The real issue is that clutch. It has way to much pressure for 600 HP on small 26Ē slicks. And being a Diaphragm set-up, itís all or nothing on the launch and if it getís to hooking up; a parts breaker.
I used to run a McLeod dual 8Ē ďMag ForceĒ (also a diaphragm clutch) back when I was running 10.70ís-10.80ís as I recall and there was a way to adjust the base pressure. Seems I raised it to +.135Ē and finally got tired of pulling the bell housing off to make the adjustments. I had it working pretty good but others I know with similar power (about 525 HP back then) were taking out one of the 8Ē disks and going faster.
The problem with running a non-adjustable clutch is you are forced into lower RPM launches in order to keep traction. That of course pulls the engine down to far once you engage the clutch.
I know of an adjustable diaphragm clutch coming to market soon. It would probably help a lot and would still be considered a street / strip clutch.
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