I have just swapped over to rms upper control arms and calvert 90/10 shocks to improve 60ft times. Last weekend i took the car out , the launch was a lot more aggresive, front end rises very quickly but car is loosing 60ft.
I managed to find a pic of the car on the net and it appears to be squashing the tyres a lot.
Car runs 9 way ranchos and ss springs, new 31X10.5 Hoosiers, 4.56 gears.
Car was running 1.53 60 ft's down from 1.48-1.50.
What pressures should i try, have been running 8 to 10, i'm thinking of going to at least 12 and stiffening the rear shockers up a lot.

Hi Mick do the slicks have tubes?
Is it leafs or ladders?
You can try 10 psi and go up in 1/2 psi increments until it spins, then go back to last it didn't spin.
More info, launch rpm, transbrake?

Do you have frame connectors?
Don

I'm running 12.5 lbs in 29.5x10.50s. Ranchos on #7. Also running Calvert 90/10s.

I have nearly 5" of front end travel. Didn't work nearly as well until I got it there.

30x10.5 with tubes @ 14.5 to 15 psi

HI Don
I have frame connectors, footbrake off the converter, around 3000 i think, ss springs with clamps on the front, yes i run tubes, car with me 3200lbs
1st Run on sunday tried shocks set on 5, 10psi, second and third, 8 psi shocks on 3 and 4 psi respectively.
Points of note, when i fitted the dana, i moved the axle back an inch and dropped the rear down, also my old M/T slicks were stiffer side walls.
Vernmotor
I'm thinking of trying at least 12psi and shocks around 7, what 60ft and times does your car run?.
ab7fh
I have around 5" of travel, the lower bump stops are cut right down to around 1/2".
Ideally i want to be were you are, between 1.40-1.42.
Mick

my car is very similar to yours deaks-- but a 10.5 x 29.5 , no tubes. i usually run 12-13lbs in mine , its went 1.41 with the ss springs and a home-made snubber . my dana rear is also moved back an inch.

have you tried a pinion snubber?

Yeah, i always follow your posts for that reason.
Has it gone 1.41 footbraking it.?
I haven't had a snubber on it for 15 yrs, do you think it would help?.
Mick

AS soon as i get video, i will post it, in the mean time more advice would be appreciated.
Mick

I think the best advice at this time is to get more air in your slicks. I tried pressures as low as you're running and it didn't do a thing for me. Wadded up the tire, which eats up some of the cars reaction time and didn't provide as good of traction as with the higher pressures.

transbrake / 1.41 - 1.44 , SS with ranchos.

i would say try a snubber---i cant hurt , it DID help my car.

if you cant find one for a Dana tall enough, fab one up -just make a factory one taller

I wonder if your losing time with front end lift vs moving the car forward.

Mick
We've gone over my combo before however,
I run 29.5x11.5 with 12-12.5psi (works best for my combo).

Looking at your photo seems to me you do need more air in the rear tires.
Also what kind of angle is your rear shackle at? I run an agressive layed down angle. From my experience this hepls promote dynamic rise in the rear, thus planting the tires. JOM though

Oh, one more thing, don't think a snubber is going to help with your issue. Really not needed.
Best thing I ever did was pitch the snubber and put QA-1 shocks on the rear, footbrake 1.389 60' @ 3325#

Mick, we were tuning our launch a little at the weekend at the pod (not a good thing to do when your running in brackets I know) We had 12.5 psi cold and we need more looking at the photos. We got it down to a 1.37 when the front touched before the 60ft lights and 1.48 when they didn't. Car wants less ext damping and more compression damping at the front along with more rear tyre pressure, lots of wadding on launch and darker at the edges on the contact patch.
We're just creeping up on it as a friend of ours with caltracs got all 4 wheels off the floor this weekend and had some damage

The hoosiers are definitely softer than the M/T's, however they were at least 8 yrs old but still ran a 1.46 on the car last year.
Since fitting the control arms and calvert shocks, it's dramatically improved the front end rise.
Greg
I was always led to believe ss springs dont need a snubber because of the short front section.
The angle of the rear hangers, is as shown in the mopar chassis book.
Tig
I am going to the pod in a couple of weeks, i am going to stiffen the shocks up to at least 7 and start with around 12 psi.
Your car is making far more power than mine, i cant see all four wheels coming off the ground on mine, oh and well done on the 60ft improvement.
Mick

Id like to post some real track data (im not a keyboard racer) ---this is my experience , i race and keep a log book.

MY car DID improve with a snubber. it was going around 1.49 - 1.51 or so on an average day ....... and after the snubber was installed it was going 1.46-1.49 . It seemed to help and make the 60 more consistent. the weather was similar--no other changes.


Thats the end of the story--no argument needed--it worked.

most of the above passes were in crap weather (normal in iowa) .

My point is , a pinion snubber may or may NOT work on YOUR car-----its worth a try . It sure seemed to help MY car.

I wouldnt sit here and say so if i couldnt offer a possible enhancement to your car .


(and no--i dont sell pinion snubbers--i made mine)

I'm sorry Kevin, i was just making an observation and i do value your contribution to this thread along with everyone else who has replied.
If i had all the answers i wouldn't be on here asking for help.
BTW, Judging by the time difference you must have match sticks holding your eye lids open.
It's 10 am here
Mick

oh--no worries mate !! just tryin to help--



yes-my hours are weird plus i get insomnia on top of that

Quote:

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yes-my hours are weird plus i get insomnia on top of that

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Usually on the starting line!!

Yes...I do!! Sorry for the hi-jack,Mick!! I hope you get it fixed!!