Steve.k (Login steve.k) Member from IP address 220.127.116.11
Well I had new step headers built and the guy talked me into full system with 3.5 tailpipes. The track was a little slick for hooking and the DA measured 5800ft. The car ran almost as quick as open headers at 11.4 @ 119.14. The previous bet was 11.28@ 119.4. I beleive the system added over 100 lbs to car so hp is probably upI noticed the 60ft was down a bit probably what affected the et also. Might have to add a little wider slick as cannot come off line any harder tha 3500 with 9" tire.
We run all our race cars with mufflers. No reason to be that loud, really. But it does sound good. I actually like how ours sound with the Dynomax Bullets better than open pipes. You can think better as a driver and it doesn't hurt HP at all. Lots of Borla units on the really fast dragsters. There are a great many tracks where it is required, along with time curfews.
Falcon I was a bit skeptical when the guy figured we should run tail pipes and mufflers? But the car ran within .3 of a mph. The et was down some but the track wasn't hooking as good. 60ft was slower by .08? The added weight likely brought et down a smidge also. The engine seems Way smoother and it does have a nice tone. I received many nice compliments as I was the only cougar and only ford older than 81. I guess on one run it pulled the drivers side tire by about 6"? Then unloaded the back end? Thought I broke something so I let off but still ran 118. It's coming I'm going to work on susp and see if I can crack the illusive 10.99 with the big girl. When I tell people it's a 400 block the nearly fall over in disbelief. I tell them it's the unsung Cleveland !
Ive been checking the size of the mt 29.5x10.5 slicks as my 9" ers maybe a little to small for this heavy tub! I do have subframe connectors,roll bar , and monte Carlo braces. The car does spin quite easily anything over 3500 so it may need bigger tires. I do have the slide-a-link bars also that really helped car hook. My fenders are tight so I'll check the clearence for wider meats. I guess a tenth off 60ft is two up top so that's a big gain.
Wide at that power level won't do anything and might take some out. Tall slick has a bigger contact patch. Run as much air in them as you can. My 28s like 13. Every car is a little different in what it likes, even with the same wheel/tire combo.
If your current suspension setup is kinda limited on how much you can really adjust it for better hook, (& also don't have room for bigger slicks), you could always get a MSD digital 7 box. The Digital 7 box will allow you to program in a short little ignition retard ramp during the launch for a set amount of time to help get the car to hook better.
Or you could spend the big bucks and get active real-time traction controll with a Davis box.
Well I never thought much about delay boxes or timing retard but I guess that's a option? I also never thought taller either? Falcon you figure it's better to go to like a 30-31 inch than 10.5 wide? Don't know if anyone makes them in 9" wide? I do run 14 lbs as the Mickey 's seem to hook best there.
I see Mickey makes a 30-9 x15r which is 1/2 inch taller and 1/2 wider would that be better than 29.5 x10.5as far as surface area? I see the 30" are with the better r1 compound? Maybe you on to something Falcon?
I was assuming that going wider would necessitate taller as well. This will increase your mph/rpm. With these three factors: 1. more mph/rpm 2. more traction 3. leave at higher rpm, you'll see a lot of improvement...if it don't break something. Wheelie bars time, your going to have a bumper scraper.
Both cars here run MT 3055 - 28x10.5x15. If you have the room and gear, then a taller 10.5 tire will give more patch but will reduce your gear. As for speed change - well, that depends on the combo, gear, converter, etc. At your ET as posted, you should not be having any traction issues with a 28 or 29" 10.5 tire. If you do, it's the car not the tire. You didn't post a 60', so it's hard to guess.
If you are running a footbrake class, you can forget the delay box because they won't let you run, or you will have to run Top ET (Super Pro). Timing retard is a different deal. I also read an article on taking out timing on the top end for improved power - basically, that was "myth busted".
Well my best times last year was a 1.60 60ft that netted a 11.28 @ 119.41 on open exhaust. This last time out was a 1.66 and netted 11.41@ 119.16 through muffs. The track seemed a little hard to hook. I have been able to hit 1.59 so I would like to see 1.50-1.55 60ft. I would like to crack 10's through muffs so maybe the taller tire would help? I cross line at about 6900-7000? Engine made peak power at 6700. Is the 30x9x15 be enough tire? This tire is the radial slicks which are supposed to net better et & mph. My current slick is a 29.5x9x15 which has at tread width of 8.6. The 30 " listed above has a witdth of 9. My convertor is 4500 and 4.56 gear if I launch on brake it will spin hard. 4400 would hooking the exhaust up bring low end tq up making car spin a little more?
This message has been edited by steve.k from IP address 18.104.22.168 on Aug 1, 2012 11:02 AM This message has been edited by steve.k from IP address 22.214.171.124 on Aug 1, 2012 9:43 AM This message has been edited by steve.k from IP address 126.96.36.199 on Aug 1, 2012 9:41 AM
This is 1.58 60'/7.2x@95 MPH (about 11.20) on a 28" tire. Shift 6800, 4.56 gear, 3200lbs, Stage @ 2200, flash 4800 off foot brake, no spin.
The Mustang here runs a 4200 stall, 4.56 gear, 3100 lbs, 1.65 60', same tire, no spin. The Mustang won't lift a tire doing that. Both cars run Caltraks and the matching Rancho shocks. I get high 1.6x 60's with the little 302 in the car.
If you are spinning on that you might need a 29x10.5. And some suspension work. You might be working a 9" tire a bit too hard, or your suspension may not be putting the power back there evenly/enough. I'd look at the pattern on the tires and get someone to video your launch from the rear to see what is going on back there.
Falcon thanks. I was trying to launch on brake around 3500 but I would still spin. Maybe I should have dropped it abit as I see you stage at 2200. If I went of brake at 4400 spin hard. My car has about 500 more lbs on mostly the front end. Maybe I should drop two step to about 2500 and try it?
I leave at 2200 because the car doesn't move or push when staged. Every combo is different. Mine slows down if I leave at higher RPM. I know of a few cars that leave better at idle than on the converter. So all I can say is - try it and see!
Well the whole Idea I guess would be to launch at your stall speed but this car doesn't like that at its current stage!I think adding tire width and working with susp. will move me closer to stall speed thus upping times.