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Author
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Topic: I got to the strip at long last!!
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Steve-UK
Gearhead Posts: 215
From: Wickford, Essex, England
Registered: Jan 2003
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posted 09-26-2004 07:08 PM
   
Well at long last I got to drive the car down the strip, had to wait till 3.45 pm when the rain stopped, and they got the track dried out  Well it is the first time I have run a car on the strip and got a time of 15.759 ET with a speed of 88.55 over the 1/4(Well that was the best one)
Well I now have a few questions, I am crossing the line in third gear (Toploader) around 4800 - 5000rpm does this seem about right, I am not sure what ratio I have in the back. At the moment it is not pulling to clean above 4700, I think that is down to still having points, which I will be changing next month (MDS system)Any thoughts would be great. [This message has been edited by Steve-UK (edited 09-26-2004).]
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ukracer
Gearhead Posts: 151
From: South Wales UK
Registered: Apr 2003
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posted 09-27-2004 04:15 AM
Hi Steve, congrats on finally getting a slip on your car. I used to drag race my Mustang years ago, which strip did you run at?
Your gearing is probably wrong for drags but my old 351W used to cross the lights in 3rd, posting 13.50's at about 107 with 3.25 gears, mostly stock. Points ignition in that car as well as the others I built, including a 460 that ran 11.0's (not quite in the tens)while still a street car. Problem with changing gearing for drags is it makes the car a pig for road use (esp. with our fuel prices). There are better ways. My '70 has a mild 460 and 2.75 gears in the 9". Stock converter in C6. Car is set up for circuit racing but has run mid 12's at Avon Park at 114 mph. Much more fun than using low gears (been there, done that). I circuit race my Mustang now anyway so drags have lost their interest for me.
Cheers, Martin.
PS, are in in MOC?[This message has been edited by ukracer (edited 09-27-2004).]
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mustangboy
Gearhead Posts: 774
From: Ont, Canada
Registered: Mar 2002
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posted 09-27-2004 12:50 PM
Don't know any details on your car so its difficult to comment on your times.I just wanted to say that the points will rev cleanly to 6000 if they are in good shape and adjusted properly.I ran the stock points for many years with no problems shifting at 6000.------------------
1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker http://mustangsandmore.50megs.com/MembersPics/mustangboy.html
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Steve-UK
Gearhead Posts: 215
From: Wickford, Essex, England
Registered: Jan 2003
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posted 09-27-2004 01:13 PM
Hi Guys, Well at the moment the engine is pretty stock 302, the only thing that I know is it fitted is a FMS-M-6250-A312 camshaft, with the following spec:-
Duration: 290 intake/300 exhaust
Gross valve lift: .472" intake/ .496" exhaust
Lobe separation: 107 degrees intake/117 degress exhaust.It is fitted with a Holley 4160 with an Edelbrock Performer RPM manifold It has tri-y headers, with a flowmaster system fitted with terimator mufflers. I will have to pull the diff to find out what ratio I am running. Mustangboy what coil were you running when you had points. Martin sounds like your car could shift, yup I am a member of the MOC.
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 09-27-2004 02:00 PM
Steve, This should help you come close to the gear ratio you have. You'll need to know a MPH and RPM in 4th gear and rear tire size.http://www.randysringandpinion.net/calculators/calculatorsind.html I'd say those are good times for your setup. ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics [This message has been edited by Fastymz (edited 09-27-2004).]
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mustangboy
Gearhead Posts: 774
From: Ont, Canada
Registered: Mar 2002
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posted 09-27-2004 09:35 PM
If you look in my pics section, the one of the engine you can see the big ol fat yellow Accel coil.I've ran it for years and I still have the same setup with a pertronix unit installed now.I think you can probably do a little better times with your current mods but if its not revving out cleanly that would explain alot.Also I have no clue what elevation your at or how heavy your car is.I would guess you've probably got 2.75 or 3.00:1 gears if your still in 3rd at 88mph.------------------
1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker http://mustangsandmore.50megs.com/MembersPics/mustangboy.html [This message has been edited by mustangboy (edited 09-27-2004).]
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TomP
Gearhead Posts: 5761
From: Delta BC Canada
Registered: Dec 99
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posted 09-28-2004 02:50 PM
Steve It should be a bunch faster, even with the gearing issue. It sounds like timing or ignition problems. The MSD may cure it but it should be a matter of a tune up to get it to run to 6000rpm.
Could be weak valvesprings floating at 4700 though not as likely since i run 200,000 mile dead original 5.0L springs in my Ranger with a B303 cam and it hits 6000 often. It could be the springs are inadequate for the lift, check to make sure they aren't binding at full lift. Gearing the car to drive on the highways and race is a compromise. The 70 mph drive is nicer with 3.00's but for drags 4.11's would be the way to go. For what it's worth gas mileage never dropped off when i went from 3.25's to 3.70's in a 390 Ranchero, it was a 200 mile drive at 80+ mph to the track too.
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Steve-UK
Gearhead Posts: 215
From: Wickford, Essex, England
Registered: Jan 2003
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posted 09-28-2004 05:12 PM
Hi Guys
I went to Randy's site and have played with some numbers I think I have a 3.70 ratio in the rear, but I will pull the diff later this year just to check (I am assuming that top in a toploader is 1:1 ratio) Thanks Scoop.Mustangboy I had a look at you pics, and saw the coil you are running, it looks a monster! TomP I think my ignition system is ready for an update, as the leads look tired, and the rest look a little rough. I have a MSD ignition set-up to fit, when I get time. I am not sure abot the valve springs I will have to check that. I am hoping to get to the strip maybe late Oct to get another run with the new bits fitted
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Bloose
Gearhead Posts: 621
From: Milwaukee, WI
Registered: Dec 2001
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posted 09-28-2004 06:17 PM
To figure the gear in the car just jack up the rear end till the tires are off the ground. Then rotate a tire one full revolution (trans in N) and count the number of times the driveshaft turns. If you are not running a posi you will have to lift just one tire and leave the other on the ground. It is ery simple and will get you very close. If you rotate the tire one full turn and the drive shaft rotates 3 full turns and then just less than a 4th you have the 3,70's you mentioned. It really is easy and you will be able to tell the gear right away.As for the non clean running above 4700. My 289 was doing that last year. I had just changed from Duraspark to an MSD6 so I thought it was noise or something. When I went to the 6 I also put in new valve springs. The springs I put in should have been better than the ones I had in there. Last winter I changed the heads and went to AFR's. The AFR's came with really nice springs and I added Ti retainers. The motor now revs clean all the way to 8000rpm. With the old heads and the new springs I couldn't get over 5K. HTH,
B-loose
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Steve-UK
Gearhead Posts: 215
From: Wickford, Essex, England
Registered: Jan 2003
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posted 09-30-2004 09:08 AM
Hi B-LooseI am not sure what vavle springs are fitted, but if things go to plan when I am over in the State's in Nov. I am hoping to get some heads, I have been thinking about the AFR units, what do you think of them and which ones did you get?
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