Cant get car to 60'

[1nicenova]

Just took car to track with new slicks. Now have mt 29.5 x 10.5w's from 315/60 radials. now difference in 60' other than more consistent. Seems no matter what changes i make cant get any better 60' than a 1.40. made 8 passes yesterday and 60's were between 1.40 and 1.43. changed caltracs from no preload in lower hole to quarter turn, changed shock setting from 2 clicks to 5. changed launch rpm. tire pressure left at 11.5 cold which is 13 by time i get back to pit and check. Had same 60's when i had drag radials on it. best is a 1.38. all 8 runs were between 9.96 and 10.00 @ 135 except for last one that i hit it with a 150 shot off line and also went 1.41 60' and 9.50et @ 143.5 Can see it spin on that pass on video. Has 3.73 gears which could be holding it back some. Is driven on street alot hence wrong gear. I'm sure it would be quicker with 4.11's. only crosses line at 6300 with the 3.73's.
Is problem in front end? Has moroso drag springs and 90/10 shocks, 6" travel up front and loose poly bushings. Rear has full caltrac setup with qa1 singles. Trans is a 400 with brake and 9" trans specialties converter that will stall 4800 on brake. Thanks.

[cad]

Those 60's and ETs sounds like one heck of a bracket car to me.
Some spin is not bad as long as it does it consistently.

Do you have video of the runs with the tire spin?
We cant see it unless we video and play back in slow motion.

Clark

[1nicenova]

Yes have vids of each pass. Will try to post them up tonight. Didn't seem to really spin a bunch except on nos pass.
Starting to wonder if its best its going to get with that gear, and possibly needing a better converter. Think my intake
Could be holding it back some too. Is one of those "proproducts" victor copies. I know chinese junk. But I had it so I used
It when building this motor. Would like to switch to a cnc 454r or trickflow.

[John_Heard]

That car ought to be doing at least mid 1.30's or better with the equipment it's already got.

Question is... is it spinning or just down on power? As already mentioned, some vids would help.

[DOTracer]

The torque converter can make or break the cars performance. Being you said yours is street driven, your likely gonna have to compromise on the converter which is gonna hurt the short times on the track.

What size/brand converter does it have and what does it truly flash to?

[supernova]

Yes have vids of each pass. Will try to post them up tonight. Didn't seem to really spin a bunch except on nos pass.
Starting to wonder if its best its going to get with that gear, and possibly needing a better converter. Think my intake
Could be holding it back some too. Is one of those "proproducts" victor copies. I know chinese junk. But I had it so I used
It when building this motor. Would like to switch to a cnc 454r or trickflow.

I have a 454r tall deck intake and love it. I used a Team G intake before the 454.

Consistent thats for sure...... Your set up with the big DR's might have been better that you thought. But if you haven't changed enough explains the no change in your runs. Your DR's are big and bite like slicks. Keep that in mind.

[427belair]

You have the right stuff to be in the mid to low 1.3 range with your 60's, but I would bet your gearing is holding you back. I would try a 4.11 gear or maybe a 28" tire. The 454r manifold is a killer peice btw, especialy if some one takes a grinder to it.

[1nicenova]

You have the right stuff to be in the mid to low 1.3 range with your 60's, but I would bet your gearing is holding you back. I would try a 4.11 gear or maybe a 28" tire. The 454r manifold is a killer peice btw, especialy if some one takes a grinder to it.

Thats what i figured. I had 4.11's in it before this engine with a 582 but only ran it a few times. I suspect the gearing is a big part of it and that i was hitting a wall for going any quicker. And that it would take more power to 60' any better, hence thinking the intake is wrong. Just not sure if i want to go back to the 4.11's. the 3.73's are nice when cruising on the street. I only race a few races a year with it. And 2 times are in the 10.0 index which it runs right on with these gears. Its just the gearhead in me that wants to get every last bit out of this combo. Ive looked at similar combos and think its capable of running 9.60's-9.70's on motor.
Having trouble finding correct driver to download videos of last runs, dam vista. but should have it figured out tonight.

[Elkyman1]

Heck, your right in the ball bark with your 60's vs the gearing, conv. and tire I think, but what kind of power is the engine making? How heavy is the car? You should be lighter than me for sure.
Quick example, My Elky, 3615lbs, 116" w/b, 505 bbc with a glide, 5000 stall 9" JW convt. and 1.80 gears and a T-brake, 12 bolt with 4.88 gears on a 30 tall 10.5 tire only being able to launch at 3600 most of the time, and I 1.40-1.45 many weekends and the Elky was consistant, but I was beating the tires up as they were soft sidewalled, and I needed stiff sidewalled slicks. You can run more air psi, and are more stable at higher speeds. I too used to run 9.90's and even down to 9.80's down south in Memphis at 137+mph.

Now with my 14 x 32's and a new 4 link, it's a whole new ball game again. I would guess, that my lil old 505 maybe makes around 720-750hp, MAYBE, but it makes over 800 I think at the flexplate.

What's your pinion angle vs the drive shaft angle vs the trans yoke? everything good in these area's? Do you have rim screws? Just tryng to elim. any problems...

The larger numerical gears will help off the line for sure, but like you said, you cruise it more than race it. Option, build another axle to swap out, or just decide what you want more! Tuff call

John