[paul massicotte]

I just put in a new clutch after running a stock AC Delco for three years. With the Delco the car would 60' 1.71 to 1.74 launching @ 3000 all day long. I usually ran 12.0's to 12.teens.

I really felt the clutch was giving up alot and not transferring power to the wheels so I changed it out in favor of a Hays 34-618 PP with 2750 lbs of static pressure. I had a disc made for the car from Portland Transmissions in RI which is a sprung hub race compound.

The first time out with the 28x11.50 ET Streets @ 16 lbs., launching the same way the car blew the tires off through the 60 ft. So I aired them down to 14 and launched which resulted in a 1.95 60'

I tried 13, 14, 17, and 18 lbs. I still 60'd 1.91 to 1.95. I tried launching softer and I still only saw 1.90's. I tried launching harder @ 3500 and still was 1.90+.

Each time the ET was up to 12.40+


Any thoughts?

 

[JIM]

Since you said it blew the tires off, there goes your 60' times.
Perhaps the old AC Delco clutch slipped a bit and the new Hays is more aggressive and hits the tires too hard?

 

[paul massicotte]

Since you said it blew the tires off, there goes your 60' times.
Perhaps the old AC Delco clutch slipped a bit and the new Hays is more aggressive and hits the tires too hard?

That was the first time on a street night where the track wasn't prepped. It was a 2.1 then.

At Englishtown last weekend, with a prepped track it was in the 1.90's. I should have put that in there. Sorry.

 

[paul massicotte]

Ttt

 

[gusszgs]

Paul, was your mph better with the new clutch?

 

[paul massicotte]

It was the same 114 -116 with the new clutch.

 

[Nicks406]

is the 28" et street a new part of the equation too?

 

[aukai]

ET streets would not hook for me down to 2500 rpm and at any air pressure

 

[paul massicotte]

is the 28" et street a new part of the equation too?

In June, I ran the these tires (new) and ran 1.74 short times. I switched clutches and ran the 1.90's

Everything else was the same between June and September.

 

[paul massicotte]

Just wanted to let everyone know, and anyone searching in the future, I sorted this out.

I was using the Metco lowers with the relocation brackets to set the lower arms up like the old Southsides. They didn't work!


I removed them put the lowers to the stock location, and readjusted the pinion angle to -2, which made the car launch like it used to.

1.73 short times down from 1.95's!!!!


The car ran 11.87 @ 117. Better but I know it's got more in it.

 

[Dave427]

11.87, thats rocking. So the re-location brackets made it not launch wow.

Dave

 

[paul massicotte]

11.87, thats rocking. So the re-location brackets made it not launch wow.

Dave

Once I changed the IC back, it picked up. I have a lot more research to do on suspension to get the car's ET to catch the MPH. Right now it looks like a basketball going down the track.

An HnR Parts bar is going in over the winter.