Best pressure for BFG Drag Radials at track??

Grandmaster

New Member

Dec 7, 2002

374

0

0

Monticello, Arkansas

May 27, 2004

#21

• May 27, 2004

• #21

FTI is a flow tech induction custom cam curtosy of ed curtis.
-GM

 

86Cobra

Founding Member

Jun 6, 2000

2,064

1

0

Phoenix, AZ

May 27, 2004

#22

• May 27, 2004

• #22

Why not just replace your valve springs? Solve the problem instead of working around it.

 

Stang8URMPRT

Active Member

Dec 28, 2003

1,100

1

38

Daytona Beach, FL

May 27, 2004

#23

• May 27, 2004

• #23

I just replaced them about a month ago. It's a flat tappet, and doesn't like RPM. And they are the springs called for my cam.

Nick

 

maverick0716

Founding Member

Jan 12, 2002

3,924

0

56

Chilliwack, BC, Canada

May 27, 2004

#24

• May 27, 2004

• #24

You're hitting valve float at 5300 rpm? hmmm.....thats pretty low.

 

Stang8URMPRT

Active Member

Dec 28, 2003

1,100

1

38

Daytona Beach, FL

May 27, 2004

#25

• May 27, 2004

• #25

I'm hitting it at about 5900-6000 RPM... Dunno.. I was told I might need to check valve spring pressure and maybe shim them.

Nick

 

maverick0716

Founding Member

Jan 12, 2002

3,924

0

56

Chilliwack, BC, Canada

May 27, 2004

#26

• May 27, 2004

• #26

Stang8URMPRT said:

I'm hitting it at about 5900-6000 RPM... Dunno.. I was told I might need to check valve spring pressure and maybe shim them.

Nick

Click to expand...

110 mph with 3.73 gears with a T-5 in 4th gear with a 26" tire (stock) is 5300 rpm.......I'm assuming the 4th gear on the 3550 is also 1.00:1 ratio. Are you sure you have 3.73's because by your rpms it sounds like you are in between 4.10 and 4.30

 

Stang8URMPRT

Active Member

Dec 28, 2003

1,100

1

38

Daytona Beach, FL

May 28, 2004

#27

• May 28, 2004

• #27

It's actually a 25 inch tire. I know it's right about 5800-6000 RPMs. I KNOW it's not 5300 RPMs.

 

maverick0716

Founding Member

Jan 12, 2002

3,924

0

56

Chilliwack, BC, Canada

May 28, 2004

#28

• May 28, 2004

• #28

Stang8URMPRT said:

It's actually a 25 inch tire. I know it's right about 5800-6000 RPMs. I KNOW it's not 5300 RPMs.

Click to expand...

Oh, I thought you were running stock diameter tires.

 

1

1bad92lx

New Member

Mar 31, 2003

247

0

0

Close to lynchburg, VA

May 29, 2004

#29

• May 29, 2004

• #29

Well guys, I couldn't get my bfg's to hook at all tonight. My 60ft was a 2.15, time was a 8.4@85.55 mph on motor. I went as low as 16lbs of pressure and they still wouldn't hook. In the burnout area the car felt strong, but on the line it spun real bad. I was getting teased by everyone there. I'm running 275/50/15's on a 8.5" rim. I did a pretty good burnout I thought, but I guess it wasn't enough. I tried to spray the car on the first run and the bottle went dry on me and I spun violently in first and second and went a 8.5@89.7 mph. Should I be heating the tires a lot? I know on a real slick that you should get them nice and hot, but I don't know the best way to get a drag radial to hook. I've got the car set up for the track with the complete drag launch kit from eibach on it and the car hooks awesome on the street, but not worth a poop at the track. Anybody got any suggestions???

 

Norkex

New Member

May 26, 2004

6

0

0

Stockton, CA

May 29, 2004

#30

• May 29, 2004

• #30

http://support.pro3i.com/faq.php?article=7

The article has info about burnouts for DR's and launching RPM's...

Good luck.

 

86Cobra

Founding Member

Jun 6, 2000

2,064

1

0

Phoenix, AZ

May 29, 2004

#31

• May 29, 2004

• #31

1bad92lx said:

I went as low as 16lbs of pressure and they still wouldn't hook.

Click to expand...

86Cobra said:

I run 10-11 psi cold, which ends up being around 12 psi hot. Yes, they'll hook. I launch at about 5200 rpm and get high 1.5s and low 1.6s on 275/50-15s.

Click to expand...

Do a long burnout. They need to be hot. Once you get the pressure and burnout right, it's just a matter of practice.

 

1

1bad92lx

New Member

Mar 31, 2003

247

0

0

Close to lynchburg, VA

May 29, 2004

#32

• May 29, 2004

• #32

Does anyone have a clue what my car should run if I get the spinning under control?? I'm thinking somewhere around an 8.0, but I'm not sure. I ran a 8.4 with a 2.15 60ft and went 85.55mph. I spun all the way through 1st and the beginning of 2nd. That was on motor. I figure why try spraying it if I can't even hook on motor. Hey 86Cobra, what kind of 1/8 mile times are you getting? I see your running 11.80's through the 1/4. Sounds like you've got a strong running street car.

later,

Matt

 

86Cobra

Founding Member

Jun 6, 2000

2,064

1

0

Phoenix, AZ

May 29, 2004

#33

• May 29, 2004

• #33

I run consistent 7.6-7.7s with a best in the 7.5s.

I would think you could run at least an 8.0 if you get it to hook.