bog

Bill Bogues · 05-21-2010, 11:37 PM

I'm having a problem leaving the starting line that I can't seem to solve. My car is a Nova 350/270 that runs in H/SA. When I leave the line it flashes the converter to stall speed (usually around 4800 to 5000) but then instead of pulling on up to 2nd gear shift point it falls back to 4500 for a second and then pulls on up. This just kills the 60 ft times. I've tried two different carbs (Q-Jets) and they both do the same thing. Checked fuel delivery, tried different air cleaner bases and tried adjusting fuel pressure. Could it possibly be something in the torque converter. If I had stator trouble would it try to pull the motor down like that on launch. Thanks for any advice. .

FED 387 · 05-22-2010, 09:03 AM

try another convertor stator probably damaged during burnouts--Comp 387

Alan Roehrich · 05-22-2010, 09:13 AM

Leaving off a two step, or from a high idle and flashing?

Bill Bogues · 05-22-2010, 11:14 AM

Alan: I'm leaving off the two step at 2900. I didn't mention this in the other message but on one pass when I put the Hedworth carb on, it didn't fall back. thought I had found the problem but the next pass with same carb it did it again. Thanks for any replies Bill

Ultimate Converter Concepts · 05-22-2010, 11:16 AM

Could be a few different things including carb(very importanty) or a sprag problem or stator selection thing. If the converter is too tight it will pull the engine below it's peak torque and it will labor untill it gets back to peak and then take off, it will also be noticeable on the gear change, pulling the motor down below peak tq. Is this a "glide or a three speed set up? How high do you turn the engine? Do you have any dyno number's on the engine? Looking for peak tq. and how much.

Alan Roehrich · 05-22-2010, 11:42 AM

Bill, has it always done this, or is this a new problem?

You might try changing your two step RPM up or down in 200 RPM increments.

The problem you describe doesn't really sound like a loose stator shaft.

It sounds like the converter MAY be about 200 RPM or so too tight.

You might also try tightening the secondary air door an 1/8 turn.

There is a small baffle that attaches to the top of a QJet, on the two screws behind the choke horn. If you do not have one, you might want to get one and try it.

You might try a little more timing on the starting line.

Ultimate Converter Concepts · 05-22-2010, 11:51 AM

Quote:

Originally Posted by alan roehrich

bill, has it always done this, or is this a new problem?

You might try changing your two step rpm up or down in 200 rpm increments.

The problem you describe doesn't really sound like a loose stator shaft.

It sounds like the converter may be about 200 rpm or so too tight.

You might also try tightening the secondary air door an 1/8 turn.

There is a small baffle that attaches to the top of a qjet, on the two screws behind the choke horn. If you do not have one, you might want to get one and try it.

You might try a little more timing on the starting line.

x2

Rich Biebel · 05-22-2010, 08:38 PM

A Q-jet problem....I'd bet on it.....

I sorted thru 3 carbs and had one that worked perfect......The other two gave me problems off the line no matter what I tried.....and I tried a lot of adjustments....

A Hedworth carb did not work for me unless the engine was cold.... once it was warm it did exactly as you described.....I bought one and hoped it would cure my issues and it did not......Driving the car off the footbrake was very difficult with the way the secondaries tipped in....

I got one from another racer that worked very well and was easy to stage and race with.......

Woodro Josey · 05-24-2010, 10:29 AM

Bill, i would bet it is a Quadrajet problem. Getting them to work perfect with a 2 step can be a pain in the but sometimes.

Chad Mahlosky · 05-24-2010, 08:29 PM

Ironically, I run the same combination, in a GSA Nova. I bought a new fuel pump, and relocated it. I also went with new fuel cell, upgraded from hard 3/8 aluminum line to 1/2 in braided, changed fuel pressures, carbs, all the same stuff you mention. My car did it off of footbrake, and worse when I two-stepped the car. Still to this day, the car doesn't always act right, especially in good, cool air. No matter the combination that I try, my car will only run if its really, really lean. I mean like shouldn't even run its so lean. But, if you fatten up the carb at all, it absolutely falls on its face. I eventually got the problem somewhat cured, by putting the rods back into the front of the carb. This definitely got my car to leave on the two step. But please, someone tell me what to do, or why my car can not be fattened up and run?

05-21-2010, 11:37 PM	#1
Bill Bogues Member Join Date: Apr 2005 Location: Bethany La. Posts: 322 Likes: 95 Liked 169 Times in 53 Posts	bog I'm having a problem leaving the starting line that I can't seem to solve. My car is a Nova 350/270 that runs in H/SA. When I leave the line it flashes the converter to stall speed (usually around 4800 to 5000) but then instead of pulling on up to 2nd gear shift point it falls back to 4500 for a second and then pulls on up. This just kills the 60 ft times. I've tried two different carbs (Q-Jets) and they both do the same thing. Checked fuel delivery, tried different air cleaner bases and tried adjusting fuel pressure. Could it possibly be something in the torque converter. If I had stator trouble would it try to pull the motor down like that on launch. Thanks for any advice. .

05-22-2010, 09:03 AM	#2
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,400 Likes: 482 Liked 320 Times in 172 Posts	Re: bog try another convertor stator probably damaged during burnouts--Comp 387

05-22-2010, 09:13 AM	#3
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,066 Likes: 1,487 Liked 1,630 Times in 378 Posts	Re: bog Leaving off a two step, or from a high idle and flashing? __________________ Alan Roehrich 212A G/S

05-22-2010, 11:14 AM	#4
Bill Bogues Member Join Date: Apr 2005 Location: Bethany La. Posts: 322 Likes: 95 Liked 169 Times in 53 Posts	Re: bog Alan: I'm leaving off the two step at 2900. I didn't mention this in the other message but on one pass when I put the Hedworth carb on, it didn't fall back. thought I had found the problem but the next pass with same carb it did it again. Thanks for any replies Bill

05-22-2010, 11:16 AM	#5
Ultimate Converter Concepts Sponsor Join Date: Nov 2007 Location: Cornelius, N.C. Posts: 403 Likes: 6 Liked 59 Times in 12 Posts	Re: bog Could be a few different things including carb(very importanty) or a sprag problem or stator selection thing. If the converter is too tight it will pull the engine below it's peak torque and it will labor untill it gets back to peak and then take off, it will also be noticeable on the gear change, pulling the motor down below peak tq. Is this a "glide or a three speed set up? How high do you turn the engine? Do you have any dyno number's on the engine? Looking for peak tq. and how much. __________________ Lenny Croteau www.ultimateconverter.com Phone 704-892-6837

05-22-2010, 11:42 AM	#6
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,066 Likes: 1,487 Liked 1,630 Times in 378 Posts	Re: bog Bill, has it always done this, or is this a new problem? You might try changing your two step RPM up or down in 200 RPM increments. The problem you describe doesn't really sound like a loose stator shaft. It sounds like the converter MAY be about 200 RPM or so too tight. You might also try tightening the secondary air door an 1/8 turn. There is a small baffle that attaches to the top of a QJet, on the two screws behind the choke horn. If you do not have one, you might want to get one and try it. You might try a little more timing on the starting line. __________________ Alan Roehrich 212A G/S

05-22-2010, 08:38 PM	#8
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,312 Likes: 25 Liked 543 Times in 212 Posts	Re: bog A Q-jet problem....I'd bet on it..... I sorted thru 3 carbs and had one that worked perfect......The other two gave me problems off the line no matter what I tried.....and I tried a lot of adjustments.... A Hedworth carb did not work for me unless the engine was cold.... once it was warm it did exactly as you described.....I bought one and hoped it would cure my issues and it did not......Driving the car off the footbrake was very difficult with the way the secondaries tipped in.... I got one from another racer that worked very well and was easy to stage and race with....... __________________ Rich Biebel S/C 1479 Stock 147R

05-24-2010, 10:29 AM	#9
Woodro Josey Senior Member Join Date: Jul 2007 Posts: 805 Likes: 0 Liked 3 Times in 1 Post	Re: bog Bill, i would bet it is a Quadrajet problem. Getting them to work perfect with a 2 step can be a pain in the but sometimes. __________________ Woodro Josey 2002 STK

05-24-2010, 08:29 PM	#10
Chad Mahlosky Junior Member Join Date: Jun 2006 Posts: 83 Likes: 0 Liked 7 Times in 2 Posts	Re: bog Ironically, I run the same combination, in a GSA Nova. I bought a new fuel pump, and relocated it. I also went with new fuel cell, upgraded from hard 3/8 aluminum line to 1/2 in braided, changed fuel pressures, carbs, all the same stuff you mention. My car did it off of footbrake, and worse when I two-stepped the car. Still to this day, the car doesn't always act right, especially in good, cool air. No matter the combination that I try, my car will only run if its really, really lean. I mean like shouldn't even run its so lean. But, if you fatten up the carb at all, it absolutely falls on its face. I eventually got the problem somewhat cured, by putting the rods back into the front of the carb. This definitely got my car to leave on the two step. But please, someone tell me what to do, or why my car can not be fattened up and run? __________________ Chad Mahlosky 3225 STK