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Drag radial vs QTP pinion angle #2479355 04/08/18 12:54 PM 04/08/18 12:54 PM
Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan	I know this has been beat to death, but whats the latest on pinion angle needed for Drag radial vs the QTP? I'm buying new tires to replace the QTP's and going back to a drag radial for 99% street driving. My current pinion angle is 2* down. Thanks http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: Drag radial vs QTP pinion angle [Re: mopar dave] #2479360 04/08/18 12:58 PM 04/08/18 12:58 PM
Joined: Jan 2003 Posts: 17,918 Akron, Ohio ProSport I Live Here
ProSport I Live Here Joined: Jan 2003 Posts: 17,918 Akron, Ohio	What rear suspension? 1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual

Re: Drag radial vs QTP pinion angle [Re: ProSport] #2479362 04/08/18 01:01 PM 04/08/18 01:01 PM
Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan	Dana with cal tracs. Gonna change out the front springs for longer to get the tire centered and will be a good time to set correct pinion angle for the Radials. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: Drag radial vs QTP pinion angle [Re: mopar dave] #2479363 04/08/18 01:02 PM 04/08/18 01:02 PM
Joined: Oct 2011 Posts: 3,036 bean town ....Ca W WHITEDART master
WHITEDART master W Joined: Oct 2011 Posts: 3,036 bean town ....Ca	In my opinion you want to try to get the drive shaft as close to straight as possible without going past straight under acceleration.. my old application was about right with 3.. now I run 7.. I bounce between bias and radials all the time.. and never change pinion angle.. maybe you can get a camera down there and watch what's going on and get an accurate set up for your combination In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb

Re: Drag radial vs QTP pinion angle [Re: WHITEDART] #2479370 04/08/18 01:11 PM 04/08/18 01:11 PM
Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan	ok, i may be good where its at then. I have 1* on the shaft and 1* on the pinion. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: Drag radial vs QTP pinion angle [Re: mopar dave] #2479379 04/08/18 01:17 PM 04/08/18 01:17 PM
Joined: Oct 2011 Posts: 3,036 bean town ....Ca W WHITEDART master
WHITEDART master W Joined: Oct 2011 Posts: 3,036 bean town ....Ca	Originally Posted By mopar dave ok, i may be good where its at then. I have 1* on the shaft and 1* on the pinion. I would think that it would be safe place to start.. keep us posted on your e t improvements with the radial Last edited by WHITEDART; 04/08/18 01:17 PM. In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb

Re: Drag radial vs QTP pinion angle [Re: WHITEDART] #2479502 04/08/18 04:39 PM 04/08/18 04:39 PM
Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan	Had radial for years before the QTP. QTP are quicker. Didn't have the correct chassis set up for the radial at the time. The QTP was quicker but the radial was faster. Last edited by mopar dave; 04/08/18 06:10 PM. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: Drag radial vs QTP pinion angle [Re: mopar dave] #2479551 04/08/18 06:27 PM 04/08/18 06:27 PM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	I'd be a bit concerned at 2* myself as that's in the ladder bar/4-link zone w/a lot less wrap up......5 would be a good happy medium imo........ 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: Drag radial vs QTP pinion angle [Re: Thumperdart] #2479562 04/08/18 06:41 PM 04/08/18 06:41 PM
Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan	Ok Dom. I'll make note of that. I wasn't sure how much movement or wrap up there was down there compared to a ladder. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: Drag radial vs QTP pinion angle [Re: mopar dave] #2479566 04/08/18 07:04 PM 04/08/18 07:04 PM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	Calvert recommends measuring the angle of the transmission and the angle of the pinion. The driveshaft angle is not measured in their method. IIRC my tail shaft is down 1.7° and the pinion is yoke down 1.8°, 3.5° total. I think Calvert recommends 2-4°.

Re: Drag radial vs QTP pinion angle [Re: justinp61] #2479572 04/08/18 07:13 PM 04/08/18 07:13 PM
Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan	Its been a few years since i talked to calverts but they recommended 3* pinion angle back then. I will have to remeasure the tailshaft angle which was 2* with the small block if i remember correct. I now have a BB with an engine plate, so remeasuring tail shaft angle i will for sure. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: Drag radial vs QTP pinion angle [Re: Thumperdart] #2479990 04/09/18 02:35 PM 04/09/18 02:35 PM
Joined: Oct 2011 Posts: 3,036 bean town ....Ca W WHITEDART master
WHITEDART master W Joined: Oct 2011 Posts: 3,036 bean town ....Ca	Originally Posted By Thumperdart I'd be a bit concerned at 2* myself as that's in the ladder bar/4-link zone w/a lot less wrap up......5 would be a good happy medium imo........ .. okay I'll bite ...why would two degrees on a car that's 99% Street driven concern you.. I'm just curious. And what would be the consequences of running it like this Last edited by WHITEDART; 04/09/18 02:38 PM. In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb

Re: Drag radial vs QTP pinion angle [Re: mopar dave] #2480056 04/09/18 04:08 PM 04/09/18 04:08 PM
Joined: Mar 2006 Posts: 9,835 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,835 MI, usa	I would assume a drag radial car running Cal Tracks has a fair amount of seperation and housing rotation. Thus more pinion angle required to keep the pinion C/L from rotating past the driveshaft C/L under acceleration. Doug

Re: Drag radial vs QTP pinion angle [Re: WHITEDART] #2480057 04/09/18 04:13 PM 04/09/18 04:13 PM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	Originally Posted By WHITEDART Originally Posted By Thumperdart I'd be a bit concerned at 2* myself as that's in the ladder bar/4-link zone w/a lot less wrap up......5 would be a good happy medium imo........ .. okay I'll bite ...why would two degrees on a car that's 99% Street driven concern you.. I'm just curious. And what would be the consequences of running it like this I ran too little pinion angle years ago and it wrapped up pretty good and felt a horrible vibration on acceleration because like you stated, "You'd like the DS to be near or zero under full load" but I can't even drive right so don't listen to my azz........... 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: Drag radial vs QTP pinion angle [Re: WHITEDART] #2480130 04/09/18 07:05 PM 04/09/18 07:05 PM
Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan	Because it will see the track now and then. So if it wont hook, its a wasted day at the track. 99% street. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: Drag radial vs QTP pinion angle [Re: WHITEDART] #2480381 04/10/18 10:09 AM 04/10/18 10:09 AM
Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan	Looks like no one has found drag radials needing a different pinion angle than a bias tire. Just thought i would check before getting this apart and get the best angle while i'm in there. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: Drag radial vs QTP pinion angle [Re: WHITEDART] #2480391 04/10/18 10:55 AM 04/10/18 10:55 AM
Joined: Oct 2011 Posts: 3,036 bean town ....Ca W WHITEDART master
WHITEDART master W Joined: Oct 2011 Posts: 3,036 bean town ....Ca	Originally Posted By WHITEDART In my opinion you want to try to get the drive shaft as close to straight as possible without going past straight under acceleration.. my old application was about right with 3.. now I run 7.. I bounce between bias and radials all the time.. and never change pinion angle.. maybe you can get a camera down there and watch what's going on and get an accurate set up for your combination I tried but I guess you did not like it..keep fishing tell you catch the answer you like In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb

Re: Drag radial vs QTP pinion angle [Re: WHITEDART] #2480407 04/10/18 11:47 AM 04/10/18 11:47 AM
Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,033 Mt Morris Michigan	I understood the first time. 3* is the target. Where did you take your measures to arrive at 3*? Thank you Last edited by mopar dave; 04/10/18 11:53 AM. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

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