60ft, 330ft help

pfordamx · 07-20-2017, 12:44 PM

i think our car is couple hundreths off in the 60ft and about a 10th off in the 330 and about a 10th off in et for the mph. its all Calvert rear suspension including shocks. the front has limiters and some 3 way adjustable cheesy shocks which need replaced but its not in the budget at the moment. my curiousity is to you guys with leaf spring and caltrac cars do the cars like the front end loose or if it hooks do you try to tie it down. i've always been under the impression that if your hooking wheel stands aren't ideal but it also seems like i've read that alot of cars run better when you let them fly. car is 69 amx 28x10.5 pro bracket radial, 4.10 gear 5500 converter weighs 3264 it could probably use a 4.56 or more gear but that'll be tested later.

Mark Yacavone · 07-20-2017, 12:48 PM

Shallow staging should be worth a few hun.

pfordamx · 07-20-2017, 12:51 PM

thats good advice the car rocks a bit on the trans-brake in the video i couldn't really feel it in the car but its visible, launch rpm is another thing thats only 3200 on the 2 step i've read that that you should leave as low as possible if the car doesn't stumble is there truth to this or should i try more rpm?

casrak7 · 07-20-2017, 01:39 PM

where does it make peak power? where do you shift it at? where does it currently cross at? No reason you cant go solidly low 50's high 40s with that mph. And 1.38-1.42 sixtys.

pfordamx · 07-20-2017, 02:37 PM

It hasn't been dynoed so we are chasing shift points a bit. According to A.H. Adkins some of you may know him runs yellow amx in SS/B he did the head work and is Familiar with the combination he said it should peak at about 7600 and to shift it at 7600, although we ran a 7.00 index class a few weeks back and tried short shifting it alot to slow it down and down to about 6500 and it never dropped off any from lowering the shift point. and that pass it crossed at 6700 if i remember correctly. i'm really seeing and understanding the value in data recorders these days

Billy Nees · 07-20-2017, 03:13 PM

Quote:

Originally Posted by pfordamx

car is 69 amx 28x10.5 pro bracket radial, 4.10 gear 5500 converter weighs 3264 it could probably use a 4.56 or more gear but that'll be tested later.

Methinks that you've already solved your problem. Put the gears in it first.

pfordamx · 07-20-2017, 04:45 PM

I agree with this too but i wanted to see if there where any other hints or things that i was missing.

Mike Rietow · 07-20-2017, 06:41 PM

Converter is too tight at 5500 for a 7600 shift. Needs more gear as well ... 4.88.

pfordamx · 07-20-2017, 07:40 PM

the convert flashes closer to 6000 but yes agreed needs gear i'm not sure if 4.88s would be too much i wish there was 4.60-4.70 ish gear for an 8 3/4

Hacksaw · 07-20-2017, 08:10 PM

Like 4 weeks ago you couldn't get down the track and several posters tried their best to figure out your problem. Now your concerned over .020 in your 60' times? How about you make some laps and figure some of this stuff out yourself ?

07-20-2017, 12:44 PM	#1
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	60ft, 330ft help i think our car is couple hundreths off in the 60ft and about a 10th off in the 330 and about a 10th off in et for the mph. its all Calvert rear suspension including shocks. the front has limiters and some 3 way adjustable cheesy shocks which need replaced but its not in the budget at the moment. my curiousity is to you guys with leaf spring and caltrac cars do the cars like the front end loose or if it hooks do you try to tie it down. i've always been under the impression that if your hooking wheel stands aren't ideal but it also seems like i've read that alot of cars run better when you let them fly. car is 69 amx 28x10.5 pro bracket radial, 4.10 gear 5500 converter weighs 3264 it could probably use a 4.56 or more gear but that'll be tested later. Attached Thumbnails

07-20-2017, 12:48 PM	#2
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,414 Likes: 2,579 Liked 4,447 Times in 1,693 Posts	Re: 60ft, 330ft help Shallow staging should be worth a few hun. __________________ We are lucky we don't get as much Government as we pay for..... Will Rogers

07-20-2017, 12:51 PM	#3
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: 60ft, 330ft help thats good advice the car rocks a bit on the trans-brake in the video i couldn't really feel it in the car but its visible, launch rpm is another thing thats only 3200 on the 2 step i've read that that you should leave as low as possible if the car doesn't stumble is there truth to this or should i try more rpm?

07-20-2017, 01:39 PM	#4
casrak7 Junior Member Join Date: Jul 2011 Posts: 63 Likes: 0 Liked 3 Times in 2 Posts	Re: 60ft, 330ft help where does it make peak power? where do you shift it at? where does it currently cross at? No reason you cant go solidly low 50's high 40s with that mph. And 1.38-1.42 sixtys.

07-20-2017, 02:37 PM	#5
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: 60ft, 330ft help It hasn't been dynoed so we are chasing shift points a bit. According to A.H. Adkins some of you may know him runs yellow amx in SS/B he did the head work and is Familiar with the combination he said it should peak at about 7600 and to shift it at 7600, although we ran a 7.00 index class a few weeks back and tried short shifting it alot to slow it down and down to about 6500 and it never dropped off any from lowering the shift point. and that pass it crossed at 6700 if i remember correctly. i'm really seeing and understanding the value in data recorders these days

07-20-2017, 04:45 PM	#7
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: 60ft, 330ft help I agree with this too but i wanted to see if there where any other hints or things that i was missing.

07-20-2017, 06:41 PM	#8
Mike Rietow Junior Member Join Date: Apr 2017 Posts: 93 Likes: 19 Liked 30 Times in 16 Posts	Re: 60ft, 330ft help Converter is too tight at 5500 for a 7600 shift. Needs more gear as well ... 4.88.

07-20-2017, 07:40 PM	#9
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: 60ft, 330ft help the convert flashes closer to 6000 but yes agreed needs gear i'm not sure if 4.88s would be too much i wish there was 4.60-4.70 ish gear for an 8 3/4

07-20-2017, 08:10 PM	#10
Hacksaw Senior Member Join Date: Sep 2016 Posts: 838 Likes: 148 Liked 276 Times in 151 Posts	Re: 60ft, 330ft help Like 4 weeks ago you couldn't get down the track and several posters tried their best to figure out your problem. Now your concerned over .020 in your 60' times? How about you make some laps and figure some of this stuff out yourself ?

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