First Passes on Nova with MJ467 - Page 3 - Chevelle Tech
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post #31 of 40 (permalink) Old Apr 10th, 19, 11:26 PM
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Chris
 
Join Date: Feb 2006
Location: Lincoln pk NJ
Posts: 3,458
Re: First Passes on Nova with MJ467

Quote:
Originally Posted by jackie schmidt View Post
Wow. Great build.

I would like to know the weight. Any guesses.
I'm going to say 3500 with a big block.
Mine is 3300 and change with a SB, alum heads,rad,water pump, all steel,glass,interior and full exhaust to behind the tires.

73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


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post #32 of 40 (permalink) Old Apr 11th, 19, 12:26 AM
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Todd
 
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Location: San Martin,CA
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Re: First Passes on Nova with MJ467

Quote:
Originally Posted by jackie schmidt View Post
Wow. Great build.

I would like to know the weight. Any guesses.
Quote:
Originally Posted by WHT/73 View Post
I'm going to say 3500 with a big block.
Mine is 3300 and change with a SB, alum heads,rad,water pump, all steel,glass,interior and full exhaust to behind the tires.

I essentially have the same car as the OP. Mine does have a full chromoly cage and a Dana 60 instead of a 9". My car weighs 3515 with me in it.

1970 Chevelle SS 396 (491 now) 4spd
1969 Nova 496 Turbo 400 Dana 60
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post #33 of 40 (permalink) Old Apr 12th, 19, 1:08 AM Thread Starter
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Renzo
 
Join Date: Jul 2003
Location: Inland Empire, CA
Posts: 53
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Re: First Passes on Nova with MJ467

Planning on getting the car scaled, hopefully soon.

I didn't think the exhaust would be a bottleneck but definitely would like to confirmed if it is. Maybe it will be worth running open headers next time out.

While checking timing we noticed the throttle bracket had some noticeable flex, checked throttle and we were not getting full throttle (this was before the runs), made some adjustments to the throttle cable and was able to get more throttle but still not all the way. Lots of flexing from the bracket, pedal and even the firewall. Can a 7/8s throttle opening have an effect?

Pictures below show the difference between what i'm getting with the pedal to the floor and full throttle.
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'70 Nova, MJ467, TH400, 9"
Best 1/4: 10.692 @ 126.03
Best 1/8: 6.798 @ 101.19
Best 60ft: 1.476
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post #34 of 40 (permalink) Old Apr 12th, 19, 10:15 AM
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Kerry
 
Join Date: Feb 2013
Location: Lloydminster, Alberta
Posts: 921
What is your pedal/bracket/cable set up?

I use a stock pedal in my Nova with a lokar bracket and cable. I had to change the way the bracket was supported and how I was bolting it on in order to have it stay in place and give consistent throttle opening.

Replaced the small Allen head screw which pushes against the carb baseplate with a normal larger head stainless steel one, and lock it in place with 2 nuts. The large head of the screw pushes against the baseplate. And when installing the bracket it is pulled out as far as it can go to the drivers side so the carb stud is at the end of the slot in the bracket.
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post #35 of 40 (permalink) Old Apr 12th, 19, 10:58 AM
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Chris
 
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Location: Lincoln pk NJ
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Quote:
Originally Posted by 496blaze View Post
Quote:
Originally Posted by jackie schmidt View Post
Wow. Great build.

I would like to know the weight. Any guesses.
Quote:
Originally Posted by WHT/73 View Post
I'm going to say 3500 with a big block.
Mine is 3300 and change with a SB, alum heads,rad,water pump, all steel,glass,interior and full exhaust to behind the tires.

I essentially have the same car as the OP. Mine does have a full chromoly cage and a Dana 60 instead of a 9". My car weighs 3515 with me in it.
Wow that’s light with a big block and a cage.

So 3” exhaust and ultra flo straight through mufflers are restrictive?
I guess I should have dropped my exhaust when I went.
Mine was 3” reduced at the X pipe to 2.5” mufflers and tails....
I wanted to run my car the way it runs the streets and run 10’s like the OP.
Goal met for both of us on 1st trip to the track.

73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


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post #36 of 40 (permalink) Old Apr 12th, 19, 1:59 PM
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Brian
 
Join Date: Aug 2009
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Posts: 770
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Re: First Passes on Nova with MJ467

Quote:
Originally Posted by chevyguy8 View Post
Planning on getting the car scaled, hopefully soon.

I didn't think the exhaust would be a bottleneck but definitely would like to confirmed if it is. Maybe it will be worth running open headers next time out.

While checking timing we noticed the throttle bracket had some noticeable flex, checked throttle and we were not getting full throttle (this was before the runs), made some adjustments to the throttle cable and was able to get more throttle but still not all the way. Lots of flexing from the bracket, pedal and even the firewall. Can a 7/8s throttle opening have an effect?

Pictures below show the difference between what i'm getting with the pedal to the floor and full throttle.

The throttle opening wont have as much effect as one might think, I changed carpet in my car a few years ago and went to the track shortly after car ran great but felt a little soft 11.0`s @123 got home started checking for the issue found my throttle was only opening about 1/2 way hardly any secondary opening at all. I fixed the issue went back to the track in similar conditions ran 10.80`s @124-5 that was with half throttle...

Brian

66 chevelle
New Combo
555
10.2 comp
Straub ProMaxx heads
Straub solid roller
TH400/373
3815lbs
1.31 60'
[email protected]
[email protected]


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post #37 of 40 (permalink) Old Apr 13th, 19, 1:12 AM Thread Starter
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Renzo
 
Join Date: Jul 2003
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Posts: 53
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Re: First Passes on Nova with MJ467

I have the lokar pedal and cable assy, the carb bracket is a Summitt aluminum piece. I did have to make a sharp turn off the firewall and cyl head with the cable. so im going to revisit that. Might end up fabricating my own bracket and then fix/strengthen the firewall (I think it might cracked).

Trying to sort every little detail out and knowing that i dont have full throttle bugs the crap out of me.
427L88 and WHT/73 like this.

'70 Nova, MJ467, TH400, 9"
Best 1/4: 10.692 @ 126.03
Best 1/8: 6.798 @ 101.19
Best 60ft: 1.476
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post #38 of 40 (permalink) Old Apr 30th, 19, 2:23 AM
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Bob
 
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Location: Lake St Louis, Mo
Posts: 588
Re: First Passes on Nova with MJ467

Something I didn't see in the build link was any mention of the intake being worked over. I have talked to some people that feel the Roval shape of the AFR265s,290s,300s are best when an intake has been worked to take advantage. Did the air gap get worked over?

Bob
1972 Nova
496 AFR315
Straub Custom HR 258/260 108 lsa
MT 255x60x15 drag radials, 1050 CFM 4150 QF/Demon
1/4 10.067 **NEW** 10/24/2018
1/4 133.62 MPH **NEW** 10/24/2018
60' 1.446 **NEW** 10/24/2018
Best 1/8 - 6.404 **NEW** 10/24/2018
Best 1/8 mph 107.75 **NEW** 10/24/2018
Dragweek 2015,2017,2018 SME
2016,2017 RMRW 11.0 index
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post #39 of 40 (permalink) Old Apr 30th, 19, 11:48 AM
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Alan
 
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Location: League City, TX
Posts: 1,882
Re: First Passes on Nova with MJ467

Nice passes for the first trip out in crap DA.... Definitely 10.50s in good winter air....

I'm not surprised a bit from an MJ motor tho....

1971 Corvette
VortecPro 496"
T400, Tight 10" converter
3.36 gears, 3700lb raceweight
[email protected], 1.51 60'
STOCK APPEARING
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post #40 of 40 (permalink) Old May 2nd, 19, 7:19 PM
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Ron
 
Join Date: Jul 2005
Location: stockton,ca
Posts: 3,996
Re: First Passes on Nova with MJ467

Quote:
Originally Posted by VORTECPRO View Post
Fontana has a 28.8 baro, that area has horrible air, Sacramento has a 30 plus baro, and great air, that right there is the difference, major HP difference between the two tracks. My point is your not going to make HP in a 28.80 baro with a pypes exhaust system.




Sacramento:
temperature = 52.88 deg f
relative humidity = 56 %
uncorrected barometer* = 30.16 inHg
corrected barometer* = 30.24 inHg
wind speed = 7.57 mph
wind direction* = NW (334)
more info: current metric | historical | forecast | help
dew point = 38 deg f
saturation pressure = 0.403 inHg
vapor pressure = 0.226 inHg
grains = 32.8
air density (w/o water vapor) = 102%
air density (w water vapor) = 101%
density altitude = -490.34 ft


Fontana:
temperature = 58.92 deg f
relative humidity = 28 %
uncorrected barometer* = 28.80 inHg
corrected barometer* = 30.00 inHg
wind speed = 5.42 mph
wind direction* = NE (67)
more info: current metric | historical | forecast | help
dew point = 26 deg f
saturation pressure = 0.502 inHg
vapor pressure = 0.141 inHg
grains = 21.3
air density (w/o water vapor) = 96%
air density (w water vapor) = 96%
density altitude = 1390.24 ft


I guarantee there is 50 plus HP observed on the dyno between Fontana and Sacramento in these type of conditions. When the baro is over 29.92 you are super charging the NA engine for free.






Hey Mark what did you not like about his exhaust system?
WHT/73 likes this.

69 Camaro
491/AFR 315/Straub hyd roller/pump 91
TH400/GV OD/9" 3.50's/ 255/60/15 DR

10.86 at 124.8
3670 with driver
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