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Old 08-14-2017, 06:29 PM   #121
jrvariel48
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Default Re: Vacuum signal

I just install 68 primary jets, 72 secondary jets, a 10.5 in. power valve and a purple vacuum secondary spring. Hopefully, I'll get a chance to take it for a ride tomorrow after work! If I do, I'll post the results.
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Old 08-14-2017, 07:20 PM   #122
Pete F
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Default Re: Vacuum signal

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Originally Posted by jrvariel48 View Post
I just install 68 primary jets, 72 secondary jets, a 10.5 in. power valve and a purple vacuum secondary spring. Hopefully, I'll get a chance to take it for a ride tomorrow after work! If I do, I'll post the results.


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Old 08-28-2017, 04:27 AM   #123
jrvariel48
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Default Re: Vacuum signal

I think I finally got a good tune on the carb! I'd like to hear what everyone thinks.
I have 72 jets in the primary, 76 jets in the secondary, a 10.5 in. power valve and a purple vacuum secondary spring.
At wide open throttle, as boost starts to come in, the air/fuel ratio is about 13.3.
As the boost rises to 3 lbs., it gets a little richer at 12.6
When I'm cruising in 5th gear, 65 mph, around 2000 rpm, depending on my foot, I'm getting readings of 12.9-15.3. Of course, it gets richer as I apply more throttle.
Uphill in 5th gear,half throttle, 4 barrels in and 1.5-2 lbs. of boost, I'm at 11.9-12.6
I can hear the 4 barrels come in at about half throttle.
This is with 91 octane.
Is there anything else I should be looking for?
Thanks, Joe
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Old 08-28-2017, 03:54 PM   #124
Ronnieroadster
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Default Re: Vacuum signal

Quote:
Originally Posted by jrvariel48 View Post
I think I finally got a good tune on the carb! I'd like to hear what everyone thinks.
I have 72 jets in the primary, 76 jets in the secondary, a 10.5 in. power valve and a purple vacuum secondary spring.
At wide open throttle, as boost starts to come in, the air/fuel ratio is about 13.3.
As the boost rises to 3 lbs., it gets a little richer at 12.6
When I'm cruising in 5th gear, 65 mph, around 2000 rpm, depending on my foot, I'm getting readings of 12.9-15.3. Of course, it gets richer as I apply more throttle.
Uphill in 5th gear,half throttle, 4 barrels in and 1.5-2 lbs. of boost, I'm at 11.9-12.6
I can hear the 4 barrels come in at about half throttle.
This is with 91 octane.
Is there anything else I should be looking for?
Thanks, Joe

Hi Joe
Its been a while since I have looked at your post been to busy setting records at Speedweek on the Salt Flats 216.131 MPH then let my son really get on the car 225.003 MPH but now I'm back on line looking at stuff. In my opinion what you have posted is really good your primary jet size is exactly what I run using that size carb the air fuel readings are fine I see no reason for any concern. As you posted your not looking for economy just a good running combination that's safe and with reliability I feel you have accomplished your goal. Adding to that you have also learned how to tune the combination so in the future you can help guide others when needed.
Ronnieroadster
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Old 08-28-2017, 04:05 PM   #125
jrvariel48
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Default Re: Vacuum signal

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Originally Posted by Ronnieroadster View Post
Hi Joe
Its been a while since I have looked at your post been to busy setting records at Speedweek on the Salt Flats 216.131 MPH then let my son really get on the car 225.003 MPH but now I'm back on line looking at stuff. In my opinion what you have posted is really good your primary jet size is exactly what I run using that size carb the air fuel readings are fine I see no reason for any concern. As you posted your not looking for economy just a good running combination that's safe and with reliability I feel you have accomplished your goal. Adding to that you have also learned how to tune the combination so in the future you can help guide others when needed.
Ronnieroadster
CONGRATULATIONS RONNIE!!! I read the post and I was totally blown away!! (no pun intended) That is an accomplishment that goes down in history! Well done! I appreciate the kind words, but I couldn't have done it without your help and the help of others. I also feel that I learned a lot and I'm no longer afraid to jump into something I'm not familiar with. I'm far from having a perfect tune up, but I definitely feel the improvement in the motor and I think this will be just fine for my type of driving.
Thanks again,
Joe
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