| Slant Six Forum https://slantsix.org/forum/ |
|
| 650 base tune https://slantsix.org/forum/viewtopic.php?t=53592 |
Page 1 of 1 |
| Author: | Junior [ Mon Oct 14, 2013 8:36 pm ] |
| Post subject: | 650 base tune |
what jets are yall starting out with? i have a 650dp and was wondering. |
|
| Author: | Junior [ Mon Oct 14, 2013 9:25 pm ] |
| Post subject: | |
stock motor, stock head, stock compression ratio, comp cams 264s, 8psi. |
|
| Author: | Reed [ Mon Oct 14, 2013 10:24 pm ] |
| Post subject: | Re: 650 base tune |
Quote: i have a 650dp and was wondering.
I think your problem is the carb, not the jets. 650 CFM is WAY to big for a motor that is stock other than a cam. You would be better served stepping down to a 390 CFM Holley or a two barrel carb.
|
|
| Author: | Junior [ Tue Oct 15, 2013 12:24 am ] |
| Post subject: | |
i have read on here that other people are using them for blowthrough and they are working just fine with similar setups. i plan on running it as a 2bbl to start with and going from there. just trying to see where other people have started with their jetting. |
|
| Author: | Reed [ Tue Oct 15, 2013 6:08 am ] |
| Post subject: | |
Ah. I didn't know your plans were leading up to a forced induction system. Good luck! |
|
| Author: | kesteb [ Wed Oct 16, 2013 9:30 pm ] |
| Post subject: | |
It was my understanding you should select a carb to match your engine size with blow thru. That 650 DP may be too big. But you may also have a problem, since Holley doesn't list a DP carb in the 400 to 500 cfm range. |
|
| Author: | bmimken [ Thu Oct 17, 2013 5:43 am ] |
| Post subject: | |
You can get a Holley DP 390, though it is very pricey. I am currently running this carb on my car. I don't know how well it would work using a 650 DP as a two barrel initially with a blowthru setup. Let us know how it turns out, would be interesting to hear your results. Brian |
|
| Author: | Shaker223 [ Thu Oct 17, 2013 5:47 am ] |
| Post subject: | |
The 650 should work fine. I drive mine with a 600 with no problems. Every engine is different. Are you going to do the boost referenced power valve mods? If you're running only 8psi you might get away with not doing the mod however monitoring your afr is even more critical. As a guess, I'd go with 76 primary and 89 secondary. Assuming gasoline, don't stay in it if your afr is over 12.0. |
|
| Author: | Junior [ Thu Oct 17, 2013 1:10 pm ] |
| Post subject: | |
Quote: The 650 should work fine. I drive mine with a 600 with no problems. Every engine is different. Are you going to do the boost referenced power valve mods?
with all the reading ive done on the subject i was gonna leave the pv alone for now unless i need to so something with it. i dont plan on going crazy with the boost i dont wanna put a cage in my car so im gonna keep it pretty slow. If you're running only 8psi you might get away with not doing the mod however monitoring your afr is even more critical. As a guess, I'd go with 76 primary and 89 secondary. Assuming gasoline, don't stay in it if your afr is over 12.0. thanks for the advice. ill give it a shot when i get everything together. |
|
| Author: | 1974duster kev [ Fri Oct 18, 2013 7:23 am ] |
| Post subject: | |
I did the BRPV mod to my carb but it ran fine without it. I did mine to help mileage which seemed to make a considerable differnce. 22mpg hwy at the current tune 10psi. Kev |
|
| Author: | newpoppop [ Mon Oct 21, 2013 11:19 am ] |
| Post subject: | |
Nice... |
|
| Author: | Shaker223 [ Mon Oct 21, 2013 11:35 am ] |
| Post subject: | |
Quote: I did the BRPV mod to my carb but it ran fine without it. I did mine to help mileage which seemed to make a considerable differnce. 22mpg hwy at the current tune 10psi.
As Kevin pointed out, the mod should be done if there is any street driving done because the MPG will suffer with such a large primary jet.
Kev |
|
| Author: | Junior [ Mon Oct 21, 2013 6:14 pm ] |
| Post subject: | |
Quote: I did the BRPV mod to my carb but it ran fine without it. I did mine to help mileage which seemed to make a considerable differnce. 22mpg hwy at the current tune 10psi.
what kind of brpv did you run? there are many im just curious to see what worked for you
Kev |
|
| Page 1 of 1 | All times are UTC-08:00 |
| Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/ |
|