478 with Dual Exhaust

Message

cdsracer · #11 Post by **cdsracer** » Fri Mar 21, 2014 3:46 pm

Sounds like it runs fast! I have a pair of 478's and a 460 and converted them all over to Harley or Edelbrock injectors several years ago. The stock injectors become inconsistent when they approach ~ 50hp+ in my experience. I have some nice maps for them I could send over if you went with larger injectors. I hope you are able to dyno tune it...have fun!

riverat1540 · #12 Post by **riverat1540** » Fri Mar 21, 2014 4:03 pm

Thanks for the replies

wistech · #13 Post by **wistech** » Fri Mar 21, 2014 5:35 pm

Just a reminder of the cost of running lean on the top end with dual exhaust. I highly recomend getting a afr meter. This is from the HOD thread . A 478 that was tuned perfect for a fmf open exhaust but not retuned for the duals. It went into meltdown tacking the rev limiter on a circle track .

riverat1540 · #14 Post by **riverat1540** » Fri Mar 21, 2014 8:01 pm

QUOTE (Wistech @ Mar 21 2014, 12:35 PM) <{POST_SNAPBACK}>

Just a reminder of the cost of running lean on the top end with dual exhaust. I highly recomend getting a afr meter. This is from the HOD thread . A 478 that was tuned perfect for a fmf open exhaust but not retuned for the duals. It went into meltdown tacking the rev limiter on a circle track .

This is my worry John, I don't want this thing to burn up on me, any recommendations on injectors, the CP 98mm 2.2piston/sleeve I bought, I'm not sure what comp. ratio it is? Is there a way to tell or do I just have to keep trying to call Tim to find out, it's not domed but flat like the stocker

who_gives_a6 · #15 Post by **who_gives_a6** » Fri Mar 21, 2014 9:41 pm

This has me thinking. What's a good injector to buy to use for something like this? Also, do you need to use a custom map with different injectors? I'm all game for switching if I can help in protecting the engine.

m_mcgranahan · #16 Post by **m_mcgranahan** » Fri Mar 21, 2014 11:35 pm

QUOTE (who_gives_a6 @ Mar 21 2014, 10:41 PM) <{POST_SNAPBACK}>

This has me thinking. What's a good injector to buy to use for something like this? Also, do you need to use a custom map with different injectors? I'm all game for switching if I can help in protecting the engine.

I used a set of Harley injectors to try ethanol (Needs a huge flow to get the mix right so needed bigger ones.) Timbo has a map that is close for harley injectors on pump gas and another one for e85.

God bless...
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