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Post by flashlcd33 on Jan 22, 2011 13:45:48 GMT -5
Keep your duals, and run dumps right off of the headers.
On a stock 5.3 you're probably not hurting too bad, but definitely not helping. I would just about guarantee you'd pick up a few mph with cutouts.
And FWIW, dual 2.5''s is a big step up from dual 2.25s, there is a lot of volume difference in that quarter inch.
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Post by 1fast70 on Jan 22, 2011 17:35:32 GMT -5
Thanks for all the interesting discussion on this issue. I really blew it by not going 2 1/2" in the beginning, guess with the mild old school small block in the car I didn't think I'd need anything more. Keep your duals, and run dumps right off of the headers. I think that really is the best course of action for the time being. Jared does make a good point about my crappy stall converter, I don't want to lose what little bottom end I have now as this converter will suck even worse. At least with the dumps, I can experiment on the cheap and see what happens. It's gonna be awhile before I get around to changing out the converter, in fact in may not happen until I go with a larger LS engine. At that time I will also upgrade the exhaust too. Any ideas on how far back from the headers I should have the dumps? Right off them, or should I go 3" pipe like 12-18 inches and then the dumps. Does it really matter? |
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Post by Jared on Jan 22, 2011 19:14:50 GMT -5
You will be fine with just cutouts. It looks like to me you can fit them in the pipe about 3 inches past the collector and be fine.
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Post by Jake on Jan 23, 2011 0:15:12 GMT -5
Looks like its going to be hard to get them in were they wont have draging problems. Why the bigger motor? I see low 12s with a little head work and a better stall..
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Post by flashlcd33 on Jan 23, 2011 0:21:39 GMT -5
Like Jake said, it really doesn't matter where you put them, just put them where they tuck the best.
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Post by CHRIS on Jan 23, 2011 19:04:17 GMT -5
Id paint about a 2 ft long stripe right after the headers on the exhaust and where it stops burning off is where id put the cutouts at unless they wont fit there. This has been proven to pick up the most power.
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Post by 1fast70 on Jan 23, 2011 20:50:16 GMT -5
Id paint about a 2 ft long stripe right after the headers on the exhaust and where it stops burning off is where id put the cutouts at unless they wont fit there. This has been proven to pick up the most power. I have heard that before. I used a Crayola crayon back in the day on my buddies El Camino drag car. I will try it again on the Chevelle! What kind of paint would work the best? |
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Post by 1fast70 on Jan 23, 2011 20:58:22 GMT -5
Looks like its going to be hard to get them in were they wont have draging problems. Why the bigger motor? I see low 12s with a little head work and a better stall.. Someday I'd really like to see 11's out of this car just for the comedy effect. I don't think the 5.3 is ever going to do that with a single 4 bbl......... I still have lots to learn about LS engines, as my area of expertise is the classic small block Chevy. I know my converter is a big problem, what do you suggest as far as head work or better heads? Would I benefit from a more aggressive cam. My cam was a custom grind designed by Guerra Motorsports known as Patrick G on LS1tech. It is 218 intake/222 exhaust with .597 lift using EPS (Engine Power Systems) lobes and a rather wide 114 LSA. He designed the cam for a good balance between some low end torque, and good midrange/upper power. It does seem to work pretty well. |
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Post by John on Jan 24, 2011 7:27:12 GMT -5
Well, I do believe, the fastest stock bottom end 5.3 in a Silverado runs like a 12.1??? It COULD happen that you could hit 11's in the Chevelle...  |
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Post by Jake on Jan 24, 2011 21:21:07 GMT -5
A cnc ported and milled head would be the way to go, its a small motor with dish pistons so its going to be tuff. With a 300 cfm flowing head with a .050 mill and a low 230s cam with all the right bolt ons you could make 500hp. but it would be at a hi rpm, 4000-4500 stall would be needed. 11 is a bit steep for a 5.3 it would be really hard to do out here. A 6.0 would be alot easer..
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Post by flashlcd33 on Mar 13, 2011 15:00:00 GMT -5
Man this car runs great, nice to see it in action!
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Post by John on Mar 14, 2011 19:06:37 GMT -5
What did it run?
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Post by 96gtdan on Mar 14, 2011 19:58:27 GMT -5
12.90s not sure of exact #
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Post by Jared on Mar 14, 2011 20:12:37 GMT -5
Here is the Eds and Mine timeslip.  |
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Post by Jake on Mar 14, 2011 21:59:36 GMT -5
Damm thats fast for both of you. Get that 60 foot down and you got a mid 12 sec car.
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