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oregonchevelle
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PostPosted: Sun Feb 19, 2006 12:38 pm    Post subject: Advice needed Reply with quote

I run a 3600 lb 66 chevelle. It is a street car that I have been taking to the track. I run a Richmond T-10 4 speed and it has a 355 with TFS aluminum heads and performer edelbrock intake with 1406 edelbrock carb. Compression is supposed to be 9.4 or 9.8 to one. It is an older summit motor (they don't even make this version anymore) and they sent me the info but had different compression depending on which paper you read. Heads paper says 9.4 Compression info paper says 9.8 Heads have 2.02/1.60 valves and the cam has a 454 lift with 216 dur @.050. Centerline is 112. I am wondering if this is the best combination for the motor. I am wondering if their are any changes that can be made to give it more power. My present 1/4 mile bests hav been 13.90 and 100MPH with a 60ft best of 2.14. Not all of those on the same run. My rear gears are 3.08 and I know I need to get better gears there for sure.
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96capriceMGR
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PostPosted: Sun Feb 19, 2006 1:28 pm    Post subject: Reply with quote

Seems to me heads like that would benifit from a little more intake. I had a Peformer and loved it on a 305 in a 4X4 truck. I am not suggesting single plane but a Performer RPM or AirGap would better serve you.

If you could get it to hook and give it some more gear there is a lot of ET left there, my top MPH is 101.xx with a much heavier car with an ET of 13.2, 60ft. times of 1.8 was with a 2800 stall, 3.42s but my 4L60E has a good 3.06 first gear. So I think a bit of gear and traction would probably be the best thing you can do for your ET.
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clay
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PostPosted: Sun Feb 19, 2006 4:12 pm    Post subject: Reply with quote

I would concentrate all efforts on the 60' time to begin with. With a 2.14 time there is a lot left on the table. 3.08 wouldn't be that bad with an automatic, but a 4 speed could probalby use more gear on launch. 3.55's or 3.73's with 26" slicks and 28" street tires would probably be a pretty good combination. Clay
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Sun Feb 19, 2006 11:21 pm    Post subject: Reply with quote

Try to dial in your combination before changing the motor. Get the car to hook first then work on making more power.
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oregonchevelle
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PostPosted: Mon Feb 20, 2006 1:06 am    Post subject: Reply with quote

Well my problem is that when it hooks it bogs and runs slower than when I spin a bit.
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jonny_b
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PostPosted: Mon Feb 20, 2006 8:04 am    Post subject: Reply with quote

Your combo sounds alot like mine. I have a 355 with the TFS heads, 750 cfm carb, Luinati .480lift cam, RPM Air-gap. With those heads you could definatly benifit from more cam and carb.

The bog you're experiencing is probably coming from your over all combo. With that heavy of a car, that low of the rear gear and a manual trans there just isn't enough torque at that low of an RPM to move the car. However it could also be that your carb just isn't tuned properly.

I would start with an increase in rearend ratio 3.55 or 3.73 for a street/strip car, 4.10's for a strip/street car. Also be sure to add a positraction unit while you're at it, if you don't already have one.

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85GMCstreetbeast
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PostPosted: Mon Feb 20, 2006 9:20 am    Post subject: Reply with quote

Id say go with the 3.73's to keep your mph up and what are your lanuch rpm's?
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oregonchevelle
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PostPosted: Mon Feb 20, 2006 10:14 am    Post subject: Reply with quote

I do have a posi but it is the 8.2 ten bolt so I am a little leary of building it up. I launch from 4000-4500 so pretty high.
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PostPosted: Mon Feb 20, 2006 10:36 am    Post subject: Reply with quote

What rpm are you trapping at?
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oregonchevelle
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PostPosted: Mon Feb 20, 2006 10:48 am    Post subject: Reply with quote

about 5000-5200 but only in third gear.
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SMOKEmUP
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PostPosted: Mon Feb 20, 2006 11:02 am    Post subject: Reply with quote

That's probably pretty close to where you want to be with that motor. I'll bet it makes peak power around 5500 RPM. Like everyone else said I think gears will help the launch and ET.

Regarding more power a bigger cam will help but won't drive as nice. If you like the cam you have now swapping on a set of 1.6 rockers will gain some extra valve lift and take advantage of the flow potential in your heads (5 - 15 HP gain as a guess). A bigger cam will make more power for you but hurt overall driveability.

What kind of exhaust do you have?
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oregonchevelle
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PostPosted: Mon Feb 20, 2006 11:32 am    Post subject: Reply with quote

Exhaust is flowtech headers with 2&1/2 inch exhaust. I have the h crossover after the collectors and Magna flow mufflers.
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1979 Chevrolet Camaro

PostPosted: Mon Feb 20, 2006 12:03 pm    Post subject: Reply with quote

oregonchevelle wrote:
Exhaust is flowtech headers with 2&1/2 inch exhaust. I have the h crossover after the collectors and Magna flow mufflers.

That should be good.

What are your goals for the car? How fast do you want to run? How streetable ?
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oregonchevelle
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PostPosted: Mon Feb 20, 2006 1:12 pm    Post subject: Reply with quote

I want it to be streetable but I am not worried about going on big trips or anything with it. It is a town cruiser and fairly frequent track goer. 5-6 times a year. Goal for times in the 1/4 are low 13s to high 12s. It has ran a best of 13.9 at 100mph so far. Although I think the 13.9 was actually 98 or 99mph. So basically I am looking to take about 1 second or so off the present best.
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PostPosted: Mon Feb 20, 2006 3:28 pm    Post subject: Reply with quote

To drop a full second you'll need to get the car to hook.

Power wise you're making about 245 RWHP:

Vehicle Weight - 3600 (lbs)
Trap Speed - 100 (mph)
Drivetrain Loss - 18 (%)

Results:
Rear Wheel HP - 244.4
Crankshaft HP - 298

Based on your goals I'm guessing your car will need to trap around 108 MPH.

Vehicle Weight - 3600 (lbs)
Trap Speed - 108 (mph)
Drivetrain Loss - 18 (%)

Results:
Rear Wheel HP - 307.9
Crankshaft HP - 375.5

So in a nutshell you're looking to pick up approximately 75 HP at the crank and be able to put that to the ground. Therefore I would say a cam, manifold, and bump in compression should do the trick.
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