barely beating a stockish 4.6
05-08-2016, 01:23 AM
#1
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barely beating a stockish 4.6 Hey guys I just rebuilt my 94 z28 it's stock heads, displacement with a cc306 cam with lunati, springs retainers, locks, 1 3/4 runners to 3inch collectors open headers, built th350, 3500 stall, but still stock 273 gears. My buddy has a stockish 04 gt n we ran from a 45 n I barely pulled him I did more when I was stock my question is is the 273s hurting me that bad? Need advice bad Thanks in advance
05-08-2016, 01:35 AM
#2
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Did you get it tuned? If not it's a miracle you didn't lose; just because it sounds good and lopey doesn't mean you're making power, the 2.73's also are killing you.
05-08-2016, 01:53 AM
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No Its not tuned yet I'm still waiting on a few things before the tune. I just thought it would least beat him by a few cars. I think maybe 390s or something would help get the cam in it powerband quicker. it seems real sluggish with 3 speed now
05-08-2016, 04:32 AM
#6
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1 3/4 runners to 3inch collectors open headers
That is why your car will not hold an idle. The O2 sensors are too close to the open air. Add some length to the collector be it bullet mufflers, x pipe or just some 18 inch long pipes. I drove a CC306 on 2:73s with a 6spd in one of my formulas when my 4:10s grenaded and it was like trying to kick water uphill unless I wanted to do a 65 roll in 1st. There is a lot of hate for PCM4Less but I had a good experience so I have no problem telling you that it will at least get you in a better place than you are in now.
That is why your car will not hold an idle. The O2 sensors are too close to the open air. Add some length to the collector be it bullet mufflers, x pipe or just some 18 inch long pipes. I drove a CC306 on 2:73s with a 6spd in one of my formulas when my 4:10s grenaded and it was like trying to kick water uphill unless I wanted to do a 65 roll in 1st. There is a lot of hate for PCM4Less but I had a good experience so I have no problem telling you that it will at least get you in a better place than you are in now.
05-08-2016, 05:14 AM
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Ok thank yall for the advice I guess I'll go with some 390s or 410s exhaust n a tune from lt1 tuning or pcm4less and see what happens. I would think id be able to walk him when its done. What do you think the setup should run in a 1/4 after that
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05-08-2016, 06:58 AM
#8
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With 4.10's your top speed is 130mph if you hit the PCM limit. I don't think the stock bottom end can handle the 7K rpm. What pistons/rods/bolt/studs are you running?
If you limit your RPM to 6300 (which might not be enough with stock cubes and that cam) you'll max your speed at 117mph with 4.10's. With 3.90's you're at 123mph. And with 3.73's you're at 129mph. Of course this is with the stock diameter tires and no converter slip...... Taller tires will get the speed up, but converter slip will drop it.
Definitely get that tune. The fueling with that cam is much different than stock. And either get the exhaust finished or run open loop (with a good tune).
If you limit your RPM to 6300 (which might not be enough with stock cubes and that cam) you'll max your speed at 117mph with 4.10's. With 3.90's you're at 123mph. And with 3.73's you're at 129mph. Of course this is with the stock diameter tires and no converter slip...... Taller tires will get the speed up, but converter slip will drop it.
Definitely get that tune. The fueling with that cam is much different than stock. And either get the exhaust finished or run open loop (with a good tune).
05-08-2016, 08:37 AM
#9
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That is why your car will not hold an idle. The O2 sensors are too close to the open air.
Finish your exhaust make it leakproof, get gears good tune youll walk your buddy pretty bad. Fun stuff
05-08-2016, 12:28 PM
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Okay thanks guys I'll do that. It's just fresh rebuilt stock bottom end. New crank clevite bearings stock rods n pistons new rings etc. I mainly just rebuilt it for this summer my goals are a forged 396 with afrs n good size shot. Top end doesn't really worry me too bad I'm wanting to beat people so bad it wouldn't matter by then and high rpms don't matter as I live in a small town and I go to the track in Bristol or over to Johnson city Tn to race once a month. What would be the best gear for my setup? I'll be running 315/60/15 tires. I see our cars with bolt ons Rollin coyotes n after that I ran that close to a 2v i lost a Lil love in my car I need to get right. So if anyone can point me in the direction of a tuner n good gear for my setup please let me know.
05-08-2016, 03:31 PM
#11
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Dude you have one of the worst possible combinations.. CC 306 with no tune, open headers without at least an extention off the collectors, and a TH350 with 2.73 gears.. You are going to wash them new rings from running rich.. Get a tune with 3.73's at the minimum..
05-08-2016, 05:55 PM
#12
You shouldn't even be driving it untuned....
As others stated your overall setup is a combination of several pretty poor choices, highway gears, big azz cam with stock heads, incomplete exhaust system, and to top it off untuned...I'm surprised the 4.6 didn't smoke you!
As others stated your overall setup is a combination of several pretty poor choices, highway gears, big azz cam with stock heads, incomplete exhaust system, and to top it off untuned...I'm surprised the 4.6 didn't smoke you!
05-08-2016, 10:20 PM
#14
Not even worth chasing the tune, valvesprings, and stall brand since the combo itself will never perform properly as-is.
You have an old lazy lobed cam with no low end, stock heads that dont let it breathe up top (the only place it would make power on a 350), and the worse accelerating gears possible for an NA build.
You are lucky you even won, lol.
You need to port your heads and add more gear...or just go to a smaller cam. A custom 22x/23x cam from AI or LE will idle better, be easier to tune, and run quicker in the 1/4 then the cc306 without changing anything else but the tune.
Cheapest way to get your car to run better is to sell the 306 to someone else then spend the $300 on a custom stock shortblock grind and another few bucks for at least a mail order tune.
If you are dead set in keeping that cam for whatever reason even though its a poor choice for a stock cube build then port your heads, install at least 3.73 gears, and get a dyno tune.
You have an old lazy lobed cam with no low end, stock heads that dont let it breathe up top (the only place it would make power on a 350), and the worse accelerating gears possible for an NA build.
You are lucky you even won, lol.
You need to port your heads and add more gear...or just go to a smaller cam. A custom 22x/23x cam from AI or LE will idle better, be easier to tune, and run quicker in the 1/4 then the cc306 without changing anything else but the tune.
Cheapest way to get your car to run better is to sell the 306 to someone else then spend the $300 on a custom stock shortblock grind and another few bucks for at least a mail order tune.
If you are dead set in keeping that cam for whatever reason even though its a poor choice for a stock cube build then port your heads, install at least 3.73 gears, and get a dyno tune.
05-09-2016, 02:40 AM
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Not even worth chasing the tune, valvesprings, and stall brand since the combo itself will never perform properly as-is.
You have an old lazy lobed cam with no low end, stock heads that dont let it breathe up top (the only place it would make power on a 350), and the worse accelerating gears possible for an NA build.
You are lucky you even won, lol.
You need to port your heads and add more gear...or just go to a smaller cam. A custom 22x/23x cam from AI or LE will idle better, be easier to tune, and run quicker in the 1/4 then the cc306 without changing anything else but the tune.
Cheapest way to get your car to run better is to sell the 306 to someone else then spend the $300 on a custom stock shortblock grind and another few bucks for at least a mail order tune.
If you are dead set in keeping that cam for whatever reason even though its a poor choice for a stock cube build then port your heads, install at least 3.73 gears, and get a dyno tune.
You have an old lazy lobed cam with no low end, stock heads that dont let it breathe up top (the only place it would make power on a 350), and the worse accelerating gears possible for an NA build.
You are lucky you even won, lol.
You need to port your heads and add more gear...or just go to a smaller cam. A custom 22x/23x cam from AI or LE will idle better, be easier to tune, and run quicker in the 1/4 then the cc306 without changing anything else but the tune.
Cheapest way to get your car to run better is to sell the 306 to someone else then spend the $300 on a custom stock shortblock grind and another few bucks for at least a mail order tune.
If you are dead set in keeping that cam for whatever reason even though its a poor choice for a stock cube build then port your heads, install at least 3.73 gears, and get a dyno tune.
05-09-2016, 02:44 AM
#17
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