Brake vacume...etc
10-01-2003, 07:55 PM
#1
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Join Date: Apr 2000
Location: Edmonton,Canada
Posts: 27
Brake vacume...etc
Hello, we are finally building my 383, to be brief it has an eagle stroker kit, converted lt1 intake, corvette aluminum l-98 heads(polished/ported), lt4 hotcam, 1.6 rr, auto. My builders concern is that I might loose some vacume due to the cam i've selected. Another concern is the idle, how rough? Will it run when we first attempt to fire it up? It has a slightly modded chip. Any thoughts? Also has no emissions control. While I'm at it, any ideas on approximate hp roughly? Thanks!!
Last edited by Ivan1; 10-01-2003 at 07:57 PM.
10-01-2003, 09:22 PM
#3
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Join Date: Sep 2002
Location: New Jersey
Posts: 672
Well I've got a 350 with an Xtreme Energy 268H cam, it was supposed to be the more streetable then the 274, which many guys said can put a car in the 400HP range.
The fact that I couldn't afford a new converter and the recomendation that the 274 was too big for a daily driver forced me to take the 268, well the 268 was idling at 400RPM last night...it wasn't until we brought it down to 350 it started to stall. I am running the stock muffler with headers/ypipe and the stock cat, and it sounds DOCILE. I mean, it was idling SMOOTH as hell at 550RPM. It did NOT sound aggresive or lopey at all. I plan on getting exhaust to give me a better tone (we ran it open headers, it sounded like it wanted to kill people, with exhaust on, it sounds like a kitten)
The smoothness of the idle surprised me alot, however I am pulling 7PSI of vacuum at 550RPM. Needless to say, I am going to install a vacuum canister so my brakes will work. You can do the same thing.
If I can't run 13.7 or better on this setup, I'm going to save my pennies, buy a converter, and put the 274 in, because I want consistent 13's, I don't care if it's 13.9, but I want to be able to run 13's consistently. I just don't feel the 268 is going to do the job, we'll find out after I break the engine in and take it to the track.
I'm running a carb, fuel injection will smooth out an agressive cam somewhat. I wish I had gone more aggressive....lets hope I don't regret the 268.
The fact that I couldn't afford a new converter and the recomendation that the 274 was too big for a daily driver forced me to take the 268, well the 268 was idling at 400RPM last night...it wasn't until we brought it down to 350 it started to stall. I am running the stock muffler with headers/ypipe and the stock cat, and it sounds DOCILE. I mean, it was idling SMOOTH as hell at 550RPM. It did NOT sound aggresive or lopey at all. I plan on getting exhaust to give me a better tone (we ran it open headers, it sounded like it wanted to kill people, with exhaust on, it sounds like a kitten)
The smoothness of the idle surprised me alot, however I am pulling 7PSI of vacuum at 550RPM. Needless to say, I am going to install a vacuum canister so my brakes will work. You can do the same thing.
If I can't run 13.7 or better on this setup, I'm going to save my pennies, buy a converter, and put the 274 in, because I want consistent 13's, I don't care if it's 13.9, but I want to be able to run 13's consistently. I just don't feel the 268 is going to do the job, we'll find out after I break the engine in and take it to the track.
I'm running a carb, fuel injection will smooth out an agressive cam somewhat. I wish I had gone more aggressive....lets hope I don't regret the 268.
10-01-2003, 09:37 PM
#5
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Join Date: Sep 2002
Location: New Jersey
Posts: 672
Originally posted by aklim
Slightly modded chip? Is that an off the shelf one or a custom one? To get the max out of it, you need a custom one. One that was derived from modifying the program and taking readings and making changes till it is on right.
Slightly modded chip? Is that an off the shelf one or a custom one? To get the max out of it, you need a custom one. One that was derived from modifying the program and taking readings and making changes till it is on right.
Say bye to your $$$$$$$$$$$$$$$
10-02-2003, 02:06 PM
#6
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Join Date: Mar 2001
Posts: 3,249
How so? You could use the mass air and it will compensate to a point but that is still using the stock program which is not optimised for that system. You can get a custom EPROM for $350 when you would be buying the stuff for about as much and you wouldn't get it dialed in as good as people who have been doing it for years. You would then have a hunk of electronics which is sitting on your shelf till you do enough significant mods that require another burn. It would take you many more times to do it till it gets close or maybe right. Figure in what your time is worth in the equation.
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