What to do to go faster?
Thread Starter
Staging Lane
Joined: Oct 2014
Posts: 50
Likes: 0
From: Iowa
What to do to go faster? So I own a 96' z28 383 stroker paxton supercharged sn2000, I'm pushing around 4 to 6 lbs non cooled. I've got a mild cam bigger fuel pump and bigger injectors. 700r4 built tranny with a shift kit. The car is badass it will turn the tires over in 2nd gear. But it feels like it is wasting power aftet 2nd gear, as the car will shift at 6500 rpms everytime... 6500 can not be the optimum shift point for every gear? The supercharger was just rebuilt and so I think it's due for a dyno tune again, and when the guy before me owned it he was the one who did the bigger fuel pump and it's still not been tuned since then. I believe the last tune it's had was around 1998 lol.... And also I'm burning realllyyyyy rich so much so you can smell it from inside the car, and I'm sure everyone behind me can too lol. I also know for sure it's burning rich because of the black smoke out of the exhaust when reved. And the exhaust i have i believe is to meet cali restrictions so i think it's restricting my flow badly, and could my cats be clogged from running so rich for sometime now?
Anyways i just feel this car can be running sooo much better and a lot faster than it is now. Any help is appreciated.
Anyways i just feel this car can be running sooo much better and a lot faster than it is now. Any help is appreciated.
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I don't understand people that come in and say their car is doing this or that but yet still keep hammering on the motor, you say it's so rich, black smoke is coming out then quote Lol, we'll my friend you won't be laughing when you have to rebuild the motor due to ring wash.
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If I was in your position I would fix your rich/tune/whatever-it-is problem first.
When you want to make some power I'd get rid of that blower unit. It is old, internally belt driven and won't push any more air than it is already. Even an old Vortech S trim would be a big leap. I don't know for sure but you might luck out and a newer Paxton head unit might fit on your kit. At the same time I would get some 60# or larger injectors and get it tuned by a pro.
When you want to make some power I'd get rid of that blower unit. It is old, internally belt driven and won't push any more air than it is already. Even an old Vortech S trim would be a big leap. I don't know for sure but you might luck out and a newer Paxton head unit might fit on your kit. At the same time I would get some 60# or larger injectors and get it tuned by a pro.
Thread Starter
Staging Lane
Joined: Oct 2014
Posts: 50
Likes: 0
From: Iowa
I don't understand people that come in and say their car is doing this or that but yet still keep hammering on the motor, you say it's so rich, black smoke is coming out then quote Lol, we'll my friend you won't be laughing when you have to rebuild the motor due to ring wash.
TECH Veteran
Joined: Apr 2008
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OP, as advised you need to get the tune right for the larger injectors as running excessively rich can cause significant engine damage
does your oil smell like gas?
Since you had your SC rebuilt sounds like you are staying with that power adder so get a good tune for the set up you have, especially with the larger injectors that if I understand you right the motor has not been tuned for yet
So you've spent lots of money so far on blowers and what not and have still neglected to get the PCM tuned? It was tuned last nearly 20 years ago?? 
And no telling how many mods have been added since; or if the original tuner was a hack and it's got a shitty tune to start with. At the very least get a halfway decent mail order tune with the mods you have; it's a little over $100.....that would help your issues quite a bit until you can get it to a good dyno tuner.
And no telling how many mods have been added since; or if the original tuner was a hack and it's got a shitty tune to start with. At the very least get a halfway decent mail order tune with the mods you have; it's a little over $100.....that would help your issues quite a bit until you can get it to a good dyno tuner. 
Thread Starter
Staging Lane
Joined: Oct 2014
Posts: 50
Likes: 0
From: Iowa
I'm not going to be changing things out now, I'm probably looking into selling it, there's something else I want. It's a fun car and worth updating but I'm going to tune it and do a few other things to it to get it in great running shape and then sell it.
Thread Starter
Staging Lane
Joined: Oct 2014
Posts: 50
Likes: 0
From: Iowa
So you've spent lots of money so far on blowers and what not and have still neglected to get the PCM tuned? It was tuned last nearly 20 years ago?? And no telling how many mods have been added since; or if the original tuner was a hack and it's got a shitty tune to start with. At the very least get a halfway decent mail order tune with the mods you have; it's a little over $100.....that would help your issues quite a bit until you can get it to a good dyno tuner.
And no telling how many mods have been added since; or if the original tuner was a hack and it's got a shitty tune to start with. At the very least get a halfway decent mail order tune with the mods you have; it's a little over $100.....that would help your issues quite a bit until you can get it to a good dyno tuner. 
An intercooler would be a worthwhile investment if you do keep it.