3Whips

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.

96capricemgr

iTrader: (1)

If it is that rich it could hurt the shortblock.

Does it have a 700R4 or a 4L60E? The shift points are controlled differently between the two.

3Whips

700r4

96capricemgr

iTrader: (1)

Why would it have a 700R4?

3Whips

Because that's what the original owner wanted?

Wheelman916

Ditch the catalytic converter and get it on a dyno. No point in speculating until someone has had a deep look at the tune.

3Whips

Trying to get it dynoed soon.

moehorsepower

iTrader: (3)

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.

Shownomercy

iTrader: (1)

How many threads are you gonna make about the basketcase you bought?

Purple Poncho

iTrader: (1)

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.

3Whips

I have no idea what you're trying to say. No where did I say I was hammering on the motor? And I've actually been getting the car fixed? I just got the supercharger rebuilt, a housing seal replaced, the exhaust leak fixed. So you saying "black smoke is coming out then quote lol"? Ya you don't make sense.

BALLSS

I believe MoreHP was referring to your statement of it running rich as you have black smoke out the tail pipe

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

ahritchie

iTrader: (1)

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.

93M6Formula

Honestly like I stated in one of your other threads, I would be ditching all that outdated stuff and start fresh. A lot of that stuff is holding you back IMO.

3Whips

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.

3Whips

I spent around 1.3k rebuilding the supercharger, it was sent off to the place that does the older paxtons now and they completely rebuilt it, it was done right. I'm going to get it dyno tuned real soon.

ahritchie

iTrader: (1)

Hopefully it will push more than 4-6 #s of boost now....that's barely worth the extra hassle and expense of a SC. I believe the old crappy non-intercooled Powerdyne superchargers would make that much boost and they only add like 50-60hp.....enough to keep up with a stock LS1! LMAO

An intercooler would be a worthwhile investment if you do keep it.