random-strike

its been a while since I've owned a lsx car. but I got a 2000 SS Camaro a couple days ago. been fixing some problems it had, mostly misses from broken spark plugs (guy tried to monkey them in I guess, cracked at least one of them)

anyways, my dad bought one about a month ago, its a 99 z28...

his has 173k and mine 83k

the z28 has a lid, a straight through cherry bomb type muffler
ss has SLP center exit exhaust

the z28 is MUCH snappier, has a lot more low / mid range... the only thing I can think of that would make the z28 that much more responsive is a good tune. its a dramatic difference...

I've had pcm4less tunes on LT motors and they were great... do you guys think a tune would make that dramatic of a difference? maybe there is still some bugs I need to work out with the ss?

the ss and z28 seem to have roughly the same top end performance (high rpm)

HCI2000SS

iTrader: (2)

Is the SS bone stock?

random-strike

as far as I can tell.

it just has the option SLP center exhaust exhaust.

the z28 is basically stock as far as I can tell to. except the lid and exhaust.

I wonder if someone put a 01+ intake manifold on the z28? I don't know how to tell the different between them I wonder if it would make that much different low/mid range

HCI2000SS

iTrader: (2)

There should be a group of numbers on the side of the intake. When you find them Google them and you should know. So the z28 has a aftermarket tune?

random-strike

....

I don't know. I was asking if a tune would make such a dramatic different in the responsiveness and low/mid range

HCI2000SS

iTrader: (2)

A good tune should make a noticeable difference. You guys should find out

random-strike

I might switch the computers and see

random-strike

I was also wondering the SS is missing the ground effects, the exhaust looks pretty bad without the piece around it on the rear bumper. is there a place I could buy just that piece?

I tried googling and ebay and couldn't find it

random-strike

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RPM WS6

iTrader: (3)

An LS6 intake alone won't make much difference on an otherwise stock car (or with no more bolt-ons than a lid/catback). However, if they did an intake + tune in addition to the lid and exhaust, that would make a noticeable difference.

Are both cars of the same trans type? If they are autos, perhaps the Z28 has a higher stall of some sort? This would make a huge difference in the low and mid-range, since you'd slip right into the powerband anytime you went WOT. If they are both M6s or even autos, perhaps the Z28 had a gear swap? That would make it feel stronger in the low and mid-range as well.

It's also possible that the SS is having other issues that are holding it back, maybe marginal O2 sensors and a dirty MAF are causing poor A/F ratio in the mid-range area, etc.

random-strike

thanks for the intelligent response.

they are both t56, I think the SS has lower gears, but not 100% sure. off the top of my head the z28 might cruise 200-300 rpm lower in 6th at 60mph. but not 100% sure. they really are pretty close.

i'm going to work through some things today after i'm done with work. clean maf, check o2s with scanner etc...

HCI2000SS

iTrader: (2)

I don't want to sound rude or condescending here but how can you and your dad not know exactly what's done to your cars? I'm just curious...

random-strike

cause we just bought them? lol.

HCI2000SS

iTrader: (2)

I get that, but didn't the previous owners know what was done to these cars?

"MAC"

iTrader: (1)

The bottom of the intakes are different. You should be able to tell by looking at it. Not only that the ls1 intake has a hole on the top of it right after the TB

random-strike

nope one was an auction, and one was some guy on craigslist who buys and sells cars.

HCI2000SS

iTrader: (2)

Gotcha! If I remember right all 6 - speed cars came with a 3.42 gear. Unless someone swapped it they should both be the same in that regard

random-strike

nice, I will check tonight

DANOZ28

iTrader: (1)

for your dads 99 , check and make sure hes done the egr mod , right after throttle body on the front of the intake 2 bolts hold a egr obstruction that can be cut. install university has photos. i think a good tune could make a big diff if your was stock.