BoneStockLs1

my tires dont spin from a stop anymore
i dont have my 02s connected yet though
normal?

ChocoTaco369

your tune is probably really off due to running very rich. how long have you had headers installed for? it may take a few days for the PCM to get used to the much richer air/fuel ratio. in some cases, the PCM won't be able to relearn and you'll have to get a custom dyno tune, or at the very least, a mail-order tune.

EDIT - you don't have your O2's connected, yet? GET THEM ON. they're going to REALLY screw up your PCM. it has no idea what the hell's going on!! you're really, really, really jumping the gun on this one!

BoneStockLs1

need the extensions for the 02s yet

1320 killer

iTrader: (6)

you need your O2's but with the 3 inch TD's your gonna lose some back pressure also

98Camarod

iTrader: (43)

Of course thats normal, you don't have your o2's connected

ChocoTaco369

lol your car's gonna run like a 4-banger until they're connected. you're lucky it even runs

98Camarod

iTrader: (43)

Without the gas mileage

ChocoTaco369

no O2's = the power of four less cylinders with the fuel economy of four more

N2OGTO

lol.....

EarlSS

Do QTP's with 3" TD's usually cause a loss of low end power? Looks to me you should gain power and torque all across the board.

BlackSVT03

iTrader: (1)

I would think that you'd lose quite a bit of low end due to a lack of (if any) back pressure.

Mine are run out the back, so I dont know, but thats what I would think.

MikeG

iTrader: (33)

You may lose a little on the low end, but of course you more than make up for it in the mid range and top end.

Your power loss is definitely coming from lack of 02's.

studderin

iTrader: (28)

Dude, I only put 6 of my plug wires on.

same thing. I htink stock wires have more low end

brad8266

iTrader: (23)

It goes into open loop operation if there are no O2's, it will run it. Your car runs open loop when you first start it in the morning too, no big deal.

brad8266

iTrader: (23)

You are correct, I dont know where this misconception ever came from anyway.

brad8266

iTrader: (23)

You are so wrong. You do not need a tune for exhaust at all. The car should run just fine and pick up power everywhere. The car will not run richer untuned, if anything it will run leaner at WOT. The PCM will have to adjust fuel trims though but that that doesnt take very long.

Ima get mines

iTrader: (3)

Haha right, what an idiot.

SSpdDmon

iTrader: (10)

WOW @ misinformation in this thread!

With the front O2's disconnected, you'll be in an open loop - fault operation mode. Chances are fueling will be a little lean, but no more than 6~8% off of what's being commanded, which would put you right around 12.7:1 AFR at WOT. There is no learning in open loop. That's why it's called 'open loop' - there's nothing there to close the loop and provide feedback to the PCM. With it being an open loop - fault operation mode, it may be reverting to the low octane timing table. That would be where the lack of power feel is coming from.

Is it detrimental that the car is being driven in open loop? Probably not in the short term due to the safety nets built into the factory tune. But, I wouldn't put off installing some NBO2's any longer than you have to.

joblo1978

iTrader: (14)

Get a tune and just delete the rear O2's. Night and day difference. I do notice a low end torque loss with the cutout open though.