hey all...i recently bought my 2000 z28 6spd. the guy had put an ls1motorsports air lid on. Ive been driving it around and i kept feeling as if the motor was bogging down between 2.5 - 3k rpm. i dynoed it and air/fuel ratio was 14.5 - 15. sooooooooo i decided to put the factory lid back on. it totally stopped acting lame. im kinda pissed though as to why it did it with the aftermarket lid...i mean..they are all the same pretty much. anyone else notice ever experienced anything abnormal?

 

maybe it wasnt sealed properly

 

The direct flo lid is a good piece and dynos
very well. However it is a bit tricky getting the
tabs in the first couple times so I think the sealing
issue is a possibilty. Did you dyno it afterwards also?

 

nope.....have not dynoed it with the stock lid.

however here are a few dyno sheets from my very first run.

dyno results

 

did you get a graphical readout or just numeric?

Thats very weird.. Also, why did your car lose so much from one run to another?

I find that most dyno shops charge like 45-75 for 2-3 runs and 125 an hour for how ever many you want.. I would rather pay 125 and do some lid changes and multiple runs than not.. just something I was thinking..

 

I just put a TSP lid on and I feel the exact same thing. I'll check it out to make sure its sealing.

 

well....im glad that someone is having the same issue. im not happy its doing the same thing.....but you know what i mean. I have the stock lid back on for now. Its running just fine. I'll experiment some more with the other lid this weekend.

 

I had the opposite problem - I.E. my A/F mixture was in the 12's at high RPM, or rich.

I'd agree that improper sealing might be the cause.

Oh -

Do you have aftermarket MAF ends, or stock ?

Every car seems to react differently, but it seems like my car runs better w/ the stock (screened) pieces.


I have a MTI lid - it was on the car when I bought it.


Britt

 

yep..stock maf. i hope i can get it working good with the aftermarket lid though.

 

same here, stock MAF and ends. Only that wasn't was a custom bellow, Lid wouldn't seal with that one so I had to go back to the stock bellow. Seems to seal, I checked today, and couldn't tell any leaks. I might pop in the old lid this weekend and see if it changes things.

 

Do the cigarette test. Take a lit cigarette or something that makes a little smoke and put it near the lid it should pull in the smoke if there are leaks.

 

what kind of air flow should i expect ?
mine is 13.5 on peak (4300 RPM).
i also have SLP air lid, is that ok ?

 

Nothing wrong w/an SLP lid.

 

i know nothing is wrong with it but 13.5 air flow is normal for slp lid ? or its too low ?

 

13.5 air flow?

You mean 13.5 air/fuel? A 13.5 A/F ratio is just a little on the lean side but that's fine. I wouldn't worry about it or change anything.