Is there somthing wrong with my car?

**spooky** · 09-15-2007, 07:42 PM

Well about 6 or 7 months ago i took my 99 z28 to the track. All it had done was rims i ran a 8.6 sec 1/8 at 83 mph 2.2 60 ft good reaction. So far i have added a 3 in y pipe, 3in exhaust, a MAF, free mods, ported TB, and intake. It has air suspension in the rear so i can dampen the rear suspension. Well last night me and my buddy went to the track and the best i ran was a 8.902 @81.2 mph my reaction was .027 and 60ft was 2.1 with my buddy in car. Without him in the car i would run 9.0 to 9.1 and 60 ft at 2.0 and a 2.1 the mph was a little faster but mid track it seemed to be lacking. the outside temp was real close to the same.

I don't know why it is running slower any help would greatly appreciated.

P>S its still faster than those GTs i beat all ot them at the track except a 03 cobra which i knew better anyway.

**Y2KPewterSS** · 09-15-2007, 08:09 PM

What MAF did you put on? Its usually a bad idea to put an aftermarket MAF on. The factory MAF is good for 500 HP.

**spooky** · 09-16-2007, 06:17 AM

it's a SLP MAF. Would it make that big of a differance?

**Y2KPewterSS** · 09-16-2007, 07:50 AM

Originally Posted by spooky

it's a SLP MAF. Would it make that big of a differance?

They can. Try putting your stock one back on and see how it runs.

**LETHALxLS1** · 09-16-2007, 01:29 PM

slp maf is trash

**SeVeReDiStOrTiOn** · 09-16-2007, 02:40 PM

Originally Posted by BREAKxNECKxSPEED

slp maf is trash

**aerojt** · 09-16-2007, 02:46 PM

Originally Posted by SeVeReDiStOrTiOn

Seems like it would be better in theory though. Plastic so the air is cooler, larger for more volume, who knows. I always thought they would help, wonder why not?

**greatwhiteZ28** · 09-16-2007, 03:07 PM

well to make it bite better add more air to the right rear air bag, making it better for launching, ive heard people just buying air ride for that purpose

**spooky** · 09-16-2007, 06:17 PM

The suspension is air ride but not air bags so when i put more air in they both air up. I didn't buy it the previous owner did. thet look like regular struts unles the car is jacked then you can see the rubber. I had them soft so they would give a little and the tires were 25.5 psi. it griped good on the line but at about the 10ft mark is were it started to slip. I have an A4.

**thecorrectformula** · 09-16-2007, 06:51 PM

Most of your problem is your probally pushin the limit to where you need a tune to bring all your perameters back in to specs. That'll help out alot.

And not a hand held programmer, get it custom tuned. Either dyno or street tune.

**LETHALxLS1** · 09-16-2007, 08:24 PM

I believe the slp maf leans the car out too much-not positive-BUT I do know that everyone I talked to that put one on wound up putting the stocker back on.

**35thAnniZ28** · 09-17-2007, 09:48 AM

the maf messes with timing ..correct?

**spooky** · 09-17-2007, 12:09 PM

Thinks guys! I plan on getting a cam when i get back from iraq which should be around christmas. I will get a tune then as well. Untill then no more racing for me