Just got my car out of the garage yesterday after the installation of LG Pro Headers, pulley, G5x3 cam (114), 3500 vigilante converter.. Car already has a Halltech CAI and Borla cat-back.. My car is a 2005 A4 Z51 coupe

Met up with a fellow C6 owner and decided to race on a closed private strip.. He complained about his tire tread and asked for a rolling race 50mph to 160mph.. I was so excited I would've said yes to anything! His C6 has a K&N CAI and Kooks headers.. His car is a Z51 M6

On all four successful attempts I was only able to jump a few inches ahead and maintain that gap all the way to 160mph.. I was not able to pull away what-so-ever.. The remaining attempts were all cases where the other C6 mis-shifted and the owner asked for a re-run!

Yes, my gear ratio is 3.15 as opposed to 3.42
Yes, I had a passanger which added about 150lbs to the weight of the car
Yes, my tune is VERY basic (raised idle airflow and idle). I haven't properly tuned the converter yet either..
Yes, I wasn't supposed to stomp the vehicle a few hours after getting it out of the garage but I'm 24 and resisting temptation at such an age is a challenge I wasn't up for so please don't flame me!

I understand that a rolling race from 50+mph would definately give the MN6 an advantage over the A4..

.. Still, I feel as if I was supposed to be able to pull away despite all of those factors! Am I making sense here or am I freaking out needlessly?!

 

With these stuff your car should be fast as hell! a few inches!! damn.. the LG alone gains like 35 HP right? I say your car has +495 HP. Before 2 weeks I raced with a friend of mine.. My C6 (Auto. Transmission) is Completely stock. he drives a 2001 C5 Headers and VaraRam air intake system he pulled for like 5-7 cars away from me and that is only from the headers and the vararam. dude you should take your car to some expert mechanic to check it for you. That's my opinion..
Thanks.

 

You probably need more gearing for that cam... + The passenger is 1-2 cars...

 

I'm assuming you read my post thoroughly and understand that the other car wasn't stock either

 

I agree, I need more gearing + proper tunning too...

The thing is, I find it quite hard to maintain traction at WOT if I'm going less than 35mph.. Starting from a complete stop would be ideal for a setup like mine as opposed to a rolling start.. Thing is, I will only be able to properly launch the car with drag radials and it'll be quite expensive to have to replace those every 3-5k miles plus they're not available where I am and shipping them will cost a fortune (wouldn't of been a problem if it was a one time thing).. Other thing is, I don't think any manufacturer makes drag radials for 19" and even if they do, the tire's side-wall wouldn't be a big as the side-walls you get on drag radials made for a smaller size rim, which will provide better traction.. I know for a fact that I would get a substantially better E/T than the C6 I've raced in the 1/4 with slicks on but what would be my best option when it comes to rolling starts and racing on street-like conditions!?

 

if you saw a car has headers and air intake system.. Do you call it "FAST CAR"?
With only your cam, you should spank his z51 and I also agree with xstang.

 

With only my cam I wouldn't be gaining much.. A cam will only provide me with the gains anticipated out of a cam-swap if the engine's 'breathing' mechanics are improved (headers, CAI)..

My question was about what the 'expected' outcome should be out of a rolling-start race, 50mph to 160mpg, with my A4 z51 against an MN6 z51 taking into consideration the conditions of the race (rolling-start + extra weight) but also taking into consideration my specs vs. his (3.15 vs. 3.42 + untuned G5X3 vs. stock cam)..

 

uhmm.. I really dunno .. But I am sure that you will win 3-4 cars away!
Why don't you try to install a Pulley?

 

I'll be scanning and tunning the car later on today.. I hope that results in some nice gains!

 

You need a proper tune for that cam. I gained 20 hp with a tune after putting in a 224 cam into an LS1.

 

I thought the Z51 mn6 gearing was 3.73?

 

Nope 3.42's, from factory..

 

PROPER tune is a must!

 

rgcarmack, the Z51 has a different trans gearing than the base car which they say makes the car launch like it has a 3.73 gear.

I would definitely say that the tuning of the car will make a big difference. A car that has just had a cam and headers installed is probably not running properly at all without a tune!

 

Tune

 

I would check your tunning on your TCM, after you get a Touqe Converter tunning is a must otherwise the TM freaks out, for some resean you have to almost remove all your TM to get the full effects of the TC. The extra person played a factor and you probley would have crawed away with just one person.

 

Alot of variables here. Are you sure that the mods listed ae the only ones the other guy has? Next, yes the passenger slowed you a bit, but the weight becomes less significant the faster you go, so if you hit it from a roll, it shouldn't hold you back that much.Next, as far as your cam, is it a grind just for higher HP on the dyno(i.e. a HP spike to a higher #) or does it have good, consistant pull throughout the entire RPM range? If you have a cam, why would you not go ahead and get a tune, though? You're probally running either too lean or too rich and not optimizing your mods.

 

hey guys I'm back..

tune made all the difference in the world.. I still haven't used a wideband to calculate a/f at WOT and partial throttle but that'll be done sometime this weekend hopefully.. Still, I managed to zero out my LTFTs at WOT and knocked out knock.. Adjusted my TCM (although I still need to finetune my locking/unlocking speeds slightly).. Modified the timing table and changed some MAF settings.. TM is completely out now as opposed to reduced in yesterday's tune..

I've got so much to say but I'm tired and have work tomorrow,,

I'm looking forward to this weekend.. Planning on SD tunning the thing to get the VE table right and then I'll decide whether I'd wanna run mafless or not..

.. tonight I don't sleep disappointed

 

Good to hear that it feels better, let us know if you get a chance to run that car again!

 

With out a proper tune, all the bolt ons in the world wont give you more then a few ponies.