C5natie

iTrader: (1)

Hey guys, Ive had my car back from the shop about a month but I hadnt posted anything yet. We had a rocker arm break on us two weeks ago. It was a Scorpion brand rocker and I just wasnt a strong design, not enough meat. So, I upgraded to some Harland Sharps. Anyway, just before that I took it to the 1/8mi track at Irwindale. I couldnt hook up with the Nitto Extremes, even @ 15psi. So, I couldnt stall and launch it hard out the hole but we did okay. Here are the mods and times:

2002 A4 Coupe
AFE CAI, 90mm Fast intake ported, 90mm tb, trick flow heads milled to 60cc 11.3:1 comp, 228/234 112 cam, Harland Sharp rocker arms, patriot gold springs shimmed, 3600 stall Yank tc, 3.42 gears, tuned by LSX Master George Chavez @ Express Auto.

1/8mi Time
RT .919 (horrible I know!)
60ft 1.76
330ft 5.04
1/8mi 7.64
MPH 95.01

C5natie

iTrader: (1)

Anyone going to Irwindale this week?

travie319

iTrader: (1)

Nice times....

ae13291

iTrader: (8)

why do u have to shimm the valve springs??? i just wanted to know i was never sure why they do that?? do u have to shim for the after market rockers?

C5natie

iTrader: (1)

Its to bring up the valve pressure so that you dont get valvefloat at high rpm's. I already had those springs so instead of buying new ones we were close enough on pressure to just use shims. Gotta know what youre doing cause they do take a little lift away, gotta make sure youre still in the green.

gold98Z28

iTrader: (7)

not a bad 60' for nitto's, good times

97ssCDB

iTrader: (5)

Good times... I hate that 1/8th mile. Its like a tease your just getting into it and its time to shut it down.

C5natie

iTrader: (1)

And those arent the drag radials. Wait till I get some slicks!

C5natie

iTrader: (1)

I hear ya but this is the best thing during the week. But hey, you always got the freeway.

gold98Z28

iTrader: (7)

should be a monster.........

ae13291

iTrader: (8)

thanks for clarifying, so do i need to shim the brand new springs? im going to start my own cam install soon, but i never heard much about shiming brand new springs?

1SLO6

iTrader: (8)

yes Nate your set up came up stout... lets c who rolls up for a run at Irwindale Thurs. nite.....

gold98Z28

iTrader: (7)

it depends on what cam you are running, and what they recomend for seat pressure and open pressure. you need to know what they recomend for seat pressure first, and know what pressure the spring is rated at what installed hieght.the spring will say something like (just an exaple) 225# @ 1.800, so at one point eight inches the pressure will be 225. if its installed at a lower hieght(1.750) it will be more compressed thus more seat pressure, higher(1.850)= less pressure, its the installed hieght that matters, this will vary head to head, depending on how the spring pocket is prepped and what valve is in it. there is more to proper spring hieght than just putting them on or thro a shim under it........... you can also change the installed hieght with a differant offset keeper..........

sorry to hijack, back on topic. cant wait to see numbers with good rubber on her............

ae13291

iTrader: (8)

thanks alot for explaining this dude, sorry to hijack, but i just want to make sure i dont run into problems soon. i already got my cam recommendation and the specs and all! its going to be cam only car with comp gold extremes and if im not mistaken, (i have it written somewhere) the cam specs are gonna be 226/232 .613/ .6xx 113lsa thanks for the help

C5natie

iTrader: (1)

Yeah! It'll be killer with 3.73's but I wanted more top end speed for the highway so the 3.42's are perfect. I just caint wait for the 1/4mi since my trap speed is so hi. Maybe I'll still squeeze into L.A. Invasion.

C5natie

iTrader: (1)

Anytime man! Thats what we're here for, to share tech info. GoldZ28 gave you a good explanation. Regardless what the box says though, I would still take the springs off and check the compression on each one because they always seem to have a little less than advertised. Good luck and have fun with your build.