[Dagstar]

Well, started about a year ago with a Borla axleback, Pray ported IM/TB, and Roto Fab. Then I bought headers, never had them installed, and wound up with what's below.

I took it back to stock (besides axleback) and the baseline was 366rwhp/380lb-ft tq on the same dyno as numbers below, about a week apart. I thought that was a bit low even for the A8.

Pic is junk, new mods put her at Max Power: 608.87 Max Torque: 621.58

Mods:
Whipple 2.9: stock pulleys (redesign with 3.625 upper)
AlkyControl kit
Roto-Fab Big Gulp
Nick Williams 103 TB
LT4 HPFP
LT4 Injectors
LT4 in-tank pump
Kooks 1 7/8" headers, no cats
Borla S-Type axleback + x-pipe + resonator(basically their catback kit)

Some thoughts:
The shop I used only works on GMs, always a bunch of Vettes, Camaros, and a few Caddy's around. We both were adamant about a conservative tune due having the SBE.

I definitely have the Whipple rattle at idle. The instructions do say it's normal and will eventually go away so I'm not flipping out about it for the time being.

The car feels like there's a very fine line between gradual somewhat quiet acceleration and just taking off with the exhaust blaring (around 1500rpm). Is that just the nature of a PD blower? I knew I was going to have to relearn how to drive it, but I'm barely touching the pedal and it thinks it's "go time".

[KingLT1]

Congrats on the Whipple setup!

The rattle will quiet down some, but it won't go away...especially with a large pulley and the low idle rpm. What you are hearing is lash in the gears. Raising the idle and or lowering the pulley usually helps a lot. Most Whipple cam cars running 12+ psi you don't hear any rattly just whine.


The light switch throttle is all in the tuning. Mine isn't like that at all and I have a 3.375 pulley.

[MSU120]

Congrats. Very nice numbers! Enjoy.

[Joshinator99]

Nice setup and congrats! With your fueling and intake setup, you definitely have the headroom to spin the blower a little harder. A griptec 3.50” or 3.375” upper pulley would be a nice addition.

[mcar00]

Great results!

Which Florida shop did you use and would you recommend them?

[Dagstar]

Originally Posted by mcar00

Great results!

Which Florida shop did you use and would you recommend them?

Powertech Performance in St Pete. They do a lot of high performance GMs around here and I've only heard positive about them. They took care of a few things quickly with my supercharger and could have just told me to deal with it since I didn't buy it through them.