Care to share the results you speak of?

 

Here is another pic from another angle.
I'm using D513A coils, but the Yukon are D585.

I did research into these about 1.5 years ago.
Here is a youtube video of a D580 vs a D585 coil. The results were very interesting
http://www.youtube.com/watch?v=C1WH0...ture=gv&hl=en#

Here is a writeup from Megasquirt
http://www.megamanual.com/seq/coils.htm

More info again
http://forums.hybridz.org/index.php/...-coil-testing/

Coil identify sheet
http://www.msdignition.com/page.aspx?id=15358

 

The D580 coils are the LS1 coils and are less powerful than newer versions.

The coils I have (D514a) and the truck version (D585) are both next generation and better than the D580. However, between the D514a and D585 I am not sure which is better. Unfortunately, I have no information on the D513a that you use. I suspect they are all better than the D580, which will likely be better than stock or the COP's.

 

according to the information that i posted, the D585 are definitely the best coils you can get from that range of cars.

 

GTX3576r UPDATE:

The car is knocking(3 count) on the top end (>7k rpm), but initial results are 522hp on 93 octane in slightly warmer weather. Spool is equivalent to GTX3076r and the car makes 29.5psi @4093rpm in 3rd gear. I need to let the coolant burp and pull some timing on top(8deg total). I will make a run in the morning when the temp is 39F so I have comparative numbers vs. the GTX3076r. Expect results with graphs tomorrow AM in the Dyno Section.

 

Be sure to post with an overlay of the gtx3076 graph.

 

Of course, that is the whole idea

 

UPDATE:
Unfortunately, I have too may things happening at once. I am very happy with the results thus far, but i see so much more potential in the setup. I recently purchased some new goodies so I will be updating with pics and results in the coming weeks. The following items have been purchased and will be added soon:

- Purchased Enkie RPF1 rims/tires (36lbs savings)
- Purchased GiroDisk LW rotors
- Purchased Curt Brown's 10:1 built 2L bottom end
- Purchased Haltech Platinum Pro PnP unit
- Purchased Full Blown 70mm TB
- Purchased Curt Brown's new Extreme Ported stock intake w/70mm flange
- Purchased GTX3582r

The plan is to dial in the Haltech unit on speed density and then swap the built bottom end. Once I get that up a running with the new intake/tb I will then fabricate a custom 3.5" dp/exhaust. After this is complete and baseline'd I will swap to the GTX3582r and do a before after with the current GTX3576r.

I suspect with all the changes the new setup with the GTX3582r will spool as fast as my current GTX3576r. My goal is to get 25psi@4krpm in 3rd gear on pump gas and have a solid 600hp@wheels.

 

You're making me want to go back to a large frame setup... I'm thoroughly impressed by these GTX turbos. They spool like a stock frame minus the taper.

 

UPDATE:

I have been silent for a while, but still working to improve the system. Instead of working on the engine I have been addressing brakes, rims, and tires.

Since Curt Brown decided to part out his car I took advantage of some goodies I wanted to upgrade.

Installed the light weight GiroDisc rotors along with the Enkie RPF1 rims with Cont. Extreme tires. Total savings was ~56lbs vs the stock stuff I was using. While the brake were off I decided to repaint the calipers and run new SS brake lines. What a pain, but the results are great.







So now that this is done I can move on to the next phase. While the deals were still good I also purchased Curt's 10:1 2L shortblock so I can push the engine a bit harder. I will likely not swap this until June when I have sufficient time.


Once this is done I can fabricate a 3.5" downpipe and exhaust. I will then install the Haltech Platinum Pro PnP I purchased so that I can eliminate the restrictive MAF.

Final step will be the GTX Showdown Part II as I compare the before and after with the current GTX3576r vs the GTX3582r I recently purchased.

 

Nice, can't wait to see the results!!

 

UPDATE:

I made a change to the Intake Manifold going from the Skunk2/stock TB to a Curt Brown Extreme Port/70mm Full Blown TB. The intake has a 1/2" flange welded to the inlet to accommodate for the 70mm TB, which does required a minor mod to the throttle cable to account for the added distance. I will post some pics later of the setup, but below are the before/after results. No other change was made to the car for these results except manifold swap.

The results where obtained 24hrs apart with temps ~80F. The VD results are using the new settings based on reduced weight(55lbs) and new tire diameter(25"). The runs are done after the engine was running for some time. I can definitely feel the lower end torque and the idle quality is much better.

 

I have the fb 70 mounted to my skunk mani should i be worried?

 

nice gains from the intake. hp way down from jan cool runs.

 

You do see a loss in higher temps vs lower temps, which in this case is ~38F vs 80F. This affects both the cooling efficiencies and AFR, which influence power. I am also comparing a non heat soaked run vs a heat soaked run. Finally, the biggest difference is that I was running 2psi more boost in the colder climate.

Below is the comparison of the recent Skunk intake run with the graph you referenced from January(actually March).