Dave's Evo X Build/The Life of Dave blog

[Murlo26]

Are you sure your wideband is reading correctly. The power difference between 11.5 and 12.5 shouldn't be much and the start of your run looks very lean, you sure it isn't reading a point leaner than it really is or something?

Pretty confident, a few weeks ago when I was on MAP's dyno we confirmed they were reading pretty close compared to the dyno's wideband.

I am not confident it's 100% but I think its pretty close.

I also would take these graphs with a grain of salt, I haven't done any back to back runs to average it out or confirm what the car is doing on a consistent basis. And as I said the road isn't very flat so the 800 is for sure flukey I think. I can maybe believe the 750 but the 800 I think is road error or something.

My car has pretty consistently shown though that it likes 12-12.5 and seems to like 12.5 quite a bit and honestly when its leaner like that the car actually feels smoother and obviously faster. My car hated low 11's for some reason, seemed to bog and sputter some.

[Knoxville]

Just curious, during install of this turbo you were expecting sub 4K spool up. By the look of the graphs it looks like your building ~30psi around 4600-4700 RPM. Is this because you were encountering the surging at first, or can you speak to this a little more?

[Murlo26]

We were able to get it to spool before 4k, but yes it would surge and the motor at the low of an rpm cannot actually ingest the volume of air this turbo creates until higher in the RPM band. So we slowed spool down through mivec and the 3port.

Also, remember this is starting the pull at 3-3.5k rpms, so if I start the pull at 2500 it will be closer to 4k rpms.

Bottom line, its a big turbo and its a little doggy down low, but lets be honest its a t4 turbo haha.

[Murlo26]

Here you can see we can spool it faster but it becomes all out of whack when we do:

http://i21.photobucket.com/albums/b252/Murlo26/run2_zps3bfeaddb.jpg

New log taken over lunch, more boost to go steady 32psi then more fuel, starting to feel very smooth and consistent now.

http://i21.photobucket.com/albums/b252/Murlo26/moreboost_zps65f38224.jpg

[Knoxville]

Looks like you need more displacement like me!

[93gtpeater]

Why you no rev to 10k? Your set up really holds steady boost. Car looks really strong.

[Murlo26]

Why you no rev to 10k? Your set up really holds steady boost. Car looks really strong.

GSC only recommends 8500 on the gsc s2's and I am not sure what my supertech springs are rated for.

Honestly, I am sure my motor could handle 10k rpms, but the most I ever see going is 9500 for the 1/4 mile for trapping in 4th.

But if I went all honey badger it would be cool to rev it further to see what kind of power it makes lol

The shortblock is rated to 10k though I think (manley rods should be good there and the stock cranks are very stout).

I don't know I could shift up there lol.

[93gtpeater]

I am just curious as to when your car will stop making power up top. It would be nice to have it flatter up top so when you shift you stay in your peak power. One question I have is your tuning the car at 32 psi do you have any other maps/tunes for lower boost that are fine tuned

[Murlo26]

No other maps right now.

[Mark Leasure]

Much better! How does it feel with the new power?