DYNO RESULTS AND A BIT ABOUT THE TUNE AND SETTINGS:

I made 3 passes each for consistency. The Tune is set "safe" to run on 91 Octane. There are two settings: 5psi, no Methanol and 7psi with 100% Methanol. We had planned on going higher with the "Meth" setting but the 6.0 gets valve float due to weak springs. That isn't as much of an issue with the 4.8/5.3 since they use the same springs but with a smaller cam. I'll end up putting better springs in which should allow an easy 9psi since even at that boost, there was no detonation.

1. Stock (with Flowmaster): 281hp/305tq

2. 5psi (no Methanol): 318hp/361tq

3. 7psi (with 100% Meth): 376hp/419tq

1. The "stock" run was done about 3 weeks ago on the same all-wheel drive dyno.

2. This run baffles me. I gained a weak 37hp over stock at 5psi!! Torque was up a little more at 56tq over stock. Still, this doesn't seem right. I'll have to check with Xtreme next week on this one. Oh, the A/F was way high at around 13.

3. This run at 7psi with the Meth gained roughly 95hp and 115tq over stock. Now that's more like it!!

DRIVING IMPRESSIONS:
- The 5psi setting feels like it's a bit slower than stock until the boost hits. Once the boost hits, it's faster, but not a LOT faster. (37hp/56tq) Again, we're going to have to figure out why the power gain is so poor. Can you imagine spending $7,000 and getting this? I will of course keep everyone posted on my findings...

- The 7psi setting with Meth is a night and day difference. The truck still feels slow from 0-20ish, then the turbo comes on and starts pushing you back. Then at about 4psi the Meth kicks in and the higher boost comes on and it pins you to the back of the seat and leaves you there until you let off the throttle! Even through the shift into 2nd gear (at about 50mph) you stay pushed in the back of your seat! Without the higher boost and Meth I wouldn't be very happy. With it, I can't stop smiling!

- The 0-20 performance: I'm running a bigger turbo (GT-67) so there is a bit more lag, but much greater mid/top end. I was going to put in a 2500 stall. This would get rid of most of the lag I'm feeling up to about 20mph. I chose not to put it in yet since the labor cost is huge. When I smoke the trans, I'll have a built trans and stall put in at the same time. After about 20mph, any time you hammer the throttle the power is pretty amazing. Especially for a heavy brick! Once the new springs are in (another $400ish installed) I will run about 9psi which will of course give more power. Maybe in the 400awhp/460awtq range??? We'll see!

- Sound: As I've heard before, this does sound similar to an aftermarket cat-back. Amazing how much the turbo muffles it, although it still allows the V8 rumble to come through. Everywhere I've driven so far, people turn and stare when I drive by. Not because of the looks, because of that LOUD turbo whine! It's hilarious!

- Future plans:
1. Comp Cams Springs (and more boost)
2. Trans/Stall
3. FMIC
4. Figure out why 5psi setting is so lean and why the power sucks so bad on this setting.

I hope this is helpful to everyone! I'll keep the info coming. I plan to do a G-Tech 0-60 today which I'll post on a new thread. 1/4 mile maybe next week.

 

Thats really lean. I know you arent maxing out those 42lb inj so why would they do that? Im not sure what can be controlled with a boost controller, but are the injectors so lean at 5lbs to keep you at the correct A/F when the meth hits? I think most stay around 11.5 in boost so 13 is pretty crazy.
My setup was alot like yours. I made no power when there was no typer of intercooling. The alky made a huge difference.

 

They relocated the IAT sensor so that it should read correctly whether boost is on or off. Mike is an excellent Tuner so I'm not sure what happened. I'll find out more Monday.

Oh, with the Meth my A/F averaged around 10.7. I'm thinking there's more Tune in it. But until I put better springs (asap) I may just have it redone as necessary at that time.

Quick question: when I'm having the new springs put in, should I do anything else in there?

 

Weedo, What's the name of that dyno shop ??? Is it a dyna pak dyno ???

 

Congrats !! theres always seems to be some fine tuning involved in FI set ups

 

Im not sure how familiar with mechanicals you are, but springs arent that hard, just very time consuming. I would do a cam at the same time. You probably will want to eventually. Since you are right there, some hardened pushrods wouldnt hurt.
Thats good to know about the A/F with meth. I was at around 11.5-11.8 with a 3.33 pulley, but went a 3.12 when I added meth, headers, cam etc. I want to go to a smaller pulley when I get a smaller belt. I wont have a wideband for a few months.

 

The shop is called AZ Dynochip and the dyno is a Dynojet.

moregrip:
Yep, always tweaking to be done! Did you ever get your truck on the dyno? What numbers did you end up with? You may have already posted but I didn't see the thread.

greentahoe:
As far as doing it myself... Lately I've left stuff like this up to the pros. I'll probably have them do the springs. I was wondering about doing the cam too like you said. Hmmm....

 

#s are really low at 5 psi. Were the pulls in 2wd or 4wd?

 

Yep, REAL low... It's all-wheel drive so all the tests are done in all-wheel drive. Regardless, a 37hp gain at 5psi of boost? Terrible...

It's going back under the knife Monday with better springs and hardened pushrods (good call greentahoe). I don't think I'll do the cam though. Gotta stop somewhere!

 

were you loging anything? what did you use for programing?

those numbers dont suprize me too much if you werent logging. you were probably seeing high IAT's and that was pulling a pile of timing and then the 13-1 a/f ratio may have let it show a little knock pulling more timing. also a higher load wich boost will show gets you into a part of the timing tables with lower numbers.

i wouldn't even bother trying to tune it without the meth, just keep that tank full.

with some tuning that thing should scream.