N/A Power Gains - Dynos w/Mods

Same boat I was in.......... but I went 3" exhaust and long tubes.

Drove terrible IMHO, the TQ wasnt down as low as it used to be due to the excessive free flowing exhaust.

Do 1 mod at a time just in case.

 

That MotoIQ article was very helpful.

Yeah, I plan on spending a lot of time on a dyno...it sounds ridiculous in a way, being that I'm going through a lot of work on "just a truck" but I know the importance of volumetric efficiency an have seen first hand what quality parts can do to an n/a motor when I built up my VQ30 back in the day. Dyno just verifies that you didnt waste a bunch of money for nothing, and allows you to fine tune to get the most out of your $. I'm a fan of that hehe

 

Glad this thread helps.

 

were there tests with just the Ucon?

 

I am not sure if anyone did a dyno with just the UCON (w/ T-stat & cam gears). There might be, and Gadget himself would be the one to ask about that. As he has his own dyno. Most people start out with smaller mods before jumping into the more expensive/technical tuning devices.

 

I would so like to UCON my most stock truck, but without a harness for 09+, I just don't feel the payout to tap that many ECU wires.

 

You comment got me thinking......I wonder how many wires actually need to be spliced with the UCON? The Map-ECU3 only uses about 15....

But then, I don't know if some things would need to be plugged in to the open slots or not? If they didn't, it could save time. If they did, then it would be a whole lot of wiring.

 

If there were a documented and supported method, I might be willing to try, but for reference, took much psychological effort to get the Maf Cali and URD CAI installed.....

 

These are my latest 2.7 dyno runs from the muffler shootout...

RED: Stock
BLUE: Magnaflow
GREEN: Flowmaster



One suprizing piece of new information is that a multi-chambered Flowmaster Series 50 Delta flow muffler outflowed a straight through 2.5" core Magnaflow muffler.








This puts to rest the myth that straight through is always better than chambered.

Flowmaster has incorporated some really clever precisely positioned accoustic tuning and anti reversion features that enhance the exhaust scavenging enough to outperform a straight through perforated core. This is totally counter-intuitive that exhaust gases taking complex indirect routes through chambers and around baffles could actually flow faster than freely flowing directly through a simple open tube.

And I found out something else. The Flowmaster Series 50 Delta Flow also lowered the torque peak by 100 rpms. While this is not much, it was done just with a muffler, and assumes more significance in combination with the other bolt on mods which have lowered the torque peak by 1,000 rpms from the stock 3,800 rpms down to just 2,800 rpms. This is a 27% improvement.

We've also been refining the dyno technique to get really good low end runs that begin recording as low as under 1,000 rpms by gently rolling on the throttle at idle in fourth gear instead of abruptively stabbing it at 1,500 rpms. My interest is only in low end torque so it doesn't matter that the speed limiter cuts off the tops of the runs.


Greg

 

Next mod: some for of ecu to fix the lean AFR issue.

 

What product will do that? And if it does, will it yield more low end torque?

Greg

 

Any tuning device. Simplest being the MAF-Cal.

 

Have you rejetted, or checked the accelerator pump?

 

ZOMG! How'd I forget?!

 

JK, but there have to be times when you just wish you were carb'd...

 

How easy the tuning would be.......yes, at times I have....

 

Unfortunately, my engine remains in closed loop mode under 4,500 rpms regardless of engine load or throttle opening.

Greg

 

You should speak with Gadget then. I know that the MAF-Cal can do some closed loop tuning. If it is possible, it would be good to get it down to the 12's at 100% load

 

I have, and he's been very helpful.


Greg

 

Thread revival:
Anyone have a ballpark HP increase of this mod list? +15 maybe?
MAF calibrator
URD Y pipe
AFE CAI

I have decided I am not going FI but still want to play around with the truck.
any other recommendations for hp gains?
Ive been looking for a 70mm TB forever. cant find one under $500
I sorta ruled out headers. seems like LT tend to benefit FI only.
I will probably add an AFR gauge for good measure.