echoman

Thought I'd post my results over here too for reference, since I see some people swapping in a few truck engines in their rides.

'06 4.8 Silverado with some heavy 20" wheels. Running a 3:90 gear and trutrac, 60e with 3k stall. KB racing turbo kit with the BW s369 turbo. Custom spec'd turbo can from LJMS. Trunnion upgrade, and cam springs. 80# injectors, Walbro 450 fuel pump.
Have the 9# spring in only seeing about 7#'s with the cam. Made 460rwhp and 442rwtq VERY conservatively.



https://youtu.be/2AmIkTA48AA

kingtal0n

iTrader: (1)

Isn't that turbo capable of 700 or 800 horsepower? Any particular reason you chose such a huge, oversized turbo for a mere 500 to the wheel? Spools pretty dang slow with all that extra weight. you must be planning to go much bigger?

echoman

It's a 69mm turbo, so not very big. Plan on pushing 600 to 650 eventually once I get a trans that can handle it.

RealQuick

iTrader: (14)

Congrats! Must feel great when the boost hits.

kingtal0n

iTrader: (1)

Isn't this the same engine they used in this test?
http://www.superchevy.com/how-to/eng...-mouse-part-3/


I just feel like, you are leaving over 250ft lbs of torque on the table at 3k rpm because of the enormous turbocharger.



I'm wondering if maybe you have a leak? Or the exhaust system is really really huge which is killing low flow cylinder VE. Why was there no A/F curve on the dyno? And why is smoothing set to 5? These are signs somebody doesnt want other people to see whats really going on.

echoman

It's the same type of engine. The turbo is not enormous, it's a 69mm, so it's actually relatively small. Only running a 3" down pipe into 3" tubing into a straight through style muffler. The results are pretty typical for this type of setup at the said boost (7psi), timing at 15*, and the afr is 11.4.

Project GatTagO

iTrader: (7)

An engine dyno will load the engine much better than a chassis dyno. This turbo should light off almost instantly.

Andrew

DavidBoren

The turbo is perfect for a 4.8L, and I am sure there is plenty more in this combination. Sounds like an excellent start. Power will only go up as you get a little more aggressive in the tune, if you desire to do so. Good job.