just how much boost is suggested???

**Jimbo74** · 05-07-2009, 04:21 PM

ok im lookin into buyin a 05 silverado 5.3L 4x4. and ive seen the STS Turbo kits, just how much boost would yall suggest me run for a daily driver, i dont wanna go crazy with it just enough for some fun every now and then

**ct9a** · 05-07-2009, 09:25 PM

Personally, on a stock motor, I'd be hesitant to go into double digits. 5-7 psi sounds reasonable to me.

**phoebeisis** · 05-08-2009, 11:04 AM

Exactly- 5 psi-roughly a 30% increase in HP/torque is about it.The knock sensor usually limits power when you used more-retards ignition

Charlie

**Fender Bender Intl** · 05-08-2009, 12:42 PM

8-12 psi id try and run 16 personally it just depends on how much of a lead foot you have

**tbplus10** · 05-08-2009, 07:52 PM

5-7lbs if you have no ignition or fuel system mods, I've seen as high as 18lbs with a stock engine but I dont think I'd recommend trying that if you want any longevity out of the engine.

On my 7.4ltr Suburban I run 8lbs with the ignition tweaked (a custom made chip) and larger injectors.

My Tacoma runs 16lbs with Supera Performance injectors, a 7th injector kit, upgraded ECM, hotter coils, blue printed heads with stainless valves, and copper head gaskets. I also run a water/methanol injector in the air intake.

**phoebeisis** · 05-09-2009, 10:05 AM

Big aside, but TRD- Toyota's kinda aftermarket performance group- had a "bolt on" kit for the 4.7 liter in the Tundras. It was eagerly awaited by Tundra owners.

It made claims of maybe up to 7-8 psi boost and 40% increase in hp.

The 1st guys who bought them had loads of problems. Finally after all the problems were sorted out the owners found that they would rarely get above 6 psi boost because I guess the knock sensors would "tell" the TRD control unit that it was knocking/pinging and open the pop off valve(or what ever limited boost).

Like tbplus10 said, you need lots of extra stuff to go up a lot on boost.The basic kit that is usually sold just doesn't have all the extras that allow you to go with the big boost with 92 octane.
The extras are injectors maybe a pump etc that allow you to hose in lots of fuel to keep the temps down-or water or water methanol/ethanol to keep temp down.

Like they say, not much point in going more than 5-7 with a stock setup-gasoline won't allow you to use any extra claimed boost-and if it did you might break the motor.

You know nitrous oxide is a lot cheaper/simpler than a turbo charger-and you get stock mpg when not on boost. Turbos obstruct the exhaust all the time, and your normal mpg usually drops a tiny bit.Easier to remove when you decide to sell it/trade it

Charlie

Charlie