madclown

iTrader: (4)

I have been thinking about the TBB free mod for some time and decided to do a simple test to see if it has any effect on the temp of the throttle body itself and therefore the temp of the intake air. I used my SnapOn "Bluepoint" Auto meter which has a temp probe to take a measurement of the surface temp of the throttle body at operating temp. The surface temp reading on several points of the throttle body reached 200 degrees F. before the TBB free mod. I also had my diagnostic scan tool attached to the car while driving. The Intake Air Temp "IAT" was an average of 100 degrees F. and the Coolant temp was an average 215 Degrees F. The ambiant air temp was approx 90 degrees F. The TBB free mod was performed on the car that night. The next day at the same time of day I took the car out for the same drive doing the same speeds and the same weather conditions. The throttle body surface temp reached a max temp of 167 degrees F. the weather was a carbon copy of the day before. The result of the test is that the throttle body surface temp was approx 33 degrees F. cooler after the TBB free mod was performed. This temp diff. shows a definate reduction of "heat-soak" into the intake charge. I am now a beliver in this FREE mod.....The next test I will be doing is for the FRA mod looking for an IAT reduction after the mod......

Omega Doom

iTrader: (2)

cool deal oatmeal!

Red99TA

iTrader: (11)

Good info. I don't think the debate is whether or not the TB is actually cooler but whether or not that has much effect on the air going through the TB. If you go more in-depth and look at the heat transfer coefficient of the TB along with surface area and velocity of air going through then you'll see that the air is only slightly cooled by this mod. I'm not knocking it b/c I still did it since every 1 HP is worth it to me!

Ripper415

iTrader: (6)

good writeup man. it's nice to see people take these mods in a scientific direction and show concrete proof rather than just "i did it because everyone else told me to". keep up the good work.

Fifedogg

iTrader: (15)

Nice

RevGTO

iTrader: (12)

Exactly. It doesn't really matter what the TB surface temps are, only the effect that has on IAT. But since you can't get IAT's from behind the TB, you don't really know what effect it has unless you calculate it. But if IAT's go down 4-5* on average, for example, the effect would be nil.

madclown

iTrader: (4)

A 33 degree temp diff. is quit-a-bit. Heat energy moves fast. Maybe right before I switch to the LS6 Intake I will drill and tap the LS1 Intake and install an IAT senser after the throttle body. That would give true IAT after the TB. Just a thought.

BobDoLe

iTrader: (11)

i would think that since the throttle body is attached to the rest of the intake, the IAT would be affected somewhat at the sensor. did you notice any drop in the IAT readings?

JohnnyC

We discussed this all before in great detail...

https://ls1tech.com/forums/advanced-engineering-tech/602458-heated-t-b-its-effect-intake-air-temp.html

madclown

iTrader: (4)

No diff in the IAT reading because it is obtained way before the throttle body on the intake lid. One way to lower that "in theory" would be the FRA mod. I will be doing a test on that soon....