1FZ-FE Stock VS Light Head Mods Dyno Numbers (+62 lb-ft) (2 Viewers)

Joined
Mar 12, 2018
Messages
572
Location
Doha Qatar
Hey guys,

I tested my LC100 with the gen 2 1FZ-FE on the Dyno today to get a baseline and I’ll retest it after the head mods to see the difference.

My 1FZ motor is completely stock internally, it was rebuilt around 5 months ago

Only mods currently: 4 inch cold air intake and a full exhaust, 6-2-1 tri-y header with a electronic muffler. When the muffler is closed it sounds only a bit louder than stock which means it must still have a good amount of back pressure. When open acts like a straight pipe and is very loud so very minimal back pressure.

First dyno run was with the muffler CLOSED and the second dyno run is with the muffler OPEN.

I wanted to know if back pressure made much of a difference since everyone keeps saying that and you don’t really feel it in the butt dyno, so I didn’t expect much BUT IT DID gain a good amount ! Keep in mind muffler closed vs muffler open so everything else’s in the exhaust stays the same I imagine from the stock cast iron manifolds to headers + muffler open would be a even bigger difference

Dyno run #1 (Muffler closed): 167WHP, 168.2 Pound feet of torque at the wheels

Dyno run #2 (Muffler open): 181WHP, 188.7 Pound feet of torque at the wheels

Even without mods I am pleased with those numbers on a stock motor !, no wonder why this thing is such a blast at the dunes.

Now we established the baseline with the stock motor, here are the mods that I will do to the head:

1. Supertech oversize valves 1.5mm (stock valve size: 1.2mm). https://www.realstreetperformance.c...zfe-39-5mm-1-5mm-flat-swirl-intake-valve.html
2. Supertech valve springs + retainers. https://www.realstreetperformance.c...zfe-82lb-dual-valvesprings-retainers-kit.html
3. Head CNC polish , and ported by hand

All else will be left be left stock.

this is the most popular setup or work done by locals on their 1FZ so let’s see if it is really worth it

All else will be left be left stock.
Picture of my head as it’s being worked on now:

8E580474-9D3E-4143-81AB-F80276DAC31F.jpeg


First Run Result

File_003.jpeg


Second Run Result

File_000.jpeg


RED = HP , BLUE = TORQUE

First run powerband (muffler closed)

File_002.jpeg


Second run powerband (muffler open)

File_001.jpeg


Video of the second dyno run


Head work should finish by Wednesday, I will either take it to the dyno the same day or the day after and will post the results here.
 
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Joined
Mar 12, 2018
Messages
572
Location
Doha Qatar
What is this??, completely unexpected results.

Small gain in wheel horsepower, but a massive gain in wheel torque!. I expected the opposite.

On top of that I am making peak hp and peak torque much earlier in the curve, which is really good, I thought oversize valves would flow less due less velocity at lower rpm and make less low end power, that defiantly did not happen based on the results.

Before the headwork: 181 wheel hp, 168 wheel torque

After the headwork: 190 wheel hp, 230 wheel torque (+62 lb-ft !)

PHOTO-2021-04-21-09-16-37 1.jpg


PHOTO-2021-04-21-09-16-37.jpg
 
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