3S Beams Low End Torque

I have recently put together my 3S beams engine and dynoed and comparing to other dyno graphs online my engine appears to have a significant dip in low end torque below 3000. This is also apparent when driving as it feels sluggish.

The car is tuned using a maxxecu sport and the engine is a 5th gen black top beams (auto) with high compression 12.5:1 JE pistons and a 2.5in exhaust with vibrant ultra quiet resonator and street performance muffler. Car was tuned on 95ron octane gas. Currently only the intake vvti is tuned as the tuner indicated that no observable gains were made on wide open throttle with the exhaust vvti.

Is there anything that could be done to improve the low end torque or anything I should check?

It doesn't look like the dyno run started until 3000 RPM. How do you know the there is a dip below 3000 without any dyno results?

Has the ignition timing been optimized in that RPM range? You will likely need a load-bearing dyno to tune the performance in that area.

My error, I mean from 3000-4000 more specifically that dip at 3500rpm.

I am seeing Dyno graphs for other 3s beams online making roughly the same torque from 3000 untill 6000 but I have a pronounced dip at 3500rpm.

I believe that ignition was advanced as much as safely possible.

Hi.

First of all for CR 12.5:1 you need much higher octane rating fuel. For instance JDM stock engine with 11.5:1 CR makes 200+hp at the crank on premium gasoline which is RON100. By using high CR on RON95 fuel you are loosing quite a bit of power everywhere.

Secondly, I've checked a few 3s-ge Dyno sheets and they are very similar in power to yours between 3 to 4 thousand RPM so it doesn't look like you are too much off considering usage of 95RON fuel.

As far as power dip around 3500 RPM I would be looking to VVTI system and try to play with that.

Attached is Dyno sheet for stock 3s-ge beams engine just for comparing (100 RON fuel)

Thanks for the advice. I know I am leaving a lot on the table by not using higher octane fuel. 95ron is the best I have available locally at the pump and for a daily driven car I prefer the convenience of a pump gas.

Do you think it's a good idea to invest in a water meth kit?

I had 2 tuners try to improve the power using the vvti and timing but neither were able to give any real improvement.

In was just curious if I should be checking anything else eg intake or exhaust. I also believe I have a small vacuum leak so not sure if this is a contributing factor.

Well, I would definitely make compression and leak tests first. Double check on timing belt.

WMI is always a good idea for high compression engines. I've put together Honda H22A engine with 12.8:1 CR and it moves on WEI