Great "Un-mod"

My G1 was hesitating at lower rpm and kept throwing a too rich CEL.
I cleared it a few times but each time after a few days it returned.

Could be a lot of things like failing MAF or 02 sensor, but before replacing either or both I replugged the 5" hole I put in my airbox- and viola, problem gone. Accelerates noticeably better and no CEL after a couple of weeks.

I think it threw off the AFR and the ECU could not compensate, or, overcompensated. The Bosch ECU on my racecar (Porsche) has the ability to learn and adapt to a certain extent but any major changes require a remap. I think the Toyota would need the same.

Maybe (maybe) there is more peak hp from this airbox mod but I think for everyday driving its of questionable value. As always YMMV.

 

In a word- yes.

On older (pre-1999) air-cooled Porsches drilling holes in the airbox is a popular modification- as much for the sound (more) than any possible power gains or improved mileage. The Bosch DME (ECU) has an innate learning capability and seemed to handle these types of changes with little if any issue- not so sure about the ability of the one in the Toyota to do the same.

 

deckplate mod does not work on the 2nd gens. Here is proof lol.

 

Yes- Gen 1.
It may work great on other trucks (Gen 1) but didn't on mine.

 

Chris4x4 had some dyno runs with ~6-8 peak hp gains. I dont think you will see much difference in the low to mid power range. Unless you drive your truck upwards of 5000 RPMs, not much gain will be noticed.

 

x2!!

 

yeah i always leave my cap in the deck plate

 

didn't see that

Ive had zero problems with the deckplate in mine. Just better sound and more power when reving it out.

 

I think most people have used a 4-inch plate, but you used a 5-inch. That is quite a bit more air coming in. Not sure what size the dyno results were from, but I assume 4-in. Maybe this is a factor in your case.

 

Maybe. I found a 5" diameter foam element that I stuck in the cutout to prevent any dirt from finding it's way in. It's wall size is 0.5" so effectively it's about 4". Regardless, with it or without the performance seems to be the same.

My point is ( I think) that if there is a gain in peak hp, it may be at the expense of low or mid range power. For the Gen 1 here in Nassau it's all low/mid range so not a good trade off for me.