Final word on intakes

[AdamR28]

Not sure mate, this is my OEM airbox.

Would have thought Corolla, Celica?

[SurreyMR2]

Not sure mate, this is my OEM airbox.

Would have thought Corolla, Celica?

Sorry, I misunderstood, thought you used a 2ZZ intake housing.

Makes sense as looking at the picture I thought that airbox looked familiar 

[AdamR28]

And perhaps I wasn't clear enough- thanks for asking to add clarity to the thread.

For completeness- I also have the MAF mod in place (vanes removed from airbox / tube, MAF riser spacer and yellow injectors).

[AdamR28]

Well. The car "feels" faster.

And the data shows it is too.

This is the same test protocol I carried out around 300 times when I was learning the MX5 ND's ECU. After that map was finalised, I took it to the dyno and no matter what we tried, couldn't get it to make any more power or torque than the map I'd gone there with - which had been developed on this stretch of road.

Cruise at 2000rpm in 3rd until a very specific point, then floor the throttle until the limiter. Simple test. Road is flat to within 3m, and flanked by trees either side, though I do ensure wind speeds are low. So, I'm confident the data is good.

Raw data... 4 runs taken, the most outlying each time discarded.



Graphically displayed...



Things to note: the MAF mod with OEM intake was on a wet road ("worth" about 3bhp of extra drag) but with higher atmospheric pressure than the other two. These effects will cancel out nicely, though.

Today's test was with a marginally heavier car, more fuel and various bits of junk.

The car really "pulls away" (vs OEM) in the top end of the rev range now. This is noticeable when driving.

Sounds so good over 5.5k too! The induction noise is awesome with the roof up.



Random snippet, this is test data from my MX5 after remapping. The 30-90mph time is almost identical to tonight. The OEM map on this car was approx 0.5s slower, which turned to be 8-10bhp on the dyno. And with these two cars having  virtually the same gearing, weight and power, I'd say that this new intake setup with the MAF mod is probably about that figure over standard. Which ties in perfectly with Danny DC2s testing.



So, for me and how I use the car, I would say there is a benefit to swapping out the OEM intake system.

I'll lob a wideband in the exhaust sometime to check what AFRs are doing, and maybe print a couple of different height MAF spacers to tinker some more.

[simonrobinson]

My old 1zz performed well with pretty much this exact setup... yellow injectors + factory maf housing + random cone filter. Have you got a wideband kit? Logging that is really what you need.
I now run my 1zz on an 2zz apexi PFC ecu as they are dirt cheap and plug'n'play.

[AdamR28]

Ooo, I did wonder about a piggyback to play around with. I shall have a nosey. Thank you.

On the wideband subject, I think I have one somewhere, just need to dig it out. Though IME wherever the car makes most power is where its happiest. Whether that's 12:1 or 13.5:1, it doesn't matter too much.

[Gaz mr-s]

Well, it was pretty easy to get out. Mr Angle Grinder made short work.






Connected up with part of the OEM pipework, and a cheapo cone filter. Sounds tons better, no driveability issues that I have detected so far, better throttle response with much reduced volume of air to get moving, but very likely to be offering less filtration than the OEM setup. No perfect solution   

I have some data from the OEM setup that I will test this against in the coming days...

I'm amused at what you show is the remnants, not the maf tube you 'released'.   

It was my intention to try the maf mod & 2zz injectors in conjunction with the intake I made,  but I also have a 1MZ V6, & I'm not sure I'll be keeping both cars, so my 1zz work may be done.

[AdamR28]

I'm amused at what you show is the remnants, not the maf tube you 'released'.   

Ha! Yeah it totally slipped my mind to take any photos during the process. It's not particularly pretty, though could be made neater, just glad its hidden away behind the battery 

[Gaz mr-s]

Ha! Yeah it totally slipped my mind to take any photos during the process. It's not particularly pretty, though could be made neater, just glad its hidden away behind the battery 

Lol, I had to use some repair glue on mine after the grinding.   

[shnazzle]

From a "pulls away" perspective; I remember my car being noticeably faster than others on drives out once it got up to chat.
But, that was also with the zero exhaust manifold and custom 200cell sports cat.

But... the missus had a bone stock MR2 of similar age (now owned by other forum member) and it 100% had better torque from standstill. You can totally see why Toyota designed the intake as they did. As they documented; the engine and the intake were purposely designed to deliver higher torque lower down.

The way I drove (usually living between 3500-5500 rpm) the "open" setup was 100% better. It was absolutely mean. So much so that the only 2zz builds that were of interest to me were the ones with stg1 or 2 cams and/or turbos.
My car went on to live a life on track for a few years longer, and the new owner also commented on its "liveliness" on track but with  stock intake!

In summary; as you say it depends on how you drive. But the "open" intake definitely benefits the screamers among us