[Catalyst_delhi]

Originally Posted by Sankar

Attachment 975734

Looks like the intake is just above the Hot Head , I think it will make the fueling leaner and pickup would be less on longer drives.

[Sankar]

Originally Posted by Catalyst_delhi

Looks like the intake is just above the Hot Head , I think it will make the fueling leaner and pickup would be less on longer drives.

IAT is pretty much the same. No difference. Didnt expect it to change either since there is a slot for the air to get in. Took a long drive today.

[Sankar]

This is how the inside of the airbox looks like.

[Sankar]

I have been driving the car with the resonator on and without the resonator for the last 1000-1500Kms to see how it performs.

What i have found is that the car is more fun-to-drive without the resonator with only the rubber thingy stuck on the stubby air-box. Like its pictured here http://www.team-bhp.com/forum/attach...s-dsc_0095.jpg With the resonator the car is peppier at the very low end, but is a little lethargic (compared to without resonator) at the mid range and picking up RPMs is slightly sluggish again compared to without.

Without the resonator off idle response is hesitant, but this hesitation is only off idle and i don't usually face this unless i try to start off from standstill at lower than 1000rpm which is non issue for me. Once on the move it is more fun, mid-range is better and the 2nd and 3rd gear pulls feel faster compared to stock. While slowing down it seems that i can slow down more in each gear without downshifting and if required the car can accelerate gradually without any hiccups from that gear. With resonator the car wouldn't go as low as without in each gear before it starts to clunk.

So the previous week i went back to resonator to see how it is and to see if i would like it, but honestly i found it more fun and nice to drive without the resonator so i removed it once again.

Without the resonator the car is slightly more noisier but not as much as with an enclosed cone filter. Its louder but only noticeable if someone knows how it sounds with the resonator.

Hereby i conclude this thread with my buttdyno and feeldyno findings.

I have planned to take this car to Coimbatore and it has been long pending due to various personal commitments. When i go there i will try to get a dyno run with and without the resonator to see how it plots on the chart. That will be the real conclusion.

[Sankar]

Update: Have found a way to make the OE crapbox perform better. Results were positive with better low to mid torque. The IAT were consistently lower than with OE setup.

1) Cut out all the internal ribs, these ribs protrude out by 2-3mm.
2) Get a cold air feed from outside the engine bay to the box




I was using this setup when i converted back to stock exhaust manifold, in between. Now back on OTA and headers. Headers and crapbox isn't a good combo in my Unichipped car, its stifling after 5k rpm.

[jkdas]

The internal ribs was there for some job right? To hold OE filter?

[Sankar]

For sound suppression for better NVH. Same thing is there in the i10 1.2 box. Filter is not held by these ribs.

[Sankar]

In GTO's review of the new Swift he has isaid that the new Swift 1.2 doesn't feel as sprightly as the old shape 1.2 did. The midrange and low end performance is not as good as the old 1.2, those who have driven the old 1.2 and the new 1.2 will know what i mean. The K12B in the Swift and the Ritz is more exciting in midrange performance compared to the new Swift eventhough the latter makes couple 2 BHP more than the old ones.

But NVH levels of the new Swift is a lot improved over the old ones, even when comparing the engine noise inside the cabin the old one feels a bit gruff where as the new model feels a lot more refined. The intake noise is well controlled in the new Swift. Suzuki engineers have tuned the airbox of the new Swift for better NVH rather than better performance. There are lot of baffles inside the airbox of the new Swift alongwith a resonator on the intake pipe. All this does is make the engine feel more refined but rob it off performance.



I smoothed the inside of the stock airbox using a dremel and sealed the hole of the resonator on the intake pipe with super sticky 3M aluminium tape. These two little things brought about a great change in how the engine breathes!

I will give an example when i put the header on the car it wouldn't work with stock airbox even with a K&N panel filter, the car wouldn't rev past 5000 to 5500 RPM and felt as if it were struggling for air. I was only able to use the BMC OTA induction kit with the headers. But with the smoothed and resonator bypassed OEM airbox the car revs cleanly to its redline and with a nice punch in the midrange <-- this even with the stock paper filter! Even with the stock exhaust system the modified airbox performed much better when compared to stock!

The modified stock airbox was performing so good that i sold off my expensive BMC OTA induction kit.

Some pics of the smoothed airbox.




Right now i'm experimenting with another airbox which i believe should perform even better, its from the old 1.2 Swift/Ritz. I'm waiting for one more part to arrive before i install it in my car. The old 1.2's airbox needs only minimal dremeling before its ready. But just from the looks, it looks promising and a worthwhile mod.

Differences between old 1.2 and new Swift 1.2 airbox

The ribbed one is of the new Swift and the larger smooth one is from the old Swift/Ritz.


The exit hole of the new Swift's airbox has just 52mm ID, where as the old model's is 58mm ID!


PS: The silver part is an aluminium tape i used to seal off a sensor mount which is applicable only for old 1.2. The tape is super sticky it will not peel off. The other side is filled with epoxy adhesive.

The old airbox exit pipe has a larger trumpet compared to the new Swift's.



The old airbox has much higher volume behind the filter compared to the new.


Once this box is in i will update about the difference in performance. My feeling about this is good.

[Mr_Bean]

Originally Posted by Sankar

Once this box is in i will update about the difference in performance. My feeling about this is good.

Do update the results

What is your opinion about the astar box? Appreciate if you could throw some light on the air filter.

Rgds,
Vinod

[Sankar]

Originally Posted by Mr_Bean

Do update the results

What is your opinion about the astar box? Appreciate if you could throw some light on the air filter.

Rgds,
Vinod

If its the type 1 airbox then its good, that one takes the same size filter as the Old Swift/Ritz K12.

Pic of type 1 Astar airbox.
http://www.team-bhp.com/forum/attach...1007261837.jpg
http://www.team-bhp.com/forum/attach...1007261828.jpg

[Mr_Bean]

Originally Posted by Sankar

If its the type 1 airbox then its good, that one takes the same size filter as the Old Swift/Ritz K12.

Pic of type 1 Astar airbox.
http://www.team-bhp.com/forum/attach...1007261837.jpg
http://www.team-bhp.com/forum/attach...1007261828.jpg

Hi Sankar,

Mine is the last version brought in 2013, I will post pictures of the air box tomorrow.

I somehow feel the engine doesn't breath well at slow speeds, resulting in jerks and lack of power.

The model is an automatic vxi, throttle response at slow speeds with AC on is pathetic (i.e.) takes 2 seconds to get a move on when signal turns green.

Rgds,
Vinod

[Sankar]

Originally Posted by Mr_Bean

Hi Sankar,

Mine is the last version brought in 2013, I will post pictures of the air box tomorrow.

I somehow feel the engine doesn't breath well at slow speeds, resulting in jerks and lack of power.

The model is an automatic vxi, throttle response at slow speeds with AC on is pathetic (i.e.) takes 2 seconds to get a move on when signal turns green.

Rgds,
Vinod

Last version means you had the type 2 airbox. Type 1 airbox came only till mid 2010 afaik. Type 2 airbox has a smaller filter compared to type 1 and the exit pipe ID that connects to the manifold is smaller by a few mm (i don't remember the exact figures). With a better flowing filter the jerks that you mention will be minimised.

Since we don't have flow numbers of OEM filter i'm comparing the flow numbers for two K&N filters.

33-2968 - This will fit Swift/Ritz/Ertiga & Astar(with Typ1 airbox)
33-2986 - This is for Astar Typ2 airbox/ AltoK10/ EstiloK10B/ NewWagonR

K&N airflow test
33-2968 - 248.3 cfm @1.5 inH20
33-2986 - 166.3 cfm @1.5 inH20
Demonstrated amount of airflow before the air filter creates restriction of more than 1.5 inches of water pressure

I would suggest replacing the Typ2 airbox with Typ1 airbox, but only after making sure the plastic panel behind the bumper grill has an opening (or making one) to feed air to the airbox while car is moving. When Maruti reverted to Typ2 airbox there is chance that they might have blanked out the hole which was present in Typ1 equipped cars. If its possible that might enhance the throttle response and minimise the low speed jerks.


Source:
33-2968.pdf
33-2986.pdf