Stock post MAF accordian tube question???

ddvette9

Cobb post MAF silicone hoses advertise a benefit over our "restrictive" and
"corrugated" stock plastic hoses post MAF. The cobbs are expensive at over 100$ with no filters. Has anyone checked into really examining our stock accordian style tubes to see how restrctive they are (as far as flow and heat). Ive seen a few people on here with the Cobb's. I have a feeling it will be a nice mod coupled with K&N's but not really sure if the benefit over our stcok tubes warrants the 100 price tag and better performance in general.

please dont hijack this thread with Stillen gen 3 or injen talk. Thanks. Lets keep this discussion pertaining to this somewhat stock mod

http://www.cobbtuning.com/products/?id=4968

Kastley85891

Smoother path is obviously better but really what actual gain? who knows, I ran COBB post MAF's with stock air boxes and HKS drop ins and it was more responsive, personally I liked the solid silicon COBB tube to the flexy tube we have as stock.
I do think the stock intakes lack in terms of design, although granted function well.

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m4a1mustang

So far no one has tested these to measure gains. IMO, the COBB tubes, K&N Drop-Ins, and Modshack-style ducting would probably be pretty close to the performance of the Injens/G3s.

The stock air box is very nice... there are just a few areas that could use improvement (i.e. COBB tubes, K&N filters).

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m4a1mustang

This could be your chance to test these for us... dyno!

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Kastley85891

^ agreed,
My stock air boxes with drop ins and PMAFS ran great, I did the mod below also.

I did not really want to drop 500 bucks on intakes but do like the G3's, they do seem to perform, I ran this set up for less then 200 bucks, COBB post MAF, stock MAF tubes, some silicon elbows, and a couple AEM dry flow filters, I tuned the fuel via a COBB AP and WBo2, it made for a great little responsive Z with a set of test pipes.

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m4a1mustang

That setup would be a lot better with filter shrouds like Modshack's. You need to isolate the filters from the heat of the engine bay and draw in "cold" air from the outside... I bet you'd notice a difference as those guys will get heatsoaked within a few minutes of driving.

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Kastley85891

Actually they are pretty good, I understand the heat soak thoery TBH it is over rated ;-)
I have ran Short rams on cars with a lot more power then my Z and tuned a lot of vehicles with both SR ,CAI and no filters! and TBH intake temps are pretty resonable, every one gets heat soak sitting still etc

I kept the ram scoop form the original air boxes in place to feed the dry airs, next up I am flex piping some 3in tube around to the front G3 style.

I diverse, back on topic, I think they are a decent mod for 100 bucks

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ddvette9

good responses so far. but i was looking to see any chemistry/biology majors out there that can comment on the heat handling of silicone hoses vs the plastic hoses and maybe if there is any actual physics involved in air traveling through the corrugated stock tubes vs the smooth silicone .

Zsteve

have you used the cobb to measure the MAF intake temps now with the short ram intake? Im only 8-10 above ambient with the stock boxes and K&N drop ins. Im sure yours will be a good bit higher now that the filters are exposed. IMO I would have spent money on Modshacks filter covers before the Cobb hoses.

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efuseakay

You can always fab some heat shields too...

280z/300zx

What you need is a physics major to talk about flow through both style of tubes.

As a biomajor I can tell you that you really don't learn anything regarding heat vs. types of materials; at least not in depth material. Thats more of a chemistry deal.

I too am interested in this topic as it's been a mod I've been thinking of doing. No dynos around me to do a before an after so can't go that route.

TBSS2008

I have been running the Takeda SRI for a while now. I figured I was pulling in a lot of hot air due to the fact the filter is under the hood. After getting the Cobb AP and monitoring intake temp I found this is true sitting in traffic it gets real hot 150F (not good) this is when outside temp was 71F. Well what I was not expecting was how quick the intake would cool off after being completely heat soaked in traffic. In other words after sitting at a stop light Intake temps at 150F outside temp 71F, I punch it to 80mph by the time I let off my intake temp is down to 85F, if I stay in the throttle it will get even cooler. Now if I am cruising the highway at 60mph intake temp is usually 15-17F over ambient temp. If I punch it and stay in the throttle to 90mph after cruising at 60mph my intake temp is 7-10F over ambient. So the best intake temp over ambient is 7F and the worse I have seen in major traffic was like 79F over ambient (Freakin Hot).

On a side note car just screams now with the Cobb AP AAM Tune I got yesterday, all grins over here!

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m4a1mustang

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Modshack

I honestly don't think you're going to "notice" a difference. There has to be small improvements in flow though as smooth wall tube will obviously flow better than a corrugated one that would tend to disrupt smooth flow. Generally, a series of small improvements often add up to measurable gains, but just this one will not be a $100 kick in the pants. I've done both the Cobb and Generic 45 degree 2.75 elbows, but they've been in concert with my custom CAI mods...I didn't notice any change when I went from the stock hoses to the smooth walled silicone (both with my filters installed)

Generic hoses with custom PCV line take-offs on my car (before the Cobb's were available):


My friend Zpirate's car with the Cobb hoses:

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Kastley85891

Yes I did and it was acceptable, each his own on mod path I guess, its all trial and error and TBH its what I like to do, Wifes gets a little teasy at the amount of time I spend changing things and tinkering.

Like modshack said you will feel nothing from this mod alone but a number of smaller changes can effect the vehicle quite nicely in some cases and like crap in others, for 100 bucks and another 100 on top, a couple hours in the garage and a sawsall I was happy with result.

Combined with the drop ins I think a viable option for some one, who is concerned about the possible HS.
If you tune the stock air boxes or pay some one to do it you can extract gains from the fueling so good chances for improvement all round

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