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 Originally Posted by EuroAccord13
No drop in low end? Are you talking about the Typhoon system? 
CAI will almost definitely cause a slight drop in the low end.. I have seen it for myself in multiple tests performed with my car on SRI and CAI mode, I even took it to the strip and my 60ft time confirmed that I lost abit of power on my lower end of the RPM band... 
When i did the back to back dyno CAI vs Stock, I gained power from 3000rpm to cutout.
If you have a look at the above graph, it is of a system which is very similar to the k&n typhoon system. While it's not of the exact same dimensions as the typhoon system, it indicates that you lose almost no low end with a cai (on WOT).
Last edited by ginganggooly; 23-03-2007 at 11:10 AM.
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that's all we know
CAI always drop in low end and it quite noticable
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i say box~!! comptech or mugen! looks stock, good gain over a range of rpm, hear vtec. ALL GOOD!! quiet when not full throttling.
'03 Integra DC5 Type R
Wakefield Park: 1:13.047 w/ street tyres
Eastern Creek Int'l Raceway: 1:57.969 w/ street tyres
Power: 155Kw with Mugen N1 ECU
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Originally Posted by ginganggooly
If you have a look at the above graph, it is of a system which is very similar to the k&n typhoon system. While it's not of the exact same dimensions as the typhoon system, it indicates that you lose almost no low end with a cai (on WOT).
Your chart shows the base line ahead of the CAI down low. It also doesn't show you the differences in torque. So there is a loss down low with a CAI.
It is the main reason I prefer the boxed intakes like Icebox for street driving - unless you are prepared to spend money on ECU tuning out the losses down low.
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Originally Posted by yfin
Your chart shows the base line ahead of the CAI down low. It also doesn't show you the differences in torque. So there is a loss down low with a CAI.
It is the main reason I prefer the boxed intakes like Icebox for street driving - unless you are prepared to spend money on ECU tuning out the losses down low.
No, it shows the baseline BELOW the CAI down low.
The CAI yielded small gains until ~2700rpm on the displayed graph. There is a ~400rpm area with slightly less power (difference of less than 2.5kw), at about 3000rpm they cross over and the CAI has a clear advantage from there on.
You don't need a tractive effort line to see that the car is making more torque everywhere except for that 400rpm space.
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Enclosed short ram ftw!
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Stocky CL9 - 1:17.2
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but that 400rpm less than stock is a lot when u going up hill with a heavy car like Euro. I got stock air box, injen and mugen airbox. There is a HUGE different in low end as on the street, u usually rev up to 3000rpm unless u drive like a race car all the time. Actually CAI only work when the pod start to WOT.
Originally Posted by ginganggooly
No, it shows the baseline BELOW the CAI down low.
The CAI yielded small gains until ~2700rpm on the displayed graph. There is a ~400rpm area with slightly less power (difference of less than 2.5kw), at about 3000rpm they cross over and the CAI has a clear advantage from there on.
You don't need a tractive effort line to see that the car is making more torque everywhere except for that 400rpm space.
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Originally Posted by aaronng
Enclosed short ram ftw!
The enclosed short ram setups had interesting results in my car... I spent a whole day at the dyno (with the DC2) testing out various intakes.
I changed from the modified stock airbox to a shortram with no shielding and lost 6kw peak, and a bundle down low- not sure how much it was, but the whole graph was moved down.
I thought it may have been heat soak, so I bolted in the partition I made for short ram and tried it out again. Still had the same result. Thinking that maybe the heat shield wasn't working properly, we lifted the bonnet and ran the car up like that... same result yet again.
After trying out various configurations with pipe diameters and lengths, we worked out that the issue of powerloss (on the dyno) wasn't heat-soak, but due to having incorrect pipe lengths. It seems to hold true, as the modified stock airbox made almost as much top end as the optimumly sized cold air intake. As it turned out, the total pipe length of the stock intake arm, stock airbox with pvc pipe extension had an almost identical diameter and total length to the best tested CAI...
We did some rough testing on a few different motors (b16, b20, 4age, sr20de) and they all had similar results.
The lesson learnt from the whole exercise was how important pipe length is to overall breathing efficiency of the motor.
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heat never be a problem on dyno i guess as u should have open up your bonnet plus you wont have a lot of runs before you sway to another setup
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Originally Posted by TypeG
but that 400rpm less than stock is a lot when u going up hill with a heavy car like Euro. I got stock air box, injen and mugen airbox. There is a HUGE different in low end as on the street, u usually rev up to 3000rpm unless u drive like a race car all the time. Actually CAI only work when the pod start to WOT.
You're splitting hairs.
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Stocky CL9 - 1:17.2
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Originally Posted by TypeG
heat never be a problem on dyno i guess as u should have open up your bonnet plus you wont have a lot of runs before you sway to another setup
Why should we have the bonnet up?
We had enough consistancy in our results, from run to run, to convince myself and the tuner that the results were reasonably accurate.
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Originally Posted by aaronng
You're splitting hairs.
what does that mean?
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