I'm afraid I don't have the original clamp as this TB was from Webb Motorsports (already modified).

 

I am wondering if the UNI filters will work with this mod.

I don't like the K&N filters. Yeah they flow a lot of air but I don't think they have the filtering capabilties necessary.

Here is the uni universal applications.

http://www.unifilter.com/clamp-on.htm

They don't say how wide the filter body is though.

I was thinking the single layer would be the narrowest but they don't offer an angled flange with the single layer.

 

I have a few boxes of UNIs that I experimented with when I "designed" this intake. Some of the smaller ones fit but they're very small and didnt flow as well.





--
Cheese

 

Hey Cheese,

Do you have a similar plot adding in a typical CAI ??

BB

 

BB,
Andy has a similar plot on page 2 of this thread comparing the K&N to the Alta. His numbers are different becuase my analysis was done on a stock car.

--
Cheese

 

Andy,
Wow, just installed the ru1550. What a sound. Thank you for all injunity, time and data you have collected. I cant say my butt can feel a power differance. But my ear sure can. What a great mod.
I only have 2000 miles on the car, should I reinstall the original unit for my regular service at Mini? Thanks again. Brilliant Idea...

 

it depends on your dealer. I have heard that some won't care, and some will hassle you. I put my stock box back in (I too am running the HAI) before servicing since it only took about 10min. I would just ask the dealer what their policy on intakes is... if they tell you no problem then don't worry about it.

 

There is only a half a pound of boost difference between the two filters and the foam flows better at the low end. If you could find a taller foam filter, I think the Unis are 6 inches tall max, then I think the foam and K&N would be almost equal.

 

I installed the K&N 1550 and did some 2nd gear 2500-7000 RPM pulls. These are the exact data output from the OBDII via my Auterra reader:


I have no freakin' idea what this low-rpm low-boost thing is on the HAI. Peak figures, accounting for ambient, are actually less on the HAI. IAT's are similar. Yes my MAP data varies from Andy Ross's - I can't account for that.

Seat of the pants - the HAI is much quieter. Also, throttle tip-in is much more "dead" with the HAI. I can only guess this is because the less air volume in front of the throttle body. One positive, throttle response is smoothed out - though it seems at the expense of low-RPM power.

I'll keep it on for a little longer, but I'm less than impressed with the outright performance. I must admit I was hoping for something more after reading all the hype.

Regards,
Ryan

 

What is the x-axis scale? At low rpm, it almost looks like the bypass valve was sticking open.

 

X-axis is "samples", as noted in the graph header. It can be loosely correlated to RPM, as it's based on time.

Why would by the bypass valve stick open with only the HAI, consistently at that? The BPV operates smoothly anyway...I've inspected it in-action (revving while parked)

 

I was discussing this with cheese. Which of your "fixes" do you have installed? Can you email me your raw data?

 

There is less vacuum being generated by the HAI because there are less pumping losses. Maybe not enough vacuum to close Ryphix #2 ? I'd guess thats why your tipin is lacking as well.

--
Cheese

 

I thought the hype was you could get around the same/similar/slightly better performance as the best CAI for 50 dollars vice 200+.

 

'cheese - the Ryephix2 uses a return spring that's twice as stiff as stock - returning to close is its' forte' If lack of vaccum was an issue - then it would be more noticable on a stock BPV.

 

Would you mind sending me your raw data? I will do the same test on my own car during lunch. BTW, I tried your zip tie method and got some similarly weird results:

 

I've always been baffled by that graph Andy - as I've chassis dyno'd stock BPV and zip-tied and saw no difference in HP and torque.

Sure I can send you my CSV files.

 

Thanks for sending the data. What is other intake that you are comparing to the HAI?

 

I think I figured out what's going on with your data. Your baseline logs sampled at a different rate than your HAI logs. Without a timestamp or RPM reading, I can't tell for sure, but by changing the scale, I can get the HAI and baseline pressure readings to overlap almost exactly. It looks like you have more data points with the HAI logs than you do with the baseline (presuming you stepped on the throttle at exactly 2500 and let off at exactly 7000).

 

Bingo! Here's your data with the x-axis scales matched:

 

It looks like your Unichip is corrupting the signal from the MAP sensor, hence the ECU (and your scanner) do not get an accurate picture of the boost. Do you have a boost gauge?

 

sheesh, Andy. you showed the numbers.

now can you tell me why my stinking radiator fan won't turn off, high and low are blastin' whenever the endgine is running??@#?&$# :smile:

 

John, weren't you having trouble with the fans from day 1 (prior to installing your manual switch?)

Here's a run I did during lunch, 2nd gear from 2.5k to redline:



As you can see, there is none of that weird low-rpm boost loss that Ryphile reported.

 

Part 1: RPM vs. MAP, ALTA CAI vs. K&N 1550 "HAI", WOT, 2nd gear, ambient temp: 41F



In raw numbers - the ALTA CAI had a peak MAP reading of 0.6 inHg (or 0.29PSI) higher than the "HAI". The ALTA also has slightly higher MAP across the board. As you can see, this is in RPM, so there's no chance of funky data sample rates.

Coming soon - Part 2; Dyno, HP and Lb-Ft.

 

Part 2: wheel HP & wheel Lb-Ft; ALTA CAI vs. K&N 1550 "HAI", 2nd gear, WOT, SAE J1349 corrected



As you can see - the ALTA CAI has a power and torque gain over the HAI through most of the band. This explains why my car didn't feel as quick with the HAI. It also shows that MAP isn't the whole story with making power. Perhaps acoustics play factor, and perhaps the velocity stack effect the UNI filter has going into the silicone tube. Perhaps it's just my car, but these are the figures.

I applaud macncheese for coming up with the HAI idea - it's a brilliant one. I encourage everyone to take innovative approaches to getting more performance out of the MINI. For my MINI, the HAI didn't work that well. I wish it had, but hope doesn't fuel dyno figures.

Cheers,
Ryan