got a uk 99 and i'm going to put an induction kit on was thinking between the safety of a K&N induction kit or the quality of the HKS racing suction kitwhich would be the best and does the hks work well the UK99 imprezas

 

Are you saying K&N ain't quality?

 

choose by how much you want to spend, thats it really...

 

i'm not saying K&N aint quality

just after opinions on which would be the best

[Edited by stevebt - 4/23/2003 7:22:28 PM]

 

If we're talking performance then you wouldn't be able to tell the difference.
They may sound slightly different.
The price will certainly be very different.
For your engines sake i would choose the K&N as i did.
Just as a side note, it is well debated as to wether an induction air filter is a performance enhancing mod or not, on an Impreza.
When i put mine on the initial throttle response did feel sharper, but as i've not sampled a performance panel filter, i'm not qualified to say that an induction filter is better. I would guess that the difference is negligible.

 

HKS leads to serious MAF misreads that threaten the safety of your engine from what I saw. Absolute nightmare to map around just like the APS induction kit - in fact the same calibration sorted it pretty close. Search on APS induction and you'll see the issues well documented. Aside from that I know someone who blew three MAF sensors with HKS induction, then none when he didn't use it any more. It could be fitting, but he fitted it properly. Vibration?

 

well at the minute i have a K&N panel filter but that was to keep insurance off me back now it doesnt make any difference with me insurance company was going to change to induction kit, and the maff sensor was my main worry

 

I have run a HKS Suction kit on my MY00 for two years and had no problems whatsoever. And it was definately performance enhancing.

 

How about a Blitz SUS Filter? Look and sound great, had one fitted for about a year with no probs,did blow a MAF sensor but I don't blame the filter

 

The odd person here or there reporting a failure or no failure is not statistically significant.

The only one I would fit is a 57i or an APS if you remap. On the standard turbo I think not bothering at all has much merit. If they go significantly quicker at this level because of an induction kit it is IMHO (and Prodrive have supported this view as well) mainly because of MAF misreads leading to advanced ignition and leaner fuelling, but if this happens you'll lose bottom end torque and risk detonation, and it is not a very good way to get more out of a car by kludging the readings to one of its most important sensors.

[Edited by john banks - 4/24/2003 6:37:47 PM]

 

I did have tek2 remap at the same time as fitting the RSK

 

the hks racing kit isnt that expensive as am thinking of buying from christianr , who says the filter will be fine on my car! but then i only know where to put the fuel

 

Have to take issue with John on the HKS effect on maf, if the supplied spoiler gasket is correctly installed there is no problem, having fitted APS CAK, HKS and 57i back to back on my own car I have some pretty good data. You must install the spoiler gasket though.

The one filter I would not recommend to anyone even with a remap is the APS CAK, its restrictive as well as screwing the maf out put, yes you can get it remapped, big price to pay just to use a filter and means you can never use anything else without paying for another remap.

My view is the 57i kit is the best all round for filtration and performance but even that has some maf influence. And it can be used with an APS FMIC as well. HKS suction is best used with a density-rpm ecu which was how Christian used his.

bob

 

Am I correct in thinking that both Bob & John only recommend changing the Air Filter to something like the K & N if you are having a remap

Or is adding one without a remap ok

Sorry if I got confused with the answers (not that techie with cars)

Steve

 

Bob didn't realise about the gasket as I hadn't fitted the kit myself or seen the instructions. I've refused since to map anything with this induction kit as I was so horrified and the problem didn't seem documented like the APS, maybe that was unfair if it was fitted incorrectly. Makes sense really since there is no great big bend before the MAF on the HKS so no reason for the readings to be that off. Can you describe what the missing part looks like?

Re APS: Do you think it is the filter or the bend that is restrictive (I ran without a filter for a test (not recommended to others BTW ) and the result was the same to within 1 BHP at 20G 1.6 bar power levels) but it still had the bend on.

 

so is the racing suction kit good even though i will not be getting remapped

[Edited by stevebt - 4/24/2003 11:26:37 PM]

 

had a K+N on for about 3 months, just borrowed an BLITZ SUS POWER , been out this eve no diff in noise ,but the BLITZ pulls alot stronger much lower down the rev range, quite impressed, prob not as good at filtering the air but the car ran fine ,even smoother, thats on a version 1 sti ,hope that helps.m.

 

Steve it seems the mapping issue is spurious, but you do hear of a lot of MAF failures. I think if you keep the original ECU because it still uses the MAF sensor you are better with a K&N as it appears to have a lower failure rate.

 

I been running BLITZ SUS for 2 yeas now and no problem I live in Kuwait some time gets so dusty the care runs so good some of my friends have K&N but they want to change to BLITZ

 

stevebt - it will be fine - and plus, you are having a remap anyway!

 

Bob Rawle, What is the "spoiler gasket" you speak of?

 

Christian how is it fine when people serially blow MAFs with them? Maybe they don't misread like I thought if they are installed properly, but some people still seem to eat MAFs with them. Sounds to me like you should use them with a Link or other speed density setup as Bob is saying rather than on the most fragile MAF sensor Subaru seem to have used?

 

Listen to John Banks.

I would go as far to say stick with a standard panel filter and avoid induction kits all together, as they DO suck in crap and cause rough runnning and MAF failure.
Best wishes
Steve

 

HKS supply an aluminium gasket, it is designed to be installed between the filter and the maf, it has "ears" so that it "spoils" the air flow causing it to become more "mixed" is evens up the air flow distribution. Using that I have not found a problem, the APS problem is down to the cast pipe imho, the filter is just a K & N cone when all said etc and not a very big one at that.

A "good" induction kit when used properly (read with remap) will always be better than the same car remapped with a conventional panel, using an induction kit on a car that is not remapped may or may not be ok depending on the car and other mods, since most later cars are mapped to run very rich in the boost areas its normally ok there but cruise can suffer as the maps are set lean for economy.

Its an old debate, I would stick to the filters that are known to be the most reliable, its worth mentioning that the maf is considered consumeable and can fail with or without induction kits to assist. Diferent experiences will seem to show patterns but, its a variable feast.

The APS is definately a problem in maf terms, the Blitz definately doesn't filter, I found a thick gunge just about to destroy my turbo when I used one for 6 months on my STi2 Wagon.

Bob

 

Not much of a technical answer, but buying k&n is for 1.3 Nova Sr's.

No offense, if i owned a jap car i wouldnt touch it.

blitz,hks,Junauto i would, i wouldnt even use Magnex on a jap super car.

Doesnt make the cut imho

Si

[Edited by super_si - 4/26/2003 9:33:11 PM]

 

I don't know I've used a K&N on my car since the FMIC went on that was about 30,000km ago. Only thing to have problems was the MAF (AFM to us in Australia) and that was only after a service where the mechanic inadvertantly over oiled it.

(since put a Link on so I don't have to worry about the MAF ever again)

Cheers
Brett
MY00 (Aust Spec)

 

When we talk HKS kits, is it then the HKS Powerflow kit or is it the HKS Racing Suction kit? As far as I know, it's only the RS kit that comes with the aluminium gasket, and there is quite a difference in price on the two kits.