Going Otrcai And Maffless

[andypower5.7]

I recently got my car tuned by Mario at Autotechnique with a result of 221rwk. My current mods are try-y pacey's, 3.5 sureflo exhaust, hi-flow cats, k&n pod charger kit, and 3.73 gears on a A4 clubby which i am quite happy with 221rwks. Can some one give me a rough idea how much of a increase in rwks will i get with the OTRCAI and a maffless tune and will i be happy with the change from maff to maffless please give us your thoughts cheers happy holidays.

[STATIE]

The K&N pod kits are crap - going Mafless and OTR should gain you 10-15RWKW+ fairly easily.

[andypower5.7]

The k&n charger kits are not bad maybe just getting a little bit of heat soak. Should i try with and without the filter on the dyno to see the difference if any. Once the OTRCAI is install how will it run on a hot day as all the air will go in directly into the throttle body = loss in power, and higher temps.

[Oztrack Tuning]

Every 1deg C hotter by the time the air makes the engine is about a 1rwkw loss of power.
I have always found that K&N airchargers create knock easily since the air they suck is hot - this is worst on the road bonnet shut than on a dyno with fan on and bonnet up.

[BLACK 346]

The k&n charger kits are not bad maybe just getting a little bit of heat soak. Should i try with and without the filter on the dyno to see the difference if any. Once the OTRCAI is install how will it run on a hot day as all the air will go in directly into the throttle body = loss in power, and higher temps.

Why would air going straight into the t/b equal higher temps and
power loss :confused:

[andypower5.7]

I mean only on hot days like today which is 40 it wont be the same as a cool day like 20 or less. As i have noticed with my k&n charger kit on a hot day it suffers a bit , and on a cold night or day it hammers a big difference but with the OTR it gets air coming in, in all conditions all the time and i have heard aswell when driving then stoping the car hunts and misses at idle with a maffless tune and otr is this true.

[BLACK 346]

I mean only on hot days like today which is 40 it wont be the same as a cool day like 20 or less. As i have noticed with my k&n charger kit on a hot day it suffers a bit , and on a cold night or day it hammers a big difference but with the OTR it gets air coming in, in all conditions all the time and i have heard aswell when driving then stoping the car hunts and misses at idle with a maffless tune and otr is this true.

Hunting and missing at idle would be a poor tune or other problem
I reckon, not related to OTRCAI. I have noticed the heat related
drop in performance you refer to more with other types of intakes as
opposed to the otrcai I am running now. The Unifilter sealed pod
I ran prior to otr was the worst culprit.

[smokiebbear]

OTR's are good for 5mph down the 1/4. From what i've read it's not unusual to pick up 10-15 kw with one. You may need to adjust the tune when you put one in and it should be good for around 240rwkw give or take a few which is what most members on here are getting.

Definatly worth the coin:D

Cheers - Matt

[andypower5.7]

Hi smokiebbear thats what i am looking for around the 240rwk mark if i am lucky and better in overall performance. Just one thing i cant understand really how much air gets in once bonnet is closed.

[STATIE]

Don't underestimate a genuine 230-240RWKW auto LS1 - they can be weopons on the street and run easily in the mid 12's at the track.

In your case getting rid of the K&N and going OTR will probably give you more of a gain than the conversion to mafless will.

[andypower5.7]

I would be over the moon if i ran under 13's down the track with a OTR maffless tune as it quite fast now as it is.

[smokiebbear]

Hi smokiebbear thats what i am looking for around the 240rwk mark if i am lucky and better in overall performance. Just one thing i cant understand really how much air gets in once bonnet is closed.

The faster you go the more air that is forced in there. Performance will improve greatly, throttle response is almost instant and because your sucking up more air it will also make more noise:D

[andypower5.7]

Will wheel spin be a problem as i am getting mario to make the shifts harder than it is now with the OTR in place.

[smokiebbear]

The more power you get the more wheelspin your car will be prone to but a good tuner will be able to set the car up to get maximum performance as possible and as little wheelspin as possible. If all else fails feather the throttle or just keep it flat and hold on. I haven't dyno'd mine but i think it'd be well up into the 240's rwkw as i have quite a few friends with ls1's and a very good friend tunes them. They have all comented that my ss is a freak and just goes hard but i don't really find that much wheelspin down low due to running the standard 3:07 diff atm and i dare say in your case with 3:73's you may get a bit off the line and a nice chirp into second.

[andypower5.7]

It sure does launch quick from the mark it does chirp 1st to 2nd but not as much as i would want it to. It normally chirps more when you flat stick it and let go just before it changes into 2nd or if you flat stick it all the way to 2nd its weard it changes to quick to notice the chirp if any.

[smokiebbear]

Hi smokiebbear thats what i am looking for around the 240rwk mark if i am lucky and better in overall performance. Just one thing i cant understand really how much air gets in once bonnet is closed.

I took some pics of my otr just then, sorry it's in black and white (bloody mrs playing with the camera) and i know i need to clean under bonnet. This is on a vx ss series 2 so your otr setup will/may be slightly different. The otr is a Orsomm maxiflo fibreglass one.

First up we see how it sits in the engine bay
http://i191.photobucket.com/albums/z93/smokiebbear/otr001.jpg
Second pic shows how the air goes in and straight into the otr
http://i191.photobucket.com/albums/z93/smokiebbear/otr004.jpg
Third pic is up close you can see where the otr sits just above the radiator which is where it catches the air to force upwards
http://i191.photobucket.com/albums/z93/smokiebbear/otr008.jpg
And lastly we see why they are so affective as there is no piping/plumbing for it to travel around to get into the throttle body
http://i191.photobucket.com/albums/z93/smokiebbear/otr017.jpg

Hope that helps

cheers - Matt

p.s if you would like colour pics pm me and i'll take some tomorrow for you:)

[andypower5.7]

That would be great if you could good work nice OTR. What cold air were you running before this one as it must of been a big difference in air mass i would think so. Another thing is i have 20" wheels at the moment which makes it even harder to chirp with quite new rubber maybe i should go back to 18's.

[smokiebbear]

I just had the stock airbox. Honestly reckon i picked up 15+rwkw when i put the otr on. It just goes so much harder. I will take some colour pics tomorrow arvo after work and email them to you. Otr's have a real throaty sound and you'll just love giving it a bootful every so often just to hear it. When you put one on roll at 40-50kph and give it WOT with the traction off. You shoud get wheelspin all the way to 80-100kph depending on your tune.

[andypower5.7]

http://i146.photobucket.com/albums/r256/ANDYSONE/P1040006.jpgThis is my current cold air setup not to bad just maybe getting a bit to much heat soak going to the pod filter. By the way the engine covers will be painted red soon as these were of my vuss hyper yellow ute.

[smokiebbear]

Aaah Hyper Yellow, love that colour although i may be biast as thats the colour of my ss:D Anyhow i'm off to sleep but i'll take those pics tomorrow and put them up for you.

240rwkw should be yours for the taking once you put on the OTR!

cheers - Matt

[andypower5.7]

No worries mate take it easy.

[smokiebbear]

Ok so in 1 of the pics i got under the front bar and pointed directly up and you can see where the otr gets the air from from the underneath shot. On that shot you can see where the hole for the bonnet latch is ....

http://i191.photobucket.com/albums/z93/smokiebbear/otrcolour007.jpg
this is another shot from above
http://i191.photobucket.com/albums/z93/smokiebbear/otrcolour010.jpg
and this is taken front on so you can see the radiator and the fibreglass otr where it catches the air
http://i191.photobucket.com/albums/z93/smokiebbear/otrcolour001.jpg

I will add more datails later as i'm almost running late for work

cheers - matt

[andypower5.7]

Thanks mate your a champ.

[HSVJPL]

I have used the G&D alloy OTR for 3+ years now with great results.

This design, along with the HPF alloy one, are unique in that they pick up the cold air directly from behind the grille (see below)

http://i270.photobucket.com/albums/jj100/jlizza/IM000118.jpg

http://i270.photobucket.com/albums/jj100/jlizza/June06004.jpg

[andypower5.7]

Very nice setup HSVJPL and i can see you keeped your maff in place.