capa otrcai with maf and no tune

[Archers]

hey guys just a quick easy one i hope im looking at a capa otrcai and im gonna keep my maf and no tune just wondering how many people have done this? will i see gains without a tune? or will it be sluggish and not run right? thanxs scott

[kuzman89]

It will be fine, the ecu should adapt over a few days so it won't run lean or anything. Will still pickup kw and nm. And def better fuel eco.

You planning on any mods after this?

[Archers]

thanxs for the input, just the exhaust and extractors then cats and just enjoy for a while

[monaro327]

it will run, you wont have any major issues. it will run a little on the rich side should pickup a bit of power. don't believe any of those the ecu will adapt wives tails.

i'd get a mail order tune atleast to take full advantage of the otr.

[kuzman89]

But the ecu does adapt...

[ssavage]

from what ive herd you will need a tune if you get extractors otheriwse the check engine crap will keep flashing

thats prob the main reason i did exhaust extractors otrcai and dyno tune all at once

[monaro327]

from what ive herd you will need a tune if you get extractors otheriwse the check engine crap will keep flashing

thats prob the main reason i did exhaust extractors otrcai and dyno tune all at once

This is true for changing the CATS cat back extractors(as long as the cats aren't moved) and otr which retains maf should not throw a check engine light.

[monaro327]

But the ecu does adapt...

Not really. being a ecu can adjust whats called long term and short term fuel trims. being can lean or enrich the fuel mixtures at cruising speeds this is aimed to keep emissions in check.
in terms of performance though when you got to WOT(wide open throttle) situations the ecu goes into closed loop meaning all that is being measured really is engine load (MAF) and this is being used as a reference against the ecus ignition and fueling tables which are static and cannot be changed unless the car is tuned.

your car must have a cop chip??

[kuzman89]

Well when I said adapt, I didn't mean in the same way as a tuned ecu would lol.

[benji09ssv]

i just brought a ramjet OTR with the MAF still on and have noticed a huge diffrence, before this i had a SS induction growler kit.

[Grennan]

i just brought a ramjet OTR with the MAF still on and have noticed a huge diffrence, before this i had a SS induction growler kit.

The SS inductions stuff is...well one step short of being shithouse.

How is the Ramjet? I was going to wait to see how it performed but after I saw the right angles on the intake I decided against getting it.

[JonnyDe]

Not really. being a ecu can adjust whats called long term and short term fuel trims. being can lean or enrich the fuel mixtures at cruising speeds this is aimed to keep emissions in check.
in terms of performance though when you got to WOT(wide open throttle) situations the ecu goes into closed loop meaning all that is being measured really is engine load (MAF) and this is being used as a reference against the ecus ignition and fueling tables which are static and cannot be changed unless the car is tuned.

your car must have a cop chip??

The modern ECU takes readings from everything constantly. Plug in a Tech2 unit and you can see everything which is happening. As soon as you put in your 98 octane fuel the ecu will advance the timing further as it realises it can. And will keep advancing until knock occurs, then bring it back. So with cooler air coming into the motor. The ecu can adapt.

But you gotta remember is dosnt adapt for performance, just optimum running condition. So you will need a tune for full benifets

[monaro327]

The modern ECU takes readings from everything constantly. Plug in a Tech2 unit and you can see everything which is happening. As soon as you put in your 98 octane fuel the ecu will advance the timing further as it realises it can. And will keep advancing until knock occurs, then bring it back. So with cooler air coming into the motor. The ecu can adapt.

But you gotta remember is dosnt adapt for performance, just optimum running condition. So you will need a tune for full benifets

If an ecu can adapt to intakes then why do i have dyno sheets showing different AFR for 4 different intakes. stock intake shows 1 afr which is different for airhammer and different for otr and different again for aircharger.

Also your wrong about the octane tables, there are 2 table high and low octane, the ecu can move between these tables but not above or below....
i never said the ecu wasn't reading from several different sensors i have a tech2 but everything is basically ignored at WOT except the key stuff. WOT is closed loop and referenced as per the tune tables.

[voodoo-VE-SS]

Fitted a ram jet 3 weeks ago. engine light keeps coming on. norrowed it down to oil in K&n filter contamenating maf.any other thoughts would be appreciated.

[voodoo-VE-SS]

had the ramjet on my ve ss 4 weeks now. my car is brand new. Still cant get my car to stop engine light comming up bank1 bank2 running lean.thought it was k&n filter contamenating maf. but it isnt. put back to standard,no codes for a week an a half. I work in the car industrey so i have got the use of a tec 2. I am dissopointed GM Motorsport advertise ramjet just bolts on. i will have to folk $700 bucks to have it tuned now. Our leave it off and waste $570 bucks. Has anyone else had exsperiance with a ramjet.

[geo41e]

voodoo

get the car tuned - if possible, by Sonny if ur in Sydney

with OTRs, air is rammed in so ECU thinks there too much air, hence more fuel - runs rich, can trigger engine lights/codes.