RX-7Havik

Installed custom cai using a setup from ebay. Have it running down where the washer res used to be located. So I am actually getting true cold air. There is a noticable diff, however I am noticing some unusual lag, almost as if all my new cold air is too much for my fuel keep up.

Does this sound correct? I am not positive, but would bigger injectors solve this problem or would opening my exhaust do the trick. I am still running stock setup with all cats in place, but looking real ragged. Have my downpipe to replace from manifold back. Just need the rest. Going RB.

88GTU/NA

Mx6-Rx7 Addict

Doubtfull. Most NA's can actually benefit from leaning out the stock fuel map to create more power with a conservative setting, and also keeping away from running too lean.

Not sure why you would feel a lagging. Is the AFM positioned correctly?

-Justin

gingenhagen

From what I've read, there is no need to upgrade your injectors.

beefhole

iTrader: (29)

Yeah I saw you have an 88, which means flapper type AFM. It might not be positioned correctly.

rick_tj

Just incase you're not sure what we mean by AFM, its the Air Flow Meter. Its that box type thing that the air goes through after the air filter. It has a door inside it that lets the air go through, or not go through. If its not positioned correctly, your performance and mileage will suffer. Post a pic or two of your setup.

jon88se

Post pics of the setup and we can better assist you...you didn't run out of injector, the stock 460cc's have plenty of fuel for an NA setup. Are you now getting a 3800 rpm hiccup?

uRizen

iTrader: (2)

Did the CAI you put in have a nipple for the BAC air supply? I have one, but the BAC nipple won't work for my car and I was thinking of putting on eof those little air filters on the metal tube that runs behind the throttle body to the BAC.

RX-7Havik

Okay good to know I don't have to spend more $$$ on injectors.
I have the AFM positioned pretty close to how it came off. It is not installed upside down like I have seen on some other FC's. I will get a photo soon.
Could it just be that my injectors might need to be pro-cleaned? Or is it as simple as changing my f-filter? The lagg I am getting wasn't there before I installed the cai. I'd guess after 4000-5000 it is somewhat noticable. I doubt I have the AFM positioned wrong.

One last thing, if I WERE to go with 550 & 720....is there any harm in it? Will I gain HP out of it or just burn more fuel? Thanks guys.

RX-7Havik

It came with two nipples. One I have the 1"hose running to it and the other I have plugged.

rick_tj

With only a CAI, larger injectors would literally be a waste of money and fuel. It would be dumping way more fuel than what's necessary. If you scroll up, I believe someone else mentioned that its actually better to lean out the fuel system with the CAI than it is to richen it up with larger injectors. Maybe after a full performance exhaust system is put on there.

RX-7Havik

Sounds good. Okay, so larger injectors will be needed if I put on a race pipe with RB catback?
I will try and lean out my fuel then.

rotaryrudy

iTrader: (2)

with an N/A you really dont ever need to get larger injectors unless you are running big mods like porting

NZConvertible

Nope. The actual amount of air entering the engine has only changed by a small amount, certainly not enough to have any effect on the EFI system.

iceblue

What you are exsperiancing is a curve in your HP map. You are gaining peak HP from your setup but an entire different curve this is what your feel is. The longer the filter/AFM is away from the TB the flater your curve becomes. this will increase your top speed and peek HP but shorten your low end HP and lessen your acceleration. Thus your care becomes faster but not as quick. If this is not the feel you are looking for then use a RAM air from the hood and make the distance from the filter to the TB as short as you can.

NZConvertible

Um, no...

iceblue

Umm Yes

jacobcartmill

iTrader: (6)

what are you talking about man? that is one of the craziest posts i have ever seen on here.

NZConvertible

Exactly. It made no sense at all, and is completely wrong.

RX-7Havik

You hit the nail right on the head. That is exactly what I am feeling now. I am feeling a totally diff acceleration. Low end seems like it suffered a little, but high end got faster. That is what I was wondering about, the diff feel. Makes sense to me.

MARTIN

Quote:
Originally Posted by iceblue
What you are exsperiancing is a curve in your HP map. You are gaining peak HP from your setup but an entire different curve this is what your feel is. The longer the filter/AFM is away from the TB the flater your curve becomes. this will increase your top speed and peek HP but shorten your low end HP and lessen your acceleration. Thus your care becomes faster but not as quick. If this is not the feel you are looking for then use a RAM air from the hood and make the distance from the filter to the TB as short as you can.

LOL. Thats some nice info.





Seems like you two are on the same page...

RX-7Havik

Hey man, that is the most logical explaination I've had so far. Do you not believe there is a diff curve in the HP map? That is exactly what I am noticing. You tell me.

Ah well, look on the bright side....it made you laugh. lol

MARTIN

diff curve while on nitrous, ok, curve while on boost, ok. curve after porting the motor, fine. But I have yet to see a noticeable curve after cai..

Calloway_Roger

yeah, the "hp map" might be different...but I would think the curve would be nearly the same...just a bit higher...I did a similar mod on my old celica and the curve didnt really seem to change at all...just the overall hp...and I hardly even noticed that anything had changed.....

RX-7Havik

Celica & Fc are two very diff cars too. Anyway, who knows. Guess we'll see what happens when I open up my exhaust system. Afterall, all three of my cats remain in service, but look very very shabby.
I'm sure I have a huge restriction with them being in bad shape and having leaks throughout the piping.
Bonez race pipe and Racing Beat cat-back next to come.

End3r

There is so much misinformation here it sickens me. Listen to NZ. 'Nuff said.. . .