hi so i picked up an FiD stock replacement manifold and would like to know if its okay to run this without a tune. this would be the only thing my car isnt tuned for, as far as as parts its tuned for (that should matter) would be

comp 280 cams
jun BL exhaust
downpipe
fic 1150 injectors
intake
intercooler piping
stock turbo
walboro 255

car currently is tuned slightly rich (about 10.5 to 10.7) at wot

i know the true gains will come from being tuned which im gonna do pretty soon but what kind of gains can i expect from just putting it on the car without one vs my stock unported manifold? i just got my car tuned a few months ago and was hoping to hold off paying for another tune until i have more parts to throw on.
thanks for any advice!

 

I could see it going fairly lean with the manifold. It depends on how much the stock mani is choking the setup, but I wouldn't put it on without a tune.

 

i drive with ported im and tb and fp cast race ex mani without tune for around 2 months now.i just not beating on her,afr normal.

 

alright good to know, i know i had seen dyno sheets where the vehicle had been tuned for a ported manifold and they threw on tubular replacement without retuning and it was just fine but i guess i will install it and watch the A/F ratios, if need be ill just remove it.

would anybody know if I unplug the positive on my battery for 10 or 20 minutes will it reset fuel trims? I thought i read after fuel trims are reset i can let the car idle for 10 minutes to relearn in case it would help after installing the manifold, thanks again guys

 

Yep def reset battery for relearn--it will help move toward the optimum--granted the ability to change and the range of change is limited by tune. Watch your mixture and try and avoid WOT to redline and I think you will be fine--your very rich at 10.5.

 

well just a little update, the FiD manifold was a pain to install just because how tight of a squeeze it was trying to tighten each bolt down but I got it it done, I also did the relearn and the car seems fine.
im not sure how to share videos on here but the A/F during idle bounced between 14.2 and 15.2 (honestly hard to tell with the cams) and after a little driving and feeling more comfortable with the a/r ratios and i did a 2nd, 3rd, and 4th gear pull and the car sat at 10.9 and 11.0 at WOT.

I dont plan on beating on the car much but as long as I'm easy on the car I'm guessing it should be solid until I can get a new tune? I feel like the relearned helped quite a bit

 

the engine bays a little dirty at the moment but here it is haha

 

You shouldn't need a tune just don't beat on her. True test will be to put it on and turn the key.