It's time to do something about the POS airbox and filter on my 91 RS. I have only seen one cold air intake kit for the 305TBI. I'm wondering if anybody knows of any other cold air kits. I have looked at Ultimate TBI mods and some other threads about fabbing your own. Can anybody tell me what kind of results you got from the home-made cold air kit? If so, which set of instructions did you use? Several out there.

How bout results from any of the cold air kits that are out there? Compared to home-made?

I'd prefer to buy a kit unless I'm really missing the boat. Call me lazy but I'm a paint by numbers kind of guy. I have a talent for screwing up supposedly easy DIY projects.

 

Find a taller lid tbi breather that comes on a tbi truck or caprice. I did that and added a 4" duct [hose] from Autozone and ran it to the same location as the stock mount at the radiator mounting rail. I will feed much more than even a modded 305 . I did cut the heat riser off the one in the photo. It will work even with the heat riser left on unless you have a diagonal strut tower brace


DM

 

Thanks for the pics. I know about the truck lid idea. THe 4 inch hose was just to create a bigger diameter and let more air get to the filter, right?

What kind of gains did you see from doing this? I'm looking for horsepower/torque of course, but I know I won't get a ton from just an intake. I'm really hoping to improve the throttle response and get a little more kick in the seat of the pants. thanks again.

 

More air correct. If you want to start modding this is going to be about as cheap as you can get and will feed plenty later on. To guage what amount of gains this gave me I would have to back up to 1995 and try to find a stock straw size snorkal and install it and see how much of a restriction it would be. I also had the 3" open element and seen little differance between the two except that this one is quieter and you have the option of running cool air from right behind the headlight area.

Hope this helps. Nice to talk to another RS owner in Ga. Did you install the 3:23 gears/rear end yourself?

 

Thats actually a long story. No, a rear end swap was a little beyond my capabilities, mostly because I am stuck working a an apartment parking lot. I had it done by a local shop, and acutally I'm not happy with their work. I originally had them put in a rear end from ann 87 trans-am with a 4.10 (I was planning to go to a 6-speed trans down the road). That gear ate itself up, and so did the next one. I can't prove it was the shops fault (they blamed the used rear end), but they did some other things to make me quetion their honesty and competence. turns out they have a pretty bad rep.

Where in Middle GA are you?

Don't mean to ask the same question 10 ways, but do you think you got any noticeable gains from the intake? I have very limited time to work on my car, and as mentioned, I'm not big on fabbing stuff.

 

Covington area

Yes....I got decent gains from it. The stock breather sux to be honest. It would be good to get some mechanical skills if this is going to be your "hobby car"

PS.......see my reply here

https://www.thirdgen.org/forums/tbi/...uggestion.html

 

I have some mechanical skills (nothing to brag about), my biggest limitation is no garage, lack of time (military) and lack of patience.

Off topic here, but do you have any kind of performance chip in you RS? I am looking at a Jet chip that is on sale for like $20 and wondering if its worth messing with. Again no time for a DIY tune.

 

Read my sig.........http://www.dynamicefi.com/


I would just stay with the stock chip until you are ready to learn. Don't waste cash on any aftermarket chips.

 

So I take it the EBL on that link is what you reccommend whaen its time to get into tuning?

Still its tempting to by the jet chip. Its online for less tahn $50. I'm modding at a very slow pace so its tempting to get some quick gains, even if I ditch it later.

 

You don't have to have the EBL but if you sux at tuning like me it helps plus it does have some features the stock ecm does not have.

I doubt that jet
chip does much...I fell for the Hyperjunk crap 10 years ago. It did d/ck except for getting over 100 of my hard earned dollars.

Read this for further info on chips for tbi.......https://www.thirdgen.org/forums/tbi/...free-tune.html

 

I read your sig and and I really doubt your air intake set up has much to do with your cars performance gains

 

Let me say that without an improved breather no matter what style I believe that the stock units snorkal is a restriction that would hold back any gains from other mod's........how's that?

 

Completly agree stock is for 170hp.

I had something similar once then I calculate the intake surface of the flattened 4" hose and the smallest point of the stock one and compared, it was a little over 1.5x the stock one and wasent flow friendly either.

I did lots of playn with air intakes. Ducting needs to be rather large, straight and short. And the stock base is just as good as the stock inlet.

Im courios, what themperatures does your IAT show?

 

Im courios also.....I am planning to start datalogging again and after that I can tell you. I have been doing other things besides automotive interests for a couple of years. I really wish I had the knowledge and hardware-software 10 years earlier. Could have saved time and $.


Later.........DM

 

Above: "I calculate the intake surface of the flattened 4" hose"

This conversation is starting to border on discussing fluid dynamics (Air flow volumes, pressures). Since we're on the topic...I know just the basics of such things and I have been wondering whether all these home-made intakes made from flexible drier ducting and such are actually helping the airflow, given the irregular inside surface, that is the ribbing that makes a flexible duct flexible, also makes the inside surface wavy. Also, what about folks who connect a bigger duct or hose to the original plastic air inlet, as in the photos at the top of this thread. Its been quite a while since I studied this stuff, but it seems to me that this would creat a venturi effect and actually result in a decrease in intake manifold pressure??? I know there are lots of people smarter than me on here. Anybody got a take on this?

 

I bought this, then drilled a hole for my air temp sensor and voila, my TBI seems to have recieved a welcome increase in throttle response as well as a hugely welcome increase in sucking noise from the TB and a slightly deeper tone from the exhaust (or at least people tell me). My next purchase is a bracket/spacer to raise the injectors up a bit.



Videos (sound sync is off):
http://www.youtube.com/watch?v=rUuVAImZ24I
http://www.youtube.com/watch?v=3_Aec1xROdc

 

You have a good venturi point there. Somewere on tgo a guy did 1/4 's with filter and w/o fiter and he got better times with filter.
You ready to try this?

 

Hey thomas1976. I love that air intake setup. I have never seen that before. Where can I get it? What parts are involved?

 

https://www.thirdgen.org/forums/tbi/...ir-intake.html

 

This is what I ended up with. Original plan was to route to side of radiator but no room. You may be more fortunate to find a cold air source.

OBTY. I have a brand new BONNET never used in box. As shown in pic but 1.25inch taller. Would not clear my hood. Will discount off my cost new. Any interest?

 

the only way this would work is if you relocated your battery