Running LS engine on just open manifolds

[IIGW]

Zombies!!!

[solidaxel]

If you have a use for a "Y" pipe and muffler I made one for a temp trip to the muff shop and you are welcome to it I am in the NW area of Tucson and you can come and get it!
You will need the first 6" of pipe and flanges on your manifolds as they were cut off to make my exhaust.
Let me know

[Wasted Income]

Originally Posted by Super73

Wasted, Not trying to correct you, but rather add to your comment. I am sure you will agree with me, it doesn't need to be major changes.

Some items that can and will affect things enough to knock a stock VE in OL/SD "limp mode" to show Ltrims +/- >10 would be:

Changing the intake tube to a different diameter/length
Ported MAF ends (haven't seen them discussed in a long time)
Going to a different intake manifold (LS1 to a Fast 102mm)
Headers with free flowing exhaust


Some of the above mods might not let it "run fine" as the VE hasn't been adjusted for the changes in airflow.

My old 01 SS had a major Ltrim issue with Lid/MAF ends/Ported TB but stock manifolds.

Super, thanks for filling in the blanks. You're absolutely correct that all that stuff will skew the MAF readings and/or throw off the VE table, and would definitely need a re-tune.

I was more saying that unless you do a bunch of stuff to really throw off the VE....in addition to not having any O2 feedback, (cubes, compression, huge cam, etc) you'd have no problem cruising it to the muffler shop in open loop/speed density. It might not run great, but you won't hurt anything as long as it doesn't get beat on until it's tuned.

Originally Posted by boostedc10

Man this post went out to left field quick!

I feel the need to do this forum a favor and provide a quick overview of what we have learned so far:
1. Open headers are ok on go-karts if you have a vise to fix the valve and a rag handy for after the fix
2. You need to have at least 6"s of pipe in your pants to drive it successfully
3. Race stuff uses Zoomies!
4. ZOMG fast stuff!!!!
5. Br3w isnt at boss status because he doesnt have fancy covers for his zoomies
6. On other planets the vehicle will go into Closed Loop without O2 Feedback
7. No O2 feedback allows gas to poor out under the car
7. Zombies are in our exhausts!
8. Knowing is half the battle, as stated by B3ws graphs
9. I am still looking for the Zombies and gas
10. ZOMG Facts!!!
11. Long Term Trims are affected by intakes, modded MAF's, Headers and changes in the intake path
12. DONT FORGET THE GAS!!!

I am pretty sure this summary will provide the next person with this question the facts about driving with open headers!

Your sense of humor is waaaaaaay too similar to mine....you're crackin me up.

[boostedc10]

Lol Wasted, at least my sense of humor isn't going to waste!

[LS-K]

Originally Posted by solidaxel

If you have a use for a "Y" pipe and muffler I made on. r a temp trip to the muff shopinto ou are welcome to it I am in the NW area of Tucson and you can come and get it!
You will need the first 6" of pipe and flanges on your manifolds as they were cut off to make my exhaust.
Let me know

Hey thanks a lot for the offer. I'm just gonna roll onto a flatbed or something. I live in Vail and taking it into tucson in this condition will be a headache.

[solidaxel]

AAA is your friend,95.00 a year 100 miles and 5 tows !!!

[Billett]

I see you like explanations for your explanations...


I'm just here to agree with everyone else. When I was putting my swap together, (all stock mind you), I just left the o2's in the headers, (oh yeah except those), and unplugged the MAF from the ECU and it drove around fine. I took it to my exhaust shop like that and haven't had any problems since.

[BR3W CITY]

^^forced SD