85TIIDEVIL

iTrader: (2)

I currently have a 48 Dellorto on my Turbo II. I used a stock 2nd gen N/A exhaust manifold along with a stock cat off my 98 Mustang Cobra to fill the gap and piece the exhaust together. I take it for a spin around the block, 1/2 a mile or so, pop the hood and the exhaust manifold and cat are GLOOOOWING red. I pull both L plugs and they are on the black side. The two screws on the carb are equally turned out 4.5 turns. I'm thinking keep coming down on the adjustment but then thinking I'm just wasting my time w the stock exh mani and cat there. Do you think it's possible to even run a Dellorto w out the header....?

j9fd3s

iTrader: (3)

to keep the cat happy, you need to run the thing as close to 14.7:1 AFR as you can, as much as you can. then you need to richen it up when the cat temp gets to like 600C

snivley whiplash

iTrader: (4)

go to Gruntled.com - Home and read

85TIIDEVIL

iTrader: (2)

J9 so I would need to pick up a wideband and a EGT...? Or is there one that can do both..??

diabolical1

iTrader: (3)

you mentioned it's a T2, but then you asked about a header. are you running it without the turbo? (just want to be sure)

also, where's your timing and are you sure the cat is still good?

there's no problem running a Dell with the stock exhaust manifold. i did for years before i finally installed the header i had. it's certainly not optimal, but the car will run fine if everything is tuned.

85TIIDEVIL

iTrader: (2)

Diabolical, I am trying to get familiar as I can w the Dellorto since I have a blow thru setup for it. I have a full Racing Beat Turbo exhaust. Without the turbo and down pipe I filled the void w crap I had laying around, stock 2nd gen cast exhaust manifold and what I thought to be a high flow cat since it came off my Cobra. Where my spare part crap attaches to the RB exhaust steps up from 2.25" off the back of the cat into the presilencer which is 3" both OD. I found a exhaust leak today btwn the flange that connects the exhaust mani and cat, wondering if thats causing the glowing....?

I've been playing around w the mixture control screws, test driving and pulling plugs for a few days now. Can't get the glowing to go away, even at idle.

This carb ran like a champ on a 87 13B 6 port some years go and came from Racing Beat.

Ohhh and timing is right on the pin / pulley mark no vacuum advance. I tried advancing a bit 10* leading. Idle smooths out and feels more responsive but still glows.

diabolical1

iTrader: (3)

well, catalog what you have in terms of jets, tubes, etc. and start pricing and (more importantly) sourcing those items, but don't actually buy anything yet. i'm not sure what RB still carries and what they don't, but i remember from my Dell-days, i started having to look elsewhere for some things. the fact that it was running with a 13B before is encouraging, but may end up not meaning anything, so prepare yourself for that possibility as well.

based solely on my understanding of how they work, my feeling is the wideband might a better tool in this situation than the EGT gauge. however, full disclosure, my wideband setup is still sitting nicely in it's box now for about 4 months. i've never used one.

personally, i think there is still room to play with the timing. from what i remember, it was more critical to have the correct advance upstairs than it was to have correct timing at idle.

that said, i wouldn't assume your cat is NOT a restriction based simply on the fact that it came from a Cobra. i vote for removal before you do anything. i'll leave the straight-pipe vs. presilencer decision up to you. aside from that, i definitely question it's integrity now that it's had some time, glowing, behind a rotary's breath. be very sure that it's not THIS simple before you go mucking with the Dell.

before i started tuning mine, the front section (manifold to cat) used to glow, but ONLY when the choke was on. right now all i can remember is getting it stop, but i honestly don't recall how (this was before i had a journal). i ended up running that configuration for years until i put a RB streetport system on the car. mine was OEM manifold to custom downpipe to stock main cat and out the stock post-cat section.

j9fd3s

iTrader: (3)

carb AND a cat has been done before, but the cat requires the correct mixture, and has lower EGT limits than the engine.

85TIIDEVIL

iTrader: (2)

I ordered a wideband today, AEM Uego and dual gauge pod for the Apillar. Should be here by the end of the week.

Also the presilencer from the full RB Turbo exhaust is behind the cat so I'm going to try a straight pipe off the cast manifold to connect the two. I took a sick day from work today to get this done. Not sure if I should rob and try a header from my 1st gen today too.

I'm thinking a stock 87TurboII motor & pulley should play well with a 12A distributor. This is how I ran the 13B 6port n Dell prior w no problems....?

Also I'm going to start looking into ignition. I'm using MSD blaster coils in the stock configuration. Starting to wonder if they're junk.

Thanks for the info.

85TIIDEVIL

iTrader: (2)

So it turns out the cat was starting to crumble apart inside so I replaced it w a straight pipe. Coming off the back / out the stock exhaust manifold I had a small leak btwn the two flanges. It was white and you could see how it was coming right from the leaky area. I fixed the leak w a new gasket and flange. Changed the oil and installed the wideband. Glowing is gone. Idles awesome at 14.5ish and feels much more responsive. Next step is a rebuild kit for the Dellorto just bc.

diabolical1

iTrader: (3)

glad to hear progress has been made. out of curiosity, how did you decide on AEM for your wideband?

85TIIDEVIL

iTrader: (2)

1. Jeff20B (I think) said he picked one up and it worked just as it should. 2. It is a plug and play type, no calibration or whatever you have to do to the other ones to set up. The search button does wonders.

cfamilyfix

iTrader: (15)

Glad to hear it worked out with the dell jim....I have one going on my six port set up...gonna need your help for sure!

85TIIDEVIL

iTrader: (2)

I'm nowhere near done Colin, going blowthru. With all the stock EFI crap still there, unhacked, I could easily have the option to go eitherway oneday w no troubles.