Thermoquad issue
For a streeter, with an automatic trans;
If you shut the transfers off completely; you may experience one or more of several problems;
>A tip-in sag as the transfers take time to come back on line.
>Stalling, going into gear.
>A rich AFR throughout the low speed circuit because by the fatly adjusted mixture screws.
>The only way to make the engine run with the transfers shut off, is with a lot of Idle-Timing. This may and usually does, cause problems in trying to build your other timing curves.
> Cold-start issues.
> hot-running issues
> did I mention the dreaded tip-in sag? You can cover this with pumpshot, but then two other things happen; First, you use it up when you should be saving it for later, and Secondly; because the pump is pissing more gas than it needs to; the engine is a gas-hog in town. My goal is always to use as little pumpshot as is possible.
But if a manual trans;
You can't hardly get away with anything below 2000rpm; yur tune has to be pretty right on.
But if a racecar;
You can get away with a lottachit, that won't fly on the street.
Thanks, AJ! I've learned a lot from this site over the last couple of years!! Pretty damn happy with the TQ!! Here's an overview:
-Yes, transfers have been previously shut off. And it is primarily street (strip 2-3 times a year) and is an automatic.
-No cold start issues as it's set up, nor hot start problems. (Choke removed, temp controlled garage.)
-No stalling going into gear.
-No notable tip-in sag. (could it be better?? maybe.) Cam is Lunati solid 235/243 at .050, .526/.546 lift.
-I can reach in the car and turn the key from outside and starts right away when warm, so no issue there.
-My timing is set at 18/38. It likes the 18, the 38 is set from doing timing loops at the track (quickest/fastest there.)
-Plugs read very good now. Light grey/black on ring, small tan ring at base of porcelain, timing mark right on the bend.
-A/F tends to be 13's with light throttle in slow traffic, 14.7 steady :), drops uphill to 15-16.
-Yes, transfers probably covered by my drilled nozzles. (.034 or .038 based on old Demonsizzler posts... Jets are .101/.149.)
-Yes probably burning more fuel in town than necessary with a TQ, not that I'm too worried about that.
So now, I have to decide if it's worth it to mess with what's working just to open the transfers a bit...
As a carpenter I used to work with used to say: "Don't F**k with it. ...If you F**k with it, it'll look F**ked with!" :rofl: