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It has sidepipes. Hopefully that's not the reason.
Couple of pics cuz we have to have some pics:
Sidepipes are not helping the car. The primaries are too long on the headers, and this interferes with the exhaust gas pulse. This can kill low end torque and probably the reason why you cannot spin the tires.
I’m not convinced that a new or different carb is going to solve this issue. I would try tuning this one better first. You should be able to get decent performance out of it. That and good timing should make things a lot better.
OK just did this. Black soot/finger on both sides. It usually smokes a tiny bit on startup after sitting several days but nothing major. Doesn't burn oil.
Sidepipes are not helping the car. The primaries are too long on the headers, and this interferes with the exhaust gas pulse. This can kill low end torque and probably the reason why you cannot spin the tires.
Ugh, if that's the reason then that's a bummer because I love the sidepipes. And the inserts are pretty loud now so I'm not sure if I would want to go louder, if that would help. Although I do have the STS baffles still. Maybe I'll try swapping those in at some point. But can't do it now.
As a side pipe user, I can definitely say it’s NOT the side pipes. Sure they are not optimal compared to a well thought out rear exhaust, but it’s not killing his performance.
I’m not convinced that a new or different carb is going to solve this issue. I would try tuning this one better first. You should be able to get decent performance out of it. That and good timing should make things a lot better.
what intake manifold are you using?
Intake is Weiand Warrior, which is the only one that fits supposedly.
Maybe I just take it up for a dyno tune with this carb on at some point. Will have to wait till it warms up a little and salt is off the roads. I think I know of a couple around here. I do have all of the rods and jets for it.
Intake is Weiand Warrior, which is the only one that fits supposedly.
Maybe I just take it up for a dyno tune with this carb on at some point. Will have to wait till it warms up a little and salt is off the roads. I think I know of a couple around here. I do have all of the rods and jets for it.
ok, nothing wrong with that intake. It’s a dual plane and not an RPM version. Should work well for this engine.
you’d be amazed how much power a too rich mixture will kill. 20% to 30% easy.
Last edited by REELAV8R; Jan 28, 2022 at 01:33 PM.
ok, nothing wrong with that intake. It’s a dual plane and not an RPM version. Should work well for this engine.
you’d be amazed how much power a too rich mixture will kill. 20% to 30% easy.
Wow - I did not know that. Definitely then the first thing to try. Too bad it's January.... crap.
I should probably also invest in a UEGO sensor and gauge. A little more difficult with the sidepipes though. Without that you're sort of guessing. Unless there's a ton of black soot in the exhaust.. Doh!
Here is the calibration guide. I am using the stock No. 1 setting. Sounds like maybe go to 2, 3 or 5.
yes, #1 is for sea level @ 59* standard pressure 29.92” .
you’re @ 1300 feet. That means you’ll need to get down to 38*, 29.92” (temp of air to the engine) to get you down to sea level
another consideration is how are you getting the air to the engine? CAI type intake or underhood air with an open element.
if it’s open element then You’re gonna need leaner jetting than cold air intake air. Pulling in underhood air reduces it’s density considerably. In either case, it’s running far too rich.
that 20% to 30% is primarily prior to peak torque. At higher RPM the engine can tolerate the richness, still with a loss of output however.
remember manual chokes? Forget to push it back in. Next time you stop the engine will barely run. Try accelerating hard that way, it’s a huge power killer.
yes, #1 is for sea level @ 59* standard pressure 29.92” .
you’re @ 1300 feet. That means you’ll need to get down to 38*, 29.92” (temp of air to the engine) to get you down to sea level
another consideration is how are you getting the air to the engine? CAI type intake or underhood air with an open element.
if it’s open element then You’re gonna need leaner jetting than cold air intake air. Pulling in underhood air reduces it’s density considerably. In either case, it’s running far too rich.
that 20% to 30% is primarily prior to peak torque. At higher RPM the engine can tolerate the richness, still with a loss of output however.
remember manual chokes? Forget to push it back in. Next time you stop the engine will barely run. Try accelerating hard that way, it’s a huge power killer.
Yes, standard open element K&N with open top on drop base.
So if I want to go a little leaner on cruise AND power, I should go with calibration setting #3 ?
Yes, standard open element K&N with open top on drop base.
So if I want to go a little leaner on cruise AND power, I should go with calibration setting #3 ?
I would try #5 for cooler temps normal driving, if that's too lean then #6, kind of depends how much time you spend at WOT. Maybe #6 for track time and #5 other times. #3 for summer temps normal driving and #5 for track time in the summer. See how those work.
Learn to read plugs. With side pipes you have easy access to the plugs.
If your issues are mostly with low end performance start with primaries. Then move on to the secondaries once you get that ironed out.
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
WOW! 14 sec ET with all that? Something is WAY off on your motor. I'm running 12.5 ET with my 82 CFI, only two injectors and with my new tune, hope to get into the 11s and I should be able to do that. If that black soot is from your exhaust, you are WAY too pig rich for sure and killing the power. Your AFR is probably way off, put a WB O2 on there and see what's going on. GL and hope you figure out what's going on, but fuel would be my first suspect...Get the fuel right first.
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
Yep, you need a afr meter. No guess work. Cheaper than buying a new carb. You can also install it just for tuning and then remove the sensor and plug the bung.
