Holley Carb Tuning with AEM A/F gauge - Page 3 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #31 of 37 (permalink) Old 04-28-2019, 03:19 PM
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Re: Holley Carb Tuning with AEM A/F gauge

Float level is often ignored but it's fairly critical.
To throw a wrench in the works, often with a mechanical pump what is good at idle might be a problem at WOT or cruise, etc.
I'm a fan of regulating at a low pressure for this reason. Another bonus to low pressure is you can have the float itself set high as it will not take a ton of bouyancy to seal the needle, this allows for more float drop at WOT. Seems counter intuitive, but running lower pressure can actually provide more fuel availability simply due to this....

With 550hp I don't seem to ever be lacking fuel at 4.5psi. Makes float settings more consistent and blowing past a needle less of an issue.


That said, Holley part quality is hit or miss these days. I can't trust anything, new out of the box no matter the brand. I have found a ton of needle/seats that were weak brand new.
This is why despite the trouble it is to do it, every carb I ship out gets tested here. Far easier to catch an issue in my shop than it is when it's 1,000 miles away on a customer's car.


Drew
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post #32 of 37 (permalink) Old 04-28-2019, 04:40 PM Thread Starter
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Re: Holley Carb Tuning with AEM A/F gauge

Quote:
Originally Posted by DeepRoots View Post
Float level is often ignored but it's fairly critical.
To throw a wrench in the works, often with a mechanical pump what is good at idle might be a problem at WOT or cruise, etc.
I'm a fan of regulating at a low pressure for this reason. Another bonus to low pressure is you can have the float itself set high as it will not take a ton of bouyancy to seal the needle, this allows for more float drop at WOT. Seems counter intuitive, but running lower pressure can actually provide more fuel availability simply due to this....

With 550hp I don't seem to ever be lacking fuel at 4.5psi. Makes float settings more consistent and blowing past a needle less of an issue.


That said, Holley part quality is hit or miss these days. I can't trust anything, new out of the box no matter the brand. I have found a ton of needle/seats that were weak brand new.
This is why despite the trouble it is to do it, every carb I ship out gets tested here. Far easier to catch an issue in my shop than it is when it's 1,000 miles away on a customer's car.


Drew

that's interesting. I put a pressure gauge on my car but could only measure the output in the garage. It was a consistent 6 lbs.

Even carbs are part of the competitive retail market where price is king. There will always be pressure to meet a price point, meaning quality will suffer in some areas. I'd be interested to see what they use as an acceptable number of defective returns.

Now, you planted the seed to put a regulator on it to see how it runs at 4.5 psi. I agree with the float bowl comments.

It sounds like you have a good plan to ensure quality products are delivered to the customer. Good job on that. thanks for the information.
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post #33 of 37 (permalink) Old 04-28-2019, 05:00 PM
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Re: Holley Carb Tuning with AEM A/F gauge

Price point does matter, and I think in a large sense it is a selling point for fuel injection :P (we sell crappy carburetors, so you might as well buy our crappy fuel injection as it is marginally better).



The $299 special carbs that have come through here have been horrible in regards to quality control. Missdrilled holes, etc I've actually stopped accepting that work except for rare cases where I just like the person or I find their project interesting.

I regularly take a customers core of varying value and charge them $400 to completely restore, replate, blue print and test it.
I've never heard a negative comment regarding price, so obviously there are many who view the service as valuable. This wasn't meant to be a ego stroke or an advertisement, more that many people understand how critical these things are and are willing to pay for them.


Even with the care I try to attend to these carburetors, fuel pressure and ignition timing are still out of my control and I would wager are 99% of the issues that crop up, I've published guides for people, but it seems I have to reiterate the same things.


Drew
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post #34 of 37 (permalink) Old 04-28-2019, 05:07 PM
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Re: Holley Carb Tuning with AEM A/F gauge

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Originally Posted by 65merccyclone View Post
Yes. The car came with a BP 306 installed in it. Documentation says it makes 390 hp.
Nice im looking at their 306 short block for my build but I got some people telling me the engines aren't blue printed nor are they tested like they proclaim. But for me its the only one I was able to find that was reasonably priced with a decent warranty.
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post #35 of 37 (permalink) Old 04-28-2019, 05:12 PM
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Re: Holley Carb Tuning with AEM A/F gauge

Quote:
Originally Posted by DeepRoots View Post
Price point does matter, and I think in a large sense it is a selling point for fuel injection :P (we sell crappy carburetors, so you might as well buy our crappy fuel injection as it is marginally better).



The $299 special carbs that have come through here have been horrible in regards to quality control. Missdrilled holes, etc I've actually stopped accepting that work except for rare cases where I just like the person or I find their project interesting.

I regularly take a customers core of varying value and charge them $400 to completely restore, replate, blue print and test it.
I've never heard a negative comment regarding price, so obviously there are many who view the service as valuable. This wasn't meant to be a ego stroke or an advertisement, more that many people understand how critical these things are and are willing to pay for them.


Even with the care I try to attend to these carburetors, fuel pressure and ignition timing are still out of my control and I would wager are 99% of the issues that crop up, I've published guides for people, but it seems I have to reiterate the same things.


Drew
At work we've ran a regulator and dropped pressure down to 3.5-4.5 psi when the customer brings a vehicle in complaining about hot restarts on their carbed engines. seems reducing the pressure in these cases prevents the hot restart issue. I personally never had the issue on my carbs with hot restarts but there are people out there that do and the dropping of fuel pressure works.
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post #36 of 37 (permalink) Old 04-29-2019, 08:51 AM Thread Starter
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Re: Holley Carb Tuning with AEM A/F gauge

Quote:
Originally Posted by DeepRoots View Post
Price point does matter, and I think in a large sense it is a selling point for fuel injection :P (we sell crappy carburetors, so you might as well buy our crappy fuel injection as it is marginally better).



The $299 special carbs that have come through here have been horrible in regards to quality control. Missdrilled holes, etc I've actually stopped accepting that work except for rare cases where I just like the person or I find their project interesting.

I regularly take a customers core of varying value and charge them $400 to completely restore, replate, blue print and test it.
I've never heard a negative comment regarding price, so obviously there are many who view the service as valuable. This wasn't meant to be a ego stroke or an advertisement, more that many people understand how critical these things are and are willing to pay for them.


Even with the care I try to attend to these carburetors, fuel pressure and ignition timing are still out of my control and I would wager are 99% of the issues that crop up, I've published guides for people, but it seems I have to reiterate the same things.


Drew

It sounds like you are providing value to the customer, which is always good. I didn't think I had a bad carb. I thought I had a tuning problem all along. Things changed after I couldn't adjust it using the AEM gauge. The kicker was the fast idle screw preventing the proper adjustment of the transfer slot. Keep up the good work.
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post #37 of 37 (permalink) Old 04-29-2019, 08:55 AM Thread Starter
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Re: Holley Carb Tuning with AEM A/F gauge

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Originally Posted by Rusty_S85 View Post
Nice im looking at their 306 short block for my build but I got some people telling me the engines aren't blue printed nor are they tested like they proclaim. But for me its the only one I was able to find that was reasonably priced with a decent warranty.

So far, I have found their customer support to be very good. Responsive, knowledgeable and willing to help. Since I bought my car with this engine installed, I didn't have the option to look at other suppliers. This engine was over $5K. I can't comment on what you have heard from others regarding testing etc. I hope you get the right engine, no matter what vendor you choose.
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