Holley EFI 105mm TB
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Staging Lane
Joined: Sep 2014
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From: College Station, Tx.
Holley EFI 105mm TB Does anyone have experience with the Holley 105mm throttle body with a 105mm Hi-Ram? I've been searching all afternoon and can't find crap! It'll be force fed of course with twin 69/68's through a fully forged 370ci. I plan on purchasing the Hi-Ram soon and really wanna know about this throttle body!
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Staging Lane
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From: College Station, Tx.
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From: Norn Iron
You can basically end up with shitty throttle resolution.
ie in the case of 105mm....it might be flowing all the air the engine can consume at only 50% opening...so the latter 50% does **** all.
Even a standard 75mm has made well over 4 figures
Staging Lane
Joined: Oct 2004
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From: In the garage
There's no real downsides. With a huge TB the car accelerates very quickly off idle with very slight throttle. The engine is getting a huge gulp of air with very little throttle. It's just what you get used to. You just have to learn to drive it so your not dry hopping the car from a stop light.
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Staging Lane
Joined: Sep 2014
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From: College Station, Tx.
There's no real downsides. With a huge TB the car accelerates very quickly off idle with very slight throttle. The engine is getting a huge gulp of air with very little throttle. It's just what you get used to. You just have to learn to drive it so your not dry hopping the car from a stop light.
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9 Second Club
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From: Norn Iron
There's no real downsides. With a huge TB the car accelerates very quickly off idle with very slight throttle. The engine is getting a huge gulp of air with very little throttle. It's just what you get used to. You just have to learn to drive it so your not dry hopping the car from a stop light.
So there are downsides...and absolutely no positives unless you need something large enough for 2-3000hp
What size boost plumbing are you using ?
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Verdad Gallardo Staging Lane
Joined: Oct 2004
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From: In the garage
I have a 531ci Big Block with a 118mm turbo and use 4" intercooler tubing with a single 90mm throttle body. 4.26 at 175mph in the 1/8 is a 6.60-6.70 at 210+. I have considered swapping to a 105mm but wanted to see just how far a 90mm could go. I have not found the limit of it yet.
Ran 8.90's with a 70mm throttle body also.
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Staging Lane
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From: College Station, Tx.
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Staging Lane
Joined: Sep 2014
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From: College Station, Tx.
True, I didn't look at it from that perspective. If I ran a larger cold-side out of the intercooler will it help vastly, or no because of the initial choke point being 3.5" coming out?
Staging Lane
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From: In the garage
I just did charge tubing on a 540ci twin 76mm street car. He put a 105mm on it and its even overkill for that engine. Twin 3" into a single 4".
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From: Norn Iron
As said, even a stock 75mm TB has made over 4 figures with no problems, and with 3" pipework
So unless there are an insane amount of bends, the 3.5" pipework will have no issues supporting almost any power that mere mortals with LS engines will make.
So no, having a 3.5" outlet on the cooler and using 4" pipework...almost seems totally pointless unless you were trying to overcome any additional restriction posed by lots of bends.
And even at that is there any point in such a large TB ? None whatsoever.
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Staging Lane
Joined: Sep 2014
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From: College Station, Tx.
How much power are you expecting to make ?
As said, even a stock 75mm TB has made over 4 figures with no problems, and with 3" pipework
So unless there are an insane amount of bends, the 3.5" pipework will have no issues supporting almost any power that mere mortals with LS engines will make.
So no, having a 3.5" outlet on the cooler and using 4" pipework...almost seems totally pointless unless you were trying to overcome any additional restriction posed by lots of bends.
And even at that is there any point in such a large TB ? None whatsoever.
As said, even a stock 75mm TB has made over 4 figures with no problems, and with 3" pipework
So unless there are an insane amount of bends, the 3.5" pipework will have no issues supporting almost any power that mere mortals with LS engines will make.
So no, having a 3.5" outlet on the cooler and using 4" pipework...almost seems totally pointless unless you were trying to overcome any additional restriction posed by lots of bends.
And even at that is there any point in such a large TB ? None whatsoever.
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From: Norn Iron
As Dustin says, 90mm will be more than enough....with plenty to spare as far as airflow capacity and will make installation with pipework sizes easier.
There is just no sense whatsoever in going excessively large as all it will do is hurt low speed operation as they simply flow far far too much air per degree of blade opening.
There is just no sense whatsoever in going excessively large as all it will do is hurt low speed operation as they simply flow far far too much air per degree of blade opening.
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Staging Lane
Joined: Sep 2014
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From: College Station, Tx.
As Dustin says, 90mm will be more than enough....with plenty to spare as far as airflow capacity and will make installation with pipework sizes easier.
There is just no sense whatsoever in going excessively large as all it will do is hurt low speed operation as they simply flow far far too much air per degree of blade opening.
There is just no sense whatsoever in going excessively large as all it will do is hurt low speed operation as they simply flow far far too much air per degree of blade opening.
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Staging Lane
Joined: Sep 2014
Posts: 86
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From: College Station, Tx.
