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Throttle response and EFI

General engine tech -- Drag Racing to Circle Track

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SpeierRacingHeads
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Throttle response and EFI

Post by SpeierRacingHeads »

I think it's pretty good. The induction worked out well. Has some scat from off idle.

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Re: Throttle response and EFI

Post by RevTheory »

Definitely a snappy dude.
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Re: Throttle response and EFI

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Re: Throttle response and EFI

Post by FuelieNova »

Who's EFI controller are you using?
Any details on the build?
Tom
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Re: Throttle response and EFI

Post by SpeierRacingHeads »

FuelieNova wrote: Mon Sep 14, 2020 5:11 pm Who's EFI controller are you using?
Any details on the build?
Tom
Holley HP

379 with 10-1, 231/235 cam, SRH 205cc CNC heads on 91 octane.
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Re: Throttle response and EFI

Post by ptuomov »

Is this a plenum manifold with throttle body injection?

If it’s a plenum manifold with a throttle body injection, why wouldn’t it be better to use the same number of throttles and injectors in an independent throttle body system with the throttle close to the port and injector spraying into the runner?
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Re: Throttle response and EFI

Post by SpeierRacingHeads »

ptuomov wrote: Tue Sep 15, 2020 9:08 am Is this a plenum manifold with throttle body injection?

If it’s a plenum manifold with a throttle body injection, why wouldn’t it be better to use the same number of throttles and injectors in an independent throttle body system with the throttle close to the port and injector spraying into the runner?
The main reason I did this is because I wanted to maintain the Camaro air inlet system.

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Re: Throttle response and EFI

Post by ptuomov »

I can see that the air filter etc would be time consuming to refabricate. I have no objections with a single throttle plenum EFI manifold with port injectors. That’s what I got!

I was more commenting on the EFI university Holley sniper system that has eight throttles but looks like a plenum manifold with throttle body injection.
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Re: Throttle response and EFI

Post by bob460 »

ptuomov wrote: Tue Sep 15, 2020 11:17 am I can see that the air filter etc would be time consuming to refabricate. I have no objections with a single throttle plenum EFI manifold with port injectors. That’s what I got!

I was more commenting on the EFI university Holley sniper system that has eight throttles but looks like a plenum manifold with throttle body injection.
400ci......1200+hp.........10,000+rpm.......nothing more to say!!

https://scontent.fmel6-1.fna.fbcdn.net/ ... e=5F85E6EA
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Re: Throttle response and EFI

Post by ptuomov »

bob460 wrote: Tue Sep 15, 2020 7:57 pm
ptuomov wrote: Tue Sep 15, 2020 11:17 am I can see that the air filter etc would be time consuming to refabricate. I have no objections with a single throttle plenum EFI manifold with port injectors. That’s what I got!

I was more commenting on the EFI university Holley sniper system that has eight throttles but looks like a plenum manifold with throttle body injection.
400ci......1200+hp.........10,000+rpm.......nothing more to say!!

https://scontent.fmel6-1.fna.fbcdn.net/ ... e=5F85E6EA
If you only drive the car at full throttle, obviously most of this stuff is moot. The location of the throttle or throttles doesn’t matter. However, since the thread title was throttle response, I think it’s relevant how the engine cruises at part throttle without surging and then takes off without a bog when floored.
Paradigms often shift without the clutch -- https://www.youtube.com/watch?v=cxn-LxwsrnU
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Re: Throttle response and EFI

Post by SpeierRacingHeads »

ptuomov wrote: Tue Sep 15, 2020 11:17 am I can see that the air filter etc would be time consuming to refabricate. I have no objections with a single throttle plenum EFI manifold with port injectors. That’s what I got!

I was more commenting on the EFI university Holley sniper system that has eight throttles but looks like a plenum manifold with throttle body injection.
Yes, the EFI University sniper is pretty killer.

I flowed the stock air lid before/after.

Stock form with and without filters like 725cfm

Reworked with and without filters like 1280cfm

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