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Old 05-15-2022, 07:39 AM
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Default holley terminator x

Any guys running this in high hp applications yet? what pump? dual synch distributor is good, no crank trigger anymore?

what did holley change from the 565-107 to the 565-207

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Old 05-15-2022, 09:14 AM
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What exactly as far as higher HP applications?

Are you talking about the throttle body size and what holley says they are rated for?

I talked back and forth with Holley a few years ago and found the 650hp limiting factor for the 4150 stuff was the 4 smallish 100lbs per hour injectors. They came out with the terminator X shortly after with 4 120 pounders to fill the void, but already had an 8 injector 4150 Stealth unit that would do the job. After they wouldn't install 4 120 pounders in the stealth unit they tried to talk me into a Terminator X. I wanted a Stealth 4150.

I went against the grain and did the 8 injector 4150 stealth unit and showed they support the higher HP just fine. The car has already went 3 mph faster than it's ever been before when using the 4150 950HP carburator on an engine that made 724hp. So those 4150 Stealths certainly can support more power than Holley states, if you buy the 8 injector unit. No need for the fancy X or the 4500 style, unless that's just what you want.

Not sure how many people here can give an experienced opinion that go for the Terminator X with the 4 120 lbs injectors since there are very few people here that even push 500hp, and probably count on one hand anyone in the 600hp range. A standard Sniper would support any of that crowd.

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Old 05-15-2022, 04:14 PM
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540 cubes 15;1
900 PLUS HP

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Old 05-15-2022, 06:46 PM
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I assume you run a 4500 style carb on that one?

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Old 05-16-2022, 10:37 AM
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The Terminator 4150 throttle body likely will not flow enough physical air for a 540 cubic inch engine. Typically without modification they flow in the 830 cfm range. You can get them to around 900cfm if you bevel the lower throttle bores, knife edge the butterflies and go to countersunk set screws on the butterfly shafts. I think you would be looking at the Sniper Stealth 4500.

There is also the new offering from FiTech that is making it's way to market, called the Nemesis. https://www.subscribepage.com/fitech-nemesis-pre-order

4500 flange, 1600hp capable and designed specifically for large cid engines.

https://www.enginelabs.com/news/sema...o-big-engines/

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Old 05-16-2022, 11:03 AM
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It's the 900+ horsepower that would have me looking at the 4500 flange.

I do know the 4150 can feed some decent HP and large CI engines, more so than Holley claims.

We were finally able to hit the track with the EFI on dad's car to show something I've been saying for months. Dad's 571 ci that dyno'd with a 4150 950HP carb that actually flows 870 cfm. It made 724 hp.

Best MPH with the carb was 124.

Now with the Sniper Stealth 4150 installed best MPH was 128. A big difference for something that is supposed to flow less than the 950HP we took off. I don't buy those Holley flow numbers on the EFI stuff considering the bores are bigger and the blades are bigger than the carb we pulled off, plus there are no boosters in the way. The MPH difference bears this out.

There were many other reasons we stuck with the 4150 on this application that are too long to explain, but it shows they do work on a decent HP application, as long as you have enough injector.

I do agree though, with 900 or more HP, I'd rather use a 4500, especially if you have already dyno'd the engine with a 4500 carb and have the intake for it.

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Old 05-16-2022, 02:18 PM
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Putting this together with Term X stealth 4500. 8-100lb/hr injectors. 535CI tiger. Using the 535 lph Walbro in tank pump. Major difference between Terminator and Dominator computers are number of ins and outs. This has 4 ins and 4 outs you can program. I had a 1200PA from Fitech and i like the holley a lot better for how detailed the maps are. i think snipers are more like fitech. Easier to setup but not as tunable.
Haven't run it yet.
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Old 05-16-2022, 02:50 PM
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We run the 4150 Super Sniper Stealths with the 8 100 lbs. injectors.
The supers have extra inputs and outputs, I think 3 or 4, so they are basically set up electronically like the X and are fully tuneable with detailed maps.

I think as far as software goes, these Supers were the predecessor to the X platform with the only visual difference I've seen being the computer is in the Sniper unit rather than a seperate box.

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Old 05-19-2022, 07:02 AM
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i have the components on the way holley 12-1800 pump, term x 550-1070, and msd 2384 distributor. ill up date in few weeks hopefully

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Old 05-19-2022, 09:42 AM
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If you still run a timing chain, the crank trigger is worthwhile.

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