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Discussion Starter #1
Holley Terminator or Sniper EFI Setups on NA 347 / 363's

Hey Guys,

Wanted to see if anyone is running a Holley Terminator EFI or Sniper EFI setup on a high RPM (up to 7500) NA 347 or 363 with carb intake manifold and what your experience with the system has been. I am currently looking to put a Holley Terminator Stealth 550-442 P.N. in place of my 950HP holley carb. I have read the driveability is very good, but does anyone have before and after dyno results on setups making 550 HP or more. Haven't seen many posts on the Mustang Forums of guys making this switch on hot strokers so wanted to see what people have done or are seeing on the track and street. Any feedback is welcome.


Thanks,
 

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On a 500 hp 408 Chrysler...... Hot Rod saw a 3 hp difference (loss). 500 versus 503 at the crank. Overall the change was an average loss of just over a single foot-pound and just under 2 hp. But with notable gains in the mid-range. I Excelled the dyno report to get those numbers. I also found the average percentage change was roughly -0.3%. WAY within any margin of testing error used in the industry. I'd say it was a wash. But it probably starts better and runs better and cleaner with the EFI. At this small variance I'd say it boils down to personal preference.

Personally I would not fret losing 3 hp at 5800 rpm and I would welcome the 10-15 ft-lb gains at 3500-4000 rpm. I would use those lower rpm gains much more often than the top end gain. In a racing situation the differences would be erased by driver ability and car setup and weather factors and a host of other variables.

Do you want to tinker with jetting or do you want to turn the key and drive? Are you racing at a highly competitive level? or just for fun? Those are rhetorical, BTW.

I'd also be interested in actual first hand results from the Ford world.
 

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Holley dodges e85 questions like crazy. Why would they release stuff like this without verifying it with one of the most popular fuels?
 

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e85 is basically a dead fuel in my region. Used to be available at a dozen local pumps. It's like two or three at most now. Non-ethanol is the growing fuel around my neck of the woods. I think e85 will become like race fuel. Only a couple places have it. It'll become a pain to get and use reliably and people will shift away from it. May be a different story in the mid-West.

They probably see the masses trending away from that fuel.
 

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e85 is basically a dead fuel in my region. Used to be available at a dozen local pumps. It's like two or three at most now. Non-ethanol is the growing fuel around my neck of the woods. I think e85 will become like race fuel. Only a couple places have it. It'll become a pain to get and use reliably and people will shift away from it. May be a different story in the mid-West.

They probably see the masses trending away from that fuel.
E85 is dying out here as well. Many guys are ordering it by the barrel for convenience.
AZ has some of the crappiest gas known to man. It's sourced from CA. I couldn't believe it when I last visited NY and my mother was able to pull her Harley up to a non ethanol pump. You guys have high fuel tax but what I wouldn't give for 93 octane, non ethanol fuel.
 

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Discussion Starter #8
Hey Woody,

Just looking to tinker less with the carb to keep the car is perfect tune year round. The engine drives great with the carb and is an absolute blast to drive on the street, but I have the usual issues with the carb. Gas smell in garage after parking, cold start with no choke takes some foot feed to keep in running for 30-60 seconds when cold, fuel varnish issues occasionally, running the AC requires turning up the idle a bit in summer, and some occasional hot start issues at the track / hot days. Overall the carb issues are no big deal, but all the hotrod / cruiser guys I have talked to running these Holley systems on mild V8's say you will drive the car so much more after installing it. They say it is get in an go with no hassles after install and cures all the issues above and drives / throttles fantastic on the street. I just don't want to loose any noticeable power in getting these benefits. . . . .

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Hey Woody,

Just looking to tinker less with the carb to keep the car is perfect tune year round. The engine drives great with the carb and is an absolute blast to drive on the street, but I have the usual issues with the carb. Gas smell in garage after parking, cold start with no choke takes some foot feed to keep in running for 30-60 seconds when cold, fuel varnish issues occasionally, running the AC requires turning up the idle a bit in summer, and some occasional hot start issues at the track / hot days. Overall the carb issues are no big deal, but all the hotrod / cruiser guys I have talked to running these Holley systems on mild V8's say you will drive the car so much more after installing it. They say it is get in an go with no hassles after install and cures all the issues above and drives / throttles fantastic on the street. I just don't want to loose any noticeable power in getting these benefits. . . . .

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I dont see a loss of power in the equation
 

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Discussion Starter #11
Ya I am planning to fine tune it on the dyno after install. I only expect the self learning to give me a decent baseline and then adjust from there for optimal performance. I like the forum they have setup and how its broke out by EFI system as well, in that when you have issues there are 100's of people using the same EFI system to help you troubleshoot and fix problems fairly quickly.

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Discussion Starter #12
Anybody running these Holley Sniper or Terminator EFI systems on 347 / 363 / 408's over 550 HP street or track? let me know your experience thus far.
 

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Did you ever make a switch? I'm getting ready to switch my 342 to a Super Sniper 650 , vic jr , in preparation for a 363 in the future. Not quite with your aspirations, but making max power around 6500 sounds good.

Anyone with any experience yet?
 

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Discussion Starter #14
Well I am in the process of installing the 550-442 Terminator Stealth Kit. So far I am very impressed with the product after unboxing everything. I am going to be running this with the Dakota Digital gauges and found out the two products with the right adapters and interface items work very slick together with some careful setup. I will update once I get it running this spring.

I will post some after install dyno results as well since I have not seen anyone running this on a high rpm stroker, but I expect to pick up some power as this throttle body flows 950 cfm roughly 120 cfm more than my current carb setup.
 

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Discussion Starter #17
Main reason for the Terminator over the Sniper is the ability to run with the Dominator ECU which has alot of expandability and additional options for the future. Second reason is the look, Terminator Stealth looks just like a 4150, which is what I wanted since this is a show car primarily. The Throttle Body on the Terminator is also 950 cfm vs 800 cfm on the Sniper kit as well. So far the kit is well engineered and looks great on the car and isn't too bad to install. Should fire it up in a few weeks. The average person won't know its EFI unless they look close.

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Discussion Starter #18
Hey Guys,

Got the car fired and I have to say I am impressed with the Holley System. People will really have to look hard to not think this is a 4150. Only idled the car and rev’d it in the garage for about 20 minutes, but man I like it so far. Within 1 minute the EFI had the car running smooth and on the correct Air Fuel setting, no stalling or anything on the initial fire up. Throttle response is so crisp now, after just 20 minutes of learning, and will idle much lower than with the carb. AC on / off and electric fan on /off doesn’t phase the idle RPM setpoint. Can’t wait to drive it, should have some driving reports in a week or so.

And the best part the car did not stink up the garage that night, no fuel smell in the morning.
 

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Congrats on the first start up.
I put a Sniper on my 302 with mild cam.
I was curious how the idle would be compared to my carb. I'm happy with the result.
I have a open plenum Vic jr. intake and got the low air sucking noise while driving. I put on a 4 hole spacer as suggested and it is fine now. The car drives better with the Sniper than the carb. It has much better throttle response and drives great. The Holley Sniper forum has been great for general tuning help.
Keep us posted on your tuning with it.
 

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I wanted to go with one of these systems for my 427 stroker combo but i just dont understand why holley makes the sniper to support 650hp with 4 100lb fuel injectors and 800cfm throttle body but the terminator only comes with the smaller 80lb injectors but 950cfm throttle body and only rated to 600hp i dont know seems a liitle strange to me.i dont think my engine is making 600hp but it might be close and was afraid of maxing the injector out to much at wide open throttle. I dont know anyone have the holley terminator on a 427ci combo?
 
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