Carb style fuel injection

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Sandfreek

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Figured there’s lots of people here with classic cars. Going to put fuel injection on my 66 Chevy truck with a GM crate engine. Can’t remember which model but it’s a mild engine with cast heads. Anyway, which brand have you used with success? Leaning toward Holley sniper but have been looking at the Fitech stuff too. 

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Our shop does this on a daily basis. Stay away from the sniper. Either the Terminator or dominator Holley system depending on what transmission you have. You will also have to do an in-tank fuel pump in a fuel system.

 
onanysunday said:
Our shop does this on a daily basis. Stay away from the sniper. Either the Terminator or dominator Holley system depending on what transmission you have. You will also have to do an in-tank fuel pump in a fuel system.
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I take it too much lift for an external pump with stock tanks? 

 
onanysunday said:
Our shop does this on a daily basis. Stay away from the sniper. Either the Terminator or dominator Holley system depending on what transmission you have. You will also have to do an in-tank fuel pump in a fuel system.
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I agree. Stay away from sniper. I put one on a Pantera and had the ecu ho bad on day one. One of the injectors was just pouring fuel out. Sent it back and only got a rebuilt one back. It had issues then the third one worked ok. I wasn’t impressed

 
the holley sniper stealth that looks like a carb has worked great on a nova i worked on. the regular sniper (the chepaest one) is troublesome. one issue with it is the ecu is built into the throttle body and that causes a ton of issues from electrical noise inside the engine bay.  for that reason on my k5 blazer  im planning on using the terminator stealth unit on the new 406 im building for it. personally i dont feel fitech is even an option worth exploring these days. youll find much more support and knowledge from shops/people on the holley efi setups than any other.

 
IMO  if you want a "carb replacement" you have a lot of choices - Most of them bad.

From FAST,  Edelbrock, Quickfuel, FiTech and bunch of chinese copies like Summit and Jegs etc.  And of course Holley

I have played with all of them.  earlier on FAST was my go to , I did a few FiTech and they work but not well - I settled on Holley

The hardware is almost same on all of them, the SW is the differentiator and thats what you should look at

Right now I would go Holley 100%  I just finished a couple Snipers and have one going on now 

The stealth looks like a Holley Double Pumper and Sniper regular Looks a bit  like a Carter Thermoquad Carb

Internally they are the same. 

If you can afford to spend the time and $$ then port EFI is awesome - that would be the TERM X -  but on anything but and LS 

Its not a day job.

Back to carb-style EFI

The Lower HP Snipers had some Injector problems early on - and maybe still do I don't  do them 

But the higher HP model (good on anything over 250HP)  is great and so is the Higher HP stealth since they are the same

For me  they have been great (different injectors and faster drivers)

The SW is essentially the same as the TermX and in fact I tune them the same way, but on an NA engine, by following some really easy

Steps you can get the base wizard tune to self learn  and with a bit of driving and tweaking it will run better any carb from  a standpoint  of clean running  and no stumbling

better cold start and just smoother.  But Like everything their are best practices to follow.  You have to use really good suppression ignition wires and resistor spark plug, you  can't use  cheap summit and Jegs  optical distributor pick ups and most importantly you have to run the EFI power wires directly to the Battery if not  you will have lots of issues  - so you need to make that commit as well $$ and time.  I learned this through way too much learning.

If this was my first install I would go for the master kit  - this gives you a great in tank pump and a simplier proven one day install

It seems more expensive, but in the end it will save you money.

Because the Holley SW is  same as term you can get a Nice Dash - the Sniper  dash is cool and Cheap and you can get  many people to remote tune if you have 

issues.  As long as you follow the rules on the install  - like put the 02 in the right spot it will work well,   The cheaper EFIs use 

lower end 02 sensors and their placement is very critical for good operation

In the end though its worth it if you want the truck to drive really well 

 
Kevin said:
the holley sniper stealth that looks like a carb has worked great on a nova i worked on. the regular sniper (the chepaest one) is troublesome. one issue with it is the ecu is built into the throttle body and that causes a ton of issues from electrical noise inside the engine bay.  for that reason on my k5 blazer  im planning on using the terminator stealth unit on the new 406 im building for it. personally i dont feel fitech is even an option worth exploring these days. youll find much more support and knowledge from shops/people on the holley efi setups than any other.
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That was the one with the ecu inside the throttle body. No bueno

 
Stay away from Fitech, it’s worked for a lot of people, but I had a ton of issues with it before getting it dialed in. I put it on a 70 bronco with a 351w, super mild engine nothing crazy. I had the Fitech fuel pump seize on the freeway(Fitech guy told me “oh yeah that happens sometimes” and gave me a new one, had a Fitech fuel line burst in a parking lot, dumping gas everywhere right near the headers(Fitech told me they had a bad batch of fuel lines and this was common), and had two injectors go bad, filling my engine with fuel while it was parked, literally dripping from the exhaust collectors and had to get towed home. After those issues it’s been reliable and starts first try every time but I wish I went with Holley to begin with. I also find the idle hangs up a bit randomly. As far as setup goes it really is plug and play and is a definite upgrade over the carburetor. 

 
Thanks for all the great info. Is this the one you are talking about full throttle guy? Also what is SW you are talking about? 

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Sandfreek said:
Thanks for all the great info. Is this the one you are talking about full throttle guy? Also what is SW you are talking about? 

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yeah thats the one - they make it in Black,  silver and Holley gold color -

Same one Kevin used as well

I did the Black one on a 70 Chevelle 396  

Car was  a pig before with a Holley 850, guy went through two carbs  and paid to have them set up

But the car because it had a pretty big cam  and tight torque converter  would bleed your eyes at idle and 

never ran right, the Holley fixed that  I have not talked to the guy since he moved to Arizona  - I guess thats good

its probably still prefect

I should mention one Huge Mistake people make using TBI EFI -  you can not use a dual Plane manifold where the right and left sides are completely closed off or all four ports  from the carb are seperated

you will never get it running right - the sensors in the unit will screw up big time  - Easy fix most of the time --  You either need to change to a single plane or remove the separator down 1-2" (I pull the manifold and mill it down)  But you can cut it out carefully with aN ABRASIVE WHEEL - OFF THE CAR OBVIOUSLY   then wash it out good and put it back on

Does not affect performance once you move to EFI

 
Dylanshaffer said:
Stay away from Fitech, it’s worked for a lot of people, but I had a ton of issues with it before getting it dialed in. I put it on a 70 bronco with a 351w, super mild engine nothing crazy. I had the Fitech fuel pump seize on the freeway(Fitech guy told me “oh yeah that happens sometimes” and gave me a new one, had a Fitech fuel line burst in a parking lot, dumping gas everywhere right near the headers(Fitech told me they had a bad batch of fuel lines and this was common), and had two injectors go bad, filling my engine with fuel while it was parked, literally dripping from the exhaust collectors and had to get towed home. After those issues it’s been reliable and starts first try every time but I wish I went with Holley to begin with. I also find the idle hangs up a bit randomly. As far as setup goes it really is plug and play and is a definite upgrade over the carburetor. 
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Lots of bad FiTech stories out there v- never had that level of bad luck, but definitely not the best choice

 
Good info reading here. I have a boat and seen the snipers added with success and was considering a similar set up. 
 

will look into things further if I go this route. But issue on boat is 02 sensor locations some have figured it out but most don’t. I won’t do it til I can do perfectly. 

 
How about doing the Edelbrock muti port system or something similar?

 
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