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  #1  
Old 09-02-2019, 09:49 AM
unclbuk unclbuk is offline
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Location: Cincinnati, OH
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FITech Street 400 Hard Starting

Has anyone installed a FITech Street 400 system on a stock AMC 360 V8? Mine was recently installed by a shop with a good reputation. I am able to start it when cold, but once warmed up, it is really hard to start. Cranks over and almost catches, but won't fire up.

My Prime Fuel Mult is set at 259.
Crank Fuel 20F is set at 0.8
Crank Fuel 65F is set at -21.1
Crank Fuel 170F is set at -40.6

Has anyone had success with different settings on a stock 360?
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  #2  
Old 09-11-2019, 09:46 AM
unclbuk unclbuk is offline
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Wow - 60 views and no responses...guess I'll keep tinkering with the settings.
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  #3  
Old 09-12-2019, 06:18 PM
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acct21 acct21 is offline
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Sorry -- this forum is getting less and less traffic by the day. Sad result of the "instant satisfaction" people get from posting on social media forums. Only problem with that is there is no way to archive -- or really search -- for the information. So the same questions get asked over and over.

Not much experience here on the forum with the Fitech from what I've seen through the years -- mainly guys with GM TBI, Howell, and Holley.

Problems with warm starts may be timing related. What is your base timing?
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  #4  
Old 09-16-2019, 07:37 AM
unclbuk unclbuk is offline
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Well, thanks for the reply! Interesting observation on the reason for less traffic on the forum. I don't use social media, so I'll have to keep resorting to other ways to learn!


My mechanic said Fitech is owned by Holley, but I have no way to confirm that.


Anyway, we've tinkered with the settings and the car is getting easier to start.
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  #5  
Old 09-16-2019, 09:52 AM
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UnkleMunky UnkleMunky is offline
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I think the mention that there was limited experience with FiTech on here is spot on. I have no knowledge about their products really, so couldn't be of any help to you directly. And gather many others are in the same boat.

Have you tried contacting the company directly? It looks like this is their website:

https://fitechefi.com/

Other than continuing to tinker as you are, and probably searching elsewhere online for suggestions, that is probably going to be your best help. Feel free to post back when you get things working better as it could help others down the line.

What do you think of the system otherwise? They seem to have a lot of options on their site and I couldn't see an easy way to narrow down choices to what might be needed for a FSJ. Why did you go with the Street 400 over any of their other options?
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  #6  
Old 09-16-2019, 09:33 PM
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Full Size Jeeper Full Size Jeeper is online now
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No harm in asking here, but you will have better luck at Fitech forums. I have the Holley Sniper and have used Holley Sniper forums. Good luck.
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  #7  
Old 09-17-2019, 02:19 PM
unclbuk unclbuk is offline
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I had the system installed by a local performance tuning shop. They recommended the Fitech system and I followed their advice. As it turns out, they were ill-prepared to "dial in" the system properly.


I did contact Fitech's tech support. After a couple of days waiting, they basically told me to keep tinkering with the settings.



I took it to a shop I trust and they have been working on the settings. It's hardest to start after the car is completely warmed up, shut off, and a re-start is attempted shortly thereafter. I have it back there now to fix the A/C. They will continue to tinker with it.


Once it's started, it runs beautifully. That alone is encouragement to keep trying to get the start up settings right. Once we have it dialed in, I'll post the settings for the next brave soul who dares to go down this path.


Having said all this, I am really enjoying this car. One of my big concerns is the people who are following me taking photos of it while they drive!



Thanks for the feedback!
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  #8  
Old 09-19-2019, 09:27 PM
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Crankyolman Crankyolman is offline
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I have the Fitech 2 barrel on my '72 J4500. It's off getting body work right now so can't look at what I have the fuel set to. It has a 360 that was rebuilt to stock and I have never had problems starting it, although it doesn't start as fast as it did with a carburetor.



I've found this website very helpful
https://www.fitechefituning.com/


but it's one of those things you have to play with, at least warm starts can be done multiple times a day, dialing in the cold start is a pain. I should have my truck back next week and should be able to give you the exact numbers but I don't think it was ever hard to start warm even with the factory settings.
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  #9  
Old 09-20-2019, 05:07 PM
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Unfortunate to hear -- since one of the benefits should be instant starts. Has to be an issue with fueling settings during start, or again possibly a timing issue. Shouldn't be having issues with fuel delivery itself... but what are you using for fuel pump, etc?
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  #10  
Old 10-20-2019, 08:20 PM
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R69US R69US is offline
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Quote:
Originally Posted by unclbuk
Has anyone installed a FITech Street 400 system on a stock AMC 360 V8? Mine was recently installed by a shop with a good reputation. I am able to start it when cold, but once warmed up, it is really hard to start. Cranks over and almost catches, but won't fire up.

My Prime Fuel Mult is set at 259.
Crank Fuel 20F is set at 0.8
Crank Fuel 65F is set at -21.1
Crank Fuel 170F is set at -40.6

Has anyone had success with different settings on a stock 360?

I'm running FiTech on my SBC 350...shouldn't be all that different. Those crank fuel numbers seem way off...I have mine all around 0. The multipliers are adjusted off of a zero 'base' number, and yours seem pretty far off, telling me it's not maybe not getting enough cranking fuel.
-A couple of things...does the screen stay lit while cranking? If not, you may have the white wire to the FiTech losing power during crank (common mistake during install that I also made, makes it tough to start).
-Depending on when you got yours, the temp sensors that came with the unit read pretty low...if you're handheld is reading less than I think 170 or so it won't get into the learn mode. The correct sensor is ACDelco 213-928.
This cleaned up a lot of issues on mine, including an annoying off-idle stumble that I was previously unable to get rid of.

You should definitely hop over to the fitech tuning forum. Lots of good info there.

But to re-cap:
-Verify timing
-Make sure the unit isn't dropping power during crank
-Make sure you have the correct temp sensor
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  #11  
Old 10-20-2019, 08:25 PM
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R69US R69US is offline
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As I read your initial post again, I'd say definitely look at that white wire source power. What I (and lots of others) did wrong was tie that into a keyed ignition source that drops voltage when the key moves to "crank" position. It tends to start cold because the system gets a good prime when it's cold, will catch and start, then once you're no longer cranking it the voltage comes back and it stays running.
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  #12  
Old 10-21-2019, 11:31 PM
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Crankyolman Crankyolman is offline
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Quote:
Originally Posted by R69US
I'm running FiTech on my SBC 350...shouldn't be all that different.


You might think that but in reality they are significantly different engines. Fitech designed their system around the small block Chevy so those settings wound have been designed to essentially be set at 0 for that engine but requires a lot of tinkering to get it dialed in on a different engine.
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  #13  
Old 10-21-2019, 11:45 PM
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Crankyolman Crankyolman is offline
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unclbuk, I finally got my truck back and just went out and checked the settings I have.


My settings are


Prime fuel multi is -20
Crank Fuel 20F is set at 97.7
Crank Fuel 65F is set at 97.7
Crank Fuel 170F is set at 68.8


I think what I did was start at the factory settings then adjust the crank fuel up and down which made little difference so I began turning the prime fuel multi off completely then began turning the others up until I saw improvement. eventually I had the crank fuels maxed out so I then began dialing the prime fuel multi back up until I got the best results for cold and hot starts alike.



I will say it still doesn't start as quickly as it did with half a pump with the carb but it is much better than it did with the factory settings.


It might be worth noting that I live where summer mornings are usually in the 50s or 60s and winter seldom gets below 20f and when it gets below 35f I have an oil pan heater to keep my oil warm.
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