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Messages - CV355

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1
FE Technical Forum / Re: Break-in Oil Question
« on: April 04, 2025, 01:41:33 PM »
Quote from: jayb on April 04, 2025, 07:30:34 AM
I always use 10W-30 VR-1 with new motors, and have had good results with that.  Since your engine is broken in synthetics would be OK, but there are a lot of reports of oil leaks developing after the installation of synthetic oils.  The sealing systems used on an FE are not as good as those on modern engines, and that may be why there are these leak reports. 

I appreciate it, I'll give that a try this weekend.  I had a feeling it had to do with leaks and sealing methods in an older engine platform, even with modern machining and componentry.  A lot of people are swearing by 20w50 on FEs but I generally try to avoid going that heavy on anything but my tractor.

2
FE Technical Forum / Break-in Oil Question
« on: April 04, 2025, 07:17:19 AM »
I searched through old threads and found some good info, but I don't know if it applies to my situation.

My 484 FE has been running since October 2021 and I have put a whopping 445 miles on it.  I have changed the break-in oil annually (Maxima Break-in 10w30) and it comes out clean (gee, I wonder why).  On other new or rebuilt modern engines, I'd run break in oil until 500mi and then switch to synthetic.  I was warned against doing this on an FE but not told why.  What should do I do for a roller FE?  I'm seeing a lot of people recommend VR1 but the range of weights is all over the map.  Any recommendations?   

3
FE Technical Forum / Re: Slow start, fuel drainback?
« on: January 08, 2025, 07:28:28 AM »
Quote from: 66FAIRLANE on January 07, 2025, 03:39:54 PM
Are you referring to starting after sitting for a few weeks, a few days or a few hours? Do you have a fuel pressure gauge near the Sniper? If so you can see how long it takes to build pressure when you prime under these various conditions.
"If I allow the fuel pump to prime for 3 seconds and load up (audibly) by leaving the key on "run/on" prior to attempting to start" This what you should be doing, especially when cold, so as to allow it time to provide the Prime shot. There is the odd occasion (very cold) when I will deliver two Prime shots.
Yours sounds very similar to mine and I have zero drain back issues (separate surge tank). After sitting for a few days I think its just the combination of fuel vapours depleted from the inlet tract, the fact that the prime shot has to drip around the edges of the butterfly and longish runners compared to a smallblock.


That makes sense, I figured that might be the case.

Typically, weeks.  According to Holley, the prime shot happens at the first crank trigger through the Dual-sync, so if I have no fuel pressure then there's no prime shot. 

I try not to let the engine go a month without firing and warming up.  Maybe I'll add in a bypass switch to the fuel pump relay so I can manually prime without involving the Holley unit. 

Hot starts are faster, but still not "nearly instant" like Holley is saying it should be. 

4
FE Technical Forum / Slow start, fuel drainback?
« on: January 07, 2025, 02:22:15 PM »
While my engine fires up consistently, it usually takes a few seconds from turning the key to successful ignition.  This is with a Holley Super Sniper EFI, electric fuel pump, -10AN supply, and regulator on the -8AN return.  I do not have a check valve anywhere in the fuel lines, and I notice that the fuel pump doesn't load up for a few seconds so it's probably priming free-flow before it builds pressure, hence the delay in ignition.

If I allow the fuel pump to prime for 3 seconds and load up (audibly) by leaving the key on "run/on" prior to attempting to start, it fires up quicker but still takes a second or two.  Holley says starting should be nearly instant and no dwell is necessary.

Is that a typical issue?  Should I have put a check valve up by the Holley unit to prevent drainback?

5
FE Technical Forum / Re: Holley Sniper - IAC Rampdown and RPM
« on: July 10, 2024, 07:38:29 AM »
Quote from: 66FAIRLANE on July 10, 2024, 12:33:42 AM
Is that Billet specialties PCV variable like a factory unit? One of the things I did was to replace the factory style with a fixed orifice one. Considering the IAC is a variable vacuum leak (albeit computer controlled) I did not like the idea of another less controlled one complicating matters at idle. From memory I think I am using around a .080 orifice.

I believe it is fixed, but I will check.

6
FE Technical Forum / Re: Holley Sniper - IAC Rampdown and RPM
« on: July 09, 2024, 06:47:51 AM »
Quote from: 66FAIRLANE on July 08, 2024, 09:56:05 PM
Quote from: Katz427 on July 08, 2024, 08:24:16 AM
Talking to a in-law, who once worked for holley, his comment was check the secondaries,  they have a tendency to stick, just slightly open. He says it has been a problem, for a while.

I believe a lot of people with this issue just put an extra wind on the secondary spring.

Are you still running a factory PCV?

I can try that.  I did put an extra return spring and extension on the primary throttle linkage.  I may fab up a bracket to add another spring to the secondary shaft.  I don't mind a stiff gas pedal at all. 

As for the PCV, no, not factory.  I have a Billet Specialties PCV and breather cap, PCV running to a Moroso catch can.  Catch can runs to a 3/8" NPT vac manifold fed from the Sniper base.  I'm seeing about 12" vac at idle, maybe 22" of vac when coasting at no throttle. 

7
FE Technical Forum / Re: Holley Sniper - IAC Rampdown and RPM
« on: July 08, 2024, 09:24:02 AM »
Found this thread on that topic- wanted to link it here in case anyone else stumbles on this thread:

https://fepower.net/simplemachinesforum/index.php?topic=7595.0


8
FE Technical Forum / Re: Holley Sniper - IAC Rampdown and RPM
« on: July 08, 2024, 08:37:12 AM »
Quote from: Katz427 on July 08, 2024, 08:24:16 AM
Talking to a in-law, who once worked for holley, his comment was check the secondaries,  they have a tendency to stick, just slightly open. He says it has been a problem, for a while.

That would do it...  I may add a spring there to help draw them back so it isn't just the linkage - easy to test.  It would also explain why it only happens when at full operating temp. 

I appreciate the insight!!

9
FE Technical Forum / Re: Holley Sniper - IAC Rampdown and RPM
« on: July 08, 2024, 06:55:57 AM »
Quick update...  The issue came back after a few more drives.  The issue only occurs when the engine is up to temp, and I confirmed that IAC% is no longer the issue.  Previously, IAC would hang at 20% and the car would lightly accelerate with no weight on the throttle pedal.  Since correcting IAC parameters in this thread, that factor of the issue is gone.

Now, IAC is at 0% and the engine hangs from 1500-2000rpm depending on gear.  I could not get the engine to idle down and had to drive home 10 miles without touching the accelerator pedal. 

I'm trying to acquire a laptop so I can do some data-logging, but looking for ideas as this is not safe to drive.  I'm going to check the idle set screw again.  It idles fine when cold though, so I'm not sure that could be the issue.  Any ideas? 

1)  BOV is operating fine
2)  Extra spring on throttle return, confirmed it's not binding with heat
3)  IAC Parameters set properly
4)  No vac leaks- vac gauge was fine and matched TPS%


10
FE Technical Forum / Re: Holley Sniper - IAC Rampdown and RPM
« on: June 10, 2024, 06:54:35 AM »
I updated the settings as recommended above, and the issue is now completely resolved.  Zero RPM hang, IAC is operating properly, and the drive quality was far better.  Thanks guys!

11
Non-FE Discussion Forum / Re: Who are the current good guys where I can purchase a complete 9" center section?
« on: June 03, 2024, 07:21:17 AM »
I went with a full Moser M9, but they also cell just the center sections. 

12
FE Technical Forum / Re: current fuel injection options?
« on: May 31, 2024, 08:15:18 AM »
I'm running a Super Sniper (8 inj) in a blow-through setup.  Part of me wanted to go port injection and run Terminator X, but the Sniper has been decent.  The only issues I've encountered were due to my own lack of experience with tuning. 

I have read that the newer Sniper units have better RFI shielding (mine was an earlier model), otherwise you can get inexpensive faraday cloth and line the ECU cavity in the throttle body casting and the cover.  I also ran shielding over all I/O cables, and loomed the spark plug wires cleanly and away from the TB.  I haven't had a single issue with RFI/EMI. 

For fuel economy, I'm getting about 7mpg average, maybe 9-10mpg on the highway at 62mph.  That's with 484ci and a blower. 

One major advantage that TBI has versus port injection is air charge cooling effect for blow-thru applications.  The IATs are almost cut in half with TBI or carb setups (time + latent heat transfer for vaporization).  No intercooler was needed.  If I was running port injection, I'd have a large air/water intercooler.

After I bought the Sniper unit, but before I had it installed and running, I saw a lot of negative comments about it online.  I was nervous about it thinking I had made a mistake, but the majority of the issues stem from people not knowing how to properly set up and tune it (myself included, I'll admit that), and people who incorrectly installed/wired it and peripherals (thankfully not my issue).  The more time I spend on the Holley forums, the more I'm seeing that.  Can't blame the product if the end user is making the mistake... 

13
FE Technical Forum / Re: Holley Sniper - IAC Rampdown and RPM
« on: May 29, 2024, 06:59:01 AM »
Quote from: My427stang on May 28, 2024, 09:38:58 PM
IAC Hold is where the IAC parks once you give it throttle, if it's too high it won't idle down easily

Ramp Decay is the time it takes to relax from the hold point once the throttle returns

RPM above idle is where it starts to settle

RPM above idle to start idle control is when the IAC takes over actively, not the ramp down

I think your idle speed to start ramp was high, and you went higher. That will essentially ease the idle starting at that point

However, logs are your friend, going to need to get that working again to really figure it out

I did test the idle speed to start ramp parameter down to 500 to see the effect (1325 total).  It resulted in an angry, erratic idle of about 1400rpms, like the engine was loading up to launch.  So, I changed it in the other direction to 1250 (2075 total) and it settled down immediately as IAC dropped to 0%-2%.  My idle is set at 825 in neutral, about 7xx in gear.  Any higher and it diesels at shut down.  Any lower and it shakes the car apart and feels like it's going to stall out at red lights.   

I agree, I need to get that laptop fixed so I can datalog.  Microsoft has been awful lately with pointless and damaging updates (practically every phone call I get on for work has someone mentioning how recent updates wreaked havoc, but I digress...)

What would the negative effect be if the idle speed to start ramp is set far too high? 


14
FE Technical Forum / Holley Sniper - IAC Rampdown and RPM
« on: May 28, 2024, 08:34:26 AM »
I've tried asking this over on the Holley forums but they won't touch the question unless I post datalogging results (can't do that at the moment, my laptop bricked during one of Microsoft's unnecessary hourly updates).  I'm hoping someone might be able to provide me with an explanation on effects of IAC settings:

IAC Hold Position
Ramp Decay Time
RPM Above Idle to Start Ramp
RPM Above Idle to Start Idle Control

https://www.manualslib.com/manual/1379721/Holley-550-407.html?page=48

These are self-explanatory in function, but my question is- what are the negative effects of having these parameters adjusted incorrectly?  I am facing an intermittent RPM hanging and surging issue.  There were multiple factors to it (BOV adjustment and vac leak, needed stronger springs on the TB as it was sticking open at 5%, and AC kick was on for some reason), but I have solved a few and narrowed it down to just IAC tuning at this point.  If I let off the throttle with the engine up to temp, the IAC% hangs at the hold position and refuses to ramp down unless I blip the throttle (start ramp rpm issue, right?).  Really fun when you're approaching a busy intersection and the engine is fighting the brakes.

I adjusted the IAC hold from 20% down to 10%, Ramp from 4s to 2s, and RPM start ramp from 1000 to 1250.  This reduced the issue but didn't solve it.  I've been told that the RPM start ramp needs to be higher, but I don't fully understand what will occur if this is set too high or other values too aggressive.  The rampdown itself makes sense- too aggressive and it'll make decel jerky, too gentle and RPMs hang.  I don't want to overcompensate for one issue and create new issues.

15
Non-FE Discussion Forum / Re: Wifes nephew
« on: May 20, 2024, 10:59:22 AM »
Definitely have to keep the passion alive with the younger crowd.  My son is 8 months old (we had him a bit later in life than most, no regrets) and he absolutely loves loud noises.  If I fire up the Mach 1, or the straight-piped Coyote truck, tractor, chain saw, etc, he goes wild with excitement.  He also goes nuts if I flip on one of the guitar amplifiers, so I'm not allowed to do that if it's too close to his naps or bedtime. 

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