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Messages - 2VNTG68S

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1
FE Technical Forum / Re: Thought I blew my engine today!
« on: November 17, 2017, 09:03:24 AM »
Guessing it started working loose on the Chassis dyno pulls I just did.  Surprised it didn't pop then...

2
FE Technical Forum / Re: Thought I blew my engine today!
« on: November 15, 2017, 08:01:46 PM »
Yeah, it was one of the screws on the rotor.  Brand new FAST dual-sync. Didn’t think to check it. Will definitely be putting some loctite on.

3
FE Technical Forum / Thought I blew my engine today!
« on: November 15, 2017, 04:17:52 PM »
Brand new 445 stroker built by BarryR @ Survival.  Came down an off-ramp, stepped into 3rd and BANG!  Massive backfire.

Thought the motor was toast.

Found the back of the distributor cap blown off and the rotor hanging off sideways.  Not sure if anyone else is running the FAST Dual-Sync but I would check the screws on the rotor regularly (new addition to my pre-flight checklist).

4
FE Technical Forum / Re: Chassis Dyno- eye opening!
« on: October 31, 2017, 10:00:11 AM »
Drive it.

Drive it everywhere, take the kids to boy scouts.  Drive 50 miles in one direction and 50 miles back, try to improve fuel economy while not losing any power.  Get it really stupidly hot racing around then sit at a redlight for 2 minutes.  Go off into the country roads and tear them up and then pull into a gas station and park the car while the fuel boils and try to restart the engine.
Drive it 40 miles to the drag strip and get really horrible times because you have street tires and probably 500ft lbs of torque, then drive it home.
Let the car idle for 30 minutes as see how hot it gets on the hottest day.
Anytime a little issue pops up, fix it.

That's how I do it :P
This is what I've been trying to do.  The chassis dyno helped with most aspects of the tune but now I'm playing around with cold start, warm start, seeing how it responds to different cruising parameters etc...  From my perspective the initial dyno tune at Barry's was a great baseline to make sure we were in the ballpark.  The chassis tune got me closer with all the variables of exhaust, intake restrictions, etc...  I feel that WOT is about as good as it will get.  Now I feel I'm 90% there and just filling in around the edges.

5
FE Technical Forum / Re: Chassis Dyno- eye opening!
« on: October 30, 2017, 02:34:14 PM »
I can't take my car on the strip unfortunately (convertible and I don't want to put in a roll bar).  My ass-o-meter guess is that it would do low 12's.  Even though the chassis dyno numbers were a surprise it pulls plenty hard.

6
FE Technical Forum / Re: Chassis Dyno- eye opening!
« on: October 29, 2017, 02:57:42 PM »
I bet the heat in the cramped mustang engine compartment steal a few horses to
this is the other reason I like the 67 Shelby hood - heat extractors.

7
FE Technical Forum / Re: Chassis Dyno- eye opening!
« on: October 29, 2017, 07:41:18 AM »
Quote
Was your hood open or closed when you were on the dyno?

It was closed but he had a huge floorstanding fan blowing at the Rad

I was thinking that since the HP impact was higher than the Torque impact it indicates a breathing restriction. My guess was the 2.5” exhaust.

8
FE Technical Forum / Re: Chassis Dyno- eye opening!
« on: October 28, 2017, 07:43:50 PM »
20% is what we usually allow so 23% is well within reason.
I was hoping to be on the low end of that scale, lol

9
FE Technical Forum / Re: Chassis Dyno- eye opening!
« on: October 28, 2017, 02:11:09 PM »
Thanks guys - that’s helpful context.

I was considering going to 67 Shelby short nose hood (it’s a 68 Mustang vert) with a custom fiberglass air cleaner seal. Worth it to give it a straighter shot at the outside air?



10
FE Technical Forum / Chassis Dyno- eye opening!
« on: October 28, 2017, 01:54:06 PM »
445 stroker built by Barry R. 495 Hp / 545 ft-lbs on Barry’s engine dyno

Best we could do on the chassis dyno was 365 Hp / 442 ft-lbs

I was shocked but the chassis tuner was not the least bit surprised.

Do those numbers indicate a breathing problem? Wondering if 2.5” exhaust was a huge compromise

Other factors:
Vintage Air
Power Steering
FPA headers
TKO 600
9” 3.70 Tru-Trac
Aluminum driveshaft.

11
FE Technical Forum / Re: Need help building my A/F and Spark Tables
« on: September 26, 2017, 09:14:17 PM »
Playing around today and she gave me a little "rattle" when I dropped the hammer in 3rd gear at 2500.  So the spark advance must be too fast?

Confusing because I don't have any more spark in it than Barry did when he ran it on the dyno.  So must be something else, which raises a couple of questions:

1. how much does temp affect it?  I have a 195F thermostat in it now.  Should I back that off to a 180?  (I thought EFI wanted to run hot typically)
2. Air temp was really high (for Toronto in Sept - it was in the 90's with high humidity)
3. A/F ratio.  Does a leaner mixture promote more detonation at a given spark level?  If I fatten the mixture would it be a little happier?

Thanks in advance guys - steep learning curve over here!

12
FE Technical Forum / Re: Need help building my A/F and Spark Tables
« on: September 25, 2017, 08:26:46 PM »
Thanks Jay!  Definitely will help to see where it is on the graph while driving and play around in real-time - I'll give that a shot. 

Any thoughts on the A/F numbers? I feel like I could lean it out a bit at low loads and idle, but not sure how to tell if I'm going the right direction or not...

WOT Barry set on the dyno and it was rock solid so I won't mess with that - its more around the transitions and cruise / idle I want to optimize.

Attached the latest set of Spark and A/F tables after some playing around

13
FE Technical Forum / Re: Need help building my A/F and Spark Tables
« on: September 25, 2017, 07:02:04 PM »
Runs pretty good.  I haven't been pushing it much though.

I'll run a log tomorrow and post it.

Its a stick car (TKO 600 5 speed).

What I'm trying to figure out is how fast my timing curve should be at different loads and RPM's, and what the appropriate A/F ratios are for different conditions.  So its not that its not running well (it is) but I'm not sure if there is some more optimization I can do to increase mileage and responsiveness under all driving conditions.   

14
FE Technical Forum / Need help building my A/F and Spark Tables
« on: September 23, 2017, 06:25:48 PM »
Hey guys,

Hoping I can get another set of eyes on my FAST A/F targets and Spark table

Relevant specs (let me know if I missed anyting):

445 stroker (built by Barry at Survival)
(ported) Edelbrock Performer RPM top end
Fast XFI Sportsman EFI system
Fast Dual Sync Distributor
Cam specs: only known to Barry ;)
Dyno'd at 495 hp and 541 ft. lbs.
TKO 600 with .64 OD
9" with 3.70's

I know cam specs are important but guessing that a ~500 hp 445 stroker would have a reasonably narrow range for A/F and spark?

Also, I know V/E table is critical but I will tune (and/or let the ECU tune) the base V/E tables to minimize O2 correction factors but need the right A/F targets to start with.

Attached are the current spark and A/F tables.  The top of the tables were tuned by Barry during the dyno pulls so I think those are pretty close.  Looking more at the cruise ranges and spark table transitions.

Definitely an EFI newbie so look forward to any guidance you guys can provide!

Thank guys!

15
FE Technical Forum / Re: Best starter for 68' 390 Mustang with FPA headers?
« on: September 01, 2016, 08:30:59 AM »
I just put an XS starter in my '68 390 GT after the FPA headers cooked the original (factory) one.  Go mini for sure (my $0.02)

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