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Author Topic:   Tune up advice needed
Fastymz
Moderator

Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 05-13-2003 04:36 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
For the 1st time since I've put the new cam and long tubes on.I checked my total timing.It's at 40 at 2500rpm,that seems alittle high to me.
With the vacuum disconected and pluged.I have [email protected] run 89 gas with out any pinging at all.I know the 4400 feet above sea level as something to do with that too.
What would guy set the total at?
I have [email protected] which is idle the car starts ok.Must the time when it's hot I have to give it alittle right after it starts or it will die?

My vacuum is at [email protected] and [email protected]
Nice steady needle reading too.

It was 76 degrees out today.I took along drive and it never got over 185 so far.

The pulls hard from above 3000rpm,and better then before below that too.But seems to be missing something below 3000rpm?

Sorry for the long post,you guys have any suggest for me?

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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Fastymz
Moderator

Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 05-13-2003 05:37 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Ok I did search and found that alot of run best at 34-36 total.I set my idle to 10 down from 14 and even tried 16,and now 36 in at 2500rpm.With vacuum hooked up.
And that helped alittle.The car seemed to start better.And idled real smooth,also some of the hesitation at 2000-3000rpm flooring from a rolling is gone.

From a stop it runs even harder then before.More tire spin then ever.I went back to look at the tire tracks.They had to be a good 20feet long or more.
I think I'm on the right track,but if any of you have advice I'm all ears.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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Tea'sGrabber
Gearhead

Posts: 276
From: Seattle, Wash.
Registered: Feb 2003

posted 05-13-2003 05:49 PM     Click Here to See the Profile for Tea'sGrabber   Click Here to Email Tea'sGrabber     Edit/Delete Message   Reply w/Quote
What are you running for a dist. ? Have you ever put it on a machine to find out what the advance curve is? So you have 36 total @ 2500? What do you have @ 5500??? Find someone who has a machine and have it curved. Find the sweet spot in your powerband and have the advance all in just before.If it's a MSD take the instruction book and sit down and read... All the curves are there and you change springs to tailor it to your engine....

------------------
Todd 71 Mav Grabber All orig 306 cu.in. Cast Iron heads. Carillo Rods.Best et. 10.71 @ 124 thru the mufflers.

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Fastymz
Moderator

Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 05-13-2003 05:54 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Todd stock points dist,rebuilt.With a pertronix II unit and coil.
I have never had it on a machine yet.
The guy in town that does it.Told me not to waste my money on my set up now.Wait until I go to the duraspark or MSD unit.
I advance lite is broke.So I can can only read it to 40 on the balancer.I know it goes to 40+ above 3500 rpm.
I dont even run my old 351w to 5500 rpm at the track.
The most I've had it to is 5400rpm once.
It ran it's best time shifting at 4800 rpm.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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steve'66
Gearhead

Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000

posted 05-13-2003 08:58 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Ron,

You should run 4-6 degrees more timing at your elevation. When I lived there I would brake stall the engine and advance the distributor until it pinged then back it off a touch. When we'd travel to sealevel we'd have to run better gas or plug the vac advance hose on street cars. On yours I'd set the timing to 40 degrees total and leave the vac hoses off. Mechanical advance only! Good luck,

SteveW

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Fastymz
Moderator

Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 05-14-2003 01:43 AM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Fastymz:

My vacuum is at [email protected] and [email protected]
Nice steady needle reading too.


What about this vacuum reading,is it good?
Seems alittle high to me.

------------------
SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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Tea'sGrabber
Gearhead

Posts: 276
From: Seattle, Wash.
Registered: Feb 2003

posted 05-14-2003 10:38 AM     Click Here to See the Profile for Tea'sGrabber   Click Here to Email Tea'sGrabber     Edit/Delete Message   Reply w/Quote
Don't waste the $ on this set up??? Well running 40+ total in the heat with the oxygenated summer fuels down there??? $50.00 seems a little cheaper than 3k for a new motor??? Just because you don't hear detonation doesn't mean it isn't happening... Sure makes it easier to tune/figure out problems if you have a baseline to start from? Buy the MSD and bypass the Duraspark... I personally don't like vacumn advance dist... Mechanical ones, like the MSD are so easy to tune yourself by just reading an advance chart and swapping springs... Tailor you curve, ie. how much advance and how fast you want it in by and your done... Stick a light on it above the curve and check your total and you're done!!!! my .02!!!!

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Todd 71 Mav Grabber All orig 306 cu.in. Cast Iron heads. Carillo Rods.Best et. 10.71 @ 124 thru the mufflers.

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Buster
Gearhead

Posts: 1553
From: Hurricane alley
Registered: May 2002

posted 05-14-2003 09:00 PM     Click Here to See the Profile for Buster   Click Here to Email Buster     Edit/Delete Message   Reply w/Quote
If it's not pinging, put it back where you started from. and no 40 is not to much with the vacuum advance connected for a street car.

EFI EEC IV systems will go as high as 60 total.

if you have too much vacuum advance you will get a ping with a little "tip in" from the throttle... about the same point you would if your EGR wasn't working.

If you have too much timing base timing you will get a ping WOT or just before. That can be adjusted with your base timing.

Best way to do is by ear, knowing when each advance starts comin in and is in fully.

I always bump the base timing up until it pings WOT then back it down a bit, if you don't have any "tip in" ping or hard starting hot, leave it.

[This message has been edited by Buster (edited 05-14-2003).]

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steve'66
Gearhead

Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000

posted 05-14-2003 09:49 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Ron,

You're gonna have to trust me that you can run more timing at high elevations. The air is thinner and it's like loosing 1 point of compression in the high/thin air.
Your vacumm is very good, created by a mild cam and no vacumm leaks and good valve seal. The motor's in good shape, intake/heads anyway.

Good luck,

SteveW

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steve'66
Gearhead

Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000

posted 05-14-2003 09:56 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Also,

It takes about 3 pounds of boost to equal good sealevel air at your elevation, or about a 40hp shot of nitrous to get your engine to run like it would at sealevel.

Also two stroke engines loose less hp at elevation than 4 strokes. Not that you care, but my outboard speedboat was a lot more competitive at high elevations than it is at sealevel. I added n20 to it up there and it really kicked a bunch of bbc's v-drives.

SteveW

p.s. I'll be out of town (visiting Alex's Chi-town) 'til Monday. Take care.

SteveW

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Fastymz
Moderator

Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 05-15-2003 12:45 AM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Thanks Steve I already trust youu 100%.I'll put it back to were it was.And I may even try alittle more.
Say hi to Mr Alex for me.I wish I was going too.

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SCOOP
oddly obsessed with big scoops on little Mustangs

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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