[yellow1098]

Trying to learn about timing and adjustments I should make for my engine to run safe and at the best performance possible. It currently runs pretty well at 28 degrees across the entire curve. So there is a lot of room for adjustment, as you can tell I need some help and a full complete novice about timing. Thank you guys!

Current setup:
Holley terminator X
Cam 246-259
Edlebrock round ports 340cfm
Northwind intake
10.1 compression
1300 Wilson throttle body
461

[steve25]

What are you running for a Distributor , are you running headers ?

What would you like a improvement in.
Cold start / running?

Low speed running ?

Mid range power?

Top end power?

Fuel mileage?

[yellow1098]

Holley controlled dual sync distributor
Hooker super comp headers 3” collector 2.5 inch primary’s

Definitely mid range and WOT

I am for sure missing out on a lot of power

[steve25]

Wait now, 2.5” primary tubes ?
Can’t be!

Off the top of my head in regards to timing I would want you to be running 32 total until a chassis dyno session or track time shows other wise in terms of needed more or less.

You did not post any flow numbers for your heads other then peak ( which is on the useless side to me) nor did you post your actual valve lift, but I can take a guess that with the peak air flow you did post up that the Northwind intake may be a good choke point in the power production of your 461, but once again I would first like to your valve lift and actual intake port flow numbers.

[yellow1098]

Here are the details on the heads and the headers…..I definitely explained that wrong…thanks again

[steve25]

Thanks for this info.

Can you provide the details on the cam, or at least the valve lift you have?

[HWYSTR455]

Yeah, you need to work on your timing, def missing out.

Here's mine, Dominator ECU, sequential, 342 gear, runs great.

.

[HWYSTR455]

That's pretty conservative too.

If you try to copy it, make sure to pay attention to the scales. (MAP & RPM)


.

[HWYSTR455]

What rear gear are you running?

Make sure you follow the 'ignition sync' instructions/guidance in some of the docs and from the holley forums:

https://forums.holley.com/forum/holl...ng-Holley-EFI=

Should go over the initial checks thread just for good sake:

https://forums.holley.com/forum/holl...nts-Read-This=


.

[yellow1098]

Thank you for that table HWYSTR….I will working on getting mine close to that…..I also have 3:42 gears…..what kind of power are you making with your setup?

Here is The Cam I’m running also…

[HWYSTR455]

That cam looks nice.

The one app that the timing pic cam from is a IA2 535, Butler 315cfm E-heads. Spotts estimates the hp around 670, the heads are holding it back. Never dyno'd, not concerned about what the dyno numbers are.

Cam card attached.

.

[yellow1098]

Mine was built to be around 670 also….my heads have plenty for that but I think my compression may be what’s holding mine back a bit

[HWYSTR455]

Yeah, compression ratio doesn't make as big a diff as most think. If you're concerned about it or are curious, could always do a chassis dyno session.




.

[yellow1098]

I’m not to concerned but the butt dyno is that it’s a rocket…and I went to meet my buddy’s at the track right after I got it all together with only about 200 miles on the new engine and got talked into a light track pass….no launch eased off the line no rear suspension setup….not even wide open and it went 11.88 ….that was with the 28 degrees timing across the board of timing.

Also on a couple 35mph rolls I gapped my buddy’s new C8 and a older GtR so I’m happy as hell!

Last night I played with the table a bit and bumped it up 32 degrees total timing and it felt way faster now….ready to go make another pass

[HWYSTR455]

You will see it actually improves once it's had time to learn after a timing change. Timing change will effect AFR (and base fuel table).

For a generic intro into building a timing table, you can check out the Holley EFI vid on YT:

https://www.youtube.com/watch?v=tGlPoWK2kf0


.

[chuckies76ta]

I'm no expert, that's for sure. but I'm curious. Is that Cam a little on the small side for heads that flow 340 cfm's? And the cubic inch of the engine will also factor into the cam size right? Ex: 461 cu in.

What size exhaust are you running? Nice to see the 2" headers with 3.5" collectors. I'm hoping you did 3" exhaust. You should be well into the 10's when you get it dialed in.

[yellow1098]

Thanks chuck! This was the largest hydraulic roller cam Butler suggested 246-259….I was thinking the same thing on maybe it should be alittle bigger with my large heads….maybe I can swap it later but if I get in the 10’s I’ll be happy……the 3inch exhaust is the last step I need to get dialed in

[HWYSTR455]

Well, you could go solid roller.

The lift will make up for any 'lack' of duration, and think lifter RPM will be your limiting factor. A solid roller would take care of that.

I think the cam is fine, run it and see where you're at, but much bigger and you might have to juggle tuning if you run it on the street. I'm sure the 114 is helping with that right now.

I ran a solid for years in a 461 on the street, was 248/254, .620, 114, and it still ran enough vacuum for brakes with a dual diaphragm booster. It was pretty healthy. It had 315cfm heads too.

Just went thru that 461 and used a hyd roller, the voodoo 243/251, .565, on a 110. That will go in the 'bird when I get it from paint jail.


.

[yellow1098]

We’ll see how it goes…..but I did get it broken in on a dyno where it made 619 and that was with a tiny Holley 750