[1320quick]

Hi Guys, Looking for some tuneup advice. This is my first attempt at cutting plugs apart to check them. These plugs have 3 1/8 mile passes on them. The car was towed to the lanes and back to the pits on all 3 passes. The first pass, it spun the tires 6 feet into the pass and I aborted the pass and drove part throttle till I was off the track. Hope that does not screw up the reading on these plugs.

24* Victor headed 509bbc, nitrous cam, 1050cfm Quickfuel carb in a 3450lb door car.
Single stage NS fogger 32N-24F, 5.4 lbs flowed though a .073 jet
Base timing is 36* pulling -12* (-6* with crank trigger and -6* with MSD 7530 box) so 24 degrees total
R5671A-9 NGK's, VP C16

On the last pass, I added .3* of timing so 24.3 degrees total and the car picked up 1mph.

It looks fairly fat to me. I'm unsure about timing and heat in the plugs. For what it's worth, the two full passes were the two quickest passes the car has ever made.

 

[425ci]

Very fat . I cant tell where the heat is , picture is not clear on my screen .

 

[johndougherty]

What bottle pressure? Looks like a cold or half full bottle was used

 

[1320quick]

What bottle pressure? Looks like a cold or half full bottle was used

It was a full #10 bottle on both passes. Bottle pressure was 930lbs.

 

[johndougherty]

It was a full #10 bottle on both passes. Bottle pressure was 930lbs.

Any chance the 32 is on the fuel side? How much did you gain with the nitrous on?

 

[425ci]

Next time only make one pass on the plugs until you get the tune figured out .

 

[1320quick]

Any chance the 32 is on the fuel side? How much did you gain with the nitrous on?

No the .032 jet is for sure in the nitrous side and I'm very careful with that. The car goes 7.10 on the motor and went 5.59 on the bottle.

 

[1320quick]

Next time only make one pass on the plugs until you get the tune figured out .

Ok, I'll do that going forward. I'm pretty new at trying to tune my nitrous setup and trying to learn all I can. I'll take any advise I can get. Thanks

 

[bjs344]

I would go to a -10 plug. It sounds like you have the phasing off by the way you described your timing? Base timing is not at 36 anymore if you moved the crank trigger. That might be where you are still phased, which is not good.

I would change plugs, pull a couple more degrees, and then lean it out. But before you pull any more timing, make sure the distributor is phased around 26 degrees.

 

[colo cracker]

Hi Ron, congrats on the PB it looks like you have the car leaving nice from the vid. Give me a shout when you get free. 352-593-5900 I will leave for Georgia later today but will be here most of the day. Don't take any more timing out of this, it will get you in trouble. You are not far away from where you need to be, you need single run plugs for sure tho.
P.S. you forgot to tell everyone where you race. It will help them understand your E.T and timing numbers lol :-D
PK

 

[Beyond]

I'd bet those plugs were more of a light gray if you had pulled them after one full pass vs multiple passes on them. Need to look at them with only one full pass.

 

[1320quick]

I would go to a -10 plug. It sounds like you have the phasing off by the way you described your timing? Base timing is not at 36 anymore if you moved the crank trigger. That might be where you are still phased, which is not good.

I would change plugs, pull a couple more degrees, and then lean it out. But before you pull any more timing, make sure the distributor is phased around 26 degrees.

Thanks, I will double check the rotor phasing but I believe it's phased for 24*. I figured I needed to take 12* out for the .032 jet so I split the difference, 6 on the crank trigger and 6 in the msd box.

As requested by PK, we race in Denver Co at Bandimere and the DA was over 8500' for the passes in question. It's kinda hard to make them run up here when we don't have any air.

I will be sure to just make one hit on the plugs before pulling time next time. I did check all 8 after every pass but I didn't replace them. For some reason I had it in my head that I had read that the fuel ring needed a couple of passes to get a correct reading so that's why I ran them 3 passes. Thanks for all the advice guys, I'm just trying to learn.

 

[johndougherty]

No the .032 jet is for sure in the nitrous side and I'm very careful with that. The car goes 7.10 on the motor and went 5.59 on the bottle.

Nice gain. How much nitrous do you use per pass?

 

[1320quick]

Nice gain. How much nitrous do you use per pass?

It uses 1.7 to 1.8 lbs per pass depending on how much I have to purge.

 

[82bird]

Thanks, I will double check the rotor phasing but I believe it's phased for 24*. I figured I needed to take 12* out for the .032 jet so I split the difference, 6 on the crank trigger and 6 in the msd box.

As requested by PK, we race in Denver Co at Bandimere and the DA was over 8500' for the passes in question. It's kinda hard to make them run up here when we don't have any air.

I will be sure to just make one hit on the plugs before pulling time next time. I did check all 8 after every pass but I didn't replace them. For some reason I had it in my head that I had read that the fuel ring needed a couple of passes to get a correct reading so that's why I ran them 3 passes. Thanks for all the advice guys, I'm just trying to learn.

It's not about "how much" u pull, its about the total timing when kit is on. That's why most set base anywhere from 25 - 30* then pull lesser amounts
To get to total

 

[1320quick]

It's not about "how much" u pull, its about the total timing when kit is on. That's why most set base anywhere from 25 - 30* then pull lesser amounts
To get to total

Correct me if I'm wrong but I think we are both saying the same thing but I used different words. I figured that 24* of timing with a .032 jet would be a safe place to start. Based upon that, I set the crank trigger timing to 30* and then used the MSD to pull 6* so my total with the kit on is 24*. Sorry if I mis-used "base timing" as I was thinking that base timing would be the number that the engine made the best power at N/A.

 

[johndougherty]

Is there a timing mark on the plugs? its hard to tell from the pics.

 

[1320quick]

Is there a timing mark on the plugs? its hard to tell from the pics.

I'll be honest, I'm not 100% sure thus the reason for this post. Here are a couple more pics of 3 & 5 and 6 & 8. Maybe these pictures are clearer and more focused.

 

[johndougherty]

I don't see a definite timing mark in your pics. I suspect when you pull fuel away it will show up.

Mine is barely noticeable at the tip of the plug.

 

[82bird]

Correct me if I'm wrong but I think we are both saying the same thing but I used different words. I figured that 24* of timing with a .032 jet would be a safe place to start. Based upon that, I set the crank trigger timing to 30* and then used the MSD to pull 6* so my total with the kit on is 24*. Sorry if I mis-used "base timing" as I was thinking that base timing would be the number that the engine made the best power at N/A.

Agreed