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Did some logging toda - tested 0.022 spark gap and resonator delete

4032 Views 12 Replies 5 Participants Last post by  XtremeRevolution
So after talking to vince yesterday, I started thinking hard using all the knowledge I have about automotive. I wondered if all the timing was being pulled because of the higher altitude and my spark gap. I've known drag racers with cobras who have had to run really low gaps to not only prevent blow out, but also to keep temps down and make more power. Seems backwards, but I went ahead and re gapped my plugs to 0.022. Stock was 0.025 across the board and I gapped them to 0.028 last week.

My plugs were starting to turn white (too hot) so I'm really glad I reduced the gap. When at 0.025/0.028 I would get on the throttle and around 3k it felt like timing was being cut. Now I don't feel that. At 0.022 I no longer feel that and my logs show that it isn't pulling so much timing now. I think I'll stay with 0.022.Additionally, I wanted to determine if the resonator delete really helped lower IAT's.

There was a big debate on XR's thread and I never saw anyone show any proof (although I'm sure someone has done so). So I went ahead and did it anyway.

(Green = AAT, Red = IAT)

No delete (2nd run)
View attachment 8286
With delete (1st run)
View attachment 8287

Looks like a 5 degree drop. That's significant IMO.As you can see the AAT's were higher when I did the first run. This is because I had been driving around. I went home, put a box fan on the engine bay while I inserted the ducting. I did however, drive the same route and drove the same way shifting at 5k in 3rd gear. I went East and then West.

I don't really see a point in spending $250 on a CAI since it's just pulling from the same place and isnt sealed up. Going to cut a 3" hole in the bottom of the air box like one of the other user's did. These are my finsings. I'm pretty satisfied with my changes.

I hope this encourages you guys to do you own testing now that we can see our logs.
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I checked my plugs today actually. I had them at .035 and went to .030 just to see what would happen. Engine actually runs a tad bit rougher, but regardlesss. When they came out, the electrode was medium-light gray on all of them, indicating a normal condition. No signs of overheating, and I have just over 15k on them.

I wonder if those with the tune are showing hotter temps due to the tune itself and if this doesn't apply to stock motors.

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From what I've heard, the MAF also reads temp. What's the temp difference between the resonator stock and the resonator bypassed? If the pre-turbo temps are lower, not only will the turbo have to work less hard (thus creating less heat), but heat soak in the summer should also be alleviated to some degree.

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According to other members, our ducting isn't that restrictive. Except for the filter, there isn't anything in the way to restrict air flow. I'm ordering an AEM dry panel filter so I'll see what the flow is after the install.
Whoever says our ducting isn't restrictive needs to actually try the resonator bypass. The very significant improvement in throttle response is obvious. If you remove the ducts and see for yourself, you'll see how bad it is. If it was one straight tube, perhaps it might not be that bad, but it constantly changes shape and direction. That's beside the fact that it's well over 3 feet long. It's restrictive.
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