Updated Sparkplug Page (Videos, Pics & Instructions)
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Senior Member
Joined: Sep 2000
Posts: 1,636
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From: Olive Branch, MS, Memphis Burb
Jay,
The Splitfire is the same heat range as the TR5. I've never lost a Splitfire but after testing the TR5 I figured it was a safer plug for a 4# pulley. The TR5 gave me similiar throttle response on the street and MPH at the track. I ran the Split's for a couple of months with the 4# pulley but wanted to err on the side of caution. The TR6 is consistantly a mile an hour or more slower on the big end than the TR5 or Splitfire. The Splitfire runs the fastest MPH but it's almost too close to call with the TR5. The ETs are all similiar but the hotter plugs seem to make more HP on the big end.
I put a 5# pulley on a couple of weeks ago and nothing changed with ET or MPH. I put the TR6's in to see if I reached a point to where colder is better. I'll know when I run again next tuesday. The track has been closed for 2 weeks because of the NHRA nationals.
P.S. I think the IT20's are the same heat range as the TR6. They should produce good results for you.
Jeff,
Which version of IE are you running?
The Splitfire is the same heat range as the TR5. I've never lost a Splitfire but after testing the TR5 I figured it was a safer plug for a 4# pulley. The TR5 gave me similiar throttle response on the street and MPH at the track. I ran the Split's for a couple of months with the 4# pulley but wanted to err on the side of caution. The TR6 is consistantly a mile an hour or more slower on the big end than the TR5 or Splitfire. The Splitfire runs the fastest MPH but it's almost too close to call with the TR5. The ETs are all similiar but the hotter plugs seem to make more HP on the big end.
I put a 5# pulley on a couple of weeks ago and nothing changed with ET or MPH. I put the TR6's in to see if I reached a point to where colder is better. I'll know when I run again next tuesday. The track has been closed for 2 weeks because of the NHRA nationals.
P.S. I think the IT20's are the same heat range as the TR6. They should produce good results for you.
Jeff,
Which version of IE are you running?
Senior Member
Joined: Jan 2001
Posts: 1,467
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From: La Habra, CA
Chuck, thanks for the information. I have run my best with the NGK BR7EF's. I ran 105 with a 2# pulley.
Those plugs are very cold, and are generally recommended for nitrous or big boost. I was having a slight ping with the winter gas here, which those solved. They are not a projected gap plug, so they will have the same effect as retarding the timing slightly. That's probably why it ran so well on the top end.
I was able to get about 10k miles out of the things bwfore they started fouling out. I guess it's my lean tune up.
I am going to run my truck with the Denso's in the next couple of weeks, before I go to Phoeinx.
Those plugs are very cold, and are generally recommended for nitrous or big boost. I was having a slight ping with the winter gas here, which those solved. They are not a projected gap plug, so they will have the same effect as retarding the timing slightly. That's probably why it ran so well on the top end.
I was able to get about 10k miles out of the things bwfore they started fouling out. I guess it's my lean tune up.
I am going to run my truck with the Denso's in the next couple of weeks, before I go to Phoeinx.
Senior Member
Joined: Jul 2001
Posts: 2,803
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From: North Canton, Ohio
The tune is the answer.
I have been running the NGK TR-55's with a 6# lower, showing as much as 14# of boost at WOT. Have run 12.71 full dress, but average 12.8's at around 107-108 mph. Sunoco Ultra 94 fuel.
Got a little scared reading some of the info here so I pulled number 1 and number 5 plugs just to see.
My plugs are the prettiest light brown I have ever seen so I plan
on keeping things as they are.
Chuck your info is great.
Marc
I have been running the NGK TR-55's with a 6# lower, showing as much as 14# of boost at WOT. Have run 12.71 full dress, but average 12.8's at around 107-108 mph. Sunoco Ultra 94 fuel.
Got a little scared reading some of the info here so I pulled number 1 and number 5 plugs just to see.
My plugs are the prettiest light brown I have ever seen so I plan
on keeping things as they are.
Chuck your info is great.
Marc
Last edited by Marc Carpenter; Sep 27, 2002 at 11:05 AM.
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Senior Member
Joined: Sep 2000
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From: Olive Branch, MS, Memphis Burb
Jay,
You brought up a good point about octane and gas quality. A hot plug is not going to set well with lower octane, low quality gas. Around here we get 93 octane that is decent quality.
You brought up a good point about octane and gas quality. A hot plug is not going to set well with lower octane, low quality gas. Around here we get 93 octane that is decent quality.
