Best spark plugs for the ls1
Launching!
Joined: Mar 2002
Posts: 202
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From: nowhere in particular
Originally Posted by v8maro
Someone told me the Bosch plat's +4's are the best, I think he's on crack, am I right?
-Steve
-Steve
Can someone give an exact specific reason they don't like Bosch +4s in LS1s, besides "they are crap"? It gets kind of annoying hearing people say they are crap without any concrete evidence.
i just changed my plugs today...first time took me about 45 mins, its not bad. the only reason it took me that long is that for teh back one (passenger side), i went in under the car (easier on my fat hands) 
Originally Posted by sunsetz28
Can someone give an exact specific reason they don't like Bosch +4s in LS1s, besides "they are crap"? It gets kind of annoying hearing people say they are crap without any concrete evidence.
TECH Fanatic
Joined: Nov 2002
Posts: 1,889
Likes: 1
From: Lincolnton, NC
I for one would like to know who the certified testing agency was and the parameters that were used to judge each one. I too get miffed when someone reads another post and accepts it as true then spouts off to the world that it's true. Just someone did a test somewhere in the past that I think I recall and the individual that was conducting this test was certified to do so and post their results. Bosch 4's crap please. Best, who knows.
No real lab tests involved I'm sure, just proven dyno and track testing I'd assume (and that's enough for me)....'better plug' is all relative though, do you want the best spark/most power or the longest lasting/most expensive?
I'm sure any Bosch platinum will outlast any NGK copper so in that regard it's not crap at all. But I want to go fast first and extend my plug changing intervals second so TR55s it is.
I'm sure any Bosch platinum will outlast any NGK copper so in that regard it's not crap at all. But I want to go fast first and extend my plug changing intervals second so TR55s it is.
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Launching!
Joined: Jun 2003
Posts: 249
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From: texas unfortunately for now
Originally Posted by sunsetz28
Can someone give an exact specific reason they don't like Bosch +4s in LS1s, besides "they are crap"? It gets kind of annoying hearing people say they are crap without any concrete evidence.
This is a technical forum. If you don't like the question. MOVE ON! Personal attacks will not be tolerated!
Last edited by WILWAXU; Jan 17, 2004 at 07:42 AM.
TECH Fanatic
Joined: Nov 2002
Posts: 1,889
Likes: 1
From: Lincolnton, NC
LS1LT1 gave a good response. There are different plugs for different objectives, pick your objective. My contention is calling something crap without merit and stating all this testing. What testing? Seat of the pants testing can be very deceiving when people like you who have been anally violated but swear you felt a big gain. Have a good evening, Louis.
Last edited by WILWAXU; Jan 17, 2004 at 07:43 AM.
I've had my Bosch +4's in and haven't had any problems. They are a good stock replacement to the OEM Delcos. I know dirt track racers that do use the Bosch brand of plug with good results. It all really depends on your choice of poison. It looks like NGK's are much better in quality than they were in the 80's when I first tried them. For nitrous applications I would probably use a different plug that's not susceptible to associated problems. I don't think they are garbage though, because you wouldn't have so many OEM manufacturers and motorsports race teams that use them if they were. We're all pretty passionate about our preference on this and that's a good thing 
.
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On The Tree
Joined: Jul 2002
Posts: 109
Likes: 0
From: Edmonton, Alberta
I don't like the design of the Bosch "+" plugs at all, the extra ground electrodes can only serve to block your flame front... In my opinion, a gimmick in our vehicles. Multi-electrode plugs do have their place in industrial engines and airplanes, but not a road-going performance car. The other thing that is total crap is the pricing of the Bosch plugs, do you really beleive that adding two ground electrodes should double the cost for the spark plug itself? I almost feel like Bosch should be charged with false advertising, their ads for the plugs suggest higher performance with more electrodes, when, if anything, it's the opposite. By the way, my company is a major distributor of two lines of spark plugs, for industrial engines mostly, I don't have a "scientific test" but I don't need one either...
TECH Fanatic
Joined: Nov 2002
Posts: 1,889
Likes: 1
From: Lincolnton, NC
Louis,
You started the personal attacks to which I should not have responded to in kind. You seem to be the only one that is angry with me for questioning so you should MOVE ON. Being an engineer, I wanted more insight into this testing and inquired about these facts. Otherwise, it is personal opinions with some that are formed through experience with a product. I have never used TR55's. Does that mean I can accurately comment on them? Just cause you use them have you ever REALLY compared them to others besides putting them in and driving around? Usually plugs are replaced because they are worn out so of course the new will feel better and your mind (or seat of the pants) will tell you that you gained power. You can respond to this if you like, but for me I've had enough.
Sawedoff and Edmonton, good input. Did not know Bosch was so expensive though. I've never used them either. The pricing and claims that you say they state reminds me of the old Split Fires. What a crock those were.
You started the personal attacks to which I should not have responded to in kind. You seem to be the only one that is angry with me for questioning so you should MOVE ON. Being an engineer, I wanted more insight into this testing and inquired about these facts. Otherwise, it is personal opinions with some that are formed through experience with a product. I have never used TR55's. Does that mean I can accurately comment on them? Just cause you use them have you ever REALLY compared them to others besides putting them in and driving around? Usually plugs are replaced because they are worn out so of course the new will feel better and your mind (or seat of the pants) will tell you that you gained power. You can respond to this if you like, but for me I've had enough.
Sawedoff and Edmonton, good input. Did not know Bosch was so expensive though. I've never used them either. The pricing and claims that you say they state reminds me of the old Split Fires. What a crock those were.
Ram It,
These (+4's) are a good service replacement plug. They do work much better than the OEM units. If I were using nitrous, or under racing situations I would use another plug from their line, or a different brand. I would get a plug that I could adjust the gap with, and pick and choose a heat range with. For a long life, quality service replacement part, the Bosch line is good. This style of plug is not designed for boost applications. From the way the plug is designed it would be a "glow plug", which is not what you'd need in that application. Whether or not the extra electrodes do anything is up in the air. I just thought I'd give em' a try, and I like them.
These (+4's) are a good service replacement plug. They do work much better than the OEM units. If I were using nitrous, or under racing situations I would use another plug from their line, or a different brand. I would get a plug that I could adjust the gap with, and pick and choose a heat range with. For a long life, quality service replacement part, the Bosch line is good. This style of plug is not designed for boost applications. From the way the plug is designed it would be a "glow plug", which is not what you'd need in that application. Whether or not the extra electrodes do anything is up in the air. I just thought I'd give em' a try, and I like them.
Teching In
Joined: Feb 2003
Posts: 36
Likes: 0
From: Marysville, WA
I used to run TR55s, until I saw a chart from a spark plug test (got it from one of the sponsors). It showed them to misfire pretty badly from 5k on up. The winner of that test? Denso Iridiums. What can I say, I changed to them. And they last 100,000 miles (for normal people....not me)
