Bosch Platinum + 4 Plugs
Safety Car
Joined: Jan 2005
Posts: 3,675
Likes: 58
From: Hayward (Bay Area) CA
I've heard nuff about the NGK TR-55s. I wanna know if changing my original plugs (on 99 C5, what ever they are) to NGK will make ANY difference? If no, then there's no reason for me to change now. If yes, then what's the best/easiest way to do it? I hear a few plugs are real hard to change and get to.... 
Thanks in advance....
Thanks in advance....
Le Mans Master
Joined: Nov 2000
Posts: 6,266
Likes: 156
From: Galloway Twp. NJ
Cruise-In VII Veteran
you may notice a difference only due to the fact that the factory delco plugs suffer from losing the platinum "puck" from the tip of the plug, when that happens it opens up the spark gap and could cause some performance issues.
depending on how many miles are on your '99, I would say change them just for the piece of mind!
it can't hurt......
for under $14.00 a set, I change my TR-55's just about every year, It's part of my spring tune up.
depending on how many miles are on your '99, I would say change them just for the piece of mind!
it can't hurt......
for under $14.00 a set, I change my TR-55's just about every year, It's part of my spring tune up.
Race Director
Joined: Jul 2005
Posts: 11,308
Likes: 1
From: The Beautiful Greater Bay Area California
I've been happy with the Platinum +4's, and, the Platinum Series spark plugs in general, since the early nineties on all my Vettes. NGK is also a fine spark plug. However, I use the NGK's primarily on all my bikes. Moreover, as an affordable low cost alternative and value, the NGK's TR55's are great. Good luck to you.
Racer
Joined: Jun 2004
Posts: 423
Likes: 0
From: Okiehoma
Originally Posted by RPOZ4Z
I know that I LOST power using them!
there's nothing better than a good old fashoned copper plug for performance!
that's why I'm using NGK TR-55 plugs, and the NGK plugs only cost about $13.00 for the set, as opposed to the Bosch +4's that cost about $13.00 each! 
there's nothing better than a good old fashoned copper plug for performance!
that's why I'm using NGK TR-55 plugs, and the NGK plugs only cost about $13.00 for the set, as opposed to the Bosch +4's that cost about $13.00 each! 
Le Mans Master
Joined: Sep 2004
Posts: 7,027
Likes: 6
From: Shiloh Ohio
Originally Posted by edensknight
I've been happy with the Platinum +4's, and, the Platinum Series spark plugs in general, since the early nineties on all my Vettes. NGK is also a fine spark plug. However, I use the NGK's primarily on all my bikes. Moreover, as an affordable low cost alternative and value, the NGK's TR55's are great. Good luck to you.
Safety Car
Joined: Sep 2005
Posts: 4,501
Likes: 1
From: TAMPA BAY FL.
Originally Posted by wrustywrench
Oh,, you gotta use them with the tornado intake dealy ,, and magic engine lube and a can of restore to get full effect.
IMHO,,, use a good NGK...or Nippondenso ,, the gimmicks are, well, gimmicks in my book.
IMHO,,, use a good NGK...or Nippondenso ,, the gimmicks are, well, gimmicks in my book.
Pro
Joined: Nov 2004
Posts: 743
Likes: 1
From: Bartlett IL
Originally Posted by 88redvert
An explosion is not an explosion. A lot of Research is done by oil companies and fuel additive companies to try and obtain a more uniform flame front in the combusiton chamber to increase complete combustion....
Incomplete combustion is why catylitic converters exist and so many Forum members worry about passing a sniffer (SMOG) test.
The more uniform the flame front, the more complete the combustion ... the more power and less residual hydrocarbons.
Racers have been using "cutback" plugs for years to increase horsepower. That is the theory behind the +4's 4 cutback electrodes to unshroud the spark and permit more complete combustion.
Whether it works is another matter...
Incomplete combustion is why catylitic converters exist and so many Forum members worry about passing a sniffer (SMOG) test.
The more uniform the flame front, the more complete the combustion ... the more power and less residual hydrocarbons.
Racers have been using "cutback" plugs for years to increase horsepower. That is the theory behind the +4's 4 cutback electrodes to unshroud the spark and permit more complete combustion.
Whether it works is another matter...
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Verdad Gallardo
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
Originally Posted by turboc5
I agree 100% but only in a race application. I've also seen ware people go so far as to shim or machine the spark plugs so the electrode is in the same prime location for all cylinders. As far as a stock ls1 you won't see any results and depending on the heat range and gap you could loose power. I just use TR55's. Their cheep and I've had good luck with them. But since their copper, they don't last as long.
This helps a lot.
I did it it first thing, when I got my 93 Firebird, 94 z-28. 98 SS and 02 Zo-6. It does help your ignition.Helps noticibly each and every time,
One of the best free mods. Lt-1 the ls-1, ls-6.
All love indexing. Jacob's has dyno'd 1-1/2 hp
per cly.
Le Mans Master
Joined: Nov 2001
Posts: 8,080
Likes: 151
From: Toronto
Originally Posted by GeorgieMporgie
Can you really get an extra 5-6hp by installing a set of Bosch Platinum + 4 spark plugs? 
http://www.turbonator.com/index.html...dsTurbonatorTO
http://www.autobarn.net/torfuelsav1.html
Drifting
Joined: Feb 2003
Posts: 1,778
Likes: 1
From: Myakka City Fl
Super Spark Plugs!
J.C.Whitney used to sell Spark Plugs 40 years ago that gained you 25HP and 35 MPG. Perhaps they still list them in their catalog. I think if you installed their mini supercharger you gained an addl 25 H.P.
Oh, by the way I have Bosch Plugs in my C5 but only because they were on sale!
OGC5
Oh, by the way I have Bosch Plugs in my C5 but only because they were on sale!
OGC5
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Originally Posted by RPOZ4Z
... and the NGK plugs only cost about $13.00 for the set, as opposed to the Bosch +4's that cost about $13.00 each!
But, for those that don't realize it, you can get Bosch Plugs and Micro Edge Wiper Blades from AMSOIL. Cost for the +4s is less than half that quoted above, and less than that for AMSOIL Preferred Customers.
Bosch part# for the +4s for the C5 via AMSOIL is B4458
Bosch Micro Edge Wiper Blades part# for the C5 via AMSOIL is B40922
Orders via my dealership (link in sig) benefit my raceteam and the forum.
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C66 Racing #66 NASA ST2, SCCA T2
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C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
