I just bought a set of those rapidfire sparkplugs $4.00each , and am installing them tomarrow . Has anyone had any kind of expeirences with them ----they claim 18% better throttle response , Ha....right !

 

I used them once and didn't really see all that much difference. But I don't have a MSD for my ignition and I heard you will see better performance with that.
But in either case it is always good to put in new plugs!


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89 IROC 350 Auto
Air Foil
TPIS Underdrive pulleys
K&N Air Filters & Mods
Modified MAF and screens removed
Ported Plenum
Edelbrock TES Headers
TRUE DUAL Exhaust
Edelbrock Performer Aluminum Heads
ZZ9 Cam
TPIS Level 5 Chip
2200 Stall Converter
2.77 Rear Gears(gotta get 3.73)

 

I have Rapidfires and a MSD 6AL and MSD coil, I noticed a little better throttle response. Rapidfires are pretty good plugs. You should gap the plugs to about ".10 over what the book says if you put on am MSD.
Hope this helps,
CptMidway

 

I think my car ran worse, On more than one occasion I have had customers bring them back, my 1st Assistant is really hot to sell them, I think that is rediculous price for a spark plug, when a 99 cent autolite works just as well, besides, its not even platinum. they do have a 30 day money back.

 

I don't know about the Delcos, but I put a set of Bosch Platinum +4s in my stock 85Z and noticed a BIG difference. Couldn't tell ya how much %wise, but there was a considerable jump in how quick it got. Put up a post and let us know what you think of the Delcos.

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`85 Z28 5.0L TBI
Don't ever be:
Found On Road Dead!

 

I've used the Radidfires on all my cars. Not sure if it did anything for my T/A though, car has chronic engine probs, I do have an MSD coil, and my plugs are gapped at .045.

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Zepher
86 Pontiac Trans Am : 305 carbed V8 5 Speed. Edelbrock Open Element Air Cleaner: Flowmaster Exhaust,
160* Thermostat, Grant GT Steering Wheel, MSD HEI Coil, Taylor 8mm Wires, Recaro Seats, Alpine CD+Changer,Rockford & Soundstream Amps, RF 12" XLC's, Polk Audio highs/mids.
Edelbrock Performer RPM Intake coming soon.
Pics of my Pontiac Trans Am & Sunbird
86 Trans Am & Girls

 

Ac Delco Rapidfires.... man, i think i got ripped on this... theyre not bad for plugs, but for four bucks a pop, with all these claims that i dont feel, i see that it would have been better to go with the bosh's cause i put em in on my friends V-6 blazer, and that i could seriously feel it kickin.

 

I think its just stuipd that any of u think a spark plug would give you a noticable difference in performance. All you really get is better gas mileage. Now if you changed out some REALLY REALLY bad plugs and put a new set in then u may notice and better response. Is that what u guys are talking about? Do u guys all have really old plugs? Cause I used Rapidfire's on my car and I didn't notice anything but a slight increase in gas mileage. But like that one guy said, its always nice to have new plugs.

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Eric Natzke
91 Firebird 305 TBI (dropping in a 355 summer of "01")
Edelbrock TES Headers, P265/50/R15's, MSD 8.5mm superconducters,TBI Spacer,Accel Cap & rotor,180 Fan Switch,160 Thermostat,Hypertech Thermomaster,TransGo ShiftKit,B&M Supercooler, March pulleys,Dynomax 3" Cat-Back w/ flowmaster muffler,Smog pump and AIR pulled, Edelbrock Strut Tower Brace, 3:73 Richmond Gears and K&N 14x3 open element.

http://hometown.aol.com/J007Golden/index2.html

 

I use rapid fire, and gap them at 30. I run nitrous so that is why such the low gap. I stay away from anything platinum, because nitrous will melt them.

Rapid fire is a good plug.

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1992 Z28 5.7 TPI 700R-4
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