Granatelli Xtreme coils... 27whp/24wtq??!!
05-01-2009, 10:50 AM
#13
5th Gear Member
Join Date: Aug 2007
Location: Hollister, CA
Posts: 2,041
My understanding is you'll see a decent gain on an FI vehicle and you MIGHT get some minor gain (~5 RWHP) on a NA car, IF you have a calibrated butt. People will claim numbers that just simply aren't real world, even if they're NOT the manufacturer. Until I see more unbiased data, I'm not sold. And IF it gains about 5 RWHP or so on a NA vehicle, I'll spend that kind of loot on other proven, less expensive 5-10 RWHP mods.
Good point..one other thing to note GMS CAI, hmm... Sounds like hype to me. As they say dont believe the hype.
05-01-2009, 01:02 PM
#15
3rd Gear Member
Join Date: Apr 2005
Location:
Posts: 602
I bought a set of the GMS x-treme c.op.s last month, they are currenly on there way back to GMS. They lasted about a week, no way did they give me 27 hp. The car started to surge, at times it would develope a slight miss at idle, then they completely failed the car missed so bad I couldn't even drive it. I blamed everyting but the cop's, I changed plugs, tried three different types of fuel, as soon as I changed back to the stock cop's the car has now ran perfect for over a week. GMS said they would give me a new set, I said no way, now I will be charged a 15% re-stocking fee for defective parts.
05-01-2009, 01:07 PM
#16
5th Gear Member
Thread Starter
Join Date: Jul 2007
Location: TX
Posts: 4,897
Damn, you wouldn't happen to receive your paycheck from weapon-x? 
I don't know what to believe anymore... I keep putting parts on the car, deciding what works and what doesn't myself but it gets REALLY expensive lol.
I don't know what to believe anymore... I keep putting parts on the car, deciding what works and what doesn't myself but it gets REALLY expensive lol.
05-01-2009, 01:22 PM
#17
5th Gear Member
Join Date: Sep 2007
Location: Tampa, FL
Posts: 2,181
All I can say is that I haven't had any problems with my MSD cop's and I thought I could feel a slight difference, but not anywhere near what GMS is claiming. I mainly got them because they look better than the factory ones.
05-01-2009, 01:30 PM
#18
5th Gear Member
Join Date: Aug 2006
Location: Near Wash. DC Posts: 13,541
Posts: 2,497
ha ha based on the descriptions of people who have them it's plausible that the cause of any significant results is that the Granatelli COP is so poorly manufactured that the randomness of it's spark is responsible for the big gains.
Either way:
Either way:
Last edited by Legion5; 05-01-2009 at 01:32 PM.
05-01-2009, 01:40 PM
#19
6th Gear Member
Join Date: Sep 2006
Location: Gainesville, FL
Posts: 11,278
No way they gained that much from COP's. What was the before and after numbers?
I have the accel coils and they have been running fine now for some time. I can't really feel a horsepower increase, but I noticed a much smoother exhaust tone and smoother acceleration.
I have the accel coils and they have been running fine now for some time. I can't really feel a horsepower increase, but I noticed a much smoother exhaust tone and smoother acceleration.
Last edited by moosestang; 05-01-2009 at 03:55 PM.
05-01-2009, 01:59 PM
#20
5th Gear Member
Join Date: Sep 2007
Location: Tampa, FL
Posts: 2,181
Smoother acceleration would be how I would describe what I felt with the MSD's, kind of like how it felt after I installed my UDP's.