The June issue of Mod Mustangs & Fords has an article on pg 76 testing the results of some high voltage COPs on a 08 GT/CS with CAI and tune as the only listed mod. The results showed an increase of 27 HP on the dyno. I have seen several comments here that have said that these COPs only make a difference on an engine with power adders. I'd like to know if anybody else has experiences like with this kind of mod. $500.00 with 1 hour labor resulting in 27 HP increase is nothing to sneeze at. Thanks
Hi Volt COPs
- Thread starter jfleetwo
- Start date
squeak93
15 Year Member
Prob just the dyno... most 2v guys don't see chit unless they have a power adder. (My car had screaming deamon's on it and I don't notice anything crazy).
Silverstang02GT
New Member
what kind of dyno were they using? you can manipulate numbers on dynojets fairly easy, a friend that does tuning for Evos was showing me what he can do to change numbers for magazine articles.
what they probably did was run a base tune, then run an optimized tune to make it look like the COPs made a difference.it's crap like this why i no longer subscribe to MMFF
no such dyno. they might be talking about a Mustang Dyno, which are even easier to fool since you can change the weights of the cars.
SaleenGT2001
Well-Known Member
BurningRubber
10 Year Member
- Dec 6, 2004
- 1,865
- 24
- 58
I don't really like bashing, but I have a buddy with a blown Bullitt that was experiencing mis-fires with his GMS coil packs. Factory Motorcrafts cleared the problem up instantaniously.
27hp from coil packs is not gonna happen unless the stockers are mis-firing very badly.
27hp from coil packs is not gonna happen unless the stockers are mis-firing very badly.
twogts4us
15 Year Member
A better article is the one in 5.0 Mustangs and Super Fords, July 09 issue, pages 110 - 118. Not owning an S197, I didn't bother reading the entire article, but of note is the dyno results (a Dynojet) using an 06 GT as the victim. They added a Corsa axleback exhaust, GMS COILS, GMS Pulleys, GMS CAI, Diablo Tune, and Nitrous. The baseline was 268 HP, 295 ft lbs of torque. After adding the exhaust, the numbers were 272/299. Adding GMS coils to the mix, it went to 276/302. Then they added pulleys to get to 284/306 and finally the GMS CAI to reach 283/298. Adding a Diablo Tuner got them to 292/307 before they added the juice. So, with this collection of mostly GMS aftermarket parts, they surely spent some serious coin and gained a total of 23 HP / 12 ft/lbs of torque (without the nitrous). Note that when they added the GMS coils the output increased a whopping 4 HP / 3 ft lbs of torque. Another note - when they added the GMS CAI, they lost 1 HP and, more importantly, 8 ft lbs of torque. To me, these appear to be honest, real world numbers...don't trust the manufacturer's ads with their dyno results that you'll often see and, quite frankly, you can't trust most of the magazine 'tests' either.
So, if I read your post correctly, if the vehicle looses power it most be real but if it gains it is just a fluke or fabrication? How cynical is that. This article was written by KJ Jones. He has tested the GMS coils a number of time on a number of vehicles, both N/A and Forced Fed. Granatelli never claimed the coils would make 20plus HP on an otherwise stock car - but I guess on that day on that dyno they did. I thought it was a crazy number and I made that clear to everyone from day one.
The sad truth here is if they reported a loss of 25hp everyone would have been more then happy to believe that - go figure
Now on to the CAI - the article was written to make the Diablo look like it was the hero. So please note the Granatelli Cold Air Intake combined with the Diablo Tune only made an increase of 8hp and 1 ft/lb. That should be more of a sad representation on Diablo’s part then GMS. Or perhaps the shop that did the dyno work. They are asking us to believe that the GMS cold air and a flash tune could only gain 8hp and no torque increase - I am not pointing the figure here but even the biggest Granatelli haters would agree a honk'n intake pipe and a custom tune should have made more like 20hp not 8. Different dynos on different days will report different results -
SaleenGT2001
Well-Known Member
granetelli parts suck. i've never heard a single good review.
most of them are ripoffs of other companies parts
most of them are ripoffs of other companies parts
twogts4us
15 Year Member
Quite cynical I agree, but this is fueled by companies like yours (and you aren't the only one) who claim big HP gains but, in the real world, they don't materialize. The fact of the matter is this - Aftermarket vendors will do anything they can to create a single run with a larger than life HP gain and then advertise that. Will anyone else be able to create that kind of HP gain? Not likely... But the race is on, and every manufacturer is trying to beat the competition.
Pointless information.
Granatelli never claimed the coils would make 20plus HP on an otherwise stock car - but I guess on that day on that dyno they did. I thought it was a crazy number and I made that clear to everyone from day one.
No, not 20HP, but right from your website, the Pro Series COPS, "Adds 12HP (normally aspirated) & 25HP (s/c, turbo, & nitrous)". And where do you get that it was your coils that made a 20plus HP gain? It was a combination of parts that created that overall gain, not just your coils.
The sad truth here is if they reported a loss of 25hp everyone would have been more then happy to believe that - go figure
Yep, 'cause everyone hates Granatelli. You fuel that hatred yourself by proclaiming to be persecuted by the Mustang crowd (I dunno, maybe the GM folks also hate you?). You routinely deny the fact that some of your parts have been pure junk. I recall a thread a couple years ago with a guy that had your LCAs that literally folded in half. Instead of working with him to remedy the problem, you publicly cast doubt whether the parts were yours or not. If it were me, I would have called the guy and worked it out rather than continuing a 'bad taste in your mouth' thread that engaged way more people than I'd bet you really wanted. Didn't matter though...you kept on publicly ranting. There comes a time when you should take the conversation offline.
What makes you believe a "honk'n intake pipe and a custom tune" would gain 20 HP? And what part of that gain would you equate to the "honk'n intake pipe"? Surely if you lean out a motor enough you could gain some decent HP, but at what expense?
But really, what is the 'magic' behind a big intake pipe? It's similiar to the buzz about using a bigger MAF. Jeez, I could make a MAF out of a piece of PVC. In the end, these are just oversized breathing tubes. Do they help? Somewhat, but there is a point where you lose intake velocity and thereby lose power.
And of course "different dynos on different days will report different results". No one would dispute that. But typically, you'd expect to get very similar #s from the same dyno. I wasn't aware...did they use different dynos?
Lastly, I can't believe you dug this old thread up over 2 months after it was originally posted. Why bother? Do you feel that you are helping the Granatelli brand?
Similar threads
- Locked
