Installed granatelli coil packs 28-1812CP
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Installed granatelli coil packs 28-1812CP
Just installed a set of granatelli coil packs on my truck. My setup has a whipple supercharger/39lb cobra injectors/jba headers/magnaflow exhaust/SCT custom tuning. Initially, I was disappointed with the dyno numbers after the install. Granatelli advertizes about 10-15horsepower increase on N/A vehicles and up to around 20hp on Supercharged vehicles. I only got about 7-8rwhp increase with about 8rwtq increase. When I saw those numbers my heart kinda sank a bit. BUT...when I looked closer I reached those numbers about 600-700rpms sooner across the band. That kinda made me feel better. When I took the truck out for a spin I had a grin on my face (not a full on smile...but a grin). I definitely felt a better throttle response. So, my conclusion to this product would be get it (IF you can find a good price). I would not pay for list on this product to get that kind of result. I believe it lists for about $499-599. I got mine at lethalperformance.com for $379 shipped (this is with 5% off for holiday sale that they are having). Probably the limit I would pay for what I got out of it. I'm hoping it will payoff when I upgrade my supercharger to 10 lbs of boost from 8 lbs. Hope this helps anybody who's considering this product. Also, I did find a post out there that someone had problems with these coils at about 5000 miles. I'll see what happens with mine. I saw this post after I already had it installed. Wish me luck.
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Probably one of the few success (kinda) stories with those things. Several people that I know have had nothing but problems after installing them. Think Neal had a set and they never worked either. There is another company that makes high-output coils now and in their setup you have to reverse the polarity on the connectors to the vehicle harness before hooking up the coil packs. Is it the same with the G.M. coils?
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Originally Posted by flavio marco
Good to hear your results are positiveĦĦĦĦ I have my coil packs on order for a while now, but it seems granatelli takes a long time to process orders. How long did it take for you to get them?
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Originally Posted by Huitt24
I bought them so when I up my boost to 10PSI it will help keep the spark from being blown out.
Lots of guys make big power with the factory coilpacks at higher boost pressures than that.
Are your plugs gapped correctly?