Procharged H/C Denali - HELP
09-04-2015, 11:11 AM
#1
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Procharged H/C Denali - HELP
Okay guys,
Here is quick recap. We built the truck back in 2005 (its an 04) and ran it up until late 14' with a D1-SC Procharger at 10 psi boost, 42lb injectors, built trans, meth injection... Basic stuff.
Within the past 4-5 months, we added a Livernois Motorsports Heads/Cam package, KB Boost-A-pump, and 63lb/hr injectors, and exhaust cut outs. BEFORE the heads/cam kit, the truck would run around 13.7 to 13.5 at the local track at about 99.5 MPH.
We had been having issues with the crank pulley (Shop that did all recent work did not put a new crank bolt or put loctight on the bolt) We installed a new crank bolt and after reading many different ways on the internet on what torq specs to crank it to, cranked it to 240ft/lbs. It was recessed in way too far and did not line up with the rest of the serpentine system. Said shop pulled the crank pulley back off and reinstalled it with loctight. We took it to the track last friday night and it only managed to drop to a 13.33 at the same MPH.
On the way home from work the other day, the serpentine belt came off again, and the crank pulley was recessed too far in, after it had lined up for about 200+ miles.
MY QUESTION: After over torqing the crank pulley to 240 ft/lbs, could it be spinning on the crank since it is not keyed? Also, could the converter be too tight with the new mods and that is why it falls on its face so hard going into 3rd gear and is so slow out the back door of the track? I'll include the vids of when we ran it at our local track a couple years ago PRE heads, cam,cut outs, when we ran it at MIR when it was >32 degrees outside and it went its fastest pass ever, and its pass from the other night.
Local Track a few years ago
MIR in 32 degrees
August 2015
Open to all opinions...
Thanks!
Here is quick recap. We built the truck back in 2005 (its an 04) and ran it up until late 14' with a D1-SC Procharger at 10 psi boost, 42lb injectors, built trans, meth injection... Basic stuff.
Within the past 4-5 months, we added a Livernois Motorsports Heads/Cam package, KB Boost-A-pump, and 63lb/hr injectors, and exhaust cut outs. BEFORE the heads/cam kit, the truck would run around 13.7 to 13.5 at the local track at about 99.5 MPH.
We had been having issues with the crank pulley (Shop that did all recent work did not put a new crank bolt or put loctight on the bolt) We installed a new crank bolt and after reading many different ways on the internet on what torq specs to crank it to, cranked it to 240ft/lbs. It was recessed in way too far and did not line up with the rest of the serpentine system. Said shop pulled the crank pulley back off and reinstalled it with loctight. We took it to the track last friday night and it only managed to drop to a 13.33 at the same MPH.
On the way home from work the other day, the serpentine belt came off again, and the crank pulley was recessed too far in, after it had lined up for about 200+ miles.
MY QUESTION: After over torqing the crank pulley to 240 ft/lbs, could it be spinning on the crank since it is not keyed? Also, could the converter be too tight with the new mods and that is why it falls on its face so hard going into 3rd gear and is so slow out the back door of the track? I'll include the vids of when we ran it at our local track a couple years ago PRE heads, cam,cut outs, when we ran it at MIR when it was >32 degrees outside and it went its fastest pass ever, and its pass from the other night.
Open to all opinions...
Thanks!
09-04-2015, 12:12 PM
#2
There are a few things here that will make this Denali perform night and day better than it does now.
The first and most important in my opinion it this. You added heads and a cam. Those are great for adding power. But they are great at adding power at higher RPM, not off idle. I would guess on a relative basis (same weather and conditions) your MPH improved in a big way, but your 60' times may have in fact suffered, or not improved by the same margin. Getting a vehicle off the line is where a race, or in this case your time, is won or lost.
Do you still run the stock fuel pump? Does the truck go lean on the top end? Your stock fuel pump will not supply enough fuel even with the BAP I don't think.
Do you have a converter? If not get one, and your times will be where you want them.
Who tuned it?
On the pulley front... do you have the right part? It doesn't sound like it. GM accessories have a lot of different offsets and I would be willing to guess yours isnt correct. Once installed this thing should absolutely not move on the crankshaft. You should pin it to keep it from spinning, but it should not move in.
The first and most important in my opinion it this. You added heads and a cam. Those are great for adding power. But they are great at adding power at higher RPM, not off idle. I would guess on a relative basis (same weather and conditions) your MPH improved in a big way, but your 60' times may have in fact suffered, or not improved by the same margin. Getting a vehicle off the line is where a race, or in this case your time, is won or lost.
Do you still run the stock fuel pump? Does the truck go lean on the top end? Your stock fuel pump will not supply enough fuel even with the BAP I don't think.
Do you have a converter? If not get one, and your times will be where you want them.
Who tuned it?
On the pulley front... do you have the right part? It doesn't sound like it. GM accessories have a lot of different offsets and I would be willing to guess yours isnt correct. Once installed this thing should absolutely not move on the crankshaft. You should pin it to keep it from spinning, but it should not move in.
Last edited by Vortec350ss; 09-04-2015 at 03:46 PM.
09-10-2015, 09:08 AM
#7
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There are a few things here that will make this Denali perform night and day better than it does now.
The first and most important in my opinion it this. You added heads and a cam. Those are great for adding power. But they are great at adding power at higher RPM, not off idle. I would guess on a relative basis (same weather and conditions) your MPH improved in a big way, but your 60' times may have in fact suffered, or not improved by the same margin. Getting a vehicle off the line is where a race, or in this case your time, is won or lost.
Do you still run the stock fuel pump? Does the truck go lean on the top end? Your stock fuel pump will not supply enough fuel even with the BAP I don't think.
Do you have a converter? If not get one, and your times will be where you want them.
Who tuned it?
On the pulley front... do you have the right part? It doesn't sound like it. GM accessories have a lot of different offsets and I would be willing to guess yours isnt correct. Once installed this thing should absolutely not move on the crankshaft. You should pin it to keep it from spinning, but it should not move in.
The first and most important in my opinion it this. You added heads and a cam. Those are great for adding power. But they are great at adding power at higher RPM, not off idle. I would guess on a relative basis (same weather and conditions) your MPH improved in a big way, but your 60' times may have in fact suffered, or not improved by the same margin. Getting a vehicle off the line is where a race, or in this case your time, is won or lost.
Do you still run the stock fuel pump? Does the truck go lean on the top end? Your stock fuel pump will not supply enough fuel even with the BAP I don't think.
Do you have a converter? If not get one, and your times will be where you want them.
Who tuned it?
On the pulley front... do you have the right part? It doesn't sound like it. GM accessories have a lot of different offsets and I would be willing to guess yours isnt correct. Once installed this thing should absolutely not move on the crankshaft. You should pin it to keep it from spinning, but it should not move in.
https://www.livernoismotorsports.com...cls92stg2c.jpg
Thanks.
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09-10-2015, 11:02 AM
#9
That cam isn't that big for those heads. I am running a 224/236 115lsa on cathedrals.
I think for a cam that size it needs more boost though. Mine weighs 5900 and change and with a 2800 stall still spins all four, but I am running more boost. I would have avoided the L92 heads as I feel they struggle down low with velocity and your not moving enough air to overcome their deficiency IMO.
I think for a cam that size it needs more boost though. Mine weighs 5900 and change and with a 2800 stall still spins all four, but I am running more boost. I would have avoided the L92 heads as I feel they struggle down low with velocity and your not moving enough air to overcome their deficiency IMO.
09-10-2015, 12:06 PM
#10
Formerly ScreamingL
who did the work since you are in Pa?
Cam is too large imho for how heavy that pig is, i run a 218/218 and trap 113 with similar weight to you on 12 psi
theres a awd dyno that belongs to PRL, TPG wheel base dyno is too small but the PRL should fit ya
Cam is too large imho for how heavy that pig is, i run a 218/218 and trap 113 with similar weight to you on 12 psi
theres a awd dyno that belongs to PRL, TPG wheel base dyno is too small but the PRL should fit ya
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