JLT's 2010 GT500 Pulley & tune install & dyno test

[Tucker]

We got a hold of a well broken in 2010 GT500 with over 6000 miles on the clock already and got to work.

 

We have 3 pulley packages for the 2010 GT500.

JLT’s SCT X-3 Pulley package $749

Diablosport Pulley package $699

JLT's Pulley Upgrade Package (no tuner) $335

Clink on links above for more info on these packages.

 

Both tuner packages include a free JLT T-shirt and have options for JLT CAI, double bearing idlers and pulley removal tools at discounted package prices.

Once it was strapped down to the DynoJet dyno we made a couple base line pulls. The car put down a 450 RWHP (SAE) average, we built a quick tune and picked up 20+HP, but stopped as this customer wanted the pulley changed.

 

We let the car cool down and pulled the intake and coil covers to change the spark plugs. The Coil covers come off with a simple 10mm deep socket on the passenger side and a Torx T-30 bit on the driver’s side. Simply pull the covers off, pull a coil out one at a time and change the plugs using a 5/8” spark plug socket ratchet and extension. Gap your new plugs at .035 and put some antiseize on the new plugs threads to prevent them from sticking to the heads. Once this is done on all 8 plugs reinstall the coil covers and intake tube.

 

Next we need to attack the pulley and auxiliary idler kit. First we need to remove the belt from the stock pulley. A trick to doing this job much easier is to remove the stock radiator coolant tank. Don’t remove any hoses, just remove the (2) 8mm bolts and move tank over to the side.

Now you have easy access to the belt tensioner. Using a 3/8 ratchet (breaker bar works even better) and a short 2-3” extension push clockwise to release the belt tension and remove the belt from the supercharger pulley only. I tuck it under the small coolant line on the passenger side.

 

 

With the belt off we used our Metco pulley removal tool to get the stock pulley off. The supercharger pulleys on the GT500’s are not bolted nor do they have a key way, they are a press fit and VERY tight. This is why no ordinary pulley removal tool from Snap on or Mac will work. Before you start, apply antiseize on the large bolt and washers being used. Put the horse shoe plate behind the pulley and mount the tool like this:

03, 04 Cobra shown here, but tool is the same.

 

Using 2 large wrenches or one wrench and a ratchet and socket on the end of the bolt, start to back off the nut to put pressure on the pulley. It will be very tight, but keep steady pressure on the wrenches as not to put force up, down or sideways and keep turning the nut slowly. You will hear a pop and then the nut will turn easier. Keep turning until the pulley is completely off.

Once you have it off, reconfigure the tool to install the new Metco pulley hub. Be sure to install the hub in the correction direction, with the larger side going toward the supercharger case. Put a little antiseize on the supercharger shaft to aid in the install.

 

 

 

Hold pressure against the tool bar and slowly tighten the bolt on tool to press the hub onto shaft until it is flush with the end.

 

Before you bolt the pulley ring on, let’s install the Metco Auxiliary idler. Remove the 3 8mm bolts shown here.

 

Another tip, remove the pulley from the Metco idler bracket. This will give you more space to work with. Using the supplied bolts and spacers, attach the idler bracket and tighten it down.

Next install the supercharger pulley ring and belt. With the belt on the supercharger, push down on the belt tensioner and put idler pulley on bracket and release the belt. Bolt the pulley down and reinstall the coolant tank.

 

Once this was done, we were ready to make some power.

Diablosport just released the Predator U7141 tuner with pre loaded programs for the 2010 GT500, so we decided to check it out. Loading the tune with a Predator is easy. We selected “Pulley tune” and it did the rest. As with all tuners it uploads your stock tune onto itself and stores it so you can return to stock at anytime, then loads the custom tune onto the car.

Once it was done, we set up the datalogger and brought the car up to operating temperature. Hammer down and power jumped nearly 60 RWHP over stock to 510. Not bad for only $699 and an couple hours time.

We knew we were here to do some custom tuning with SCT, so we loaded the stock tune back in the car and began to build our custom tune. A few runs later and power was up another 10 RWHP and 9 RWTQ for a total gain of close to 70 RWHP. At $749 that’s $10 per HP! We did this with an A/F of 11.7-12.0 and very little timing. A more aggressive tune will net even more power.

 

Here are some dyno graphs and info.

First is the stock dyno run vs. 2.6 pulley and Diablosport tune.

 

We use industry standard SAE corrected numbers, but not all dyno shops do. If these were uncorrected numbers it would look like this:

 

 

Some like this as the numbers look much better, but it’s all in how you correct it. There is nothing wrong with either way, but SAE corrected numbers can be easily compared across the country in all climates.

 

Next are a few of the JLT SCT tuned runs.

And uncorrected:

 

With this huge power jump the car feel much better power wise, has great throttle response and the customer even reported he’s getting better gas mileage. Win Win Win!

If you have any questions, please feel free to call me direct @ 757 335 1940 or email Jay@JLTtruecoldair.com

Thanks for reading

 

Jay

[bpmurr]

Who developed the tune? Was it you or did Mr. Lund stop in like he has done for others?

[mustanggt500]

Tucker,

 

Thanks a BUNCH for this post! I just bought a bunch of parts from you and Lethal yesterday and today and will be doing this exact mod to my car when the drop truck brings it to my house. Out of all the mods that I bought and will be putting on my car in a couple days this was the one that concerned me the most and this write up has made it so simple and clear that I'm looking forward to it a LOT :happy feet:

 

Now to go read the write up for the SHELBY heat exchanger and all the other stuff is going to be easy Radio and Beer stuff!

 

Nic

[Tucker]

Who developed the tune? Was it you or did Mr. Lund stop in like he has done for others?

 

 

Jon's a great tuner, but he wasn't at our shop. We developed it ourself.

Tucker,

 

Thanks a BUNCH for this post! I just bought a bunch of parts from you and Lethal yesterday and today and will be doing this exact mod to my car when the drop truck brings it to my house. Out of all the mods that I bought and will be putting on my car in a couple days this was the one that concerned me the most and this write up has made it so simple and clear that I'm looking forward to it a LOT :happy feet:

 

Now to go read the write up for the SHELBY heat exchanger and all the other stuff is going to be easy Radio and Beer stuff!

 

Nic

 

No problem Nic. Enjoy the install and report back when your done.

 

Thanks

Jay

[blown5.4]

You mean I can gain 100hp at the crank by simply changing the pulley and a tune? Does this hurt the reliability of the motor and the warranty?

[Tucker]

Reliability affected? not at all. We have been doing this little mod on 07-09 GT500's for years. Heck tons have done huge blowers and major boost with no issues. This is minor in what this engine can take.

 

Warranty is up to the dealer. We have laws to protect us and dealers need to prove the problem with the car is a direct result of the parts installed.

 

You always have the option to return to stock. The tune is easy and we sell stock size pulley rings to bolt on to the Metco hub. Stock boost, stock tune...

 

Thanks

Jay

[lawdude]

You mean I can gain 100hp at the crank by simply changing the pulley and a tune? Does this hurt the reliability of the motor and the warranty?

 

 

 

Will more power, more stress, and more heat affect reliability? Nah, the more of each the better.

 

Will taking 'er in with engine/power train damage and with power mods attached affect the warranty? Nah, Ford'll be glad to cover it.

 

Would I let all that keep me from modding the engine? No way!

[bpmurr]

You mean I can gain 100hp at the crank by simply changing the pulley and a tune? Does this hurt the reliability of the motor and the warranty?

 

 

Considering Ford Racing has two packages that makes even more power it's not going to hurt the motor. Now if you have a bad tune that's another story. The warranty pretty much goes out the door unless you return it to stock. Some dealers are more flexible and will file things under warranty. Right now they are looking for any work. Even warranty work.

[GAFSoldier]

Hey guys I want to give you some input about the new 2010 GT500 tune from JLT Performance because it was my car that he use to build the tune.

I had get before a tune from a other vendor and I was NOT really happy with it (not much power and not really safe ) so I had ask Jay if he can make one for the 2010 like he did before for the 07 - 09 GT500's and he only say "give me your car for some hours and i will do it"! First we had look what the car stock can bring and what with the other tunes that are on the market + the one I had already and I mean the real numbers and then he start from the beginning and I was really suprise about how good he is. He not only had build a tune after some hours that had give me more power and is also safer, he also had give me 2 1/2 miles more per gallon. I love the new power and the better throttle response.

 

Go on Jay, can't wait what you will bring out next time.

[Tucker]

Thanks for the feedback Tibor, I'm glad your happy with the car.

 

Next time your here we will test the new S&B filters we have.

 

Yes, coming soon. Replacement air filters for your 2010 GT500.

 

Thanks

Jay

[2nd2none]

placed my order last night/this morning and didn't think about it until after the order was placed but what tunes comes loaded on the SCT X3? I replied to my order confirmation email but was thinking maybe you'd see it sooner on here. Order No: 5378.

I've already got your intake tube and also have the Roush offroad exhaust. would need a 91 octane tune.

thanks,

Jason

[Tucker]

placed my order last night/this morning and didn't think about it until after the order was placed but what tunes comes loaded on the SCT X3? I replied to my order confirmation email but was thinking maybe you'd see it sooner on here. Order No: 5378.

I've already got your intake tube and also have the Roush offroad exhaust. would need a 91 octane tune.

thanks,

Jason

 

No problem and thank you for your order.

I will set you up with a custom tune for the 2.6 pulley, 91 fuel and the off road exhaust.

 

Let me know how it feels when you do the install.

 

Thank you

Jay Tucker