the first person to get an Edelbrock SC on a 6.2!

[bass mechanic]

ok guys I did a little photoshop on the graph, assuming 4th gear is the accurate graph since the lines cross at 5252 I made some straight lines across to illustrate the HP and TQ figures.

I get 370 hp and 380 tq

why is is so damn difficult to post a picture from your computer but so easy from an Iphone?

[Jennabear]

The TQ and HP are scaled differently on the chart, that's why the lines don't cross at 5252, that's not an issue. The possible issue I see is about the top end surge it showed in 4th that didn't occur in 3rd, it makes me think the settings on the dyno were not the same between the runs.

This is along the same lines as to what I was thinking. Possibly two different graphs that had a scaling issue. Doesn't look like a gearing/transmission issue.

[Jennabear]

Side note, I am getting 10lbs on my 6.2L with the TVS2300, stock pulley.

[bass mechanic]

Side note, I am getting 10lbs on my 6.2L with the TVS2300, stock pulley.

What are u getting to the wheel?

 

 

Sent from my iPhone using Tapatalk

[Jennabear]

I haven't had it on a dyno, as there are no AWD load bearing dynos long enough for my Yukon.

 

Calculations say that 640HP at the crank could be very conservative. At 6000rpm, it would have approximately 75lb/min of air, so approximate 10hp per lb of air, end potential for 750HP.

[bass mechanic]

I haven't had it on a dyno, as there are no AWD load bearing dynos long enough for my Yukon.

 

Calculations say that 640HP at the crank could be very conservative. At 6000rpm, it would have approximately 75lb/min of air, so approximate 10hp per lb of air, end potential for 750HP.

so answer this, do you have the 3 lobe or 4 lobe screws? I am curious if with 4 lobes and 2300 cc if the blower has to spin the same speed, faster or slower?

I've been reading EB website and I've come to the conclusion their stock pulley is pretty close to 3"

I am speculating here but if a 4 lobe rotor is more efficient, maybe it turns at a lower speed for the same displacement. if that is true it would have less parasitic losses, running a larger pulley and more belt wrap.

I would also think it generates less heat as well.

your thoughts?

what size is your pulley?

 

also i see your in CA what part? any chance when i get my truck back we could have a little impromptu drag race?

[bass mechanic]

This is along the same lines as to what I was thinking. Possibly two different graphs that had a scaling issue. Doesn't look like a gearing/transmission issue.

i think its possible that in 4th gear at the top of rpm the wheels might be doing near 110 mph and the speed limiter may have triggered.

[iCryWheniGoPoop]

The TQ and HP are scaled differently on the chart, that's why the lines don't cross at 5252, that's not an issue. The possible issue I see is about the top end surge it showed in 4th that didn't occur in 3rd, it makes me think the settings on the dyno were not the same between the runs.

What's the point of the chart then, if the graphs are scaled differently than the chart, then the Hp/TQ #'s we are seeing are not actual.

[Jennabear]

so answer this, do you have the 3 lobe or 4 lobe screws? I am curious if with 4 lobes and 2300 cc if the blower has to spin the same speed, faster or slower?

I've been reading EB website and I've come to the conclusion their stock pulley is pretty close to 3"

I am speculating here but if a 4 lobe rotor is more efficient, maybe it turns at a lower speed for the same displacement. if that is true it would have less parasitic losses, running a larger pulley and more belt wrap.

I would also think it generates less heat as well.

your thoughts?

what size is your pulley?

 

also i see your in CA what part? any chance when i get my truck back we could have a little impromptu drag race?

 

All 2300s use the Eaton 4 lobe. Essentially each supercharger company just packages them differently. I am running a 3.2" pulley ATM.

 

I am down in San Diego, not too keen on the drag racing here in CA

i think its possible that in 4th gear at the top of rpm the wheels might be doing near 110 mph and the speed limiter may have triggered.

Speed limiter should have held the wheel speed and closed the throttle. Would have seen a massive dip in power output.

[Jon A]

What's the point of the chart then, if the graphs are scaled differently than the chart, then the Hp/TQ #'s we are seeing are not actual.

 

It's still usable, just not as nice. When looking at the torque curve, reference the numbers on the right side, when looking at the power curve, look a the numbers on the left side. While I prefer to have both lines scaled the same, people often scale them differently to make the chart look the way they want--GM even did it with the 6.2 http://gmpowertrain.com/2014_images/charts_lg/l86_chart.jpg . With the lines crossing at 5252 but the chart only going up to 5700 or so, it may have looked a bit more messy.

[bass mechanic]

OK I have NEWS! the news you have all been waiting for..

 

I talked to the head of engineering today and they will be doing a tow test over this or next week. they said they are going to try to be done a week from this Friday.

 

but the results are they got an additional 115 hp at the wheels. with drivetrain losses they say it will be advertised very much the same as the stingray at 600 hp and 624Tq FLYWHEEL hp.

as for the debate here about the dyno, he agrees the 4th gear is the more accurate number, but they do both 4th and 3rd and I will be getting a new graph overlaid with the previous graph today!

They run 2 gears because as I suspected 4th gear would cause the factory speed limiter to kick in and not get a full rpm reading, so they have to disable the factory speed limiter for a 4th gear pull, most people will be doing a 3rd gear pull for a comparison.

he said these numbers would be consistent with a 20-21% drivetrain loss which is typical for a truck with heavier wheels and tires verses a corvette.

he said the truck drives awesome! he was very impressed with its road manners and the truck itself as a whole. complimented GM for building such a more refined and capable truck to begin with. The SC just makes it drive even better.

he said the driving, shifting and everything feels just like stock until you get in the boost.

speaking of boost the truck is making about 6.5 psi of boost..

as soon as I get the dyno ill post it here.

 

edit, we also had a lengthy discussion about their kit. as you know making more power is a lot easier with less boost if you can keep the intake charge cool. they tell me they use a bigger heat exchanger (the part that goes in front of the radiator) I forget the BTU's it is rated for but the long and short is it is THE biggest one in the industry. due to the fact the truck already has a large radiator the cooler covers pretty much the entire radiator. also they said that Magnuson uses a 4 gal per minute pump, they use a 7 gallon per minute, the additional flow makes for better cooling.

 

while they do not have data from the competitors as to the number of fins or cooling area of other intercoolers, their intercooler uses as much surface area as is possible in their package. they typically run temps of 20-30 degrees over ambient after the charge passes through the intercooler.

 

I also learned that on this gen of engine the air intake temp is read at the MAF its part of the sensor itself. they have to replace the factory MAP because it only reads up to 1 bar and they also need to read actual air temp after the intercooler. so the MAP sensor incorporates an AIT and they reroute the temp reading from the MAF to the MAP so that air density can be calculated correctly.

 

no modifications are needed to the fuel system

 

and if you want to purchase a kit to install yourself they will be about 7500 bucks complete with the tuner and everything you need. the only drawback to doing it yourself is that you don't get the warranty unless it's installed by a certified shop.

 

so having said that and given the choices out there I think it is a fair statement to say that you may not get a better bang for the buck than the e-force if you want to put some boost on your truck.

[Jon A]

Thanks for all the info and keeping us updated. I’m happy to see they made use of all the extra space under the truck’s hood with a larger intercooler instead of just bolting on the Corvette version. It sounds like it is a well thought out kit.

[fondupot]

holy cool, going back a few pages, where did you have the black chrome wheels made?

[WendysOrBust]

I'm really curious as to how the Tow/Haul mode is going to work now with adding forced induction. One thing I really love about my truck is how it engine brakes when tow/haul mode is activated. Not sure how that feature would work with a supercharger added in.

I'm really curious as to how the Tow/Haul mode is going to work now with adding forced induction. One thing I really love about my truck is how it engine brakes when tow/haul mode is activated. Not sure how that feature would work with a supercharger added in.

[thetruck454]

Did they say anything about how much was left in the stock fuel system for cranking up boost or other additional mods?

 

Also something isn't adding up for power numbers. If they added 115 rwhp and you have 20% loss that's about 144 at the crank for a total crank HP of 564, not even close to 600.