Hellion tt GT500

[LTHLCHRG]

Looking to buy a hellion tt kit for the GT500.Just wonsering if anyone is running this kit,and if there are any issues with it

 

[blacknlte]

Dont thing there is anyone on here that is, but from what ive seen on other site theres no problems with the kit and it makes some nasty power right out of the box. But make sure you get the supporting parts to go with it. ie. bigger injectors, upgrade the cooling, and some one to tune it that knows what they are doing!

Jump on svtperformance.com there are a handfull of people on there. One guy is "the bull" he made 900+ to the wheels and now has upgraded his turbos and putting 1100+ down.

His 900+ 9.49 run

 

[rford426]

blacknite the vid isn't working..sure would like to see this

 

[blacknlte]

fixed it

 

[Surfstang2020]

Ive heard nothing but great things about the hellion kits as far as fitment and working issues, Im looking at getting a single turbo kit for my gt when the funds are availaible

 

[LTHLCHRG]

Dont thing there is anyone on here that is, but from what ive seen on other site theres no problems with the kit and it makes some nasty power right out of the box. But make sure you get the supporting parts to go with it. ie. bigger injectors, upgrade the cooling, and some one to tune it that knows what they are doing!

Jump on svtperformance.com there are a handfull of people on there. One guy is "the bull" he made 900+ to the wheels and now has upgraded his turbos and putting 1100+ down.

His 900+ 9.49 run

I will be putting a fore return style fuel system with 80lbs injector 3" exhaust end hellions intercooler upgrade,along with ball bearing turbos

 

[Matt D]

I will be putting a fore return style fuel system with 80lbs injector 3" exhaust end hellions intercooler upgrade,along with ball bearing turbos

Stock internals?

 

[Dex]

My buddy put it this way...

"To me, compound boost is like getin a bj from 2 girls. You can really only use one at a time"

 

[LTHLCHRG]

compound is better for street use.

 

[LTHLCHRG]

Stock internals?

for this year,will run 700-750rwhp this year and build the block in the winter

 

[JeremyH]

compound is better for street use.

How?

Its pretty much pointless for street use.

 

[blacknlte]

you can make 700 or so on the stock internals with it tuned right and for using both the turbos and factory supercharger, you get the best of both worlds!

Do have to agree with it not being a street setup...

 

[GrnBullitt08]

was that the GT500 caming like that or another car around him? That thing sounded nasty.

 

[blacknlte]

was that the GT500 caming like that or another car around him? That thing sounded nasty.

it was another car behind him, hes running stock heads and cams

 

[GrnBullitt08]

I was gonna say....damn!

 

[LTHLCHRG]

How?

Its pretty much pointless for street use.

Hellion recommends the compound set up for the street.Iwould rather have the evolutions intake instead of the blower.Try this setup this year and then possible go the other way next year.

 

[Bingo]

Leaving the supercharger on is good for low-end power, but if you're going for maximum power, it becomes a restriction.

 

[blacknlte]

Leaving the supercharger on is good for low-end power, but if you're going for maximum power, it becomes a restriction.

sorry thats not correct....

From Hellion

Q: Is the Supercharger a Restriction?

A: No, not at all. The supercharger is not a stagnant, solid piece that air has to travel around or through. Rather, the supercharger is simply doing what it does, and that's take air and essentially make it smaller. The supercharger will simply take the air that has been compressed by the turbochargers and further compress it as it travels into the engine. In fact, the turbochargers will basically help to improve the overall efficiency of the supercharger. Roots and screw-type superchargers experience a condition known as "back flow." Back flow refers to air that doesn't make it into the engine when it is compressed, and actually comes back up into the intake tract. This air is heated, and is the cause of the loud noise heard from positive displacement superchargers. When the turbos are added in conjunction with the supercharger, they help to keep the airflow directional, minimizing the amount and effect of the back flow. Also, it's important to remember that boost itself is actually a measure of restriction, so to speak. The number that we read as "boost" is positive manifold pressure, or the byproduct of the engine only being able to flow a certain amount of air through it at any given time. The air that is being forced into the engine will eventually overcome the amount of air that the engine can ingest during every revolution, and the resulting "back up" of air is positive manifold pressure, or boost. Therefore, by using the supercharger to create a higher level of pressure, it cannot be viewed as a restriction

Q: How Come the Turbos Alone Will Make More Peak Power at the Same Boost Level Then?

A: As previously stated, the turbochargers are the more efficient power adder (supercharger vs. turbo). In the compound setups, the turbo boost level is limited because the air will be compressed again by the supercharger. Therefor, 20psi of compounded boost will only be about 8 psi from the turbos and 8-9 psi from the supercharger. This means that you will see peak power characteristics that reflect the amount of turbo boost present, with low-end power characteristics of a supercharger. The total boost number is somewhat irrelevant. If we use the turbos only to create 20psi, they are in a more efficient airflow range, but will lack the low-end power of the supercharger. Also, the turbo combinations with lack the mechanical losses, however minimal they may be, which will lead to slightly higher peak power numbers.
Q: What are the Real Benefits of the Compound Boost Setup?

A: The real world benefit of a compound boost setup is average power and driveability. With the compound setup, you can still have the instant boost and low-end grunt of a supercharger, but the addition of the turbochargers will allow for a much more efficient and powerful top-end. This is referred to as "power under the curve." The average amount of power that we are able to produce with the compound systems will provide better driveability while still producing hair-raising amounts of power. Here's a quick example of how to think about it:
Let's say that we have a car that makes 1,000 hp peak, but only makes 500 - 1,000 hp for around 3,000 rpm. Now, we have another car that makes 900 hp peak, but makes 500-900 hp for 5,000 rpm. If we use a linear progression of power to calculate the average power through 5,000 RPM, the second car in question would have an average power output of about 700 hp through 5,000 rpm, whereas the first car mentioned would only have an average output of about 550 - 600 hp through 5,000 rpm. Using this equation, the first car in question has a higher peak power output, however the second car will most likely out-accelerate it due to the fact that it makes more average power over the same RPM range.

 

[Bingo]

Your second question specifically addresses the restrictive nature of the supercharger. 8 psi SC + 8 psi turbo < 16 psi turbo

 

[blacknlte]

referr to the first question