[mulletman]

Increased sales?

[Megahurtz]

http://www.superchevy.com/how-to/exh...heart-exhaust/


Blackheart shorties into stock NPP exhaust dyno ^^

[Atra]

Originally Posted by mulletman

Increased sales?

Sure but when you're selling a product that WILL be third party tested..thats pretty flimsy.

[ender2664]

Originally Posted by Megahurtz

http://www.superchevy.com/how-to/exh...heart-exhaust/


Blackheart shorties into stock NPP exhaust dyno ^^

Thank you very much

[avalonandl]

9hp for headers..... not enough for that PIA install...

[cooden]

Originally Posted by Atra

I have seen with my own eyes the Blackheart dyno charts. My car has their headers and exhaust so I will soon find out if the claims are true. I have met the head of Blackheart and their engineer-super awesome dudes who are just car guys like us. Dunno why they would have reason to embellish the numbers

One reason would be to sell their product. Like mentioned already, you can take the lowest dyno number stock & then add the highest dyno number modded and then you can post HUGE gains between the two numbers. This is called sales & marketing.

[Atomic Ed]

Originally Posted by avalonandl

9hp for headers..... not enough for that PIA install...

IMO, the same can be said for the 20hp gain with long tube and installation costs.

The Blackheart shorties have their place in some states that require that the OEM cats stay in place. Yea, not much gain, but it's something. Worth it? Your call.

I'll be curious to see how they fair of a F/I car (in CA). We'll see this test soon.

[avalonandl]

Sorry- I dont believe 15 hp gains for exhaust only by Hooker. OEM system by GM leaves very little on the table.

[Atomic Ed]

Originally Posted by avalonandl

Sorry- I dont believe 15 hp gains for exhaust only by Hooker. OEM system by GM leaves very little on the table.

Hooker only claims 8 hp, not 15. That's seems to be a reasonable number for somewhat longer and bigger diameter manifold runners.

The exhaust manifold is usually the critical component of the exhaust. That's where the exhaust expands quickly and where pressure/temp is reduced at the highest rate. Granted that the rest of the exhaust system is a restriction also, but the delta pressure on the rest of the system is less as compared to the pressure/temp drop across the manifold inlets and outlet.

8 rwhp gain for reducing manifold restriction and 20 rwhp gain for reducing overall exhaust restriction are believable numbers for this car, given the great job GM did on the design.

Frankly, given the cost per hp, I don't think either one of them (shorties or long tubes) is worth it. Forced Induction folks are making over 600 rwhp on the stock exhaust and adding headers to the FI equipped cars isn't gaining much, if any, over 30 rwhp.

Headers just aren't the power adders they used to be. My old school thinking says put them on, but looking at the results (and the cost!) on this forum from adding headers has me re-thinking this.

Other people are adding them for the sound, that's a personal choice. I like the sound just the way it is with the NPP exhaust. It's sneaky with the SC under the hood.

[Fraxum]

Some Aftermarket parts may give better parts than others, But this is maybe the best of the aftermarket parts below. Real world gains with a tune starting from a stock car. These gains are from the fattest curve path of the gains:

• Rotofab with dry filter - 6 RWHP 5 lbs RWT
• MSD intake - 25 RWHP 23 lbs RWT (gains are at the higher rpm range)
• ARH 1 7/8 LTS with 3" all the way back Exhaust 10 RWHP 10 lbs RWT
• All three together - 46 RWHP 31 lbs RWT

So do not expect any gains with shortys, you already have them. With the MSD and LTs you need/want a tune. There is not much HP to be had without requiring a tune. Exhaust gains? Not much if all you get from 3" exhaust and LTs is 10 rwhp. All these numbers are from JRE.

E85 (must tune) is maybe the best HP mod.

[Megahurtz]

Originally Posted by Fraxum

Some Aftermarket parts may give better parts than others, But this is maybe the best of the aftermarket parts below. Real world gains with a tune starting from a stock car. These gains are from the fattest curve path of the gains:

• Rotofab with dry filter - 6 RWHP 5 lbs RWT
• MSD intake - 25 RWHP 23 lbs RWT (gains are at the higher rpm range)
• ARH 1 7/8 LTS with 3" all the way back Exhaust 10 RWHP 10 lbs RWT
• All three together - 46 RWHP 31 lbs RWT

So do not expect any gains with shortys, you already have them. With the MSD and LTs you need/want a tune. There is not much HP to be had without requiring a tune. Exhaust gains? Not much if all you get from 3" exhaust and LTs is 10 rwhp. All these numbers are from JRE.

E85 (must tune) is maybe the best HP mod.

Pretty sure they gained more than 10HP with 1 7/8" headers. You must be mistaken.

http://www.camaro6.com/forums/showthread.php?t=436608

[oldman]

Originally Posted by Fraxum

Some Aftermarket parts may give better parts than others, But this is maybe the best of the aftermarket parts below. Real world gains with a tune starting from a stock car. These gains are from the fattest curve path of the gains:

• Rotofab with dry filter - 6 RWHP 5 lbs RWT
• MSD intake - 25 RWHP 23 lbs RWT (gains are at the higher rpm range)
• ARH 1 7/8 LTS with 3" all the way back Exhaust 10 RWHP 10 lbs RWT
• All three together - 46 RWHP 31 lbs RWT

So do not expect any gains with shortys, you already have them. With the MSD and LTs you need/want a tune. There is not much HP to be had without requiring a tune. Exhaust gains? Not much if all you get from 3" exhaust and LTs is 10 rwhp. All these numbers are from JRE.

E85 (must tune) is maybe the best HP mod.

Good write up. LT gained a little more with a tune from the Jennety post.


Here is an engine dyno with a near equal length long tube:
http://www.corvetteonline.com/news/d...to-lt1-engine/

10 HP and really over 4500 RPM up. Very surprising in some ways.

[Atra]

The long tubes from hooker are really not bad to install...

[Fraxum]

Originally Posted by Atra

The long tubes from hooker are really not bad to install...

But are they worth it?