|05-02-2006, 11:09 PM||#1|
Join Date: Aug 2005
Location: Portland, OregonVehicle:
06 CGM STI SM#17
Now with alot less verve!
Manifold and Header Dyno Comparo results
We bought all the stuff for a dyno comparison (and road spool logging) of the following items:
1. stock manifold (a stage 2 06 STi) (free)
2. IOTA (Gotpnp.com) ported manifolds and crosspipe ($160+shipping+core)
3. Crucial Racing ported and coated manifold and coated Injen crosspipe (~$500+core)
4. Perrin's new Equal Length headers ($779+shipping)
5. Gruppe-S un-equal length coated headers ($575 shipped)
The following folks together contributed over 3/4 of the monetary costs of the dyno:
1. Unibomber ($20)
2. JitenShakun ($5)
3. Senortighto ($20)
4. SilverSurfer04STi ($20)
5. modaddict ($10)
6. evodon84 ($10)
7. Verc ($10)
8. Crucial Racing ($20)
9. TylerTR ($10)
10. Freon ($20)
11. Tucker63 ($20)
12. EKW ($10)
13. KipA ($10)
14. WolfPlayer ($10)
15. JBlaine ($28.49)
16. Reid-o ($15)
Q: Why different days?
We dyno'd after we got there with all the learning the car could have done (several weeks). We then, for a last run, reset the computer (not shown above). The car lost a bit of power and torque (~10 tq/hp). This is significant enough to us that we'd like to let the car learn each of the manifoldsheaders through a day or two of pretty hard driving. We are using Cobb's standard stage 2 map. If we changed the manifolds out on the dyno for one big Manifoldapalooza, we would have to reset the computer each time, and we believe this will produce inaccurate results...
All logs are contained in the following post:
Dyno graph key:
RunFile_002 - Stock
RunFile_006 - IOTA
RunFile_011 - Crucial and Injen
RunFile_016 - Perrin Equal-Length, non-coated
RunFile_020 - Gruppe-S UnEqual-Lenth, coated
I can post individual comparisons as requests come up, but those results should give you the data in a quick hit.
A opinions on the results:
- As the money goes up, so do the results. THere were no extreme values in comparison to others. Each cost seemed to buy you incrementally more power.
- The only hit to spool was the classic unequal-length headers. I suspect under hot, demanding conditions, the system could get hot and would make the hit to the spool less.
- Spool is effected almost entirely by the ability of the system to keep heat in the exhaust, and the fittiment of the system so as to prevent leaks.
- For the same results, the Crucial setup or the IOTA porting with an Injen crosspipe offers stock-like fittiment and probably VERY few issues come warrantee time.
- The Perrin offer top notch results and top notch construction at a top-notch price (especially after coating and wrapping). The downside/upside is the change in the sound of the car. I, personally, like it. But I have no aversion to sounding like a Honda and no special attachment to the Boxer sound. Others certainly may differ. If I need to listen to a lope, I have a big-cam Chevy LS-1 in the garage The Perrins make the car a bit quieter also, in my non-scientific opinion. Certainly less resonant on the highway.
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