GTM Stage 2 Supercharger Preliminary Testing Results

wstar · 08-24-2011, 11:03 AM

Quote:

Originally Posted by fstrnldr

Still confused why someone would go through the time to make a long tube head but not make it equal length.

Anyway since when is it GTMs responsibility to test their products for compatibility against other non OE manufacturers offerings? Maybe they didn't feel like spending the money and time to see if a part that offers them no income from sales fits w/ their kit. Maybe there is something that can't be seen in those pictures. Or maybe it is a heat issue. The fact that the OE piece is two layer steel + a heat shield (keeping more radiated heat inside the pipe) vs the aftermarket piece which is single wall tubing with no coatings or heat shields could play a big factor.

The FI LTH come in a ceramic coating for heat shielding. I suspect the walls are thicker too, though it's been a long while since I've seen my stock manifolds. Neither GTM nor FI are responsible for cross-testing with each others' products, but I think it is reasonable to ask that FI know and disclose any effect the LTH would have on an SC setup in general, and for GTM to know and disclose any effect a cat-less or LTH exhaust flow is going to have on their SC kit and why.

Both seem to have done so, and they come to conflicting conclusions. I don't have enough personal data or expertise to weigh in any further than they have already.

Some independent parties (e.g. theDreamer) have combined them and think there's no real issue given a proper tune though. Given FI's recounting of Shumby's experience, I'm not sure I put a lot of weight in that story one way or the other, just too little hard data and not enough experimenting done.

For reference, the very bottom of the top post here has FI's conclusions: Fast Intentions Long Tube Headers are here!

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