Yes today my RX-8 header system was putting to the test against the stock exhaust manifold. Baseline was 196 hp@8500 rpm with stock manifold. Prototype header made better results: 202 hp@8000 rpm! That's a gain of +7 hp at cranc at 500 rpm lower rpm. Now my "Tig Guru" Peter is making a new one of stainless steel with equal length primaries. I hope to see a solid +10 hp of the "new" header when it's finished. If everything goes the way i plan i will sell the header parts to Usa.

/Lasse

 

You should really post the dyno sheets. Other members are going to call you out on it. I promise.

 

and some pics

 

if its true. PROPS ahhah get it going soon!!! im running out of things to put in my car to stay n/a. good luck

 

a proper log manifold will make just as much performance, be less costly to build, and radiate less heat into the engine bay ...

 

Hi guys! I have all the hard data in the RotoTest computer and i am first gonna do the curves with log manifold and header style. Just be patient i will upload here. I have now driven over 200 km with the new header and it feels stronger every time you floor it! Maybe i am gonna do a second prototype header that my old "piston" guru Roger will try to made for me. I keep you updated!

/Lasse

 

fwiw, hub type dynos will read high compared to dynos that work off the tire contact face because you lose the wheel inertia and tire friction. Your 202 hp reading would be approx. 192 on a Dynojet, a Mustang dyno would be around 185

 

Ok thank's for the info!

/Lasse

 

whats up with this header any word?

 

yeah, how 'bout them results/pics?

-Cody

 

I might be retarded at math, but isn't 202-196 = +6 hp. Not to be nit picky. Those are nice results.I think it's plausible. Other firms have gotten about +3 hp from some standard designs, so +6 hp doesn't sound like a stretch on a custom Renesis unit.

 

I think he is comparing the results at 8000rpm for the stock run. The 196 was at 8500 stock. The 202 was at 8000rpm with the header. If my math is correct that should mean he got 195 at 8000rpm. Yep a dyno sheet would be helpful along with how the data was recorded. Is 202 at the wheels with the tires on or at the crank (assuming that is a calculation) or at the hubs?

 

Sounds good but will we be able to afford it? How bout a price.

 

you aren't listening, it doesn't make any difference

even my manifold doesn't make any power difference except that it drops a chunk of weight off, a big drop of weight is all you can get out of an exhaust on an unported Renesis

the entire OE exhaust system (manifold, catpipe, catback muffler) weighs 79 lbs, mine ways 26 lbs; a 53 lb drop

 

Team , I thought you reported it did make more power with your manifold ?

 

initially we found that to be true (as Lasse is reporting), but we discovered later that the OE parts can make the same power. I 'm not at liberty to say why/how yet, but I have seen a bone stock RX-8 put out near GrandAm power levels at the rear wheels

I reported way back when that my goal was to lose weight without losing power, I'm down at 2700 lbs with full interior and the original bodywork, unfortunately I'll have to add a few pounds back because the exhaust won't meet the sound limits imposed at the area I relocated to, some extra pipe and muffler(s), still trying to determine the best course of action, I'll be losing a few lbs too on some other mods so it may be a wash