What are headers?

I leave my car stock, so I don't know... :D

 

From my own experience with rotary engines, I would guess that an aftermarket fuel chip would easily do the trick at getting around 50 hp.

I would not expect you to see engines raising the redline much since 9000 is really a known SAFE limitation.

Even though you would gain 50hp at the top rpm, the bottom rpm would not change all the much to be noticed.

More porting?? The ports in the renesis are perfect and any major change would take you back to the problems of previous (old) 13B engines. I am sure you want to avoid that scene....

The most logical and noticeable change in power output would be achieved with a small turbo. One that spools quickly for the maximum low end torque and can still allow 9000 rpm without choking off the intake.

Imagine if you will an engine with around 225 ft-lbs at 4500 rpm but only 300 hp at 9000. That would certainly be within a range of dependability and still increase the FUN factor by at least 50%.

Anything more than this would be foolish for a 'street driven only' car. And you could probably get away without to much 'beefing up' of the accessories around the turbo.

 

Aftermaket rims with some sticky tires on it, maybe Toyo Proxes RA1s for street use.

I would add adjustable racing struts when they become available.

I will probably do some alignment tweaks.

At some point, I will probably replace the exhaust. But that will probably wait.

Depending on brake bias, I might play with different pads.

And I will consider an aftermarket front swaybar or custom bar.

All of the above to stay in a stock class for SCCA Solo2 and ProSolo.

I have no interest in changing the engine or rpms.

 

You actually think that you're going to be able to "chip" 50 HP out of the Renesis?

---jps

 

Perhaps he meant to type "5" :-)

 

yes, I meant to say 50 extra ponies.

My reasoning is this:

1. the porting is already giving the engine the air it needs.

2. The stock chip is likely to be 'leaned out' to promote fuel economy and prevent excess high rpm power for reliability.

3. 50 extra hp at the top end would not improve the low end noticeably.

4. Expecting more power than this is sure to cause premature failure. The engine will only handle so much power (without special internal parts) and still last any length of time.

AND one final note: Those who intend to race with this engine should consider all new and traditional modifications inside the engine to ensure its reliability. Sure the factory engine should be strong, but there are many ways to make it better but these ways will void your warranty and make your car "NOT LEGAL FOR STREET USE" in most areas.

I think most people will be pleased with the factory setup.

 

You could almost get 50hp from the previous gen audi a4, but it had a turbo with an electronicly controlled boost, which made it easy.

They are thinking that the 250 is just an artifical number and are hoping that you can unlock the real hp just by modifying a few things in the ECU. Rather optimistic, but I guess, possible. I'd think 20-30hp boost would be the max though.

 

To answer a previous question of what are headers, headers are the pieces of exhaust pipe that connect directly to the engine. As for mods, I am very overprotective and would have to go with the flame throwing securty system that was labeled my guiness Book of World Records as the "worlds most dangerous car alarm." Key my car, and go home "well done."

 

but still fuzzy, 20-30 horses is completely insane...
are there insurance or EPA ratings which would encourage an artificial HP number like that?? i mean, the lower rating for the auto is because of the revs and everything, but why hold back on a sports car like that??

 

I think with exhaust/no precats or cat (gotta love no emmisiions in florida)/intake/chip. You could probably see 40-50hp gains if its anything like previous rotaries.

 

I won't touch the car for the first 6 to 8,000 miles. I want to be sure there are no factory flaws before anything else. As far as upgrades, I'll wait to see what some of the rotary specific tuners like RX7.com, Petit, and M2 do to their cars.

 

Regarding emissions, there is an SAE paper which addresses and compares some of the side exhaust port's emission characteristics as compared to traditional peripheral exhaust port. The SAE paper can be viewed here:

http://perso.wanadoo.fr/rxsept/Image...esis_paper.pdf

Indeed, some of the reduced emissions from the Renesis will be due to the zero overlap of the intake and exhaust ports (as already mentioned by another poster) but there is also a significant reduction in HC emissions due to the side port exhaust. Basically, unburnt HCs get trapped in the trailing corner of the combustion chamber down by the apex seal. In a peripheral port exhaust configuration, that trailing corner gets exposed to the exhaust port and the unburnt HCs get dumped out the exhaust....bad for emissions. In the side exhaust configuration, the trailing corner never "sees" the exhaust port, so the unburnt HCs are kept in the chamber so they can be burnt in the next combustion cycle. The SAE paper claims 35-50% reduction in HC emissions due to the side exhaust layout.

So, while porting the Renesis for performance will probably increase emissions as compared to a stock Renesis engine, I don't think it will have quite the high emissions we used to see on the older peripheral port motors, due to the side exhaust configuration.

 

In a nutshell, very little flame-shooting if you're so inclined.

 

ah gee wiz........

those flames were so cool!!

 

I love honda math

 

Which is why I will never sell my FD rx-7. Fireballs are THE BEST deterrant for tailgaters. It's better at night because the flash lights up their whole car in my mirror :D

FD + no cats = Flame-on-demand (tm)

-pete

 

Exactly. I've never been in a 'chipped' NA car that felt any different to stock.

-pete

 

Aw, c'mon guys...show a little optimism here. You'll still be able to shoot flames, you just have to gut the cats and richen things up a bit Heck even pissed-on motors can shoot flames if "tuned" right :D