hustler

iTrader: (6)

You should be looking at 3". Back when I had the Corrado, the 3" exhaust was the last thing I added. It went from like 380whp to 480whp just from the exhaust, removing the cat, and added spark angle.

I suspect the exhaust is your bottle-neck.

Faeflora

iTrader: (2)

I cant read and so i missed the crushed exhaus and resonator

Id say that could accout for 20-30hp. Rest could be timingz.

Btw i wouldnt jack timing without a way to check for knock. This is not the stone age.

curly

iTrader: (25)

Yeah 20-30hp would be 175-185, I would NOT be disappointed with that, and could probably find the other 10-20hp to make me really happy with a little fiddling with the MBC and timing.

Fireindc

iTrader: (13)

Threads like these make me afraid to get on a dyno, but also more determined to find out what I'm making. What do you guys think about using the dyno software that reads a log to generate a dyno chart? Anyone compare one of those outputs to a real dyno?

Braineack

iTrader: (62)

just strap on a dynojet for realsies.

curly

iTrader: (25)

Cat looks ok:



Dunno if you can tell, but there's no melted sections and I can see through it easily. Damn inner diameter is only 2.3". I don't care if the O.D. is 2.5", that's a ------- 2.25" cat if you ask me.

Gotta fix this damn thingy too. Those two center bolts on the timing plate broke off a while ago, it's never scraped until I started it up. Should be an easy fix. Might gut the plate to the bare timing marks. Or just bash it back with a hammer.

Braineack

iTrader: (62)

my 300? cell metal core:






there's maybe like 3-4" at most of length of catalyst.

Faeflora

iTrader: (2)

Curly, I have a brand new 3" metal core stainless cat with a little straight pipe on it sitting in my garage. Yours for $120 shipped.



The largest and shortest pipe is always best. It will always make a big differene in both spool and overall power.

thirdgen

iTrader: (26)

Why don't you just use a test pipe for track days/ everything else, and just bolt a cat on to pass a sniffer???

Fireindc

iTrader: (13)

about 3 hours to the closest one .. =(

I will do that though, eventually.

matthewdesigns

iTrader: (8)

^^^ Put that thing on the DynoDynamics in town when you come up for the hillclimb.

Curly, any chance you'd punch your log into VirtualDyno for a comparison?

curly

iTrader: (25)

Show me some pics! I'd probably have you send it to Artech for modification. PM some pics!

This has been suggested, and it's certainly a possibility. I already jack the car up to bolt my seat in for tracks farther away, undoing two V-band clamps and sliding in a test pipe wouldn't be much more work. The ~$200 cat and 3 v-band clamps wouldn't sit well for only using it once every couple years.

However, since I drive this on the street, I should think of it more like a straight piece of $20 pipe with v-bands that I only use for track days, as the cat would help muffle things.

Actually, ignore the v-bands, cause I'd have to send my dp back to him for modification, and I'm not doing that.

I pm'd artech. I'm pretty sure he hates me.

curly

iTrader: (25)

Sure, lemme d/l the program. Is it free?

matthewdesigns

iTrader: (8)

Yep, well donation based. Close

http://www.bradbarnhill.com/projects/VirtualDyno/

Fireindc

iTrader: (13)

I like this idea. Where is it located, and who would I contact about it? If it's reasonably priced I may do exactly that. We just put a gt2560 on my brothers s14 and he wants to dyno it as well.

matthewdesigns

iTrader: (8)

PM'd to end the threadjack

Faeflora

iTrader: (2)

Looks exactly like this, but without the flanges.

NA, miata, mx5, racing, cat pipe, off road, stainless steel

Probably costs you around 10 HP at 200hp level.

hustler

iTrader: (6)

Cat converters are for homosexuals and women. I didn't compare to a dyno, but I went from 11.5-11.8AFR on ramp runs when I removed the cat converter from my car. That's more air, son.

ARTech

iTrader: (34)

There's a good chance that the muffler shop who made the crush bent exhaust also used a chambered, not straight through, muffler. Add that to the list of bottlenecks.

You have pm.

curly

iTrader: (25)

I think I'll take it, dunno if it's being sent to Artech or not yet.

Yeah, I can't get it to work. Won't accept my MLV logs.

Lies! I has no PM.

I bought the muffler myself, it's a magnaflow straight through design, specifically for turbo cars.