I was wondering, I just got rebuilt turbos and they hollowed out my cat and I have a dp and a muffler, do I need to have my ECU tuned? Or am I fine for now?

 

at wot what is your boost pattern? to play it safe i would go to home depot, get two needle valves and use them as a manual boost controller to set at 10. real cheap and they work great.
nick

 

Dude, get rid of that ghetto mod, and do a real midpipe from Rx7 Store !

 

if you are still on the stock ecu, you should look at getting it retuned. No cats is not a good idea without a remap and or boost control.

 

are you a gambling man? either control your boost or get ecu.

 

as long as your boost is 10psi or under, your fine!

 

what if I just went and got a 3" in/out cat? Would that help or should I just say screw it and get my stock ECU retuned?

 

I didn't want this to happen but the guy said he would do it for me because it would eventually hurt the turbo's AGAIN he said, but I agree, I would rather have a mp, bu then again the carb guys would never know....

 

You are seriously walking a fine line with all those mods and a stock ecu. Why did they gut the cat? If I were you, I would buy a high flow cat and be done with it. Even if you put in the Home Depot boost controller, you may still get creep.

So what was wrong with your shifter bouncing up and down?

 

The answer for me gutting my cat is above, the guy said he would. And the answer to my shifter bouncing was a broken PPF. He took a look and sure enough there was a big crack in it. So he's welding it for me. Yeah, when I go down to pick up my car I want to see if he has stock cats lying around so I could just buy it and have him put it on for me. That will be easy!

 

Ok, I have one more question. Would changing the sequential turbo system over to non-sequential setup be a safer way to relieving me having a gutted cat?

 

the boost will be more steady but it will still be too high for the stock ecu.

you are going to blow your motor I will bet anything on it. If you go wot 1 time it's over. I was boosting to 13 psi with a pettit ecu that lets you go to 15 psi and I blew my motor that was just rebuilt. Getting a stock cat on there asap is a very good idea so you can stay at 10 psi. Also do the bleeder valves and try to get the boost as low as you can until you get that computer. I'd get a pfc the retuned computers don't have any potential.

 

Crap! But I don't have any money to be spending on pfc or other type of ecu. And I don't wanna get a stock cat put on. Can you tell me how much a remapped ecu is or cheapest ecu upgrade is for my setup?

 

Stop being cheap... How does a rebuild sound. Just a little more expensive than a stand alone. Thats what your gonna need if you run all that boost with out a stand alone or ecu upgrade. If you want to add mods then you need a way to control them.

Even a profec B wouldnt hurt and cheaper. I had a huge boost spike to 15 psi and now can limit it to 7 psi if I want. You want to go fast I am sure everyone would agree you need a stand alone.....

 

just get the damn ecu. you cna pick up a pettit or M2 for about $400 on this site or other places. MUCH cheaper than a rebuild/ reman.

 

i agree w/ rxrotary, get a cheap ecu like the m2 or pettit. but i told you way back in the first post to this thread to go get the manual boost controller from hd. its a cheap and easy way to see if your able to control your boost. its def worth a try, if you still get boost creep then its time to find an ecu or put your cat back on. or you could drive around for a month or two and enjoy your car, then rebuild the engine. no offense, but you should've planned your modding steps a little better.
nick

 

OMG! I didn't plan this. Jeez, he's just doing it. Good grief please stop jumping down my throat. I think I'll just put the cat back on. It's all stock piping, just has a stock width straight pipe. I guess I'll search for an upgraded ecu, and scrounge for whatever money I have left! I found out what causes the blown engine, FUEL CUT! At 12 psi, the fuel cut kicks in and boom! Well, thanks for input.

 

Even with a remapped ECU, boost creep past 14 or 15 psi will surely result in engine death. The stock map sensor only reads up to 14.7 psi. One cold morning at WOT in 3rd gear and you will be shopping for a new motor (or selling the car).

Just put the stock cat back on for now and make sure you are only running 10-11 psi. Then save for a remapped ecu.

Jeff

 

why the hell would anyone buy an upgraded ecu such as M2 or pettie or what ever when you can pay a bit more for a aem or powerFC and beable to actually tune or make a difference in a/f ratio???
do you guys really think that these aftermarket ecus are safer then stock? do you actually think they can be possibly be tuned to your individual car/mods??? I'm sorry if I'm ranting but come on guys, think about it!!!

BTW: You never mentioned how much boost you are running, how much are you running and how are you trying to control boost. If you don't even got the homedepot manual boost controler in there (which cost about 6-10 bucks from homedepot or what ever local hardware store you have near you) and are over boosting, shame on you. It's 10 bucks for crying out loud, come on! If your still over boosting, use restrictor plates (these are also amazingly cheap, under 5 bucks to make and they work!).

 

i dont think that...thats why i am running an e6k. but it *should* be able to hold him over untill he can save up $600. this way he can sell the pettit that will "hold him over" and add that money to the $600 he saved and buy a programable ems

 

This would be true here. Well, I think I'm gonna try the home depot boost controller, I'll look into it, and if that doesn't help or work then I'll just put a cat back on. Any one know where I can get a stock cat or anything? Would high flow work or will it still make it boost higher? Just because my cat is shot, he poured little briquets out of it, they were all stuck at the end of my exhaust pipes clogging the crap out of it.

 

Spend the money and buy a used stock cat or a high flow, or invest some money in another ecu, or else you'll be putting lots of $ into an engine rebuild!

 

I always used to say I can't afford a power fc or profec b or gauges. Then when I blew my motor after just a few thousand miles on it I magically afforded another motor! So trust me you can afford it just do what you gotta do because it's way better than getting another rebuild.

People aren't trying to get down on you they've experienced all of this stuff before. With me even it was hard for me to believe or follow the local rx-7 veterans advise. I guess you have to experiece it for yourself but it's a costly experience.

 

ok well here's my next question, I'm not getting the pfc right at this moment, I will in a few mopnths, but if I were to get a high-flow cat would that be ok? Or should I just put a stock cat back on?

 

Why did you blow your motor? Was it just because of the pettit ecu? Because I am looking into getting one...now im not so sure...