Hey everybody, this is my first post and i have a black Evo 8. got it this past sunday an its amazing. anyways, i was wondering how a turbo back full exhaust with no catalytic converter affected the car interms of getting a Check Engine Light (cel) and then if it does get a CEL will the car run bad or rich or will it be the same ecu program? i see they make complete downpipes and cat delete pipes but i dont see any remarks about cel's. thanks yall

oh yeah, up coming mods are-
3inch turbo back w/ hiflow cat
ext. waste gate
elect. boost controller
intake

lookin for the max power i can get out of the stock turbo, hopefully mid 300's.

in the late future -
E-manage
larger injectors
25g turbo

later yall

 

Hi,

Here is Dave Buschur's comments:

"The next mod was the largest surprise of all. We LOST HP but gained peak torque with an offroad pipe. This is the first time I have seen a turbo car make more HP with a cat than without. We think the OBD2 is messing with it as we got a check engine light almost immediately. Still, 1.6 hp lost with 7.3 ft lbs gained."

You might want to consider a high flow CAT unless a CEL workaround is available from the folks who sold you the TB exhaust.

Also, why an external waste gate?

Speedlimit....

 

Because he wants to blow up his evo after he slams it with H&R lowering springs.

 

Hey Coolguy,

When you getting your EVO?

Speedlimit.....

 

As soon as I can get it at MSRP. I'm dying man.......i drove TaiwanEvo's evo last night for the 2nd time. Just seeing it give me chills. ANd it's blue. I find myself pacing around back and fourth....my life feels boring. LOL. I'm putting my eclipse for sale this week. If and when I sell it, I'm going to get a rental car. I think I might buy my evo out of state like in texas or missouri and have it shipped to so cal. The whole paperwork over mail thing kinda scares me. I spent a couple hours today calling dealers in CA. The lowest I got was 2500 over. I've got dealers calling me telling me they have this new one in, and that new on in but everytime I ask there's like a 5K markup. Hopefully soon speedlimit, I'm really having withdrawals here.

 

The dealers will not "deal" on the phone. Do what I did. The one I had a deposit on was not getting a white one w/o sunroof so I saw a post here that a white one w/o sunroof was at a local dealer. I called and they had a 3K markup. (Call ahead and have a salesman epect you). I walked in with my check book and said I will buy the car today and want MSRP. Went thru the stupid salemanager wants your business BS and they came back 1k over. I said here is my cell phone number and my 4 favorite letters are MSRP. I didn't even get out the door and $600 over for the fugly pinstriping they put on the car. I said $200 for putting the pin striping on and $200 for taking it off. Deal.

Go get'em....... this weekend cause it is the end of the month!

BobP

 

oh and im gonna put the external wastegate to make sure i dont get any boost creep/ boost spike/ and more flow. also im gonna put it to get ready for a whole new turbo - like i said 25g is on the way in the near future.

 

 

I'm not hating. I'm just being realistic. There is so much potential for the evo8 with the stock turbo. Sticking a large turbo in there is going to ruin a lot of the balance the car has, especially of you plan on still rally racing it. Imagine rounding a hairpin turn and stomping the gas just to find out you have a ton of turbo lag. Just a few mods takes the car into the 12.5 second 1/4 mile range. Im sure some more tuning can take you to the low 12's on the stock turbo, which is a very good turbo.

I've met a bunch of bunch of people already that want to put turbo upgrades in their evo and lower them. I've even been asked about body kits. I reallly think people like that are better off buying an eclipse gsx/talon tsi because then it will serve your purpose much cheaper and you still get AWD. You'll save an allocation for someone that really likes the car for what it is.

So, as a word of advice......make the turbo upgrade a last resort. Modify all the surrounding components and get a boost controller. You'll save a lot of money and you might be satisfied.

As for me, I'm buying the evo because I dont want something I need to totally mod to make it fast and great handling. It comes stock from the factory. And adding mods makes it even better! Ok, I dont know where I'm going with this so i'm done.

 

PS - Sorry if I came off soundling like a hater.......I'm frustrated cause I just want an evo already. At the moment I was thinking "if you dont know about the car then why are you buying it". I guess I thought it's kinda ignorant to want to get H and R springs and a 25G turbo. Especially the springs......that may actually ruin the handling and rigidity of the car. If you want to lower your evo, TEIN coilovers are the best route to take. Claudius is the expert in this area so i'll leave it to him to counsel you.

You'll find these boards a great resource.

 

wow i come to this site thinkin, cool these guys have my car and should offer me some good insight, but in my first topic i get ONE related post that was very informative and the rest a bunch of off topic stuff.....

cool guy i undertand what ur saying, but dont flip out on me cuz you assumed i dont know the car. ive been thinkin about that list of mods for a year now. and besides the ECU fix for a possible CEL, those are the exact mods you need to get the maximum from the stock turbo. i wanna do exactly what u said, get the max from the stock turbo, which is exactly what i said as well.
like you said, once i have some mods then i very well maybe satisfied, but until then who knows. everything i want to do now is just speculation and anxiousness. shiet do i really wanna upgrade the car already when i havent even been past 4000rpm? or know its stock potential?

this is all online conversation, dont take it to heart man.

read the starting thread, i said i wanted to make use of the stock turbos full potential then in the future would come the 25g. maybe it wont be a 25g, maybe a 20g, i dunno but some sort of turbo upgrade. and yes i know their will be lag (you assumed i didnt know that? or you were just reminding me?). but like i said, i will be making use of the stock turbo and trying to ge the most out of it.

i understand the whole dont use lowering spring thing, but im just trying to understand if they are as bad as yall make them seem? cuz i want to keep a stock ride, i just wanna eliminate a lil front fender gap. i always thought that lowering springs were the best way to go, especially if u get some from a respectable company like h+r or eibach. 1,600 in suspension isnt necessary to me, like many others i LIKE the stock ride alot. i guess i'll wait for more companies and a wider selection to become available interms of springs and matching shocks

claudius, if i have to explain the point in using an external waste gate then maybe u should expand your knowledge to cover more areas than just suspension.

im lookin forward to comments, but hopefully more about fixing the resulting CEL that comes from using no cat.

 

I doubt he needs explanation on the point in using an external waste gate. He's asking for clarification on how an external gate increases airflow as was suggested in the original post. It's a valid question. External gates are a great way to control boost accurately, particularly in high boost conditions. But increasing airflow?

Back to the topic...I've never seen such a picky Mitsu ECU with regards to cat efficiency checks. But if Buschurs says the light came on after removing the cat, I gotta believe it. The ECU, as you probably know, is checking for rear O2 cycles in relation to front O2 cycles to ensure the cat is working properly. If you remove the cat, the rear o2 does not read properly and the ECU freaks, although I've not seen on that actually pulled power out as a result.

There are a couple ways to fix it. One is an ECU upgrade (which isn't likely for a couple months) and the other is to get one of these rear O2 simulators that fake the rear O2 signal so the ECU gets back what it expects. The problem with the fake signal generator is that the EVO8 ECU has already demonstrated an unusual sensitivity to rear O2 response, so there's no gaurantee one of these simulators will be any better at fooling it.

And, of course, there is the point that if replacing the cat with a straight pipe really did loose power, then why replace it in the first place. At least for a while, exhaust pressure isn't likely to be the big holdback on the car. You can get a decent improvement just focusing on A/F and ignition advance and slight boost increases.

Thomas Dorris

 

Hi,

"wow i come to this site thinkin, cool these guys have my car and should offer me some good insight, but in my first topic i get ONE related post that was very informative and the rest a bunch of off topic stuff....."


That was my fault and I should have PM'd Coolguy. You will also find that most threads rarely stay on topic; I guess our attention span is just not that long. So, don't take it personal.

The owners manual has several BOLD cautions against lowering the EVO suspension.

Have fun!

Speedlimit.....