Help, Cobb Stage 2 breaking up at high RPM

Ruff Ryda · Nov 6, 2009, 07:04 AM

I'm running Cobb HKS 93 oct stage 2 map. My mods are just a panel filter, UICP, pulled the pill (I tried putting it back in because I was slightly overboosting, but I had the same results.) and AP.

I'm getting a lot of breakup that starts at about 5500rpm at WOT. I'm thinking plugs are possibly getting weak, but I just don't know. I'm also getting tons of black smoke during the breakup, so I don't know if it is from overfueling or misfire.

Any help would be great. Thanks.

Sharkbite2000 · Nov 6, 2009, 07:10 AM

probably going super rich and turning off the spark. Pull out the plugs and check the way they look see if it's all black.

Ruff Ryda · Nov 6, 2009, 07:20 AM

Quote:

Originally Posted by Sharkbite2000

probably going super rich and turning off the spark. Pull out the plugs and check the way they look see if it's all black.

That's what I was thinking, but I'm somewhat of a rookie when it comes to this stuff. I'll try to do that in the morning. Thanks!

cool_g_83 · Nov 6, 2009, 11:18 AM

Are you running a turboback exhaust as per the instructions for a stage 2 map?

jeangtd · Nov 6, 2009, 11:26 AM

Quote:

Originally Posted by cool_g_83

are you running a turboback exhaust as per the instructions for a stage 2 map?

+2

mrMTB · Nov 6, 2009, 06:52 PM

Yeah, looks as if you should have read the stage II requirements a little more closely... Put the pill back in, and reflash to HKS Stage I.

raytrix · Nov 7, 2009, 12:12 AM

A minimum of a catback + test pipe is required for a stage 2. You don't necessarily need a DP upgrade as the stock one already flows very well.

Ruff Ryda · Nov 7, 2009, 06:15 AM

For all that don't know, Stage 2 does not require the exhaust system(per Hollywood).

I have read the instructions and am fully aware of what cobb states is required.
It has been verified by several other people and tuners that the stage 2 is safer without the exhaust and not absolutly needed.

RobY · Nov 7, 2009, 07:46 AM

Well, some people are obviously having problems running a stage II map on a stage I equipped car. So maybe there is something to COBB's recommendation...

Ruff Ryda · Nov 7, 2009, 07:50 AM

Quote:

Originally Posted by RobY

Well, some people are obviously having problems running a stage II map on a stage I equipped car. So maybe there is something to COBB's recommendation...

lol Maybe.

Do you have any history with the AP?

LaXGSR · Nov 7, 2009, 09:35 AM

Why don't you call Cobb directly? There has to be a reason they have a stage 1 versus stage 2 map right? It "might" be ok for "some" cars to run stage 2 without an exhaust, but I would guess that in general, it's safer and better to run the stage 1 map. Try stage 1 and see how it runs.

Ruff Ryda · Nov 7, 2009, 10:12 AM

Quote:

Originally Posted by LaXGSR

Why don't you call Cobb directly? There has to be a reason they have a stage 1 versus stage 2 map right? It "might" be ok for "some" cars to run stage 2 without an exhaust, but I would guess that in general, it's safer and better to run the stage 1 map. Try stage 1 and see how it runs.

Getting ready to flash stage 1 here in a few.

lowkey · Nov 7, 2009, 10:59 AM

Stage 1 - Intended for an otherwise stock 2008 Mitsubishi EVO X GSR vehicle with a stock or cat-back exhaust

Stage 2 - Intended for an otherwise stock 2008 Mitsubishi EVO GSR vehicle with full turbo back exhaust system

Which part of “full turbo back” don’t you understand?

Ruff Ryda · Nov 7, 2009, 11:55 AM

Quote:

Originally Posted by lowkey

Stage 1 - Intended for an otherwise stock 2008 Mitsubishi EVO X GSR vehicle with a stock or cat-back exhaust

Stage 2 - Intended for an otherwise stock 2008 Mitsubishi EVO GSR vehicle with full turbo back exhaust system

Which part of “full turbo back” don’t you understand?

Edited.

I am very aware of what cobb claims that you need to run stage 2.

This is the type of response i was looking for.

Originally Posted by hollywood_X
Also when running stage 2 without the "Requested" modifications that Cobb lists you wont get the full benefits from the tune.
You gave a lot of down low grunt but in the upper rpm's at higher gears the exhaust backpressure will start effecting you.
Getting a good cat back will solve the power loss and studder that you are experiencing.

EVOXMAINE · Nov 7, 2009, 12:20 PM

mine does it with just stage 1 it doesn't have anything to do with stages or turbo-back / stock. It must just still be getting far to much fuel up top... wish I could get rid of this so I can haul ass all the way to redline!!!