[Blue M5]

I've been looking cant really seem to get a real answer. I know stage 1 is ok with cats. Was winding anyone running cats on stage 2 or 3. I promised my wife I would leave the cats in well atleast the primary. I'll mostly swap out the secondary. Was also wondering will the stock fuel support E85, if so anyone running E85 and what stages?

[Hockeytyme]

Originally Posted by Blue M5

I've been looking cant really seem to get a real answer. I know stage 1 is ok with cats. Was winding anyone running cats on stage 2 or 3. I promised my wife I would leave the cats in well atleast the primary. I'll mostly swap out the secondary. Was also wondering will the stock fuel support E85, if so anyone running E85 and what stages?

In JB4 they call them maps not stages although it's similar until after map2.

Basically map1 is like a stage1 tune and you can run it on 91octane and no DP's. Map2 needs a little better octane and you can run with stock DP's as long as you aren't tracking it and driving it hard non stop in which it would overheat your cats and cause issues of them melting or breaking apart (neither is good)

Anything after those two maps I wouldn't touch with stock DP's but I'm not exactly sure what Burger Motosports take is on it.

Straight E85 is not going to work on any tune or piggy. A lot of guys are running E30-E40 but mostly on a tune where you can adjust things to adapt for the fuel. With JB4 it's a bit more tricky and most guys haven't had a lot of success running E30 on a stock tune with JB4 unless you add meth as well.

Hope that helps and GL!

[Blue M5]

Originally Posted by Hockeytyme

In JB4 they call them maps not stages although it's similar until after map2.

Basically map1 is like a stage1 tune and you can run it on 91octane and no DP's. Map2 needs a little better octane and you can run with stock DP's as long as you aren't tracking it and driving it hard non stop in which it would overheat your cats and cause issues of them melting or breaking apart (neither is good)

Anything after those two maps I wouldn't touch with stock DP's but I'm not exactly sure what Burger Motosports take is on it.

Straight E85 is not going to work on any tune or piggy. A lot of guys are running E30-E40 but mostly on a tune where you can adjust things to adapt for the fuel. With JB4 it's a bit more tricky and most guys haven't had a lot of success running E30 on a stock tune with JB4 unless you add meth as well.

Hope that helps and GL!

Thank you. Yeah I guess I'm trying to figure out what to get. Because I will not take primy cats off no matter what. So if map1 is as far as I can go then should I just get a RC and forget about it?

[Hockeytyme]

Originally Posted by Blue M5

Thank you. Yeah I guess I'm trying to figure out what to get. Because I will not take primy cats off no matter what. So if map1 is as far as I can go then should I just get a RC and forget about it?

You can run map2 as well and with JB4 you at least have that option from time to time when you want the power. RC is probably a solid option if you just want a little boost of power and be done with it. r33_RGSport can ship it to you if you go that route.

[Fuel-It!]

All BMS maps are compatible with the factory cats/exhaust. It's mostly about octane levels. BMS actually suggests keeping the factory downpipes due to minimal gains but lots of odor if removed.

[Hockeytyme]

Originally Posted by Fuel-It!

All BMS maps are compatible with the factory cats/exhaust. It's mostly about octane levels. BMS actually suggests keeping the factory downpipes due to minimal gains but lots of odor if removed.

My hand is compatible with the garbage disposal sink hole but that doesn't mean it's a good idea :P

I haven't seen a tuning company out there that doesn't require downpipes for a stage 2 tune. In this platform stage 1 seems to range from 20-22 lbs which is similar to Map1 on JB4. Map2 jumps up to 24/25lbs at least for me when it's acting as an additive map at +5lbs. The end result is about the same as a stage 2 with most tuning companies being 24-25lbs.

Using stock downpipes and running this kind of boost is probably fine for a year or so around town. But, for consistent hard driving similar to a track is not a good idea and can cause the cats to melt or break apart over time. Neither of which has a good result.

I know a few guys that ran up to 5.5lbs on map6 for months on their cars limeypride being one of them who did it on two F90s now and he never had any problems. But, he also didn't keep either car for more than a year.

[JBA87]

Do the catless DPs really smell that bad ?

I did this on my Audi and it wasn't that bad

You smelt it

But how bad is it ?

[Blue M5]

Originally Posted by JBA87

Do the catless DPs really smell that bad ?

I did this on my Audi and it wasn't that bad

You smelt it

But how bad is it ?

I dont think it's that bad, but yes it does smell. My wife cant stand the smell. My last 3 cars had no cats. So for this one I promised her I would keep them.

[Hockeytyme]

Originally Posted by Blue M5

I dont think it's that bad, but yes it does smell. My wife cant stand the smell. My last 3 cars had no cats. So for this one I promised her I would keep them.

I agree with you Blue, it's not that bad. Only at a light with the windows down and the breeze the right direction do I smell it.

Gotta keep wifey happy too!!

[Pimpsy]

To be fair, I've never heard of anyone melting/destroying their cats by running JB4 map 2.
I see it advised to run 93 octane but no where do I see it suggested they DPs are needed to safely run map 2.
I mention this for feedback as I'm about to pull the trigger on a JB4, intend to run map 2, and have no interest in DPs.

[Blue M5]

Originally Posted by Pimpsy

To be fair, I've never heard of anyone melting/destroying their cats by running JB4 map 2.
I see it advised to run 93 octane but no where do I see it suggested they DPs are needed to safely run map 2.
I mention this for feedback as I'm about to pull the trigger on a JB4, intend to run map 2, and have no interest in DPs.

I'm in the same boat. Because I'll never go catless on this car. So if running catless on map2 is strongly suggested then I might just get the Race Chip and be done with it.