[eurojulien]

Sorry if this has already been covered but can you safely run a downpipe with no tune in our cars? Will it just result in a check engine light or are there limp mode/etc issues?


Thanks!

[PR3CI5N]

You'll have the SES light on at all times but no limp modes. If you're looking for more power your best bet is to add a tuner like a JB4. DP's will add sound but without a tune you'll practically feel no power increase. I'll also add, the JB4 alone will make your car sound more aggressive. Especially with the CANflap option.

[Puerto Rican 335d]

eurojulien can bench flash with JR and Renntech and delete EGR/SCR/DPF at the same time make sure you get the EGR plugs from IAKNOWN. Im currently at 374 whp and 474 wtq, there are others that have more gains than I have go for it . I haven't had any codes come when i deleted the alphabet soup

[eurojulien]

Originally Posted by PR3CI5N

You'll have the SES light on at all times but no limp modes. If you're looking for more power your best bet is to add a tuner like a JB4. DP's will add sound but without a tune you'll practically feel no power increase. I'll also add, the JB4 alone will make your car sound more aggressive. Especially with the CANflap option.

Wrong motor

Originally Posted by Puerto Rican 335d

eurojulien can bench flash with JR and Renntech and delete EGR/SCR/DPF at the same time make sure you get the EGR plugs from IAKNOWN. Im currently at 374 whp and 474 wtq, there are others that have more gains than I have go for it . I haven't had any codes come when i deleted the alphabet soup

Yeah, I just wanted to drive the car for a while before I got the tune

[Mik325tds]

I did get a limp home message, but it says you may continue to drive the car. See this post:
http://www.e90post.com/forums/showpo...1&postcount=44

[2deerwhistlers]

I wouldent advise running the downpipe with no tune.. I've never tried but I imagine it's a horrible experience

[floydarogers]

The main reason you need a tune is to prevent a turbo over-speed and consequent over-boost. This was a big reason that the people with downpipes (which eliminate the DPF) ended up with the tuner they're with - one guy wouldn't sell dp's without a tune, as a customer-service thing.

Although a couple people have played around with it and concluded it's not guaranteed to happen, you don't want to torpedo a $25K motor.

[TLO03]

Ok how about install tune , then drive to shop for install.. Even though I have access to shop and car could stay indefinitely, I just hate to be a bother to the owner..

[eurojulien]

Originally Posted by floydarogers

The main reason you need a tune is to prevent a turbo over-speed and consequent over-boost. This was a big reason that the people with downpipes (which eliminate the DPF) ended up with the tuner they're with - one guy wouldn't sell dp's without a tune, as a customer-service thing.

Although a couple people have played around with it and concluded it's not guaranteed to happen, you don't want to torpedo a $25K motor.

My main concern is about the post combustion injection cycle shooting considerable diesel onto all the sensors downstream of the DPF or the car going into limp mode from not having an operable DPF. Sounds like neither will be the case, just many fault codes and perhaps less power.

[floydarogers]

Originally Posted by TLO03

Ok how about install tune , then drive to shop for install.. Even though I have access to shop and car could stay indefinitely, I just hate to be a bother to the owner..

IIRC, this was discussed (in another thread) and the consensus was that it was ok. Beware, however, that not every shop, even many shops that do tuning on gas cars, do not have the capability to break the encryption on the DDE and to flash it. It requires special knowledge and capabilities. For instance, many people are removing the DDE and FedEx'ing it to their tuner.

[Yozh]

Originally Posted by floydarogers

You don't want to torpedo a $25K motor.

I think motor will live. Turbos on another hand may not, but they are not too difficult to rebuild, plus another excuse to upgrade or hybridize them.

[TLO03]

Originally Posted by floydarogers

IIRC, this was discussed (in another thread) and the consensus was that it was ok. Beware, however, that not every shop, even many shops that do tuning on gas cars, do not have the capability to break the encryption on the DDE and to flash it. It requires special knowledge and capabilities. For instance, many people are removing the DDE and FedEx'ing it to their tuner.

I was totally talking about sending the dde for flashing then driving a tuned car with stock,DP to the shop ..