ira11y wrote:Matt that's an interesting choice of dump pipe design, may I ask what you hope to achieve by restricting the flow straight after the turbo?
I believe the turbo outlet is 2 3/4" can anybody confirm that spec? should have measured yesterday while I had access DOH!
IMHO most turbos will perform better with the least amount of restriction at the dump pipe, although some claim issues with over boost on the D4D, I believe that's more to do with the ability to close the waste-gate fast enough than an exhaust issue.
On a traditional (read old school, and I'm talking mid 80's -90's) waste gate we used to increase the spring tension very slightly to over come the problem (we also used to feed gas in front of the turbo to keep the spool speed up but that's another story ) . On the D4D its electronically controlled so not as easy to modify.
However a decent muffler in the system should be more than enough to overcome any potential problem. We are after all only talking about a max of about 4500rpm here not 9000rpm of gas flow. We could do the maths to get the amount of potential airflow but I CBF on a Sunday night.
I believe most of the limp mode issues we hear about are from vehicles running straight thru 3" systems where there is almost no restriction at all. I am not in favour of a complete straight thru exhaust, apart from the noise (signs I am getting old!) the difference in performance to having a muffler will be less than 1Kw. If you can feel that difference in your daily driving you are doing way better than me. And giving up 1Kw to avoid an over-spool and limp mode kicking in seems a fair trade off.
The only other solution would be to by pass the electronic control of the waste gate, you could use something similar to a sprint booster to speed up its movement, but its likely the stepper motor would fail a lot quicker with the extra load.
viney87 wrote:hi europalife,
I would be hoping they give you a wire for a faulty product
europalife wrote:ira11y wrote:Matt that's an interesting choice of dump pipe design, may I ask what you hope to achieve by restricting the flow straight after the turbo?
I believe the turbo outlet is 2 3/4" can anybody confirm that spec? should have measured yesterday while I had access DOH!
IMHO most turbos will perform better with the least amount of restriction at the dump pipe, although some claim issues with over boost on the D4D, I believe that's more to do with the ability to close the waste-gate fast enough than an exhaust issue.
On a traditional (read old school, and I'm talking mid 80's -90's) waste gate we used to increase the spring tension very slightly to over come the problem (we also used to feed gas in front of the turbo to keep the spool speed up but that's another story ) . On the D4D its electronically controlled so not as easy to modify.
However a decent muffler in the system should be more than enough to overcome any potential problem. We are after all only talking about a max of about 4500rpm here not 9000rpm of gas flow. We could do the maths to get the amount of potential airflow but I CBF on a Sunday night.
I believe most of the limp mode issues we hear about are from vehicles running straight thru 3" systems where there is almost no restriction at all. I am not in favour of a complete straight thru exhaust, apart from the noise (signs I am getting old!) the difference in performance to having a muffler will be less than 1Kw. If you can feel that difference in your daily driving you are doing way better than me. And giving up 1Kw to avoid an over-spool and limp mode kicking in seems a fair trade off.
The only other solution would be to by pass the electronic control of the waste gate, you could use something similar to a sprint booster to speed up its movement, but its likely the stepper motor would fail a lot quicker with the extra load.
Irally you seem to have a bit of knowledge on this topic and welcome anyone else's feedback. I have a 2006 hilux auto and a year ago I had the steinbauer and taipan 3 inch exhaust installed. I had major issues on a road trip from Brisbane to Port Macquarie in NSW. It went into limp mode on every incline. It took forever to get there!!! After looking into several problems it' was finely narrowed down to the steinbauer unit. Steinbauer to their credit were very helpful and it was sent back to them for retuning and they said the issue was because of the 3 inch exhaust I was running so they made adjustments to the unit. I didn't think much of it at the time because while steinbauer were helpful I just thought they were offloading the problem. I rang taipan and of course they blamed steinbauer. I'm not overly mechanically minded so it's hard to work out who has the correct facts. Now it made a difference for 99% of the time however after just arriving home doing the same trip it went into limp mode twice. Generally around speeds of 80 to 100km/hr and going up a hill. As soon as I accelerated to hold speed it went into limp mode. Kind of scary when you have trucks up your tailgate. It's also a concern because I pick up our caravan this week and I'm worried under load it will happen more which puts my family at risk on the road. So the question is irally do I get a different exhaust or just disconnect the unit. I will be calling steinbauer tomorrow as previously they said if this didn't work they had another cable (I have no idea what it does) for $900 that can be connected that will 100% fix the problem. It's a gamble to spend another $900. Any feedback appreciated.
Users browsing this forum: No registered users and 5 guests