I almost have my long tubes installed. should be done this weekend any idea of what to expect on the dyno next week? I am getting it retuned. I am not expecting huge #s but would like to see something in the mid range. I went with the OBX ones. Thanks
Long tubes
- Thread starter mcafferty
- Start date
I would say 10 RWHP max.
I agree with Spencer, how did they fit
18.5 hp over stock exhaust.
I can't see that happening with the mods he has listed. I'm going to be optimistic and go with swthomas. , but i say more like 10-12 lbs of more tq is more like it.
Long tubes will help your bottom end the most. Couldnt tell you how mutch,
but thats were they will help the most.
but thats were they will help the most.
Somewhat true.Peak tq will increase slightly although you will experience the "take from Peter to give to Paul" syndrome , where low rpm tq will suffer ever so slightly, total Tq gain will be more in the midrange on up ( based on his current mods) The consensus is that the smaller the tube diameter on any exhaust, the more tq is produced at a lower rpm. Long tubes can get away with a larger diameter & still provide good tq, due to the consistant diameter length. Horsepower will not be as noticable, unless heads , cams and increased boost join the team. Even then, torque will increase respectivley.
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mine made 22rwhp with long tubes:banana:
I now that I have read that long tubes help with low end. Were shortys are mostly top end.
Headers on a 5.4 S/C respond better with a lot of mods.If you had the same mods as Mcaferty, then I would say you were on an optimistic dyno.
Thats true with a N/A engine with the same tube diameter as stock. Generally,the larger you go with tube diameter , the more that Tq increase moves up the rpm range.
OK that make sence.
Yea, Like a lot of guys here I dumped a lot of cash w my long tubes. With my 8 lbs, agressive tune and ported blower I can say that that I do feel a difference throughout the power band. i needed the added boost for the port job and headers. that solved my low end rpm tq tremendously. One thing I did notice is a drop in boost when I added the long tubes.... and that was before the blower porting!
If you read the sticky. I think it says the best thing you can do with your exhaust is the midpipes.
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