Thread: 3" exhaust on td5

Originally Posted by harro

I see no mention of remapping or any other mods for that matter so I would be very surprised if over boosting could be achieved with simply a 3 inch straight through exhaust on a td5.

I am sure if enough mods are done to turbo, inlet/exhaust and fulling it could result in over boosting in any turbocharged engine.

Paul.

Fitting a 3" exhaust to a bog standard TD5 is like taking a viagra for a night home alone....

I do have my ecu. Remapped .
The pipe has bends in it similar to the original pipe. Just doesn't have the large rear muffler and the two smaller ones.

Originally Posted by Tombie

Fitting a 3" exhaust to a bog standard TD5 is like taking a viagra for a night home alone....

Yes,
Have to agree, it would be somewhere near last on my mods list.

Cheers.

Originally Posted by noogie

I do have my ecu. Remapped .
The pipe has bends in it similar to the original pipe. Just doesn't have the large rear muffler and the two smaller ones.

I think you will find the first 'smaller one' was the CAT.
I removed the CAT and centre muffler but ended up putting a high flow muffler back in it.
The drone at 100km/h was dreadful.


Good luck with your truck.

Cheers,
Paul.

Are you happy with the set up you have now?

Originally Posted by Tombie

....

Remember - bigger sells.... Bigger lifts, bigger diameters etc..

If they could sell a 2.5" for $xxx and a 3" for $xxx+ 50% dont you think they would

Do we have to do this all again??? (it usually ends in someone having a tanty and going away for a while???)

Noboody is arguing that turbos cannot overspeed. What is being debated is that fitting a 3" pipe will cause any detrimental effects (and/or overspeed).

You cannot provide any proof of overspeed. Conversely, there are plenty of TD5s driving around quite happily with 3" exhausts and have been doing so for many years...

If fitting a 3" pipe to a 110 / 130 causes overspeed, then a 90 TD5 should overspeed with a 2.5" exhaust...

As for the suppliers. A 2.5" exhaust is cheaper to make, easier to squeeze in, lighter and smaller for shipping, etc... BUT - those on the market are no cheaper than 3" systems



Looks like these guys got it horribly wrong. Exhaust too short, too large, must produce no power and overspeed like crazy...

Originally Posted by isuzurover

Do we have to do this all again??? (it usually ends in someone having a tanty and going away for a while???)

Noboody is arguing that turbos cannot overspeed. What is being debated is that fitting a 3" pipe will cause any detrimental effects (and/or overspeed).

You cannot provide any proof of overspeed. Conversely, there are plenty of TD5s driving around quite happily with 3" exhausts and have been doing so for many years...

If fitting a 3" pipe to a 110 / 130 causes overspeed, then a 90 TD5 should overspeed with a 2.5" exhaust...

As for the suppliers. A 2.5" exhaust is cheaper to make, easier to squeeze in, lighter and smaller for shipping, etc... BUT - those on the market are no cheaper than 3" systems



Looks like these guys got it horribly wrong. Exhaust too short, too large, must produce no power and overspeed like crazy...

That old chestnut again.... You're like the JohnF of Exhausts....
Their turbo's may be specced to work in that set-up (again - wastegates play a part)...

Or it may not work really well at all - Or it may be capable of more but they havent got there yet... Your argument is pretty light on...

And yes, here we go again.... Even TURBOTECNICS who friggin make the things say that with the 3" pipe a TD5 can overspeed the turbo...

But again, because YOU didnt see it, it couldnt possibly be ****ing real could it...

I got zapped by electricity once (ok 3 times) too, but I cant prove it...

I cant prove or disprove global warming either, but plenty of people here are accepting of qualified peoples opinion on it.

And considering this - I don't, haven't, wont sell exhausts so me arguing a 2.5" vs 3" version is irrelevant. I cant benefit from it...

But what I CAN say is - I fitted a 2.5" and got performance and no overboosting/surging from the turbo.
I fitted a 3" pipe and immediately got that VERY phenomenon in 1st gear on hard take off... The engine was then detuned to prevent this rapid spool up from idle.

Unfortunately my film crew were on a RDO that day and unable to film the event for posterity.

Interestingly, there are hundreds of TD5s running around on 2.5" systems making plenty of power and happy too...

I'm amazed that 2 of the worlds premier TD5 modifiers (not me) - say its bad, and wont warranty their Turbos and thats not acceptable?!?!

If it wasn't a problem, why say anything? You're arguing its based on price... But they Turbotechnics, IRB and BAS dont sell exhaust... So benefit nothing - yet all say NO larger than 2.75"


**** IT - Lets plumb in a 4" and see how we go.....

Ha Tombie is this the case as well for a VNT turbo and hybrid turbo?

I am curious as I am looking at fitting one of these up next year.