DSR Turbo/manifold install

[marmel]

I've spent the last few days installing my turbo. I will write up a full review next week when I have got everything finished off and tuned.

Until then I have a few questions.

I can currently achieve a fairly constant 8psi when accelerating. I started out with about 5psi but have shortened the wastegate actuator rod to up the boost. Can I keep doing this until I get to where I want to be, which is around 10-12psi? If not I guess installing a boost tap would be the way to go?

Anyone running a straight pipe without any mufflers? I was suprised by how quiet it is keeping in mind I only have a 1 foot 2.5" dump pipe attached at the moment! I am thinking of running a 2.5" mandrel bent straight pipe.

[Shane]

I have a 3" mandrel exhast from turbo to tail pipe,no muffler at this stage.can hear turbo whistle even at idle.sounds great under boost

You well need to run a boost tap,cant keep loading the waste gate spring up.

under load I can get 10psi @ 1600 rpm

max boost I have set 16-17psi,goes pretty good IMO every thing else is std

Shane

[darinz]

Don't fit a 2.5" exhuast as you will regret it and will want to fit 3" later. Go straight with a 3" on a TD42.
I have always run a simple resonator to take bark out on a 3" system. The turbo does most of it and plenty run no muffler.
So with nothing it will be OK but with a resonator I think they sound better.

In theory you can keep shortening the wastegate actuator rod until the WG doesn't open at all but a bleed tap, boost controller etc is a better idea. An electronic one would be best as that will allow boost to get to pressure quicker but it is the dearest option.

[marmel]

I've seen a lot of posts about the 2.5" vs 3", especially on the aussie patrol sites.

The outlet on the turbo is 2.5", I can't quite see the logic in going 3" from there back?

I think having a 2.5" mandrel bent system with no mufflers will be OK for my purposes, I'm not looking for huge power here.

[flyingbrick]

I've seen a lot of posts about the 2.5" vs 3", especially on the aussie patrol sites.

The outlet on the turbo is 2.5", I can't quite see the logic in going 3" from there back?

I think having a 2.5" mandrel bent system with no mufflers will be OK for my purposes, I'm not looking for huge power here.

The question is WHY would you run 2.5 over 3"

plenty of pro's for 3", no cons.

turbos want as little exhaust restriction as possible. Every bend in that exhaust is a restriction and going 3" minimizes that.

even if you want the same peak power- it can help your spool too.

[marmel]

I've seen a lot of posts about the 2.5" vs 3", especially on the aussie patrol sites.

The outlet on the turbo is 2.5", I can't quite see the logic in going 3" from there back?

I think having a 2.5" mandrel bent system with no mufflers will be OK for my purposes, I'm not looking for huge power here.

The question is WHY would you run 2.5 over 3"

plenty of pro's for 3", no cons.

turbos want as little exhaust restriction as possible. Every bend in that exhaust is a restriction and going 3" minimizes that.

even if you want the same peak power- it can help your spool too.

I hear what you are saying but I don't think there will be bugger all difference in power for this type of motor between 2.5" and 3".

Here is a quote from a turbosystems engineer at Garret.

"As for 2.5" vs. 3.0", the "best" turboback exhaust depends on the amount of flow, or horsepower. At 250 hp, 2.5" is fine. Going to 3" at this power level won't get you much, if anything, other than a louder exhaust note. 300 hp and you're definitely suboptimal with 2.5". For 400-450 hp, even 3" is on the small side.”

Now I'm not even going to break 200hp so why bother with the extra cost (albeit not much) and extra noise for sweet bugger all?

The engineer does say bigger is better in any turbo case but you get what I am saying, at this level it doesn't really matter.

Here is the link if you want to read it:

http://www.tercelreference.com/tercel_info/turbo_exhaust_theory/turbo_exhaust_theory.html

[Shane]

I've seen a lot of posts about the 2.5" vs 3", especially on the aussie patrol sites.

The outlet on the turbo is 2.5", I can't quite see the logic in going 3" from there back?

I think having a 2.5" mandrel bent system with no mufflers will be OK for my purposes, I'm not looking for huge power here.

The question is WHY would you run 2.5 over 3"

plenty of pro's for 3", no cons.


turbos want as little exhaust restriction as possible. Every bend in that exhaust is a restriction and going 3" minimizes that.

even if you want the same peak power- it can help your spool too.

I hear what you are saying but I don't think there will be bugger all difference in power for this type of motor between 2.5" and 3".

Here is a quote from a turbosystems engineer at Garret.

"As for 2.5" vs. 3.0", the "best" turboback exhaust depends on the amount of flow, or horsepower. At 250 hp, 2.5" is fine. Going to 3" at this power level won't get you much, if anything, other than a louder exhaust note. 300 hp and you're definitely suboptimal with 2.5". For 400-450 hp, even 3" is on the small side.”

Now I'm not even going to break 200hp so why bother with the extra cost (albeit not much) and extra noise for sweet bugger all?

The engineer does say bigger is better in any turbo case but you get what I am saying, at this level it doesn't really matter.

Here is the link if you want to read it:

http://www.tercelreference.com/tercel_info/turbo_exhaust_theory/turbo_exhaust_theory.html

If you wont 2.5" mate go for it,like you say wont make stuff all differents,esp if you use the good bends.

[PigFmr]

i have a 3inch dump pipe up untill the flexi under passergers side seat and then 2and half straight through ,
marmel your truck your choice

vince

[marmel]

i have a 3inch dump pipe up untill the flexi under passergers side seat and then 2and half straight through ,
marmel your truck your choice

vince

I could see the benefit in this even if it is just to get the heat away from the motor.

[darinz]

You also need to remember that alot of people talking about exhuasts are using petrol engines as the guide. 200hp deisel is way different to 200hp petrol.
Your truck you decision but on the conservative side a turboed TD42 with a good sized turbo (not factory) and about 14 psi is going to be over 200hp. So if 250hp is the limit for 2.5" then you are close to that with pretty much every TD42 with aftermarket turbo. Any good aftermarket kit has a 3" exhuast option and is recomended if intercooled.
100rwkw, which is pretty standard for aftermarket turboed TD42 is about 210fwhp.
But upon saying that, I don't believe that quote about 450hp being too much for 3". My exhuast was built by some very experience racecar builders and there was a lot of discussion around the size needed. I assumed I'd need 4" but they convinced me 3" was plenty. As it turns out they have found there is no need to go bigger than 3" untill over 800hp.

Anyway what is the difference in price? If it isn't much then surely it is a simple decision.

[DieselBoy]

A full 3" system on the SWB cost me $750 a couple of years ago, included straight through silencer and long flexi.

[Damz]

Im building a navara and making a 3" mandrel system. And its only 2/3 a TD42