Eliminate turbo lag

**rick130** · 16th May 2008, 05:51 AM

Originally Posted by slug_burner

Pete,

Agree about the deminishing returns, Pereto's 80:20 rule applies. Please excuse my ignorance but can you explain what you mean by equal length primaries? does this apply to a turbo diesels? Also a custom exhaust manifold? Are we talking something cast or something made from tube? I just have some concern about the noise and heat that you get with thin walled tubed extractors. When I was a younger tacker I had a mini and I put extractors on, the noise was noticeable, even induction noise i.e. the noise of the air getting sucked into the carb.

equal length primaries applies to any turbocharged engine IMO, however you will battle the bogey of fitting the buggers, and the correct style (merge) collector must be used to minimise volume changes or you will see decreased benefits.
Cast iron is just so attractive as it's cheap and durable, and you can get the turbo very close to the valves, speeding spool up.

As to material, in an ideal world you would use Inconel, but very few outside F1/WSC/WRC/aircraft industries can form/weld it.
321 stainless is the next best material, but it is also difficult to find here and work.

xrayxray · 16th May 2008, 05:52 AM

Ive ordered a VNT Turbo and manifold,Full size intercooler and larger capacity alloy radiator to go on my 300tdi 130.
The complete kit is coming from the UK.
I have been asking a lot of questions about performance and reliability and Andrew from Allisport has been very obliging,here is part of an email he has sent me.

Your car should produce a minimum of 155 bhp with the large cooler, turbo and pump optimisation. The VNT does not so much add horsepower as add driveability, for which there are no actual figures. All power is in the lower and mid range, again, the VNT helps here and you can expect full boost at around 1400 rpm instead of 1800 +.

As you are planning to use the bigger intercooler, I would not worry about overstressing the engine, again particularly if you were to use the alloy rad. When the engine is properly optimised, you can achieve better performance, economy and reduced stress on the head. With a larger spread of power, you have less gearchanges meaning less stress on the clutch and drive train too.

**Psimpson7** · 16th May 2008, 07:15 AM

Slug Burner,

As Rick has said, it basically means that the length of all 4 of the exhaust manifold pipes are the same length between the head and the turbo mounting face. I was refering to something fabricated from tube!

Intersting point about noise, I didn't quite have equal length primaries on mine, but its 'sister' car did, and he always struggled with noise testing, whereas mine was 'pretty' quiet

There is so much you can do if you have the time and money (and patience!)

Pete

**Psimpson7** · 16th May 2008, 07:20 AM

some interesting pictures on this thread.. you can see a nice manifold in some of them! TD5 not TDI however.

Spy Shots - A very special Td5 turbo..... : Devon 4x4 Off Road Forums

Cheers
Pete

xrayxray · 16th May 2008, 09:47 AM

This is the Kit I have ordered.

Cheers mickey.

**JamesB** · 16th May 2008, 10:11 AM

XRAYXRAY out of curiosity how much and where is the kit coming from ?

xrayxray · 16th May 2008, 11:44 AM

The kit is coming from the UK, company is called Allisport.
Cost is about $2,400.00, not including the intercooler or the Alloy radiator.

Similar Mitsubishi turbo from DTS Australia is about the same price and doesn't include a manifold.

Cheers mickey.

**rick130** · 16th May 2008, 11:56 AM

Originally Posted by xrayxray

<snip>

Similar Mitsubishi turbo from DTS Australia is about the same price and doesn't include a manifold.

Cheers mickey.

The MTQ kit does include the exhaust manifold, it has to, as the stock Garrett's turbine housing is cast as the centre two cylinders of the exhaust manifold. The TD04 Mitsubishi bolts onto the new cast centre.
With MTQ, you exchange the No's 1 and 4 cyl 'ears', as these are re-machined to fit the new centre.

**Dougal** · 16th May 2008, 01:59 PM

Originally Posted by xrayxray

Similar Mitsubishi turbo from DTS Australia is about the same price and doesn't include a manifold.

Cheers mickey.

Of couse the MHI turbo isn't variable vane.

xrayxray · 16th May 2008, 02:23 PM

Yes your right Ric,my mistake,still I prefer the Allisport manifold as it allows for changing out of turbos if needed and as dougal has said the Mitsubishi isn't A variable vane.
According to Allisport there combined system will make 20 more horsepower than the MTQ system,the difference maybe contributed to tuning or the larger intercooler.
The reduced turbo lag and better bottom and mid end power is what I'm trying to achieve.
I will be getting the defender dynoed and letting you blokes know what it is getting at the rear wheels.

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