Engine mods, which order?

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Which order

  • CHIP - INTERCOOLER - EXHAUST

    Votes: 0 0.0%
  • CHIP - EXHAUST - INTERCOOLER

    Votes: 5 8.1%
  • INTERCOOLER - EXHAUST - CHIP

    Votes: 12 19.4%
  • INTERCOOLER - CHIP - EXHAUST

    Votes: 1 1.6%
  • EXHAUST - INTERCOOLER - CHIP

    Votes: 31 50.0%
  • EXHAUST - CHIP - INTERCOOLER

    Votes: 13 21.0%

  • Total voters
    62

mgermasi

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6 shops 6 different answers, let's see what the forum thinks as well.

3 engine modifications on the list but which one first , second and third?
 
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Shops that specialise in mainly chips will tell you chip first.
Exhaust shops that do exhaust and chip will say exhaust then chip or vice versa
Not many make a cooler kit, but those guys will generally say cooler first.

The correct answer is Exhaust - Intercooler - Chip.

The stock intercooler isnt as bad as alot of people think, upgrading it wont see big performance gains at stock boost levels but it will see a much more stable power delivery, as the cooler wont heat soak as much as a larger more efficient aftermarket unit.

The exhaust is certainly the most critical to get fixed first though. I just cant put in words how much you are helping power delivery, fuel economy and engine longevity by reducing exhaust backpressure.
 
Exhaust> Intercooler> No chip

If you feel you can't live life without "chipping it up" Go for the type that dose not up fuel rail pressure.
 
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Exhaust> Intercooler> No chip

If you feel you can't live life without "chipping it up" Go for the type that dose not up fuel rail pressure.

What makes you say this?

Fuel rail pressure increase has more advantages than people realise.

The reason companies use common rail is so they can have very high pressures. High pressures mean better fuel atomisation thus better economy, emissions and power.

The only down side to upping the rail pressure is when you start to approach the limits of the vehicle and end up with limp home mode.

In 90% of circumstances there is no need to go further than the safe limit that you can achieve out of a rail pressure increase in a D40.

In the other 10% of cases that have intercooler upgrades, run more boost etc... Then it is advisable to have injector extension ONTOP of the rail pressure increase, NOT Instead of it.
 
There is a company, not naming any names, but its a big well known one that does pressure style chips, they apparently instal a device which removes the safety pressure valve on the common rail in the D40, now Denso specifies the rail can operate at and up to 2200BAR in the nissan YD25 service manual. My issue is changing this you essentially turn the fuel rail into a bomb, any poor welds or fissure cracks could cause it to explode/fail catastrophically, it'd be like removing the pressure valve in a hot water system, very dangerous and IMO pretty stupid.

Apparently the pressure chips cause more issues with the hilux 1KD than anything else though.

in any case I voted exhaust-chip-IC since you have an intercooler.
 
^^ Yep kind of expresses my sentiments.
The pressures CRD engines operate at is scary enough as is without upping the ante. In line with a couple of other of my recent posts on this forum I'm looking at mods that may slightly increase power and hopefully reduce stress on what is really a fairly high stressed engine for starters.
 
well you can do the usual mods Tappet, exhaust, egr block and catch can all help along with regular oil changes.
 
My issue is changing this you essentially turn the fuel rail into a bomb, any poor welds or fissure cracks could cause it to explode/fail catastrophically, it'd be like removing the pressure valve in a hot water system, very dangerous and IMO.

That is not correct, diesel is non compressable, there is no way the fuel rail can explode.
AFAIK, no company is blocking the valve , only shimming.
 
well you can believe that its all safe, I however will continue to alert people to the possible dangers of fitting such devices to their engines.
 
That is not correct, diesel is non compressable, there is no way the fuel rail can explode.
AFAIK, no company is blocking the valve , only shimming.

I have personally seen a blank spill valve ,it was supplied for a Isuzu 2007 d max to a friend of my together with egt blank and chip from chip it in Sydney about a year ago .. They are around and are machined from 1 bit of steel with no holes .As for mine I ended up shimming it cos it don't look right to me no to have some sort of relief in place. Either way the Isuzu is still running fine year later.
 
Yea but dmax's go forever and have engines that never break, what hope has a regular car got? :p
 
very interesting, so it looks like people get more benefits from exhaust and intercooler and not from the chip like most shops want us to believe.
Also I wonder what happen if I end the exhaust at the end of the dpf instead of installing a bigger diameter from the dpf to the end.
I believe a short distance with small diameter could be = to a long distance with big diameter as far as gas flow goes.
 
very interesting, so it looks like people get more benefits from exhaust and intercooler and not from the chip like most shops want us to believe.
Also I wonder what happen if I end the exhaust at the end of the dpf instead of installing a bigger diameter from the dpf to the end.
I believe a short distance with small diameter could be = to a long distance with big diameter as far as gas flow goes.

Depends on what you call benefit. If it's Kilowatts your talking about there is no doubt the chipsters applying there skulduggery will have the biggest gain for a given single mod. Larger exhaust and larger more efficient intercooler will only have small gains by comparison but it's safe gains so to speak. Over life of the engine which may be extended if you don't take the pouring more fuel in approach, better free flowing exhaust and larger more efficient intercooler would be of the greatest benefit IMHO. In other words small gain especially for the outlay but better piece of mind and less stress on the engine.
 

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