Variable Boost Turbo on Td5s

**Bush65** · 15th August 2009, 05:34 PM

Originally Posted by weeds

my local dyno shop tried to tell me that i would need a blow off valve if i wanted to get my tdi up to 15psi boost....he then went onto say that toyotas don't like to be pushed past 10psi

Petrol engines have a throttle that closes when you take your foot off the accelerator. When the throttle closes the air is blocked - the blow-off valve opens when the pressure rises due to the blocked flow. As the air from the turbo then flows through the valve, the turbo can keep spinning for when you put your right foot down again.

By comparison, a 300Tdi (and nearly all conventional diesels) does not have a throttle and the air from the turbo continues to flow as normal for the engine speed - only the fuel is reduced when you take your foot off the accelerator. A blow-off valve will have no affect.

Some later diesels do have a throttle - I am not familiar with any of these and suspect it must be something to do with emission/computer systems, possibly connected with air flow measurement (but I stand to be corrected).

**rijidij** · 15th August 2009, 11:06 PM

Originally Posted by PAT303

So how much does all the kit cost?. Pat

Well, the previous owner of the 130 paid $2400 for just the turbo (and manifold?), then there's the intercooler and radiator on top of that, probably $1000+ for them I would guess. Performance sure does cost $$$

Murray

**rijidij** · 15th August 2009, 11:09 PM

Originally Posted by Dougal

Funnily enough, I've been planning that for about two years now. Have the GT2256V, have the 4BD1T, have too many theives of time.

I'll be keeping an eye out for a good second hand VNT for the Isuzu.

**PAT303** · 16th August 2009, 04:37 PM

Originally Posted by rijidij

Well, the previous owner of the 130 paid $2400 for just the turbo (and manifold?), then there's the intercooler and radiator on top of that, probably $1000+ for them I would guess. Performance sure does cost $$$

Murray

Like you said If it wasn't for the price we would all have them.Any chance of a dyno run?. Pat

**Sleepy** · 16th August 2009, 04:50 PM

There is an interesting article on this very subject in the Sept Land Rover Enthusiast - from memory 750 pounds for the Turbo -don't think they spcified which one but was variable. They say removes most lag issues on td5.

Jock,

Re: stalling a Td5

Needs a different technique - realease clutch completely before pressing throttle - wont stall due to anti-stall feature. Takes a bit of getting used to.

(Well only stalled once in the last 6 months - when we picked up your 107" )

**Graeme** · 16th August 2009, 08:10 PM

Originally Posted by Bush65

Some later diesels do have a throttle - I am not familiar with any of these and suspect it must be something to do with emission/computer systems, possibly connected with air flow measurement (but I stand to be corrected).

EG. EU3 versions of the TD5, and yes, to force extra EGR unless its been disabled or removed.

**Slater** · 19th December 2009, 01:58 PM

Originally Posted by rijidij

I just bought a '96 130 CC 300tdi with a Garrett GT2556V (variable vane) turbo fitted, along with up graded 'Alisport' intercooler and radiator. I've only had it on the road for a few weeks, but I can tell you, it absolutely craps on my Td5 Xtreme when it comes to lag and straight out performance. Pretty impressed so far.

Cheers, Murray

So what is the fuel usage like Murray?

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