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Old 28-08-12 Thread Starter
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8v JTDm / 8v CDTI

Did try searching this forum, but didn't find the answer to my basic question...

What figures can I expect from a remap on a standard 120ps Euro 4 1.9 8v CDTI (Vauxhall Astra van), which I believe is a 1.9 JTDm.

It has the one piece manifold and turbine housing GT1749VM turbo, full width FMIC as standard (same as 16v version), pre-catalyst and catalyst.

I'm not trying to achieve a set BHP figure, so if there is just a max safe boost pressure, rail pressure, duration/mg figure instead that would be a great help thanks
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Old 03-09-12 Thread Starter
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Have been reading through many posts, came across this one:

Did you try High Pressure Pump (0445110150 - CR/CP1H3/R70/10-89S) and injectors (0445110276 - CR/IPL17/ZEREK20S) from Alfa 147 Mjet 120Hp 8v ?

From user TMC_Motorsport.

Having checked these part numbers, these are exactly what I have fitted to mine.

Can anyone confirm these are good for the ~190bhp I keep reading about? But turbo capability and 8v head puts power back to about 160bhp?
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Old 03-09-12
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yes and yes (turbo especially)
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Old 03-09-12 Thread Starter
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Thanks for the quick reply!

Think I read one of your posts, saying the 8v 1749VM turbo had the higher A/R turbine side, 16v 1749VM higher on compressor side.

Would I match the injector capability with 16v compressor/8v turbine?
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Old 03-09-12
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A/R is not much important on compressor side. Get the GTB1549V from 2.0JTDm.
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Old 03-09-12 Thread Starter
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Interesting, that sounds small, but guess its not. I'm guessing this is on the new Astra/Insignia too, will get looking. Vacuum actuator on any of them?

I should say, I do have the M32 6 speed box, so torque will need to be limited anyway!
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Old 04-09-12
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Sounds small, but when talking about matching ~190HP injectors, there is nothing better IMHO. All these latest VNT turbos are vacuum or electronicaly actuated. Regarding gearbox/clutch - you have to test it yourself.
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Old 04-09-12 Thread Starter
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Have just been researching specs on my current turbo:
Compressor 49ex 34.6in
Turbine 43in 38ex

16v CDTI turbo same turbine wheel, but compressor has 36.3in.
If same as JTDm separate turbine housing and manifold, AR .59 on the 16v, .61 on the 8v.

The 16v specs look similar to 2.0 TDI 170, and both CDTI 16v and 2.0 TDI 170 can get 200bhp if not more when remapped.

Is this 8v head that bad? I would've expected/hoped that a 16v turbo (or compressor wheel and machined housing) fitted to my existing turbine housing would match the ~190bhp of my injectors?
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Old 04-09-12
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if its a1749mv i think it may have the larger vnt vanes and larger turbine tip height(bonus).but the 8v will flow less than the 16v cant get away from that, id imagine extra boost =diminishing returns so id look at 160-170hp remap(which may feel good as the 8v may have a torquier low end?)
have a look in yan.ko threads what hes had to do to get 200hp on the 8v(although i think hes over building in hopes for 250hp in future)
some r/r for you
http://www.astraownersnetwork.co.uk/...DTI-8v-Results
http://www.astraownersnetwork.co.uk/...-8V-IPF-mapped
http://www.astraownersnetwork.co.uk/...van-on-rollers
http://www.astraownersnetwork.co.uk/...DTH-8v-Results

Last edited by sussexa; 04-09-12 at 22:02.
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Old 04-09-12 Thread Starter
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I did go on that site briefly, but its all tuning boxes and pedal boxes on there so straight back off again!

I have read through a lot on here, so much more technical info than on any UK vauxhall sites, just the problem is there are turbo/fuelling differences between Euro 2/3/4.

I did actually get tip height, 7.2mm, if you happen to know the difference?? I have seen the VM turbo referenced as 3rd gen, i.e GTB on other forums but nothing official
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