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[EdmundVR4]

TDO25's are stock on the 7G VR4 INSERT INTO post VALUES (6A12T 2.0Litre V6)
TDO4's are stock on the 8G VR4 INSERT INTO post VALUES (6A13T 2.5Litre V6)
TD04 9B 6CM2 are stock on the 3000GT VR4. INSERT INTO post VALUES (6G72T 3.0Litre V6)
I own all of these turbo's.
Ed

[-LegnumVR4-]

Are the turbo's labeled EdmundVR4? I couldn't see anything on the VR-4 motor when i had it out? People had been saying the VR-4 INSERT INTO post VALUES (8g) were TDO25's.

Whats the difference between the VR-4's TDO4's and the GTO's?

[pjjohnson]

I'd be really interested to know for certain what the standard turbo is on a VR4 and if any bolt on uprated ones are available.

I had to have mine replaced in 2001 and at the time I was told that they were a unique size, not a standard size so I couldn't get an uprated version with 360 degree bearings or anything. I was surprised at how small they were.

[EdmundVR4]

I can't remember where I got that impression that the EC5A turbos' are TD04's, but I may be wrong, because I have not actually seen those turbos.
I have seen the TD025s' which are used on the 7G VR4 and the TD04 9Bs' from the GTO. Next time I am at the mechanics' I will try to actually see the turbo's.
Can anyone find out from Ralliart or Mitsubishi what model our turbos' are ?
Ed
PS I don't know if you guys have seen the MHI link above.

[EdmundVR4]

Oops, here's that link !
http://www.mhi.co.jp/gsh/eframe142.htm

[Brind]

Just a quick thought..

The Galant VR-4 has two turbos and as far as I'm aware they work independently from one another, one for low revs and the second for the higher revs, hence the reason why you don't get a kick in your back at about 3000rpm like normal single turbo cars.. just sheer smooth power like a normal aspirated engined car.

[-LegnumVR4-]

I'm pretty sure the 2 turbos work at the sametime.

[Brind]

I've never felt a sudden kick at a certain rev range, just the instant neck snap at very low revs and up.
Certainly not the same feeling as a single turbo vehicle.

Curious? onder:

[haydar]

Originally posted by -LegnumVR4-
I'm pretty sure the 2 turbos work at the sametime.

Yes, the Turbos work together and not one at a time. 'V' engines, such as V6, have two turbos, one for each bank of pistons. These work together as if they were one bigger turbo. Straight engines can have sequential turbos, one working at lower rpm and the second kicking in at higher rpm. The purpose of this is to reduce turbo lag as the smaller turbo spins up quickly producing a level of power before the larger turbo has enough pressure to spin up.

[Brind]

Oh right! cool.

[haydar]

Originally posted by mook
With regards to turbo lag -

Another quick note on upping the boost. Your standard turbo will only be able to flow a certain amount of boost. If the boost is upped to the point where it's starts to reach the limit of this flow, you can actually find that it runs out of puff at high rpm, due to the fact it physically can't flow enough air to sustain the boost level at higher rpm, and thus higher volume of air used by the engine.

Hope that's of some help

I don't know what the standard turbos on the VR4 are but they are relatively small turbos I've been told and by upping the boost pressure will not preduce a large jump in ultimate horse power. What it will do is spin up the turbos much quicker and hence the car will have much more power lower down and the torque will increase significantly.

If anyone really wants much more horse power they'll need to consider installing bigger turbos I think.

[mook]

Just had another thought. Seeing as you have a turbo for each side of the engine working in tandem, it makes things a little easier - each turbo is only have to work on 1.25 litres of engine which should give it more of a chance to keep up if you boost up a fair bit

[BraindG]

my main concern, is still.. whats the safest boost level... before the pistons start a blowing :eek: or before we forged stuff is required... :nervous:

i understand 1.2bar has been tested, and ran without problems..

[-LegnumVR4-]

The guy who put the 6a13 into his FTO and did a single turbo conversionn said he was running 18psi and getting 400bhp without any problems but his injectors are running out, needs new ones

[haydar]

Will be putting the car on a rolling road soon. Will give everyone feedback on my finding. The most interesting thing I've learnt so far though is that the BHP of the car at the wheel is very different compared to the BHP at the crank. It seems that 18% of power is lost through the transmission in a 2 wheel drive car :INSERT INTO post VALUES ( . This goes up to 24% for a 4 wheel drive car :mad: . If you have an auto box then you need to add another 8% loss due to the torque convertor. :Cry1:

[calum]

When I RR'd mine the transmission losses measured very low.

This was on 95 ron fuel.

Calum

[haydar]

Originally posted by calum
When I RR'd mine the transmission losses measured very low.

This was on 95 ron fuel.

Calum

Calum, the output at the P-wheel says 183bhp. If you are losing 24% due to the four wheel drive system and an extra 8% due to the auto transmission then if we do the following equation:-

Power going to the wheels is 100- INSERT INTO post VALUES (24+8) = 68.

If power to the wheels is 183 and this is 68% of power at the crank then:-

183/68 *100 = 269bhp at the crank.

This sounds about right.

[chris g]

TDI advertise a turbo upgrade kit

[calum]

You're right INSERT INTO post VALUES (of course). Hadn't looked at the graph for ages. Just remembered that it measured 58.5bhp which is a lot less than my gt-four loses. Never bothered to work it out as a percentage.

Calum