which turbo?

9th December 2009, 20:58

right ladies and gents, im now in a bit of a pickle.... have chopped and changed my mind many times now and have stumped myself in which turbo to use for my vtr turbo build, first was to to be t25 then t2 then t28 then it was td04 then back to t2 and now fook only knows, looking for some options and opinions on this now.... will be running
1.6 8v lump
pred ecu
stage 3 or above p&p head
rallye inlet with p&p tb
catcams custom turbo cam
whatever turbo with relevant cooling items and obviousley bigger injectors,
currently have the cituning turbo mani so anything that will fit or wont be too hard to make fit with this will be very good option, finally will be hoping to run between 1.2 and 1.6 bar(probably 1.6) thoughts and a opinions muchos appreciated

9th December 2009, 22:59

Something like a Garrett GT25 core with 53mm 62trim turbine and AR 60 compressor may work well at the spec your going for.

Edit, It may not fit on your manifold as a few I have seen have a daft 3 bolt fitting.

Edit 2, when you look at turbos such as the t25, t2, t28, td04, t2 you have to look at it further as the actual turbo specs vary massively from one turbo to another. My normal example is the T3 that comes on every from the little 90bhp Metro turbo all the way up to 200+bhp fire breathing cossie. Even though the turbo has the same name there not even close to the same spec.

10th December 2009, 00:25

hi, i will soon be doing another 8v turbo conversion in january for a friend of mine. but noticed that on my cituning turbo (t2) the bar that goes to my actuator is not straight like all the ones on the internet. it has a tiny step in it as it is very tight and goes around a lip on the engine. not sure if it is where the gear box bolts on cant remember.

think when i do my mate i will do an external waste gat and use that manifold that is on ebay. will look into it more they are really for high performance cars running high boost.

go with the T25 bit bigger that T2 but still not to big to cause any lag.

10th December 2009, 11:58

whats your budget? 200sx T25 turbos can be picked up cheap as chips so thats what im using.

10th December 2009, 12:35

get a GT28 RS . . . best for turbo convo's tbh. .

10th December 2009, 13:21

id say a 28 aswell because with what you wanna go for in the future it will cope fine

10th December 2009, 13:48

T28s are usually more expensive though

10th December 2009, 16:26

I've just mapped a stock VTS with a Saab-type T2 (GT17???) with 491cc injectors. Stock car otherwise.

It ran 63% duty which equates to around 190-199bhp.

This turbo will run easy to 14.5psi, which will see you to 250bhp.

How much power do you want??

Andy

10th December 2009, 20:51

thanks for the input lads, the two favs were the t25 and the t28, t28 being more expensive as said, had thought about the gt25 as ax sais but it would appear they are quite expensive and hard to find so that poked that unit out of the running, looking at the 200sx' t25 alot as theyre quite common and cheap as said but thiking im swaying towards the t28 if it can find a decent one for cheap.... and andy im setting my target to 200bhp however ill be happy with 180, although im after quite serious power tbf, seems only sensible with the money its going to cost to get it to any decent power that it might aswell be massive power, so anything over 200bhp will be a very nice bonus

10th December 2009, 21:30

I think the T25/T28 will be too big.

Or put another way, the little Saab Turbo (on a Saxo VTS) I mapped today had NO LAG AT ALL and will *EASILY* go to 200+bhp.

BTW my other cars are nissan 200sx with GT2560R ball bearing turbo and MR2 Turbo with CT20b, so I got an idea what they are like

By the way, it absolutely f***ing flew. Awesome car.

Andy

10th December 2009, 21:32

k04 or k03s.??

10th December 2009, 21:45

maybe a hybrid t2?.... if it does come to running more boost the little turbo will be able to hold a much higher load?

10th December 2009, 21:53

id much rather use a bigger turbo with less boost than run a small one at high capacity.
who cares if it spools up 200rpm slower.... you will learn to drive around the lag.

10th December 2009, 21:56

Quote:

Originally Posted by luthor1

I've just mapped a stock VTS with a Saab-type T2 (GT17???) with 491cc injectors. Stock car otherwise.

It ran 63% duty which equates to around 190-199bhp.

This turbo will run easy to 14.5psi, which will see you to 250bhp.

How much power do you want??

Andy

Hmm intresting.. would that be ben_vts again Andy??? If it's ben_vts then its a GT17

ManC

10th December 2009, 22:01

The turbo you mention above - is that just unbolted from a saab?

What would be recommended for a vtr with absolutely nothing but exhaust and induction? (with sigcon / 5th injector setup)

10th December 2009, 22:23

Yeah was Ben_vts. His car is very fast. Goes even better now!!!

Andy

11th December 2009, 17:08

When i turbo my vts i will be running a gt28 as its water cooled also so wont have to let car cool down before turning off after hard use but think i will be getting one anyway as for if need to pop places and can lock car but still running. Ive got alot of info about what turbo to use, etc from a guy i know who has the fastest crx del sol in the uk runing 360bhp atm.

11th December 2009, 18:02

Quote:

Originally Posted by luthor1

I think the T25/T28 will be too big.

Or put another way, the little Saab Turbo (on a Saxo VTS) I mapped today had NO LAG AT ALL and will *EASILY* go to 200+bhp.

BTW my other cars are nissan 200sx with GT2560R ball bearing turbo and MR2 Turbo with CT20b, so I got an idea what they are like

By the way, it absolutely f***ing flew. Awesome car.

Andy

see it thought this too... however as danny sais id rather it spool up slightly slower then be blasting itself constantly, you can learn to live with it and with my rekoning i can have the turbo cam spec'd to give it more low down grunt and aid the spool up, all interesting point though lads, this is why i made this thread, theres so much to think about, with alot of pro's and con's to running each unit

also andy ive only got 8vs so reaching the 200bhp mark will be slightly more of a task then ben... good to hear its running better though, sounds like the pred's a win win in respect to the boost.

back on topic though, it seems the various saab chargers are good on small engines such as mine but still im now no closer too a choice

i think the gt17 will be a litle bit to small for my needs, maybe the t2 will be a btter option again...... ffs im back where i started lmao

11th December 2009, 18:07

saab do a gt25 to ill have a look later tonight / tomorrow for you

11th December 2009, 18:07

Quote:

Originally Posted by pjw

The turbo you mention above - is that just unbolted from a saab?

What would be recommended for a vtr with absolutely nothing but exhaust and induction? (with sigcon / 5th injector setup)

some saabs have diff units but yeah from the right model it will just unbolt, and a small turbo is what you need the gt17 should do just fine

11th December 2009, 18:12

Quote:

Originally Posted by Sophia_Bush

saab do a gt25 to ill have a look later tonight / tomorrow for you

i know this mate, this is the model i was looking for but cant find any anywhere, the only ones i could find were mega bucks, if you could find me one that'd be a fookin serious help gav.... this is the ideal unit imo for my needs

11th December 2009, 18:14

Infact I think I know someone who may have one for sale recent rebuild to by saab mate will ask him for you

11th December 2009, 18:21

nice one, let me kknow mate, will be a big help

12th December 2009, 08:07

Saab's T25 aren't 360 degree.

What power are you looking for?

I can't see a T2 running much over 200bhp. A T25 off a Saab 9000 turbo will get you to around 230bhp.

I used to build Turbo kits for MX-5, what you have to remember is that 1 bar from a T2 is very different from 1 bar from a T28. Since 'boost' is merely a measure of flow resistance. A T2 making over 1 bar will be well out of its comfort zone and cooking your inlet temps.

I feel the best turbo for you by a long way is the Garrett GT2556. It'll happily flow for 260bhp and you'll still be on full boost by 2300rpm. Sadly they are expensive and most of these builds are done on a very very small budget.

Saab also do a T25/td04 hybrid which is very handy but very rare.

12th December 2009, 11:48

What would a td04 be like on a vts? Mates got one off his passat 1.8t.

12th December 2009, 16:05

Quote:

Originally Posted by jsdvtr

What would a td04 be like on a vts? Mates got one off his passat 1.8t.

Passats have KO3's on them.

12th December 2009, 16:15

a k03 would be another choice or k04. the thing is those are turbos that came off a similar sized engine to the vtr/vts so it will always work well.

a k03s is good for 230bhp and spool up by 2000rpm with good inlet/exhaust setup.
the k04 is good for 300bhp and there are upgrades that can take you past 300hp and they spool up so so quickly.

13th December 2009, 18:26

thanks for the input lads, hoping gav can find a gt25 as this will be spot on, may look into the k03/4.. and waitey the t2 was a choice made when i was going low boost of 7-8psi with aims of 150bhp, now ive decided to plunder all my pennies in and go forged so paying over the knot for uprated engine parts and runing low boost is just stupid really so im gonna go high now, hence the turbo choice thread

13th December 2009, 18:29

Im going to be useing a TD04...

13th December 2009, 18:29

same situation and choice i made blackie. apart from a gt28 instead off a 25 lol.

13th December 2009, 18:31

gt28's are expensive lol, i feel the gt25 willl be more then adequate for my 8v, just finding one as theyre quite expensive also lol

14th December 2009, 15:50

Which would produce more power and be better for vts on low boost, t2 or td04?

14th December 2009, 16:24

Right Andy details are at home but I have a choice of 4 good turbos but one of them is the gt25/td04 hybrid but may be out of your ££ but will see

14th December 2009, 17:04

mate just baught 2 new GT28R's for 400 quid . . and sold one if i would have rememberd about this i would have pointed him your way . . .

14th December 2009, 20:12

cheers lads.. mega cheers gav, i like the sound of the hybrid... gimme some details