Should I upgrade turbo? (HKS3037 v HKS T04R)

[muaythailuke]

Hi Guys,

Im thinking of upgrading my turbo from a HKS GT3037Pro S to a HKS T04R. With the 3037 before engine rebuild I had full boost(14psi) by 4000rpm but now with the new engine with a p'n'p head with 256(in) 264(ex) cams I would think responce would be a bit quicker, so with the larger T04R installed would I see much more lag?

Is the T04R ball bearing or bushes type turbo? I was told some of the T04R's came with roller bearings, so how would you tell?

Id like to have a reasonably responsive engine with good power, so I didnt know whether the T04R would be too laggy. Any sugestions whether I should keep the 3037 or go for the T04R or even go something different again would be helpful.

Thanks

[whistla]

Ill buy that 3037proS off you, if you are considering updating to the T04R

[R32-GTS]

To4Z is basically a ball bearing t04R . to4 is still plain bearing. to4z seems to be very popular in japan atm.

[muaythailuke]

Ill buy that 3037proS off you, if you are considering updating to the T04R

Sorry but i already have a sale for it if I decide to go ahead with it thats why I was considering it cause I can sell mine straight away and I know where there is a really good S/H t04r for sale.

[crack]

have a look at this website. about supras in the U.S. but some insane hp from the to4r.

[R31Nismoid]

what motor are we talking about/what specs?

[muaythailuke]

what motor are we talking about/what specs?

Sorry I should have explained a bit more.

My previous setup was on a internally standard RB25DET with a few bolt on's such as big injectors, FMIC, 3" exhaust, haltech E11, and a HKS GT3037Pro s running 14psi which I got 270rwkw from, full boost by 4000rpm, until wound up the boost too much and took the edge off a piston

New setup has a strengthen bottom end too withstand the power increase plus the head been port 'n' polished with 256(in) 264(ex) cams and up rated valve springs, front facing plenum with large throttle body, 4" exhaust, turbo undecided??

I’m not gonna get much over 300rwkw from the 3037 but should be very responsive but will need to run pretty high boost to get that sort of power.... so if I went to a t04r top end will be a huge difference but how much response would I loose? and not being a balling bearing turbo would I be especially down grading turbo's? but I could run in easy 300rwkw without running heaps of boost through the engine so I really dont know whether to go ahead with it all :confused:

Sorry for being so long winded :zzz:

[R31Nismoid]

if you made 270rwkw @ 14psi, running 20psi will net you over 300rwkw.

with 4" exhaust (a must) and other things... you'll crack 300 no problem

i'd stay with the 3037 personally. It would be a true street weapon then. Damn fast.

My GT30 600hp comes on and sounds similar to what you have (on your old motor)

just that mine was 2 psi more for the 270rwkw. Which is negligable, dyno dependant i'd say

Stick with the 3037 much more than 300rwkw and u struggle for traction (well i imagine i will when i get there) and then breaking things down the rear end could come into it.

Having come from an old t04e with a int gated rear... i would never go back to a non bb turbo. They are not as progressive.

GT30 is smoother in the way it builds boost, the t04 was more snappy which i didnt personally like.

Just my thoughts for ya

you'll net a mid 11 sec pass id imagine and would be a circuit beast. Whatever tickles your fancy.

If your not happy once its all done maybe then change the turbo then? Wont cost much and only a change in the dump pipe possibly

[muaythailuke]

Thanks Nismoid, I think the 3037 is a far more advanced turbo than the t04r thats way I dont really wont to get rid of it really. I prefer circuit racing over drag racing so im not really chasing huge hp, although 350kw would be cool, so I think I might just stay with 3037 and just see what it does and just go from there. To ugrade at a later date shouldnt cost much anyway cause I will always get good $'s for the HKS 3037.

Cheers

[Cubes]

hrmm thanks for the heads up on the 3037ProS.

Sounds exactly what I want.

Tell me.

Are you still running on the stock exh. manifold?

What size exhaust a/r are you running?

[R31Nismoid]

your running a 3ltr though arent you?

You needs the power of the GT35

[Bl4cK32]

Yes, but top end isnt always what people want. Id still be happy with a 3037Pro s that has usable power (read traction) than a GT35 which will make 350rwkw+ and just spin the tyres

*im going the GT35r myself though

[muaythailuke]

hrmm thanks for the heads up on the 3037ProS.

 

Sounds exactly what I want.

 

Tell me.  

Are you still running on the stock exh. manifold?

What size exhaust a/r are you running?

Yeah I was running the stock exh manifold, but I have now bought one of the stainless tubular ones from the states off ebay see how that goes dont really care if it cracks or whatever only owes me $200 and it cant be any worse than shitty stock manifold.

As for the a/r I really dont know if its a .68 or .87 and I dont know where to find it on the turbo either. Does anyone know how I can find out?

[Cubes]

Take a pic, its easy to tell the size by looking how FAT it looks.

.68 looks near stock. There is a definite noticable difference between .68 and the .87.

Judging by your spool I would say you are running the .87.

[R31Nismoid]

his will be a .87 without a doubt.

[muaythailuke]

Take a pic, its easy to tell the size by looking how FAT it looks.

 

.68 looks near stock. There is a definite noticable difference between .68 and the .87.

 

Judging by your spool I would say you are running the .87.

Yeah its a hell of alot bigger than stock, so I would say it was a .87