Correct, but isn't the GT series 28 a dual ball bearing whereas the normal 28 is not?

I think the GT28R is actually the disco potato that was hailed with praise in SCC a few years back, with a better flow rate and less spool time. I thought about using a GT28R for an autoX turbo setup. Lots of low end for getting around corners and impressive top end for its size. I think they said it is worth about 250 - 300 whp.

But that was a long time ago and I might not be remembering that correctly.

 

Use the stock turbo, keep the TMIC, heat wrap the manifold and housing. Ceramic coat the wheel and housing, full 3" exhaust, no intake/open turbo, port the exhaust in the housings, upgrade the bov (stock bpav leaks alittle)

GT28RS
http://www.importperformanceparts.ne...-garretts.html
http://www.turbobygarrett.com/turbob...S_739548_1.htm

 

The GT28 is also a t3 flange style which no ones makes a t3 manifold for rotaries, you'd have to have that custom made.

 

my k03 spools up pretty quick.. lol.

 

No, you're right, I'm talking about turbo lag, and not boost threshold.

Using the stock turbo, I wasn't able to corner as I wanted because I felt it sluggish at the entrance, as I used the throttle. I'm looking for something that spools rediculously quick. I'd also like it to have a big rpm range, in case I fall out of the powerband and am not in a place to shift.

 

The stock turbo spools ridiculously quick... If your at 3k rpms coming out of corner then downshift to a lower gear so your at a higher rpm. Anything smaller and you'll be in boost at idle.

 

yeh if you want boost response that quick, get a supercharger.

 

what ever you do, don't listen to this guy.....Open turbo with no filter??? yeah your just asking to fire something threw the turbo and into your motor. Then you get to replace both.

 

same here!

 

I was at 5-6k and the stock turbo felt sluggish, maybe I should just go back to N/A....

 

Thats interesting, I have a s5 with a, you guessed it, s5 highflow turbo, largest t04 internals you can fit without changing covers, and ported wastegate, and at that rpm range I usually have full boost.

It will start spooling at about 2500 - 3000 (depends on gear) and holds it all the way through the rev range.

 

I had an S4, 10AE to be exact, and I don't know, the lag was definitely noticeable. It spooled early, but it didn't really hit full boost till well within the rev range either.

 

Another thing to note, I did have a turbo/mild port done to my engine, so that helps spool and hold boost better, but my car is fairly flat under 2500rpm, but the porting helps a lot IMHO.

Do you have a boost controller, and if so what type?

If you don't it could be the progressive way the turbo setups on an FC come on boost.

Compared to say my friends 180sx (240sx) with an SR20DET when it comes on boost its got a throw to it when boost comes on. Whereas my car is very linear and even though it gets to say 12 psi at 7000rpm earlier on, say 4000rpm i only seeing around 4-5psi. So it just keeps building boost instead.

An electronic boost controller may help, on most you can set how they come on boost (smooth and linear or rough and all at once).

Or (please don't start a fight about this) do you have a blow off valve? High revs + lots of boost, throttle snaps shut, turbo slows down, then WOT, turbo has to spool again? Used to happen to me when my stock BOV started to die and I ran more boost. 3rd to 4th full boost, lost all cos the BOV was rooted.

Sorry for the long *** post!

I may be way off though.... just a thought

 

Would I have no filter on my turbo? No. He's the one wanting full boost at 1500rpms...

 

roen, if your stock turbo has noticable lag there is something wrong with your setup.

also, get a gt28 if you can get someone to make you a little wussy manifold for it.

 

Hyundai Scoop turbo T15 ownz joo all

 

How fast do you need to spool the turbo???

There's a delicate balance between turbo spool and top-end power.
Once will always suffer when you're sizing turbos.

A GT35R with the smaller 0.86(?) turbine A / R should spool like a **** on a 13B.
If not, dropping down to a smaller GT30R should get the turbo to spool in the 2,xxxRPM range.

I agree - if you're worried about turbo lag, why not go SUPERCHARGER???


-Ted

 

Theres something wrong with his turbo. If you want ridiculous spool, a simple hybrid with a free flowing filter and TID along with a 90mm exhaust and you'll be cruising along and in boost. Say bye to gas mileage. Want faster spool yet? street port and run high comp rotors. Then litterally you'll be in boost all the damn time. (don't believe me, talk with BlueTII and or Kevin from Rotary Ressurection). I have yet encountered any auto X track in a stock TII were I fell off boost (with an aftermarket exhaust). You need to fix your turbo or learn to drive differently. That or do a V8 swap or super charger *cringe*.

~Mike............