And thank you for your help too, even though your helping someone hijack my thread.

 

I offered quite a bit of help to you here in this thread, and rather than thank me for it you broke my ***** for basically not being spot on for a ballpark turbo kit price quote I mentioned for a kit that I don't sell. No hard feelings, I'm not some sensitive little bitch, I just like to see some appreciation when I take the time to sit down and offer informed knowledge to those searching for answers.

I don't really see where your thread has been hijacked--look at the title, you're both 'looking for the right turbo.'

As far as A-Spec goes, have you picked up the phone and called them? email doesnt cut it. As a shop owner who used to run the showroom for one of the most well-known rotary shops in the country, I can tell you that you'll get much better information over the phone.

To answer your other question, the T04Z is basically a ball bearing T04R. The rest of what I mentioned before still applies---I feel that for conservative pump gas boost levels (up to about 15 psi) the 35R is the way to go if you like spool and response at 3000 rpm rather than 4000 rpm.

 

Yeah, if you want a good street turbo with fast spool get the gt35r with the .82

The to4z sounds like an awesome turbo, but seems like more power than you are looking for.

 

it was probably a couple hundred more cause of the options you were choosing...are you getting the kit ceramic coated, anti surge, or the waste dump or re-routed into the dp?

 

No intention to hijack your thread. I just figure that as we have similar objectives (e.g. streetable setup w/ 375RWHP), I can add some Korean spice to this discussion (aka TD06 and RX6 alternatives). Besides, given the time diff, there shouldn't be too much of a discussion bottleneck. Anyway, I am sure that I am not the only newbie who's glad that you started this thread. Finding the right turbo turns out to be the quest for the holy grail...

 

From what I have been researching a T61 will definately work for your goals and be on the cheaper side of things. The compressor map is very nice in the 15-22psi region for a rotary.

 

For a streetable setup in the 375-400 range a 60-1 is also a great choice, very proven performer. Sometimes I think people complicate things for the sake of complicating them. I will attach the compressor map, but it would be perfect in that power range. The T61 will perform a bit better at higher boost but suffer a little response.

 

I guess once single, always single, haha.

Thx for recommending the RX6. But how much faster does it actually spool under low boost (12-14 psi ) compared to the GT35R/T4 kits from A-spec and Gotham Racing (especially with 0.82 A/R on the hotside). It seems to me that the new GT35R/T4's offer similar if not better spool and torque characteristics. Especially, the Gotham Racing GT35R/T4 kit with dual wastegates looks quite nice.

 

Why do you need dual wastegates at 12-14 psi?

 

First of all, thanks for the info. It's just amazing how helpful you guys are.

I agree that my AI needs a serious upgrade. Don't understand why the previous owner spent so much money on other goodies including a GTR34 fuel pump, but left the injectors and fuel regulator stock (for details see https://www.rx7club.com/vbgarage.php?do=view&id=95009). I presume that new 550 primaries and 1600 secondaries coupled with a regulator will solve this problem.

Regarding my engine blow I must admit that it is partially due to my stupidity as it happened on a sunny but cold winter day with minus 10 degrees Celsius at 15psi and 7000rpm in fourth gear. Mea culpa is all I can say....

Although I am still learning how to read a compressor map, I can only agree that the GT40 "works in a narrow range at high boost". Despite good tuning and hardware, I didn't reach full boost until 4,500rpm when it hit with a vengeance. Definitely NOT what I call streetable.

I say "didn't", because the worst part is that 1) knock has appeared after I installed a rebuilt engine (~130 under heavy acceleration at 4,000~4,500 rpm) and 2) ZERO boost builds up in first gear below 4,500rpm. But I figure that's to be discussed on another thread.

 

I was just kidding about the Hijacking thing. I think just typing words can come off as unappriciative or that I'm serious about some things that I'm not.

I really do appreciate your help as you've helped me make my decision and even helped price my turbo for me. Thank you for you help. I am purchasing the GT3574 turbo from A-Spec tuning today. Now lets see if we can find pacatpkh a turbo.....

 

Apologies for my ignorance, but is a 60-1 the same as a Garrett T04S and if so, is that the turbine used in the HKS T04 kits? Can you also clarify the T61 specs. It is my understanding that it uses a GT35R compressor mated to a T04 turbine. But if that's the case, isn't it just the same as the GT3574 offered by A-spec?

Regarding your comment on dual wastegates, I agree that it is overkill at these boost levels. Nonetheless, it looks nice AND how knows I mighy turn powerhungry sooner or later as well. BTW, are there any negative effects for using large wastegates at low boost levels?

 

The maps I provided are for the compressor only. Reading a turbine map is exceedingly more difficult and requires a lot of temperature and pressure info that I dont know and can't speculate (plus they are n't available). However, in reading through the T61 and 60-1/62-1 compressor maps, they seem to suit the rotary nicely in their flow and efficiency at moderate boost levels, and those turbos seem to be very cheap when comparing to the newer offerings. The fact that they provide good performance, have proven themselves time and again, and are widely available for bargain prices was why I brought them into this thread. I dont know the specs on the HKS kits...or what cover they use.

Sizing the other side of the turbo would be harder...having enough preturbine backpressure to create boost but limiting the pressure so that we are actually getting the exhaust out of the engine is the great comprimise. I see a lot of people going with the really small A/R on the turbine side to get great response and that makes me wonder. What sort of preturbine back pressure is that creating? Could that be a reason why EGTs get so hot, and why we pop our engines so soon?

I am just learning this as well. However, it has been made clear to me, by others off of this board and reading posts from experienced members such as howard coleman (whom has very limited preturbine backpressure in his twins setup), that having excessive preturbine back pressure is not a good thing. So turbine sizing is very important as well, if not more important than compressor sizing.

I think the GT3574 represents a good comprimise. I would like to see how it performs with the 1.0 or 1.06 A/R exhaust housing. it seems that A-spec is selling a lot of the .82 A/R housings in that turbo...

A single wastegate has proven itself as effective even for the very power hungry folks. It just needs to be sized appropriately. Two wastegates seems like an unnecessary complication at lower boost levels if you ask me. but I am a little slow, so I like things as simple as possible

Take what I say with a grain of salt though...I am just throwing out some of my recent findings, to see what others think. I am very much just tring to learn.

 

You know, it's funny you mention that kit, I wasn't going to bring it up, but---

I recently rode in car with the GR63 dual wg kit during some tuning runs, and the boost response was nothing short of phenomenal. In 4th gear at highway speeds, cruising at 2800 rpm, full throttle, and 15 psi came almost immediately, by 3200 rpm! I personally am not a huge fan of the dual vented wg as it is crazy loud, but I think this turbo choice would also be nice for you and similar to a 35R.

 

Cool, good to hear

 

As I recall the GR63 is a ball bearing T04R. We dynoed one here and spooled nice.

Jason

 

What kind of turbo is used in the GR63kit? Is this a (dual) ball bearing type? Can't find any details on the Gotham site. Noise is not an issue as long as spool improves significantly.

BTW, can someone confirm whether 60-1 = T04S = HKS T04S and T61 = GT35/T04(hotside).

 

Anyway, the more I research my options the more confusing it gets. Here is my Top 10 list (not to mention the kit variations). Ranked by my set of preferences (reliability, streetability, low-boost (12psi), quick-spooling (12psi at <3,500), flat torque band, RWHP ~375; I do not care about emissions or cost, yet):

1. Garrett GT3582R (aka GT3540R aka GT35R; dual bb)
2. GR63 (Garrett T04R bb) -> thx Jason
3. Mitsu TD06-G25 (bb?)
4. IHI RX6 (dual bb)
5. Garrett GT3574 (aka GT35/T04, single bb)
6. 60-1 (Garrett T04S? single bb?)
7. T61 (turbo???; no info, but probably better than my GT40)
8. Garrett GT40 (non-bb; my current setup)
9. BNR Stage 3 (twin, bb?; nice specs but too cumbersome to go back to twin)
10. Stock twins

Perhaps, the TD06 shouldn't be ranked above the RX6, but I am giving it high marks for reliability and serviceability (remember I live in Korea, where everyone is running this setup)

Feel free to comment on this list, but please remember that this list is based on
1. my personal preferences (see above)
2. my current setup (see vbgarage)
3. my limited knowledge (read my posts, haha)

 

The GR63 is dual bb and sized more along the lines of the 35R, the turbo Jason mentions is most likely the GR67.

Just to correct one other thing, the Garrett GT3574 is journal bearing.

You mentioned reliability and servicing in your area for the TD06, seems like that may be a good choice for you just based on those facotors alone. I have a customer with a fubar'ed Greddy T-78 and am having a hell of a time finding parts for it. Remember, you have guys here in the U.S. giving you advice

 

Sounds like the .82 GT35R is what you would want. I have never seen a single turbo spool as fast as that turbo.

We have had majestic turbo rebuild a few T-78's. Have you tried them?

Jason

 

Yup, the T-78 is at majestic now, they claim they can't find parts. It needs a new CHRA, in addition to the bad turbine wheel the shaft is bent as well.

 

This may sound a bit ridiculous and general, but is there a Writeup anywhere on how to install a Single turbo? I hate vaccum hoses.

 

No one has ever made a write up on taking out a twin turbo and putting in a single?

 

remove twins, drink beer, install single, drink more beer, sober up tune ecu kill chevy's

O-warie.

seriously there are two many variations for one document to encompass what you are aksing for.

kenn

 

Hi,

I RECENTLY PURCHASED THIS TURBO FROM SOMEONE IN THE US. COULD YOU INFORM TO ME THE SPECIFICATION OF THIS TURBO ? THE PREVIOUS OWNER DOES NOT KNOW AT ALL. I DO REALLY NEED THE SPECIFICATION FOR TUNING PURPOSES. REALLY APPRECIATE IF YOU COULD REPLY ME. THANKS A LOT.