T04z streetable?
 

howdy i'm looking into getting a T04z garrett with a 1.00 A/R turbine and 8.5 rotors/ street port. exhaust backpressure will be low too- southern indiana is a little different than california about somethings.

question: any t04z owners or drivers out there that drive one as a daily driver? is it streetable? i know it's nothing like stock twins. but is the boost threshold (when u see 0 psi) low enough to be fun in light daily traffic?

i have the t04z and set up picked out for a specific app but i am hoping the car can be fun to drive with that set up in more tame situations too.

to those who have driven or own t04z setups, what are your everyday experiences?
is stoplight to stoplight a chore? or do you look forward to it?

ignoring gas/cargo room, would you rather not deal with an t04z'd fd and choose the camry for trips to the grocery. what about highway?

i only have experience with stock twins driving my brother's fd so i don't know what it's like to drive larger bb singe on a rotary before. thanks for the input!

search for T04R , i'm pretty sure they are similar except the T04Z is ball bearing

very streetable with a street ported engine, mine spools up nice and early, full 1 bar at 3.8k, luv it :)

Streetable is ALL A MATTER OF OPINION!

My T51r would boost at 4500rpm, full by 5400rpm, perfectly streetable to me.

As far as grocery getter vs fd dd - I have a couple cars... the fd is for enjoying a ride when there isn't traffic or going on a cruise, or to the track, or racing.... if I am not doing any of that.. I drive the lancer. But there is always some asshat that I come across and wish I were in my fd... but then again, I don't street race anymore.

T04Z should be a fairly responsive turbo. If you're looking for 425-500 hp, with moderate port and turbo, it's a good choice.

If you want 375-450, go with a GT35r and moderate boost levels.

14.7 psi by 3800rpm on a street port? nice. so i guess the general consensus so far is: yes.

i guess streetable is a matter of opinion. but boost at 4.5k... streetable or not that must be fun when it hits. thanks .. gives me hope.

i'm still in the land of pistons. tho me and my brother have an rx7, my only big turbo experience is with 2L nissans and mitsus.

boost at 4500 on a 2L is hardly streetable because you're already going well over the speed limit before your 4 banger hits but i guess rotaries are different.

nice rpm range on rotaries...

I'd shift around 7900 to keep peak power...

My favorite turbo was my mitsu TD08, that thing hauled ass at 24psi

gt35r should full boost at 3500 rpm and very streetable

I run the T04R (journal bearing T04Z), and I get 20 psi by 4500 rpm. This is on a streetported 13BRE.

The T04R is streetable. I'd assume the T04Z would spool even faster.

read that those are streetable but i'm looking at the t04r/z. the 35R is going to run higher rpms and a little hotter than the t04z at sustained high engine speeds and lapping 11-15psi (car is going to be a road course car).

just hoping that the z might have the perk of being a dd on occasion when it's not at the track.


nice. i bet u have a lot of fun with everyday 'asshats' lookin to pick a fight if you're driving around on the street with 20psi by 4.5k

i'm guessing if 20psi by 4.5k for one of you and 14.7 psi by 3.7k for another

then it looks like 0 psi in general by ~2500 rpms. does that sound about right?

You'll be fine with a ported motor. My 500R is similar to a T04Z and at 15 psi it's a blast around town......full boost by 3600-3800 rpm, and seems to get 0 psi around 2500 ish rpm. this w/a full 4 inch exhaust.

niiice. thanks goodfella, guys. this is making me itch to get those housings and start working on the turbo.

my brother drove an 08 STI from the dealership he works at and told me he wondered what all the commotion was about on those things until he hit ~3200 rpms with positive boost then he knew.

he said that his fd is so much more progressive from vac to boost, he wasn't used to the sti.

i guess the lesson was that if ppl can call an out of the box sti streetable then a 13b 500r or t04z should be plenty streetable.. and now with some of you guys' input i have no doubt. thanks!

hey coxxoc, what rpm are you seeing 15lbs at? just wondering cause im running a t04r as well, and im up at lake of the ozarks. always nice to see another rotary running around.

also, i've heard rumors of a few guys in joplin running modded busas, T or F?

ninja edit: to contribute to the thread, i run a streetported T04R FD and consider it streetable. the Z version is only going to spool faster.

I have been trying to do some research over the last year about turbo spool time, in an effort to find a fast setup. I have seen lots of people "talk" about how their turbo sees full boost at 3000rpm. It's really hard to find support for these claims, because most people don't post the dyno with the HP/PSI values.

What I have learned from research.

1) Having an EBC over a MB will reduce the spool time of your turbo (As much as 200-300 depending on the setup?)

2) Having a larger exhaust (4" over 3", like Rich's setup) will increase spool time a small abount as well.

3) Other factors? Porting?

My questions for each of you who are making boost claims.

At what engine RPM are you seeing 10lbs?
At what RPM are you seeing 15lbs?
At what RPM are you seeing full boost?

Please show me this.

Please show me this. I have seen multiple gt35 setups and have never seen one make 15lbs at 3500 with any setup.

Please show me this. Damian runs a 500R, (which is amazing...) but spools much slower then this. He's not 4", but he's about as open as you can get. He's also running an MBC though...

I'm not trying to call anybody out (well, in a way I am). I'm just looking for actual evidence for these spool up claims.

I will post my data as well.

At the time of the dyno, my setup was running a MB which was having lots of issues keeping the boost above 15psi past 5k rpm. I hope to shave off 200-300 rpm with my new AVC-R this season.

Rotary4tw: Large Ito Ports, 3" Exhaust, Apexi Rx6a turbo

10PSI: 3200rpm
15PSI: 3600rpm
17PSI: 3900rpm

http://www.bentarnowski.com/rx-7/dyn...noRX6small.jpg

Show me what you've got...

Have you seen a t4 35r with .82 hotside on a street ported motor with no cats? My setup spools pretty quick but you have me wondering now. Im pretty sure i made 10lbs by 2900, ill have to go play with it and see when I hit 15.

Sounds wicked fast! :zip: I would love to see some proof of this. I think 2900 is in the range of the stock seq. twins, is it not?

If we really have single turbo setups that are out spooling stockers, I think people need to know about it. :noyes:

What I'm really looking for is Dyno sheets, but if you can think of another way to prove it, I would be interested! (Movie or something?)

No sheets unfortunately, Ill have to go out and make sure im not mistaken and if it is infact somewhere near those numbers I can get some sort of video.

Fast spooling turbos set ups really do exist :)

I haven't dynoed and my car isn't even running right now but here is a quote from an earlier post of mine from when I had just got back from data logging.

That is a heavily ported S5 TII stock tubo's exhaust housing and manifold w/ 60-1 HiFi compressor/ 15 deg clipped P trim exhaust wheel and 60mm external WG.

The boost used to build at a more linear rate (faster between 2,000-3,000rpm) before I ported out the manifold and turbo housing up to WG passages but the top end wasn't as good.

For good spool and good top end power run low pressure drop intake, biggest exhaust possible, a small turbine housing w/ large exhaust wheel, and a huge wastegate with WG runners that favor FLOW out the WG.

The WG is almost always done wrong for our cars, but look at it this way-

A quick spooling rotary turbo reaches the required turbo housing flow for full boost and opens the wastegate around 3,000rpm and 100RWHP- after that more and more of the exhaust has to flow out the wastegate as the volume of exhaust more than quadruples with power and EGT rise.

If you have a poor flowing WG runner design it will require more exhaust back pressure to force the flow through the WG and hut top end power.

I miss the faster response from before the manifold/turbo porting more than I like the insane top end power and so want to try the smaller runners again and put in a ball bearing 60-1 center in there as well for really good spool/response.

https://www.rx7club.com/attachment.p...chmentid=69334

nice

nice. thanks for sharing that! i guess it's good to invest in a good flowing large waste gate and i didn't really thing about that.
i always though waste gate is a waste gate and no use pouring too much money in one but i guess that's not true.

i was thinking about running boost off the spring myself.. one less thing to go wrong when road racing!

This is actually a great idea, especially if you can find a spring that is right in the range that you want to run. (Normally it's lower boost for road racing.)

That's another variable that helps with spool rate... running a spring that is very close to your desired boost level. Add that to the list of porting, exhaust size, EBC v MBC, etc...

I agree, I ran my car off of wastegate spring the entire time I was tuned making 380whp. My HKS EVC just sat there. But then again, I was running 1 bar all the time.

i'm only interested in one single good tune and if i can do it without a boost delay module of any kind it'll be one more control i have in the mess of variables u have to watch for in a good tune.

so running on the wg can help overall response if done right?

is it because there's a shorter more accurate path of vac and boost from the exducer to the wg actuator?

great turbo, IMO its prolly the best turbo for the money on an rx7. im using stock ports and making 410 RWHP at 18 psi. love it around town

Ported 88 Turbo II here... I've got the HKS log manifold and a T04S with P trim .96 undivided hotside. If I had more money I would've bought a stainless mani with divided ball bearing turbo and a bigger wastegate (I have the HKS 40mm b/c it's probably the only one still available that bolts up).

What I'm trying to say here is that the manifold and wastegate combo will definately affect spool, not just the turbo choice and porting.