Omicron

Yup. They too are still working on a/f management. Seems to be a common theme.

punishr

Maybe they will figure it out soon.

shelleys_man_06

I heard that Greddy's turbo kit runs on a TD-05 turbine and a TD-06 compressor. It's quite small compared to SFR's, even Rotor Master's. Does anyone think that these turbo kits be a gateway to shoehorning larger turbos, say a GT3540R? What about fuel management for this kit? Do you think this kit will utilize the e-manage?

Japan8

The kit does use E-manage and it does come with an intercooler (if I remember correctly).

Early test drives of the kit by ordinary owners were quite happy with the power/price (roughly $4k USD). This kit is supposed t push something in the neighborhood of 270hp.

Omicron

IMHO, a smaller, ball bearing turbo would be better solution here than a larger one. Smaller turbos spool up sooner, and this is what the '8 needs - boost at a lower RPM to make up for the torque.

Japan8

Exactly Omicron! All the JDm tuners are building their kits to do exactly that... beef up the low-end.

punishr

Now if we can just get the JDM guys to make kits for the US spec 8's then we'll be in business..

shelleys_man_06

Good point Japan8, Omicron . Does the smaller turbo necessitates that the kit may be inflexible? I would like to see boost levels mirror that of the FD3S, maybe in the range of 14-17 psi, 360+ rwhp. Unfortunately, the trade-off may be low-speed driveability. Aren't there other ways to increase low-speed driveability, i.e. longer intake runners?

REXNdBst

A Big 16g turbo should do it, that turbo barely has any lag and can support up to 400hp. When I had that on my DSM a 650rwhp supra couldn't catch me until I reached 115mph (raced on the track of course)

Japan8

Bigger isn't always better. If you actually believe so, get rid of your 8 and buy a Mustang GT or a GTO ("ain't no replacement for displacement"). Ford Motorsports has big block V8's available that are good for 500-600hp all motor.

Even rotarygod and Gordon as well I believe were saying that this size turbo is about the right size to match the engine and car's character. If you don't like the linear power, you bought the wrong car.

shelleys_man_06

Don't most modern turbochargers have little or no lag at all? I hear a GT3540R, which is my dream slug, has very little lag. This turbo is, IMO, the new T78. It's all in the tuning .

shelleys_man_06

rotarygod was interested in looking at my car, as he is supposedly wanting to design a turbo kit. Bigger isn't always better of course. The RX-8 will do quite well with the TRUST kit, as well as the Rotor Master. When it comes to size, I believe the SFR kit's use of a T4 turbocharger may compromise low-speed driveability. Maybe SSR can correct me on this one? I am just concerned about the flexibility of these turbo kits. It's too early to tell though.

Japan8

Yep... dat's right. It's all in the tuning. What each kit is ultimately capable of won't be known until they are out there for a little while with people tinkering and tuning them...

rotarygod

I am?


Just because one person uses a certain type of turbo does not mean that it still wasn't tailored to that car. There are RX-7 guys that use all sorts of turbos. The trim of the exhaust wheel (P,Q, etc...) and the a/r of the exhaust housing make a huge impact on how fast the turbo comes on line. We can have 2 cars set up identically, both with the same turbo, we'll say a 60-1 in this case. One car uses a P trim exhaust wheel with a .84 a/r exhaust housing and the other uses a Q trim exhaust wheel with a 1.00 a/r. The P trim car will spool up faster and make more low end but the Q trim will make more top end power. It will also be slower to respond. This is assuming the same boost levels. Even a T-04B can supply enough air for 400+ horsepower. The exhaust side of the turbo needs to be designed to flow enough through it. I will argue that the exhaust side of the turbo is more important than what compressor stage is used. There is alot involved in choosing a good turbo. Even how far it is from the engine can affect the size of the exhaust stage you may want to use. Many people don't think about this.

shelleys_man_06

Isn't it also a good idea to keep the exhaust gas velocity as constant as possible? Turbo header design also constitutes a good kit, right? I hear that an individual-runner exhaust manifold will outperform the log-type; log-type exhaust manifolds, from what I have heard, can build up exhaust pulses on the turbine side. Unequal distribution of the exhaust gases is a bad thing, IMO.

rotarygod

That is true.

shelleys_man_06

Thank you Corky Bell .

Mistryl

so has anyone heard anything about the trust turbo at all? about how much of the kit have they developed already?

Japan8

I believe that info has been posted in other threads. Did you try searching?

The kit is out JDM. USDM release is unknown... if it'll even happen. No you can't just the the JDM kit on your USDM car.... read above posts... a/f and timing management problems.

Mistryl

darn....yes, i did search. searching is how i came up with this thread, so....*shrugs*

oh well, i wonder if we'll ever get some sort of FI for the A/T. I was interested cuz i believe Trust developed theirs for the A/T.

monzter

Corky is the man. Can't wait for the updated version of the book to come out.

Japan8

Sorry about that. I keep forgetting that since the software upgrade, we seem to have lost a lot of old threads... either that or the new search engine isn't so hot...

The A/T was a "joint" project with RE Amemiya. "joint" because really Trust/GReddy did the majority of the work. It was essentially the 6PI engine turbo kit strapped onto the auto... with different tuning of course. There were some concerns about the transmission being able to take the power though...

Mistryl

hmm...interesting. I would've thought that the torque converter would be able to reliably sustain up to 250 or so hp...just something i noticed with experience. of course, i'm also wondering how they managed to ram in more air with the air restriction "problems" of the Renesis. And when I say "problems" I mean "Mazda's Over-Engineering"

Japan8

What air restriction problems are you refering to? The stock intake is almost perfect. As in the MS RX-8, all it needs is a free flow filter and a VFAD mod to get 100%. The other aftermarket intakes out now do give some gains, but mostly on the tops end and are reportedly LOUD...

If what you meant was the MAF... well all i can say is that Trust/GReddy isn't running much boost. A jump from 180ps to 275ps or so (rear wheel) according to the last reports I read on it.

Floyd

Not sure but I think there was a hint of scarcasam in Mystril's comment. the only problem in the stock intake is for the aftermarket producers trying to get decent hp increases out of it. Hence "Mazda's Over-Engineering".