Ryde _Or_Die

I know everyone has these questions, and I did search. I am looking for 450rwhp in my TII with a streetported motor. Can this happen with a T04S or not? When will it spool up all the way? If you could, help me with the exact specs I'd want. Heres some stuff I think I would want:

Close to a 1.00 A/R
360 degree thrust bearing
60-1 trim(or larger?)
fully divided turbine housing


What else exactly? How do the A/R's work(I know you have 2), so how do they affect spool up and max HP? Do I need a larger "trim" than 60-1(62-1 or something else)? Like I said I am looking for 450hp tp the wheels and full boost ASAP, preferrably before 4k. My plans so far are a fully divided SS T4 manifold and HKS standard wastegate with this turbo. If there is some other turbo that would work better and fit on a standard T4 manifold please post it up. Thanks.

in2twins

I think you will come up short. A T66 Q trim divided .81, or .96(I'm not sure which, I have the .81 but not installed) is the ticket IMHO. A TO4R or a PT67GTQ in a .81 ar may also do it. Carl

Ryde _Or_Die

Well how close can a T04S get me?

Carl Byck

425 with PERFECT tuning. But you are making some heat that you would not make with a little bigger turbo. There are some dynos to almost 440, but they are pushing everything, not a set-up you would use every day IMHO.

Ryde _Or_Die

So would 400rwhp be easily attained though? What RPM could I get full boost, and what boost level would I be able to peak at safely(and on pump gas if possible)? If I need to, I will run a small shot of N20 to get the results I want for the track. This will be a pretty much street car though, so spool up and drivabilty are definitely concerns.

Ryde _Or_Die

Also, I wanted to know why people choose To4S, over a T04B or T04E, yada yada yada or how people determine which they want. Also, could you recommend the exact specs I would be interested in more than likely? (A/Rs, trims, everything.) Thanks alot.

Ryde _Or_Die

bump

Matlock

Here's my opinion of the exact specs you should get. A T04 with a 60-1 compressor in a .70a/r housing. For the hot side a p-trim, tang. undivided in .96a/r. Get a watercooled center section. Mate that to an Hks cast manifold and your in business. Except for oil feed and what not.

Those specs are exactly what I have so, that's why I would recommend it. I don't have enough experience with other turbo's to recommend someting else.

I have only recently started full throttle runs and I find boost on around 4k. I haven't been able to pin it down and haven't been on a dyno. The power is sweet as hell, and easily would pull to 8k, I find myself shifting at 7,500. I am only running 10# currently so, there is a lot more to be had out of this thing. As for 450rwhp, it may or may not be possible with this turbo. 400rwhp, yes, but 450 seems pushing it to it's limits. If 450 is indeed what you want, go with a T66, it will have no problems achiving it.

The engine is ported by myself so I would call it a medium port. I went rather large on the primaries so, low end is non-exsistent. I hope some of that info helps. I went through most of this 3-4 month ago. I went with Cheapturbo as I've told you before.

Ryde _Or_Die

I like your turbo, only thing is I have heard a fully divided manifold and turbine housing will spool up faster and give a little better top end. Is that not true? I ask because I can get a great manifold for like $100 more than the HKS one and it will be all SS.

Matlock

Oh, if you have access to a divided manifold, by all means go with that and a 1.0 divided turbo. It will spool a little quicker and that's always good.

Ryde _Or_Die

Ok, so when you say get a T04 60-1, what turbo would that be? Is it a T04E, T04B, T04S? I always have wondered that, like what exact part of a turbo does the "T04S" "T04E" etc, represent. Sometimes I see that part left out so I have been getting confused.

Also, you say get a divided turbine housing with a 1.00 A/R, correct? And you say to get a .70 A/R for the compressor side, right?

Now, is there a big difference if I went with a 62-1 instead of the 60-1? Or even a 68-1?

Oh and how large is the inlet of your turbo? Thanks for all the help.

Ryde _Or_Die

Ok, I might have been able to answer my own question I guess by poking around turbonetics website. I am taking it from their info, that the 60-1, and 62-1 are T04B's, correct? Now if thats so, what are the differences performance-wise of going with a T04S?

Matlock

Alrighty! The T04E as far as I know is designed differently than the B. The E is a newer design. When I went through my research, I called a few places and asked for a T04b with 60-1 wheel and all the specs I wanted. All said, "Oh the T04s" yeah I guess. So my understanding is a T04 with the specs 60-1 compressor and what not = a T04s. Essential with the specs it doesn't matter in my opinion if they give you a B or an S because it's the same thing. The E is not though (smaller inlet.)

Yes a 1.00 tang. Undivided turbine and a .70 compressor would be perfect. Maybe a 1.15, but there will be more lag, but a little more up top.

I think in your case if you want 450rwhp a 62-1 would be good. I hear about 10% for air flow. Any turbo shop should be able to build that as well. Now the 68-1 I know nothing about in terms of increase lag or more flow. Sorry.

The inlet on my turbo is 4".

Ryde _Or_Die

Thanks alot for your help.

Now, do you know what would happen if I went with a larger or smaller A/R for the compressor side? I realize that the A/R when dealing with the hot side, will give you better or worse spool up and better or worse high end. Does the A/R for the compressor side do the same thing?

And last thing I need to figure out is the turbine wheel trim? Would I want a P-trim? Thanks again for all your help.

Matlock

I am not an expert, but I would think that a smaller Compressor side would increase spool and a larger vise-versa. As for turbine wheel, P-trim for a better spool and a q-trim for more power and top end. I went with p-trim for some spool, but q-trim might be what your looking for if you want over 400rwhp. I'm glad I can help, atleast with what I know.

Ryde _Or_Die

Alright man, thanks a lot. Only thing I am worried about now, is boost dropping off. In my current car, I can max my boost out at like 3 or 4 k(never really looked, but its pretty low) and my boost levels will drop pretty quickly. With a large single, can I run a constant 17psi without it dropping at all by redline? Thanks again.

wakeech

...that means your turbo is way too small for the application and can't suck enough air in at those higher rpm: think blowdryer. this should never happen with the right turbo (once peak boost is reached, it should just stay level).

it's that, or you have a bad wastegate setup, keeping the turbine from accelerating as your rpms increase??