Rep Power: 235

I have a few questions about turbo's. I've read just about every thread that came up when I searched for T25, GT28R/RS, and T3/4. I'm lookin to make somewhere between 200 and 300whp. Yeah, I know that's a very wide, wide margin, but I'm planning this out based more around turbo selection rather than HP. Questions:

You can get the Disco Potato from ATP Turbo with a T3 hotside and .48AR. Is the Disco Potato overkill for my HP goals? Would a regular GT28R Suffice? I've seen numerous posts from one person who runs it on here.. can't remember who.. but yeah I did see it. I'm set on a GT28.. T25's are too small and OEM turbo's as far as I'm concerned. T3's are too big IN MY HUMBLE OPNION for what I'm going for. I know a T3 will flow enough for 200-300+, but to me the T28 can flow enough to reach those goals as well, while also shifting the power band down some for me, and putting more area under the curve, rather than dead till 3.5-4k and a bunch of boost. I know it's based of a T25, but I see it as a great cross between the two. Fast response, but high hp capable. The T3 does have more upwards potential, I know, but then then that's why I'm asking about the difference between the 28R and disco potato. Also if I got that disco potato with the T3 hotside, would that bolt up to a Dezod log manifold? Would the hotside be in the same position so that I could use his downpipe? I'm assuming I could clock the compressor side to get his charge/intercooler pipes to fit. I'm not looking to piece together an entire kit here, but I do want to select which turbo I use. I know dezod sells both the GT28 and GT28RS, but it doesn't seem to come with that T3 housing and .48AR option that you can get at ATP. I would like to use his kit, and just sub this turbo in instead.

Second question, how much does a used civic short block cost? A1 or A2. My engine only has 58k on it so far, but, I like to build the engine outside the car, so my cars not out of commission.

And lastly. How the hell did it get named the Disco Potato.

 
Rep Power: 424

Several people do, me being one of them.

A GT28 is a T25. So is a 28RS. You just happen to be able to get a T31 housing for it.
The GT28R and RS (the potato) share the same hot side wheel, the RS has a larger compressor. I think the bigger compressor adds another 50 max HP.
Either one will be fine for 300, but you'll run into some other barriers with the motor before the turbo maxes out. I hope you are also aware that there are FOUR turbos that are considered the "GT28R". So be mindful of which you are actually buying. The trims are all different. The GT2560R-1 is generally considered the standard one. Then there's a 2560R-3, thats an OEM S15 turbo, the AR on the hot side is a little larger, ther'es a 2560R-9, thats a Skyline turbo, both wheel trims are different, and the 2854R which has different trims and A/Rs.
You are grossly misinformed about this turbo is too big, that turbo's too big...."T3 is too big" is junk.... there's T3's that are smaller than the 28RS. The 'T' sizing and the GT sizing are not comparable. The "T" number is more or less just the flange on the turbine, its got nothing to do with the size of the turbo, you can get a GT30R with a T25 foot. Why? Who knows, but it can be done.
It may or may not bolt right up. The foot will, but the size and shape of the housing on the GTs is a little different, you're going to end up fabricating your own downpipe.
A 28R spools nearly instantaneously, I wouldnt see the RS to be too far behind.

 
Rep Power: 327

yup, yup, what he said ^^^^^ my gt28r is insta spool

Now were cooking with gas....This is what you should get!

GT3071R-WG Dual BB, 86AR, 90 Trim Turbine
http://www.atpturbo.com/Merchant2/me...egory_Code=GRT

 
Rep Power: 235

Hi boiler. Purdue fan? Thanks for the response. It was you, or you were one of the ones I remember. One of the posts I read through was the one where you had your nice box opening of the 28R from Garret. Pretty box. I believe there was someone else with a black civic in their sig who was running a GT28, or a 25? He was very helpful in this forum as well. Anyhow.

As for the turbo's, where I would be getting them from, what specific kind, either ATP or Dezod. I should've referenced them instead of being vague.

Garrett GT2560R/GT28R:
http://www.dezod.com/pd_garrett_gt28rs_ball.cfm
http://www.atpturbo.com/Merchant2/me...egory_Code=GRT

Garrett GT2860RS/GT28RS:
http://www.dezod.com/pd_garrett_gt28rs.cfm
http://www.atpturbo.com/Merchant2/me...egory_Code=GRT

Now, even amongst those, there are differences between them. I suppose dezod and ATP simply spec them differently for their own sale. The two GT28R's are identical, except the ATP one has the option of a .48AR turbine, but that option is only available on a T3 turbine housing and loses the internal wastegate. I believe with the .48AR/T3 housing option, that should bolt up to dezod's log manifold. However, the standard 64AR from both dezod and ATP will have to mate with the HKS T25 footed flange. I prefer the .48 for the faster spool up time. What's the downside to turbine AR's? If I understand the compressor side, the higher AR tends to take a while to spool up and compress the air, but ultimately can compress more air. The lower AR is more responsive in getting up to speed but has a lower capacity to compress and flow the air. Is there some kind of trade of like that as well on the turbine side? As for the 28RS, ATP has the identical one as Dezod, but more turbine wheel options. They have the same .86, but also have .82, .63, and .48 available for T3 turbine housings. It seems the .48AR for the 28R has to be used with an external wastegate, hence why I would like to use it with the dezod manifold, since it has a bolt for a 30 something mm wastegate and will mate with the T3 housing. for the 28RS it seems that even the T3 housing option uses an internal wastegate.. or atleast on the website it doesnt state it requires an external wastegate. If that's the case I can still use the dezod manifold and just get the block off plate.

Also, I suppose either way I would have to get the downpipe custom fabbed. Big boo there. I would still purchase the charge/intercooler pipes and try to get those modified instead of fabbing totally new ones. I expect the routes to be similar, although not an exact fit. Like anything is ever an exact fit..

As for the motor, I have forged rods, would need pistons, sleeves, and I'm debating a block guard. That will be done BEFORE the turbo. I'm a big stickler on planning and doing things in the order I need them. But I know I can't plan out every last tie, grommet, hose, etc, hence the desire for dezod's kit minus the turbo. And minus a few other things.

Another one of my worries is the fuel system, would a walbro pump and srt4 injectors be sufficient to support 250 hp? What's their cieling? I know RSX engines will most likely lock if I try to use those. I would like to keep the fuel system simple with just those two upgrades and managed by standalone, not interested in converting to a return fuel system.

Anyways, I know this is more of a paragraph than a question, but if you or anyone could just kind of verify what I've said is correct or incorrect. I apologize for the essay. Hope I didn't ask any questions that've been already answered, but I did search rather thoroughly.

EDIT: Also, I tried searching for this but couldnt find anything relavent. Log vs Equal length runner exhaust manifolds? Advantages, disadvantages, comparisons. Aside from price ofcourse. I'm po' right now, because I just finished building a new gaming rig, but I do have a steady job and financial aid checks galore, and I'm a patient man. That being said, I don't mind waiting to save up to get a more expensive manifold IF it's worth it, aside from the fact that its pretty and I can call it medusa and pet it when not hot.

Also TFNAFF, thanks for responding, you helped me out with my other questions as well. That is a nice turbo, but it doesn't seem like I would use that to it's full potential? Couldn't I get Disco Inferno and achieve the same results I desire? 250-300whp? I say that now, but a year or so from now when all this is done.. I'll be wanting more..but the 2860 and 2560 seem like good starting points for now. Although I'd like this to be a one time, meticulous, done right installation, especially if pipes will have to be fabbed. So I don't plan on changing anything later on.

Also, did the two of you custom fab your downpipes? I presume you did, just wanting confirmation.

 
Rep Power: 327

yes the disco would prolly be more than most would ever need.... and the Yes i made my DP....

 
Rep Power: 265

no one mentioned :: gt2871r // gt2876r ??