Should I get the Garrett t3/t4oE turbo?

Post by **DonDonati88** » Mon Jan 20, 2003 10:15 am

hey I will have a s13 redtop next month. I want to net around 350hp (and not boost more than 14 psi). I know I can't do that with the stock turbo. So I was thinking about upgrading. Is the Garrett t3/t4oE turbo a good choice?. The one I am looking to buy has a T4OE compressor housing of .70 and a T3 turbine housing of .48. Are these numbers good? No major lags or anything?

I will have the following mods:

1. 480cc s15 injectors2. Greddy V-SPL FMIC3. 3 in exhaust4. 3 in downpipe5. intake5. reprogrammed ECU6. walbro 255lph hgh flow fuel pump7. ACT Street Clutch

Thnx for any input.

Post by **Daunttless** » Mon Jan 20, 2003 10:15 am

What are the wheel trims on it? Is it ball bearing? You'll also need a new manifold.

Post by **DonDonati88** » Mon Jan 20, 2003 10:15 am

I dont know the actual wheels sizes, but the compressor wheel has been upgraded ( to a Stage V, I believe). The turbine wheel has also been upgraded, not sure to what, but I believe it has been clipped

Post by **DonDonati88** » Mon Jan 20, 2003 10:15 am

Here's a pic:

Post by **Daunttless** » Mon Jan 20, 2003 10:15 am

I have no way of telling you how much power it will put out without the trims, same with the lag. : ( I can guess, but it may be complete off.

Post by **Daunttless** » Mon Jan 20, 2003 10:15 am

If it's a stage 5 turbo, it's way overkill. You're going to be boosting extremely late.

Post by **Onizuka** » Mon Jan 20, 2003 10:15 am

DonDonati88 wrote:I will have the following mods:

1. 480cc s15 injectors2. Greddy V-SPL FMIC3. 3 in exhaust4. 3 in downpipe5. intake5. reprogrammed ECU6. walbro 255lph hgh flow fuel pump7. ACT Street Clutch

Thnx for any input.

I belive s15 injector are 444cc not 480cc, not that big a difforence but i guess it matters...

Post by **Daunttless** » Mon Jan 20, 2003 10:15 am

S15 Injectors are 480cc.

Post by **Onizuka** » Mon Jan 20, 2003 10:15 am

my bad...

hey daunt, are you going to offer new or used s15 bb turbos?

Post by **Daunttless** » Mon Jan 20, 2003 10:15 am

probably used ones.

Post by **DonDonati88** » Mon Jan 20, 2003 10:15 am

for how much?

Post by **Onizuka** » Mon Jan 20, 2003 10:15 am

damnit when is your next engine shipment coming in? My wallet is overflowing and all of that money needs to go somewhere:naughty

Post by **Daunttless** » Mon Jan 20, 2003 10:15 am

I don't know when my next shipment will be here, and the S15 turbos will probalby be about 900 dollars.

Post by **DonDonati88** » Mon Jan 20, 2003 10:15 am

this is the description the seller has for this turbo:

Did you read the specs on the turbo? I had put up an ad earlier, but had to correct it. Here it is:It has a T4OE compressor housing of .70 and a T3 turbine housing of .48. I dont know the actual wheels sizes, but the compressor wheel has been upgraded. The turbine wheel has also been upgraded, not sure to what, but I believe it has been clipped. I'm not sure whether the turbine wheel is a Stage V or not (I took this off my ad later on)The turbo would be great for anyone interested in fast spool and off the line power (because of the .48A/R on the turbine side). It should provide plenty kick down in the low end, with and a nice strong powerband.The turbo comes with a internal wastegate, that is good to 30+ psi. The turbo is rated at 400+ hp and provides more than 550 cfm (I believe that is the right unit). And of course it has Garrett's unmatched quality.

Post by **Daunttless** » Mon Jan 20, 2003 10:15 am

OH, wait a minute, I read that backwards. A .70 Compressor and a .48 Turbine, that's backwards, or at least I hope it's backwards because I can't imagine that would be a very effective turbo.

Post by **DonDonati88** » Mon Jan 20, 2003 10:15 am

Ok, so I guess I wont purchase this turbo upgrade...

Post by **Daunttless** » Mon Jan 20, 2003 10:15 am

Nevermind, I take that back, it struck me as unbelievably odd for a moment. Give me a second, I'm making some guesses.

Post by **Daunttless** » Mon Jan 20, 2003 10:15 am

Ok, was looking at my flow maps and I don't think that that turbo would be a good choice without knowing it's trim. with a .70 A/R compressor and a .48 A/R turbine, you'd need to have very specific wheel selection in order to maximize efficiency without choking the turbo due to the large compressor side, and too small turbine side. If it were a .63 or .64 A/R turbine, it would be a better turbo, but for more power than you're looking to produce. That turbo will produce the power you want, I just don't know how efficiently or how soon, I'd imagine it boosts in the 3500rpm range which is a bit high for the power output you're looking for. : )

Post by **SRdS14** » Mon Jan 20, 2003 10:15 am

go with the garret t3/to4e .82 AR, 60Trim. its what i have. you'll also need to get a new manifold (t3 flange). when u do that, you'll hafta get an external wastegate. piping (downpipe, wastegate extension, etc), lines and fittings. i just did all this in my car...its worth it. i know i'm way over 350. i also have tons of other stuff too though...

Post by **Yellow4g63** » Mon Jan 20, 2003 10:15 am

60 trim with a .82? sounds like a lag monster.

Post by **SRdS14** » Mon Jan 20, 2003 10:15 am

give me two days...i'll letcha know where it spools.

Post by **nismoinvader** » Mon Jan 20, 2003 10:15 am

Daunttless wrote:That turbo will produce the power you want, I just don't know how efficiently or how soon, I'd imagine it boosts in the 3500rpm range which is a bit high for the power output you're looking for. : )

Actually, I was looking at this turbo myself in the classifieds. According to my research, the turbo should spool up pretty nicely (although it is hard to tell without the exact wheel trims). I would say you should see boost pretty much instantly and off the line.The classified pic shows the turbine wheels to be clipped. That should add to higher flowing characteristics on the upper end as well.

Any turbo gurus want to comment?

Post by **WDRacing** » Mon Jan 20, 2003 10:15 am

With such a small AR the spool will be quick. The only problem I forsee the AR being to small and constricting the exhaust flow at higher rpms. But if your only aiming for 350, it should do just fine.

I've never seen a Hybrid turbo with an internal wastegate. Nor have I seen an internal gate come close to handling 30 psi.

The CR side looks strange in the pic, like the intake piping will be larger then the impellar housing. I'm thinking that will mess up your airflow a bit.

WD

Post by **C-Kwik** » Mon Jan 20, 2003 10:15 am

I'm running a T04 Turbine with a .69 A/R which should flow more than any T3 Turbine. In first I probably hit my max boost of 6.5 PSI at about 4000 RPM. In higher gears, I can hit 6.5 PSI as low as 3000 RPM. I don't consider my turbo to be laggy at all. I don't care if it starts spooling at 2000 RPM. Actually, I'd be willing to sacrifice some more midrange for more top-end. But that will be later when I get my fuel system the way I want it and am ready to really have fun. I'm sure even the .82 A/R T3 Turbine will spool rather quickly. Think of it this way. The Overall turbine size makes the biggest difference. The A/R is more of a fine tuning thing. You'll notice a difference but it will not be drastic.

Post by **nissan_s14** » Mon Jan 20, 2003 10:15 am

Hello all,

I am the owner and seller of the turbo you guys are talking about. Let me see if I can clarify a few things up.The compressor is stamped A/R .70 and the turbine has a .48 stamped on it. The turbine wheels have indeed been clipped. The compressor wheels have 6 dual fins (if that makes any sense). I am unsure what the exact wheel specs are. I assume you can get the wheel trim by measuring the wheel diameter?When I bought the turbo, I was told that it would support 400 hp easy, flow 550cfms, and the wastegate would handle ~25+ PSI. Because the turbine is fairly small, it should result in quick spooling characteristics, with fast response in the low rpms and a broad power range. For the upper rpms, I was told because the turbine is clipped, it should allow for better flow.If I can be of any more help (taking pictures, measuring diameters, etc.etc.) please let me know.

Thanks!

Post by **Yellow4g63** » Mon Jan 20, 2003 10:15 am

ahh a .48 never mind should spool real good.

Post by **Dori Dori** » Mon Jan 20, 2003 10:15 am

A .70 a/r could net around 400whp...not much more than that though. Also, a .70 a/r should reach full boost aroud 4000 rpm.

Yes, a/r does make a big difference on spool and lag.

Also, C-Kwik, I'm guessing that you have a KA. Displacement makes a big difference on spool characteristics.

Don, the only thing that will hold you back with this setup is your injectors.

Post by **DonDonati88** » Mon Jan 20, 2003 10:15 am

Ok, so scratch the 480cc from the s15 (which I can get a good deal on), and just go all out with the 550cc injectors for this setup?

Post by **Dori Dori** » Mon Jan 20, 2003 10:15 am

I would. It's safer and in the long run, if you end up wanting more, you can have it.

Post by **DonDonati88** » Mon Jan 20, 2003 10:15 am

Ok I am seriously thinking about getting this turbo. Do I have to get a new manifold immediately? I am planning on getting the ecu reprogrammed and getting 550cc injectors, along with fmic, and walbro fuel pump, will this set up be ok?? I probably will only boost like 10-12 psi. Only looking for about 350rwhp really.

Should I get the Garrett t3/t4oE turbo?

Should I get the Garrett t3/t4oE turbo?

Re: Should I get the Garrett t3/t4oE turbo?

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