Garrett GT25R vs. T3/T04E
Garrett GT25R vs. T3/T04E
What would be the major differences with these turbos? My dilemma is I want a big turbo for around 350-400whp on pump gas. I like the sleeper look so I don't particularly want to go with a top-mount. However, it seems the largest bottom mount I can get is a GT25R, which is rated at 450hp (.86 A/R). I can get that turbo with an external gate and everything for about 2000. The Enjuku kit is what I’d get for a top mount 2650. What would be the major differences/advantages of each?
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MadSideways
- Posts: 160
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- Car: Cars, women, drifting...the usual...heh
For your power goals I would go with either the gt2871r or the HKS GT-RS, with proper mods and tuning will get you 400whp, they also use the t25/28 flange, and they spool better because they're properly matched.
A gt25r will also work, and get you to 380-390ish with the right mods and tuning. IMHO, the t3/t4 is alot of work and it will have noticeably more lag than the above turbos.
A gt25r will also work, and get you to 380-390ish with the right mods and tuning. IMHO, the t3/t4 is alot of work and it will have noticeably more lag than the above turbos.
I don't know how a gt2871r is a better match than a gt25r...the compressor is larger and the turbine is the same. Maybe it's a different 'style' compressor and a smaller housing...can't find much info on it but I do know the compressor has a larger wheel (71mm v 60mm according to ATP). Time will tell with this one (so put yours on already).
The GT-RS is supposed to be basically the same thing as a GT2871r...hp level variances would be splitting hairs IMO. Price is insane on a GT-RS though.
As for your spool comment...the Enjuku T3/T4 kit spools spot on with most of the GT25r dynos I've seen and makes more power on the top end. It also allows for more room to grow. One could even upgrade the kit by ditching the T3/T4 in favor of a newer GT series turbo that should spool even faster and make more power up high. It is significanly more money to go top mount though especially if you want a GT turbo.
The GT-RS is supposed to be basically the same thing as a GT2871r...hp level variances would be splitting hairs IMO. Price is insane on a GT-RS though.
As for your spool comment...the Enjuku T3/T4 kit spools spot on with most of the GT25r dynos I've seen and makes more power on the top end. It also allows for more room to grow. One could even upgrade the kit by ditching the T3/T4 in favor of a newer GT series turbo that should spool even faster and make more power up high. It is significanly more money to go top mount though especially if you want a GT turbo.
Note that the 400hp rating on the GT-RS is flywheel HP not wheel hp. The same goes for the GT25R. 400-450 fly hp.
I have not seen many if anyone break 400 whp with the GT25R. I still like the turbo and plan to get one soon. Now that I think of it you might have a pretty good chance running the external wastegate. It seems like the one guy I saw that was made pretty big gains over the internal gate.
I have not seen many if anyone break 400 whp with the GT25R. I still like the turbo and plan to get one soon. Now that I think of it you might have a pretty good chance running the external wastegate. It seems like the one guy I saw that was made pretty big gains over the internal gate.
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USDMSTALKER
- Posts: 137
- Joined: Fri Jan 09, 2004 8:29 am
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HOW ABOUT THIS MANIFOLD WITH A T4 OR T3http://www.store.yahoo.com/pha....html
That is a nice mani. I like it better than the Hotshot.
I think you can make 400whp on the GT25R .86A/R, but it is much harder and requires mods like the Greddy IM and other stuff to get you over the top. Now if you are going to be running race gas I wouldn't think it would be a problem. The t03/04 can reach the desired power levels easier IMO. I smell GT3037 or a GT30R (like goatlong is going to run). The 3037 is even T25 flanged and external gated.
I think you can make 400whp on the GT25R .86A/R, but it is much harder and requires mods like the Greddy IM and other stuff to get you over the top. Now if you are going to be running race gas I wouldn't think it would be a problem. The t03/04 can reach the desired power levels easier IMO. I smell GT3037 or a GT30R (like goatlong is going to run). The 3037 is even T25 flanged and external gated.
VitaminT wrote:That is a nice mani. I like it better than the Hotshot.
I think you can make 400whp on the GT25R .86A/R, but it is much harder and requires mods like the Greddy IM and other stuff to get you over the top. Now if you are going to be running race gas I wouldn't think it would be a problem. The t03/04 can reach the desired power levels easier IMO. I smell GT3037 or a GT30R (like goatlong is going to run). The 3037 is even T25 flanged and external gated.
So I can run a 3037 on my stock manifold. Do you knwo where I can find one? I'd rather work with my stock if I can.
I was gonna go with a GT3071R if I went top-mount
I am not too sure on where to get one, but if I am thinking correct only the 3037 by HKS has the T25 flange. The Garrett ones have T3. I am also not sure on size if it will fit bottom mount, but the compressor shouldn't be too much (if any) larger than the GT25R. After all the hp limitations on the GT25R are because of the small turbine housing. Even if it does have that fancy NS111 wheel or whatever.
You're right, they do have a T25 flange version of the 3037. I wonder if it'll fit.... I also have ac and power steering, will that stuff get in the way? How much power do you think the 3037 will support?
http://www.hksusa.com/products/?id=713
http://www.hksusa.com/products/?id=713
I don't know what the 3037 will support. HKS has the fly HP numbers on the site, but that dosen't mean that you can get that in real life on your SR.
Read this. One of my favorite threads ever. Has good info on the GT25R vs. T3/04 vs. GT28RS (disco) vs. S15 T28.
I think you are going to find , as I did, that for 350-400 whp there is not a better bottom mount turbo on the market.
You will see that the post says that a GT25R .86A/R and a T3/04e 50 trim will spool about the same even though the GT25R has the BB center section. They did mension that the 3037 spools much slower. Take a look. Pretty long post, but very good info. Let me know what you think when you are done.
Read this. One of my favorite threads ever. Has good info on the GT25R vs. T3/04 vs. GT28RS (disco) vs. S15 T28.
I think you are going to find , as I did, that for 350-400 whp there is not a better bottom mount turbo on the market.
You will see that the post says that a GT25R .86A/R and a T3/04e 50 trim will spool about the same even though the GT25R has the BB center section. They did mension that the 3037 spools much slower. Take a look. Pretty long post, but very good info. Let me know what you think when you are done.
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Movingviolation240
- Posts: 1681
- Joined: Thu Apr 25, 2002 2:26 pm
- Car: '95 Nissan 240SX 400hp SR20DET -SOLD
'93 Lexus SC300 w/ SP66 turbo kit
email me at [email protected] to discuss payment details and shipping options. Very interested.
In that thread on freshalloy a place dynoed:
stock SR20DET RWD, GT25R .86 A/R, hks 264 step 1 cams.
361 Hp @ 17.5 Psi.
That's what i'm looking for. Could I put those #s down on pump gas? That's really what i'm looking for. But I want to run deep into the 13s on just 8-9psi, what do you think it would put down at 8-9psi, right now I can run 13s at like 12psi.
stock SR20DET RWD, GT25R .86 A/R, hks 264 step 1 cams.
361 Hp @ 17.5 Psi.
That's what i'm looking for. Could I put those #s down on pump gas? That's really what i'm looking for. But I want to run deep into the 13s on just 8-9psi, what do you think it would put down at 8-9psi, right now I can run 13s at like 12psi.
I think you can make more than that on 17.5psi with that turbo. I have seen one guy make 389whp on 93oct. For the .86A/R I would suggest running 740cc injectors. I can't remember if he was running those or not.
I have no idea what it would put out or track times at the lower boost. Just guess I never though about running 8-9 when I could safely run 17.5.
I have no idea what it would put out or track times at the lower boost. Just guess I never though about running 8-9 when I could safely run 17.5.
I'm a wuss about spooling high. I drive a lot too. Will that turbo last a while? I'll usually run it at low boost (probably 8-10psi) around town, and when I need it I want to be able to run higher. I probably drive 15k a year. Maybe less.. Probably less.
At what RPM do you think that turbo would spool?
At what RPM do you think that turbo would spool?
I think the .86 spools to 17.5 around 4200. I really think you can make 365whp with the .64A/R turbo and it will spool faster.
I would think that the turbo being one of Garrett's new GT turbos and also being dual ball bearing shouldn't have any problems. They are very effecient and also don't wear like the older thrust washer turbos.
The only thing you have to watch out for is (like Paul's case) where something from the OBX manifold fell into the turbo and ruined it. You shouldn't have a problem with the stock cast mani.
I hope I am not spreading to much bad info. Make note that this is to the best of my knowledge and I am very far from perfect.
I would think that the turbo being one of Garrett's new GT turbos and also being dual ball bearing shouldn't have any problems. They are very effecient and also don't wear like the older thrust washer turbos.
The only thing you have to watch out for is (like Paul's case) where something from the OBX manifold fell into the turbo and ruined it. You shouldn't have a problem with the stock cast mani.
I hope I am not spreading to much bad info. Make note that this is to the best of my knowledge and I am very far from perfect.