SR20DET Turbo Upgrade WHICH ONE TO USE 350+ whp

[ian7321]

Alright I am in the process of getting my SR, now the only problem is that the tiny stock turbo just doesnt satisfy me and I want to go bigger, but there is a proble I really dont know anything about what turbo to use.

Now, I have a rough understanding of turbos, now I have heard that a t3/t04E turbo is a good upgrade for an SR, but I am not sure about how much HP it will make. Also I am wondering if this turbo will work with the stock exhaust manifold, or do I need to get a top mount?

Another turbo that I have looked at is the Garret GT28 turbo. But I am unsure if it will bolt right up. Because I would like to use the stock exhaust manifold.

I am also wondering how much HP either turbo makes at say 15 psi or less.

If anyone has a better idea for a different Turbo to use them please be my guest and inform me.

[robbbby]

Look at the garret GTxxx line of turbos, alot of them are t25 flanged and will make 350hp. And no, a t3/t4 will not work with the stock manifold.Take a look at the GT line listed on atpturbo.com, it will tell you roughly how much power it is good for in the turbo descriptions.

[240SXer]

Ya, i've got a GT2540R .86 A/R it's good for around 400whp. And it fits on the stock manifold.. I'm all about sleeper status though.

[RMiller]

Do one upgrade at a time. If you must do a turbo upgrade, check out a t28. If you're still not satisfied, a 50 trim would be the best, .48 a/r.

[91sr20detser]

$900.00 for a brand new gt28 , thats what i'm buying. http://www.turbocalculator.com

[msaskin]

Do one upgrade at a time. If you must do a turbo upgrade, check out a t28. If you're still not satisfied, a 50 trim would be the best, .48 a/r.

Ummm, no, a top mount is far from the best upgrade. Sure, it'll make the power, but there are TONS of bottom mount, direct bolt-on turbos that one could use as well instead of having to use a ****ty log manifold or spend $1200+ on the full-race tubular manifold. Also, yeah, a T28 would work if he wanted 300hp, but he already said he wants 350+ hp.

My suggestions is a GT2871R .64a/r. Should top out at about 340-350rwhp with a few other bolt-ons, and spool will be absolutely ridiculous. Alternately you can get the .86a/r, which will obviously make more power, but also spool slower.

FWIW I had both a GT25R .64a/r and current have a GT2871R .86a/r on my car, so ask away w/ any questions.

~matt

[PantherRacer]

what Rpm does the GT2871R .86a/r kick in at? and the GT2871R .64a/r?

340-350rwhp aye? true

[RMiller]

Ummm, no, a top mount is far from the best upgrade. Sure, it'll make the power, but there are TONS of bottom mount, direct bolt-on turbos that one could use as well instead of having to use a ****ty log manifold or spend $1200+ on the full-race tubular manifold. Also, yeah, a T28 would work if he wanted 300hp, but he already said he wants 350+ hp.

My suggestions is a GT2871R .64a/r. Should top out at about 340-350rwhp with a few other bolt-ons, and spool will be absolutely ridiculous. Alternately you can get the .86a/r, which will obviously make more power, but also spool slower.

FWIW I had both a GT25R .64a/r and current have a GT2871R .86a/r on my car, so ask away w/ any questions.

~matt

Oh, well he did say 350+ hp, which is hard to do even with a GT25R in .86. I have no knowledge of the 2871, except that I've heard it's a great turbo but probably won't make more than 350 hp, it's just too small. Is a t3 log manifold worse than the stock manifold? Also, there are alternatives to a 1200 plus dollar rull race manifold. You lose credibility when you exaggerate so extensively. "1200+" Give me a break I gave him a short-answer solution to what he wants. A 50 trim is a proven, awesome turbo that will spool decently while having a greater potential for power than a 2871. I suggested a t28 because you can pick them up used for cheap. I would rather have a 50 trim than most GT series turbos if I was shooting for big horsepower I'd get a 50 trim, if I was shooting for 300 I'd get a t28 (I have a t28). By the way, how would you compare the 2871 to the gt25r you used? Also, what would you think of an evo 16g? I think that would be a good choice as well.

[msaskin]

Hard to compare the 25R and 2871R since I only ran/tuned the 25R up to about 12psi before it gave up on me.

I'm still re-tuning for the 2871 but hopefully will be all set up for some full boost (18-20) psi runs within a few weeks. I'm busy travelling for work all this week so I don't have any time at home w/ the car to tune.

The 16G would be a great choice aside from the needing a custom manifold for the TD05 flange issue

~matt

[RMiller]

Good stuff I look forward to hearing about it. By the way thanks for the pleasant response after my rude and drawn out post.

[msaskin]

Good stuff I look forward to hearing about it. By the way thanks for the pleasant response after my rude and drawn out post.

Hehe...no problem.

Although drawn out, the point I think one gets (and I agree with) is that there really are TONS of options out there. I for one am not a big top-mount fan for a few reasons1 - log manifolds tend to suck2 - save the full-race manifold, all the tubular (ssautocrack, etc.) top mount manifolds tend to be pieces of garbage. I suppose the upside of the fact that t3/t4 hybrids are dirt cheap is that when the manifold breaks and sends shrapnel into the turbo the cost isn't too high 3 - custom o2 housing/downpipe needed unless you get the enjuku top-mount setup, which goes back to point 1, log manifold4 - heat issues. I road race/open track the car, and frankly, I was concerned about possible thermal issues w/ the brake master cylinder having a turbo mounted that close to it. I realize that heat shielding fixes this problem, however I prefer to keep things as simple as possible.

Benefits of top-mounts1 - CHEAP turbos2 - looks bling bling3 - easier to run a MAF [not a concern of mine as I'm running speed density :: no maf]

Personally I'd probably use a 50 trim w/ a stg 3 wheel if I went top mount, but for the moment I'll stick w/ the 2871

~matt

[RMiller]

I agree with the points you made. I have a CA, and when I decide to dump more money into it I still think I'm going with an ebay t3 topmount manifold. God help me. How do you like the AEM? I'm leaning towards Haltech, but we'll see. I've heard wonderful things about the 2871 though.

[msaskin]

I agree with the points you made. I have a CA, and when I decide to dump more money into it I still think I'm going with an ebay t3 topmount manifold. God help me. How do you like the AEM? I'm leaning towards Haltech, but we'll see. I've heard wonderful things about the 2871 though.

I like the AEM a lot, granted, I've also had experience tuning it for hondas and supras before. Then again, I've used the haltech e6k extensively on DSM's, and the newer versions (esp. the E11) look even better

After taking the efi 101 class (www.efi101.com) and getting some info on the autronic, I'm really wanting to try it out. Looks to be a good combination between the strengths of the haltech/motec, etc. systems and the ease of use of the AEM EMS.

~matt