I've been thinking about going big lately and wanted to hear opinions on which set up I should go with. I want a reliable pump gas monster so I figured these two would be my best options. I've heard great things about both turbos but I wanted to find out if there were any advantages, benefits or disadvantages to either set up. I've always been under the impression they were practically identical in terms of spool up and peak numbers. Any opinions/comments from owners on a flashed or piggybacked ECU, stock head/block and valvetrain would be really helpful!

 

The 50 trim has been getting great results lately. The 3071 seems to be obsolete now. AMS 50 trim FTW. People are getting excellent spool with really high numbers, I think someone made 450+(with meth)

 

Only AMS people say this. Garrett GT turbos are about the furthest thing from obselete you can find.

I wouldn't trade my GT3071R Vishnu S2 kit for an AMS 50 tirm kit evAr. I find it very hard to believe the 50 trim kit would make more power, esp on race gas.

 

PS: RenoEvo, let me know if you get those MR rims and want to cut loose of those stockers.

 

noize.. didnt ur car make 409 whp on the dd dyno with the 3071? This would be right arround 500 whp on an ams style dyno. (dyno jet) Plus your car is using a stock manifold.. so 3071 seems pretty damn strong to me.

 

His numbers would be about 460whp on a Dynojet running 110oct., which I agree is very nice indeed!

 

stocks 9s made upto 280 whp on some dynos. where they make 225 on others. dynos are very different.

 

Seth's car made 340 whp on 93 oct. At most, this equates out to about 391whp on a most dynojets. 50 Trims typically are putting down 400whp dynojet numbers. The problem with this comparison is that they are tough to compare.

When you look at the number of 50 trim kits out there, so you very similar results. When you look at the number of 3071r kits out there....you cant seem to to find any that have been tuned and have posted up results.

Outside of Seth, I dont really know anyone who has a 3071r kit. Much less a Vishnu 3071r kit.

We need to see some more 3071r results before you can start making comparisons. And seth, if you dont think that a 50 Trim turbo cam match your race gas numbers...then you are crazy. 50 Trim have been putting that kind of power down since you before you had your little riced out prelude

Now hurry up and find me a vishnu 3071r kit dammit

 

It made 340 pump & 409 race on a DD.
I think it'd make around 385 pump and 460 race on most of the modern lower reading Dynojets.

I'm not afraid of any stock engined 50 trim car.

 

Seth is big pimping.

 

The problem, Nathan, is that saying "50 trim" is like saying "medium frame turbo". There are a billion different ways to option your 50 trim. I don't think the 3071 is some ninja turbo, but I don't think it bows to the AMS 50 trim kit either. For what my POS has, it did pretty darn great on the dyno. Stock unported exhaust manifold, stock IC, stock airbox w/ paper filter, and a piggy back ECU.

Of course some of these guys with dump tubes, upgraded intercoolers, race headers, running a stand alone EMS, and rocket fuel at 12.8:1 [IE gets the credit for coining this] are going to make more. But on equal footing in a healthy car, I'd put a Garrett GT series against a 50 trim anyday.

I'd probably rather have a GT3076 for the up top sustain on race gas, but I love this turbo for pump.

 

I tell you what, Im itching to slap on a turbo upgrade on my IX (stock everything outside of TBE) but like someone said, waiting to see results. Would prefer to go with Vishnu, dont mind paying the extra $$$. I just want to make sure Im going to get 30-40hp from the 295 AWHP (DD) I have now and Im not about to be the guinea pig.

 

You can't lose either way just get the one that is available first. They still make around the same power. Vishnu's kit can be more stealth though.

 

I would give the Buschur GT3065 a look. Seems to offer a big upgrade in top end power while still maintaining respectable spool up. Hitting it in 3rd gear at 3k in my friends car the lag while noticeable until 3500 was not bad at all, while the power after that point was enough to sell me a kit. The 3065 seems to be ideal for a stock bottom end car as it retains a large useable powerband (4k- 7800) while making its best power at or under 30psi.

 

To answer the original poster, I think the decision is pretty simple. You either:

a.) go with the Vishnu kit, in which case you'd want the 3071
b.) go with the AMS kit, in which case you'd want the BB 50 trim

On a car with stock internals, you'll be hard pressed to see the difference between the two, since both will make more than enough power to support the stock redline (even raised to 7800). On the AMS kit, the BB 50 trim (garrett and PTE housings) spools ~200 rpm earlier than the 3071 (.63 and .48 AR). Also on the AMS kit, the BB 50 trim also slightly outflows the 3071 (.63 AR) in the upper RPMs - again, not very noticeable with a stock redline, though.

As a reference point, the last AMS 50 trim made 414 whp on AMS' dyno (stock block, pump gas). I'm currently at 400whp and should see more once I'm tuned again, but I own a much more heavily modified car...

If you are ever planning on building up your block (stroker or built 2.0), then I'd go with the BB 50 trim over the 3071 and in that case I'd also take the AMS kit over Vishnu.

l8r)