Hey guys...
This is my first post here, but I have been lurking for about the last year. As of now I have your v390 package with 280 cams and AMS IC. In other words, I have everyting prepared for a turbo upgrade. The Vishnu Stage II is the way I want to go but I'm having a little difficulty in deciding between the 3071 or 3076. On paper (compressor map), the 3076 looks like the way to go however, it appears as though a lot of tuners are having difficulty extracting the power from that turbo. I do like the 3071, especially the spoolup but I just want a little more...you know, have my cake and eat it too. Now there is the option of the 3037, but isn't the 3071 an upgrade from the 3037 and isn't the 3076 supposed to be an upgrade from the 3071? Man, I'm confused. Hell, who knows...maybe I just need a TME turbo!

 

lol it can be confusing at first... first.. disregard all teh numbers... the 3071 is the smallest one, and it is a great pump gas turbo. if you plan to run mostly pump gas, then this is the one to go with as race gas will not give you that much more power. The 3076 is teh next choice, it is bigger but slightly laggier. you can make arround 550 crank hp with a safe tune. I opted for the 3037, which is a bit bigger than the 3076, and has slightly more top end. Regardless of which one you go wiht, you will love the new found power. I know i love the fact that i get full boost @ 3600 rpm on the freeway.

 

OK, so it sounds to me you really like to run the high octane go-go juice. My goal is to have a turbo that is really at home with 93 octane for most of the time and racing fuel on occasion. So how "slightly" laggier is the 3076 from the 3071?

 

From what I've seen, most people think that 3037 is preferable to the 3076 as its about the same lag with more power.

$0.02

 

I always thought the Gt3037 was smaller then the 3076. ARE YOU SURE!

 

A GT3037 is a one variation of a GT3076. Unless you are getting an HKS GT3037, most GT3037 are just a GT3076-12.

 

Visit the Buschur forums....they have a ton of 3071, 20G, ect.... turbo dyno comparisons and what not.

My take is this.....If the stock turbo w/10.5 hotside is not enough for you....then you might as well go with the 3037. If you get the smaller of the three you will kick yourself in the **** for not getting the bigger one right from the start. Either way you are giving up stock like spool so 200-400rpm more lag wont make any difference.

What kind of racing do you primarily do?

 

my turbo set up gets full boost @ 3700 rpm in 5th gear... in 4th its liek 4000 and in 3rd its like 42-300.

 

on 93 octane the 3071 will make BIG power... so for you that may be teh way to go. even on our 91 pisstane we have seen 340-350 on a dd dyno.

 

Thanks for the help, Asita! The 3071 just isn't for me. The power to dollar ratio is not quite as high as I would like. For the street, I think that a 1+ car (with race gas) is just as potent as a 3071 on pump. On a road course that is a different story, I know. I just wanna street beast that occasionally sees a road course or parking lot cones. The issue I have seen was a RNR 3076 kit that made LESS HP and torque than the stock turbo did. The car had all the supporting mods and was tuned as well as it could be. The problem was never really fixed so the owner just stepped up to a GT35R. We suspect it was more of a turbo issue rather than the kit itself being bad. Anyhoo, the 3037 lag sounds like something I can tolerate because my stock turbo with the 280's lags just about as bad... . Can I assume that the kit will come with a 93 and 110 octane base map?

 

A GT3076/3037 will be unacceptable for parking lot cones. There is too much lag in the 1st & 2nd gear when compared to a stock turbo.

 

I agree ....but people looking for bigger power "400WHP" aren't really autocrossers at heart. You can still pull of high speed lapping days with the bigger turbo but odds are these fellas are primarily stop light/straight line racers.

I've driven a 3065 (GT35R based) turbo car and its completely streetable. If you are drag racing you can spool them at the line so it makes no difference. If you want to know what it feels like just change your boost map to only make boost at 4k and up.

 

My 3076R made 424 AWHP dyno jet at 21 psi, I am adding alky soon and will update you guys. The 3076R can make big power if tuned properly on 91, although it shines on race gas or alky.

 

Amen, brother...you hit the nail on the head!

 

What sort of tq are u guys with 3076's making, fwiw im making 385whp on a dynojet at 20 psi with my 3076.

Scorke