hi i see the atp turbo kit they have a lot of turbo to choose,just want to know which one is good for EVO (GT3071,GT3037 or GT35/40),and i want to know is the GT3037 not good for the evo, because i see in the sport compact car magazine they have race all the EVO ,but i see the WORKS EVO using the GT3037 is as good as the other evo(you can see the dyno chat) ,so is this GT3037 is not work for EVO ,but why some people said that GT3037 is made more power than the GT3071,and i have one more question what is the diffrence of the 0.63A/F and 0.83A/F and which A/F is best for evo .
thanks for help

this is the dyno chat of all evo
http://www.sportcompactcarweb.com/f..._evo/index.html

 

so no body know it

 

Hard to understand what you mean, with such bad grammar.

 

I'm not quite sure what your asking.. But it depends on what you want out of your car.. The 3071 kit will probably have the best drivability and lower RPM driving characteristics.. if your looking for the best horsepower.. then you'd go for the larger turbo, but you will sacrifice the fun of driving the car every day with a much bigger turbo..

Also be aware that there is more to this than just the turbo upgrade.. other components need to be upgraded to take advantage of the new capabilities.

Like I said.. Decide if you want fun drivability or ultimate horsepower... It will make a difference in what turbo you choose.

 

Heres my take on it.

3071 .63 < 3071 .83 < gt35/40 .63 < gt35/40 .82

Going from most streetability to least

To me, the 3037 kit was never an option, and i don't know why. Just never warmed up to it.

 

Yeah, I have to agree about the 3037.. seemed to have the worst of both worlds in my opinion.. My primary goal has always been street fun and driving.. so I prefer the smaller turbos.. at some point what fun is a super powerful car that really needs to be revved and launched to make the most of it, I'd prefer to have the power in a range where I do much of my driving.

 

Hi,

Depends on engine.Fully stock,GT3037,Fully rebulit,GT40R.

 

All the above turbos work very well on the EVO. They are based on the very successful Garrett GT turbo series. This uses a ball bearing core with very efficient exhaust and compressor housings/wheels.

There are a few things you need to consider/think about. The GT3071 (large ish compressor housing with a stock ish sized exhaust) has had some rave revues and some bad ones. First the exhaust turbine wheel has bin “clipped”. This is when they remove a small section of the exhaust blade to help flow. This is a very crude method of generating a high flow unit. Also due to the miss match in the size of the compressor and turbine, the turbo has had problems with surge. Overall, this turbo is a bit of an unknown identity as there has bin no or little independent testing on the unit so many of the questions have not bin answered. IMHO I would stick with the stock unit which is good for 400bhp and (over in the UK anyway) you can get a ball bearing (BB) core fitted anyway to help with spool up/lag issues. If you want a little more then I would go for the tried and tested GT28. A good turbo with little lag and can produce around 450bhp no problems. Will happily run at 2.3bar all day!

The GT3037 is basically the Garrett GT30R. Again a very good turbo, efficient and (for its size) lag free. This turbo is good for around 500bhp and works very well on the 2.0ltr 4G63 but also well if you use a strocker!

The GT35/40 are monsters. They are really larger turbos. The GT35R is good for over 800bhp (Norris Designs Evo 7 runs a smaller GT3235 and get 800bhp). It will lag more than the GT30 coz of its size, but it is still a efficient turbo, happy at 1.5 bar as it is at 2.5bar! the GT3540 is the real MONSTER. Enormous flow potential, should be good for neigh on 1000bhp. Moses is using one on his 2.3 in the UK. Will make huge boost no matter what size 4G63 you have!

In short you need to make some decisions. What do you want your car to be producing? And from there pick the turbo best suited.

Hope this helps a little, Chris.

 

Chris, this is a quote from the ATP page:

"A brand new ball bearing turbocharger recently created by Garrett engineers to help fill the gap between smaller 300 HP turbos and the laggy GT3037S. The GT3071R is also one of the Garrett engineers' favorites because of its superior wheel match (between the compressor and the turbine wheel). A better wheel match means higher levels of efficiency. Higher levels of efficiency mean the turbo works less and achieves more and is happier and makes more power reliably. This is quickly becoming one of OUR favorites as well."

You say that it's a "miss match" between wheels, totally the opposite from what ATP say?

Where did you get the information that the exhaust turbine wheel has been clipped? I really didn't like the sound of that, makes me think of when you try to do some porting of the piston on your first 50cc bike in the garage using a power drill or something Going to check this with ATP.

 

heard it from some of the guy over here in the UK. Norris Design is selling the same kits over here and there is a lot of talk about the GT3071 as being miss mathced due to the fact they where getting a lot of surge problems. only what i have heard but it was from reputable guys, but then they offer other products. and what is ATP going to say. what we need is smoe independent testing!

the clipping thing was to help with the flow of the 71mm exhaust wheel. its similar size to stock i think, and that only runs to 400bhp, so to increase flow, i heard they clipped the wheel to let it flow more. but (from the Garrett site) this drimatically reducess the efficency of the wheel making it lag much more! please tell me im wrong, im only going off what others have said!!!!!!!

thanks Chris.

 

Well, I've asked ATP about the clipping thing, should be interesting to see what they say. As far as independant testing goes that would be good just hoping I wont stand there with a kit that wasn't any good. Wonder if it had been better to go for the 3037 then? Also asked about why nobody seem to get their kits even if ordered some time ago. I ordered my kit on the 10th this month and no sign of it.

 

Got the answer from ATP now and the turbine wheel is 100% not clipped, this was something used to be done on older turbos but nothing they do on the modern GT series. And the reason they have had problems shipping was that they hadn't got any turbos from Garrett but they should get a bunch by the end of this week and then they will start shipping

 

Ok, you are wrong. The GT3071R turbine wheel is 60mm, the compressor wheel is 71mm. The turbine wheel is NOT clipped, in fact it is the same 84 trim turbine wheel as used in the "other" GT30R (the GT3076R aka GT3037). Which is to say, a very good thing.

 

ok im wrong. at least we all know that they are not clipped! so what is the diffrence between the GT3071 and the GT30R????? this is really starting to hurt my head. are they using a smaller inlet side? why the slower then GT30 spool times yet making less power?

Please Help!

PS EVOVIII SWE, you going the retain the stock manifold or get a custom one made up? there is a thread on here where a guy has ported and ceramic coated his and it looks good!

 

I too would like to see more testing on the 3071 - az3er will be installing a high flow cat and eventually cams. This should provide some good data, but not enough. Hopefully we will see others with this turbo in an assortment of variations