Excellent review. The best of luck on your project car.


Carlos

 

I feel bad for raining on the parade, but that's just entirely too much lag for a 3037. Actually, that is about the same lag as the ATP GT35R kit, but with less available power.

ATP appears to be a very good company, with useful, versatile products. The compromises the ATP EVO turbo kits make in order to be mated to a factory exhaust manifold are just too much IMO.

 

It is a lot of lag, but it's also the .82 A/R housing.

 

^ That's no excuse man........... I am sorry, but for your own good open your eyes and see that 30 by 6k rpm is just redic, thats slow for 30 psi on a GT35R car.

Scorke

 

I juts don't get how you spend that much money on a car and engine build yet purchase an ATP kit. You have lag that is behind that of a 35R. It is that ATP housing, not only does it make the turbo lag VERY much, it kills teh topend as illustrated by another thread where it starts to fall off after 6000 RPM's. Just rip it out and buy another kit, Buschur, AMS, RNR, SBR, any of the following would not only make 20PSI by 4200RPM but also hold boost way up top as well.

 

I'm quite aware that the ATP exhaust housing sucks donkey ballz and I'm not blind to it's shortcomings. I originally bought the kit for next to nothing so I figured I'd give it a try and see if it would be even half decent. I wanted to try it out for myself since I don't always believe everything on these forums and I like to have my own experiences to base opinion on. In retrospect, yes I could have saved money by just buying a real kit at the time. It will be coming off and up for sale soon once I decide which turbo or kit will replace it.

 

Fair Enough sir......fair enough.

 

You have fun driving it right? Thats great you did all the work yourself. Pulling all the engine/tranny/tcase at the same time...is that how you reinstalled it as well?

 

Wow. Hasn't anybody noticed he hasn't had this tuned yet? Everyone should be saying: wow you need to get that tuned! Or you need more than stage 1 to make any big turbo sing. Oh well thats internet for you.

 

Yeah that is the internet, people make promises and then back out of them, like the sale of a AMS turbo kit. Happens all the time, just gotta get used to it I guess.

 

I have an AEM EMS that I've been learning for the last 6 months. It's certainly better tune wise, but the lag hasn't improved at all and I still need to have an experienced tuner tweak my map a little bit. I adjusted my cam gears back to 0/0 and didn't make any difference in spool either, so I'm thinking that is just the atp housing.

I don't mean to sound defensive about the kit, and I've certainly read up all the reviews of it on evom about the restrictiveness of it. It is dissapointing to hear that larger turbos are spooling up quicker and with more top end, but I realize what I paid for it. At the time it was an in-between place for turbos, knowing that I would probably swap it out later but when I had more money. After all, the turbo will be just about the easiest thing to change now.

I do appreciate all the feedback that will help me get where I want with this car, which is a track monster (road course). I've done 4 events with this setup and compared lap times. Sadly it's really not any faster than before, and in fact being about a second slower per lap. Ouch.

 

That's fine if one doesn't mind spending money to 'reinvent the wheel'. Choose your sources of advice wisely, and you'll save money instead.


Saving money by purchasing a large turbo kit that cuts corners is tempting. I was once tempted, but then I came to my senses and realized that it isn't worth giving up all that low end response unless it really kicks a$$ on the top end. I purchased a used ATP GT35R kit on the cheap, but before installing it, I ended up converting it into something that is better than anything I could have purchased off-the-shelf. If you have or have access to someone with fabrication skills, this may be an option for you.

 

I've been chatting with Full Race about converting the turbo hot side to a T3 flange and smaller A/R housing and going with their header. At that point I really just need a new downpipe, and probably lower IC pipe. I think this will be the cheapest option for a good upgrade. Plus I don't think I can get much for the ATP kit used, and the turbo is still in great shape. Anyone want an ATP downpipe or turbo hot side?

 

Kyle, looking at your boost numbers again. I gotta ask. Are sure you have the seat installed in the wastegate? The numbers you are getting look like a 45r turbo. There is no way it can be that laggy. I bet the wastegate does not have the seat installed. This means you have a big boost leak before the turbo. I dont know that many people that have used tial wastegates. And I know three who left the ring out. The boost response is exactly as you have posted.

 

Hmm, that would explain a lot. I bought the kit used and never touched the wastegate assuming it was fine (probably a bad assumption). That certainly could be a problem and I will check it later tonight. Thanks!