I am in the process of picking up this turbo kit and I wanted to know from the people who actually own the kit what their impressions are, and what boost controller they are using, hp numbers and boost, etc

 

honestly, I believe that the turbo kit isnt really a bang for the buck(gt42). The gt35/40 is about half the price and has slight diff is hp. I dont mean to ruin somebody's buisness but the kit is over priced. maybe there is something to it than what i read about it. How much is the kit that your talking about buying(2manytickets)???
if you have the money to spend i guess its a ok turbo kit Im not very knowledged about turbos so keep that in mind.
also theres a thread about the gt42 sorry if im hating on the 42

 

I have it. That is if you are buying it in the Great White North The install was just completed in mid-February and I have only driven it 2 hours on the highway to get it home. My computer is not tuned and I don't have a boost controller yet, so I have no test numbers. I tried a brief roll on in 5th and my 7 lb wastegates opened at 2800 RPM.

Pictures of the turbo start on page 3. GT 42 install

 

I get the impression that there are very few people running this kit. TYSON obviously is and then a couple of others in Canada who know Marco. Two that I am aware of, but I don't know if they are on the forum. I've only heard about them through my conversations with Marco at Magnus.

I think your best bet to learn the characteristics is really to read Marco's thread "Gt42 on a street only car", and read TYSON's thread above. With TYSON's permission, I might copy some email correspondance that I had with him.

As for bang for the buck, maybe, maybe not. The 35/40 has been shown to put down large numbers and it has great spool. I have also read a few places that claim it doesn't pull as hard to readline as, for example a T78, due I assume, to the restrictivness of the T3 style manifold. Read my wordy post:

https://www.rx7club.com/forum/showth...hreadid=161657

I haven't had a ton of feedback on that post so any other thoughts and opinions would be welcome.

The info I have says Marco's Gt42 setup will spool on par with a 35/40, and continue to pull as long as you want it to.

MY opinion, the 35/40 may be great, but if you want the best the Gt42 might very well be it for the time being. A twin setup being the other top performance option.

 

I have decided Im getting it, I was just curious about experiences that people who own it have had

 

Good decision. I am looking to do the same. I know I don't want a 35/40. I just haven't fully decided on the twins. Be sure to let us know what you think of it.

 

I hate that im being negative person about this, sorry
but i would like to ask, even though a turbo spools up at 2800-3200, what can you do with it?? So If you downshift what difference does it make if your at 5k rpms, that you started biulding boost at 2800??? I have always wonder about this??
Please dont tell me you dont downshift!!
Im not flaming the gt42, I just want to know whats the big deal about fast spool up???

 

Rotaries are already pretty short in the low RPM range, why not use a turbo that can help bring some of that back instead of make it worse?

Of course you can downshift, but that still doesn't help you much with your 60' time. Doesn't help on a tight autocross course either, where I would rather leave it in one gear to keep both hands on the wheel and have a smooth power delivery.

 

Quick turbo spool gives more power quicker. If you can make 15psi by 3000 RPM, then you have the benefit of that extra power at 3000 RPM and effectively have a larger power band. A turbo with zero spool up time (impossible) will feel more like a V8 with power on demand. Long spool times limit the power band requiring you to stay in the upper RPM range. For drag this would be fine, for anything else street, autox, road racing, you want a more linear power curve. Those huge tubo's that "hit hard" at 5000 RPM without coming on smooth with disrupt the chassis if it is doing anything but running in a straight line.

 

of course you're gonna get quick spool in 5th, that's when you get the most load. you can do that w/ any turbo. the gt42 is a big bitch and is not for everyone. it's designed for people who want around 1000hp. the tradeoff of course is that it'll be laggier than smaller turbos. there's no secret recipe for turbos, if it's big and makes lots of hp, it'll have lag, you need a lot of exhaust energy to spool it. you can have dual bb and all the bells and whistles, it's still gonna have lag. if a lot of hp is what you're after then this is the turbo for you. if you want quicker response and less hp, then a smaller turbo is probably a better choice. you can't have everything in one turbo, you have to make compromises towards a happy medium.

 

That's why I stated it was in 5th, so you can compare apples to apples. A true test for my car has to wait until spring. I have seen the other cars it is on and I think I will be happy with the results.

 

ok, that makes sence Im not bashing anything once again.