Could I get some feed back from some gt35/40 owners.

I hear that the top end on these dies off pretty fast.

What are your driving impressions of this turbo.

Please dont bother posting graphs, or chart comparisons, It would go right over my head and I still wouldnt know what to expect from one.

I'm bored with my set up and want something faster. I dont need big horsepower. Somewhere just over 400 would be all I really want. I'm not huge on the track so I just don't have a need for BIG HP.But all the local stuff that Iam competing with has gobs of low end and I need something that will get me to 120 mph before everyone else.

I ran into a Supercharged 5.notsoslow, and I got pulled on due to a torn coupler, but I dont want to let that stuff happen again, even if a torn coupler was to blame this time.



Thanks for any input.

Felt like a dumbass, I just saw the other topic on the sam matter. Anyway my question still stands since that thread got off the gt35/40 topic.

Where are this turbos limitations?

What horsepower should be expeted for say 17psi on pump gas?

Is the 35/40 the answer to my prayers?

I don't think you can make past 480rwhp on the gt35/40.

@ 17psi you could make 450rwhp if you had the right porting/tuning ect.

Dave,



Play around with Wargasm's dyno page some. There's only 3 35/40 dynos on there.



Here's one showing:



- Dick Lamberts stock turbos (probably perfectly maintained and tuned) don't know if it's ported or not.

- Ihor's 35/40 @ 15 psi and 20 psi. Heavily street-ported engine, we've all seen video of it running, I think.

- Toy's 35/40 @ 16 psi. don't know if it's ported.

- RP T78 car. don't know if it's ported either.



Up to about 3800 RPM the stock twins are putting out more power. Stock and 35/40 clearly spank this T78.



However, with a bigger turbo I've seen power to match the 35/40 with almost no porting, (ie. sounds exactly like stock).



Serious porting can make a BIG turbo spool quickly, but you also need a well designed manifold to help.



GT35R VS stock twins VS T78



Hey, and keep in mind you're racing a 2.6L motor DESIGNED for high RPM against 5L and up motors designed for low RPM. You can't make the motor do what it's not designed to do no matter what you strap to it, unless you want to use nitrous. https://www.nopistons.com/forums/pub...#>/BURNOUT.gif

I agree that there is now way I can keep from getting whooped up till say 3800-4000. But after that I need one serious good kick in the pants. Hopefully the 35/40 would come to full spool at say 3800-4000 with the right manifold/and my ports. My twins come on line at about 3900(non-seq). I have Demetrious to bug about tunning. https://www.nopistons.com/forums/pub...IR#>/smile.png

I imagine he could get me where I want to be as long as this turbo is willing.

Thanks for the link to Brians page.

I still would like to know where does the 35/40 fall off and where is it's effincey range?



Thanks for chimming in. https://www.nopistons.com/forums/pub...IR#>/blush.png

If you've already ported, then go bigger than the 35R.



GT40R or buy my GT42!

Wow, in that dyno comparison the 35/40 looks like the ****!

The t-78 really has a sketchy power band, laggy then spoolin but still not nice and smooth.

The 35/40 seems to be really smooth.

I like. https://www.nopistons.com/forums/pub...#>/biggrin.png



Red line is a t-78

Purple line is twins

Blue is a 35r on 16 psi

Green lines are both 35R, Light green is at 20 psi , and dark green is at 15 psi.







http://www.catenet.net/tmp/1042.png

Whats the 35r?

Yes I am ported. Its an Aggro street port! https://www.nopistons.com/forums/pub...1047683785.gif

Would these others spool in the same time frame?

Sorry but honestly I am turbo stupid so please bear with me.

35R is the 35/40. Whoever these guys started buying them from for RX-7's called it the 35/40 for some reason. Garrett calls it the 35R.



My 42 spools well. On stock ports on my car I could hit 3 psi in neutral by going WOT to redline. From 2000 RPM in 5th the wastegates (7lb spring) opened @ 2700 RPM. Please try that with your car if you're driving it now and let me know how it compares, I haven't seen the stock turbos tested to compare.



Maybe Badog could comment on the GT40R, I don't know if it's running yet?

So you want me to do what now?

What about Michel? Did he ever get is Gt-40?

Oh and thanks for the tip on the turbo name. 35R its is from now on.

Check out these 2.



carx7 VS silver93tt



I don't know Chris' porting specs off the top of my head, but I DO know he put a lot of thought into his turbo and manifold design. Look at his low RPM advantage. Looks like about 25 hp all the way up to nearly 4000RPM.

hey dave, wanna take a ride in my t-78....tuned and put in by dee https://www.nopistons.com/forums/pub...#>/biggrin.png just holla. i also wanted the gt35/40 but he convinced me to go with the greddy. just holla. stock port though.

https://www.nopistons.com/forums/pub...#>/biggrin.png Put it in neutral and stomp on the gas! https://www.nopistons.com/forums/pub...#>/biggrin.png See what your boost peaks at. It's no definitive test, but it can give you an idea.



I thought I saw Michel mention he got a non-ballbearing GT40 in the end. https://www.nopistons.com/forums/pub...1047683561.gif

Most defintely, This Kevin?

I had a similar conversation and he told me he felt confident that he could bringa t78 to full spool under 4000 rpm.

My thinking was if that is true he could get a 35r spooled up super fast.



Either way I would love a ride, but only on a straight away. I aint stupid https://www.nopistons.com/forums/pub...IR#>/smile.png

The RP T78 turbo kit is actually done in my car and with a high flow cat. that explains the laggy spool up time. I believed that the dyno chart was taken off from one of the magazine to show that a high flow cat can generate 400rwhp+

If you only want around 400 get a T04s like Brianhas or a T04e. Its way cheaper then a 35r and will make decent power. It wont cost a **** ton to rebuild. If you want something cool then get the 35r but its gonna cost more in the long run, and only make a little more power.

I have the gt35r or 35/40 whichever you want to call it. Personally for street driving I love it. I had my large street ported motor tuned to 1 bar earlier in the fall and I have full boost at about 3500 rpm or so. I plan to tune to approximately 17 on pump gas this spring with new wheels/tires, as this was what would not allow me to safely tune past 1 bar. I was told that this turbo really doesn't become efficient until approximately 17 psi. I suppose if your port were aggresive enough it could spool the T-78 a bit earlier than normal but for my money if the 35r weren't enough I would probably go with the 40r as it should produce about the same amount of power as the T-78 give or take some but spool quicker as it is BB. Honestly call Sean at A-Spec and talk to him about the setups you are considering he'll be able to help set you straight.

-Nic

I am the only one that can't see those dyno comparisons https://www.nopistons.com/forums/pub...O_DIR#>/11.gif ...

Take those dyno graphs on that site with a grain of salt. Who knows how those cars were tuned or tuned at all. That is probably the worst looking T-78 graph I have seen. If you want to see a good one look here http://www.rx-7store.net/rx7pics/zaviersdynograph.jpg

If you superimpose that over the others the T-78 is making more power throught the entire power band.

finally some answers to the 3540 confusion! 450+ at 17-18psi sounds very nice. what kind of boost can it go up to and at what point would it be a good idea to use 98 octane?



i'd like a ride in a t78 sometime!



fd3boost when you do get one and get tuned by demetrios tell me how it goes because im looking to get one when i have money and im tired of nonseq.

Come to Columbus, Ohio and you can ride in a T78 followed by a GT35R. I'd tell you which one would win from a dig or a pull but I don't want to go there right now https://www.nopistons.com/forums/pub...IR#>/smile.png

https://www.nopistons.com/forums/pub...IR#>/bigok.gif The one you want to compare didn't even step on the gas until after 3500RPM.



Since silver93tt WORKS with Steve Kan, who replied earlier as to why that T78 might look so bad, perhaps they may have done some tuning https://www.nopistons.com/forums/pub...IR#>/wacko.png







Tony, aren't you supposed to have a GT40R by now? https://www.nopistons.com/forums/pub...1047683561.gif

We want to hear Tony. Tell us whats up

Really I am not concerned with making "more power" Justin.

450 would be all I can stand. Unless you rope the boost in your just gonna slide all over the place anyway. Mine gets a bit silly and I'm using twins. Not to mention I dont see any other Fds in my neck of the woods anyway let alone a T-78 one. I wouldn't mind getting pulled on some by a Fd running a T78. Its not like at 400 plus HP anyone should be ashamed of their ride. https://www.nopistons.com/forums/pub...IR#>/smile.png I doubt I would see more than maybe 3-4 cars that would ever best me with that set up in my end of DC on the streets. In my county I would say maybe 2-3 guys could do that. What I want is to get to the top end of 4th gear before anyone else. Best thing I have seen so far for that is the 35r. Yea the rebuild cartridge is about a grand but they last longer from what I read so you shouldn't need to rebuild as often. I'm not sold anywher yet but I wouldnt mind being the only guy round Maryland rollin on a 35r.

I am just not feeling the to4.

Video!! https://www.nopistons.com/forums/pub...IR#>/bigok.gif

Whats the circumstances around that?

You talking 1/4 mile?

Roll on, from what speed and backing off at what speed etc etc..

I am not against T-78 at all if that is the way to go then that is the way to go. I just want to be sure that I am not trying to spool up a T-78 while Johnny Mullet and his supercharged 'Stang aren't walking away while I am waiting for boost to build.

Whats the BB T78 equivalent, the G40r?

Full boost by 3500?

Now that is what I am talking about. https://www.nopistons.com/forums/pub...IR#>/smile.png

Mind you that was tuned for 1 bar, but yeah my full boost is right around 3500 or shortly after. I haven't driven the car in a couple of months so I'm not totally sure on the exact rpm level. Like I said though I'm incredibly happy with it especially since my car sees a lot of street driving and some Auto-X. If you're looking for 400 or a bit above that with the possibility to push towards 450 with an aggresive port so on and so forth the 35r might be your weapon of choice.

-Nic

what gear are you doing this full boost of 15lbs at 3500rpm?

hey boost and blueskaterboy....hit me up anytime while my car is still running for a ride. i would get it dynoed but don't know much places on the weekend. i am about to do a brake upgrade so it might be down soon.............it's starting to screech on the left rears already. maybe you guys can help me dx by turn signal woes i have had for two years now https://www.nopistons.com/forums/pub...#>/biggrin.png i live in ellicott city, i am fd3virgin on the otherboard. https://www.nopistons.com/forums/pub...R#>/unsure.png kvn

That turbo isnt good at boost levels much higher then that. You can thank the T3 footprint....

3rd gear it's a bit higher in 4th given load and all but for all practical reasons that's where I saw that boost level. Regardless it's up and going very soon.

i have watched a local gt35r/35 40 3rd gen dyno at basically a bar and he had full boost onthe dyno right before 3500 and it held rock solid boost till he let off.

i only asked which gear cuz you can typically spool turbos faster at higher gears..... and i always get confused by people saying it boost to certain boost levels at certain rpms.....



like my twins, i could spool it up to full boost at 2300rpm, but that would be in 5th gear... lol

It's cool. Like I said that's what I remember it's been a few months since I've been able to get it out.

Well the most I plan to run this turbo to would probably be 19 psi or so on race gas and I was told this turbo really doesn't become efficient on our motors until about 17psi. But that just may be a difference in opinions. I don't know really but I've heard both sides of that argument before.

-Nic

I ran the 35/40 for over a year and got tired of it. Yea I put down 430 @ 16 psi and 470 @ 20psi but the timing was too advanced in my opinion. At the time the ports I had which were supposed to be huge, were garbage. After properly porting the motor and getting tuned by Steve, I never had a chance to dyno again. Something is messed up with the turbo. Steve thinks its the compressor map or something. It would make 15psi by 3500 rpm, but wouldn't pull hard till 6000. By 7500 power was falling off. Its good for the street, but I am looking for something more. All it took is a ride in a properly set up 60-1 car to convice me to sell the garrett.

This was essentially the feedback I got before buying my 42. This was from someone who installed both turbos back to back on nearly identical cars. Something just didn't fell quite "right" https://www.nopistons.com/forums/pub...1047683561.gif

how's your new setup coming along?



can you start a thread with the details.... or message me? cuz im in the market for a single

aim fikserxseven

I'm now interested to see if the same is said about the 40r once a few more people have bought them and gotten them tuned properly. I guess we'll just have to wait and see.

This is why I was reccomending the T04e or s Dave.