What are the differences between these two turbo's. Does the 35/40 make full boost by 2800 or does it start making boost?? I had to take off some dp for stock twins yesterday and realized that my next car fd will have a single. Right now I am deciding on witch turbo to get.. I not really concerned with lag either..
Whats the 35/40 like above the 18-19 psi????

 

Haven't seen any 35/40 dyno's > 15psi yet. I'll have some numbers here in a month or so...

K

 

The 35/40 is 35 hot side with 40 comp. it is rated at 700hp the staight 40 is rated at 750 hp+ it comes in three a/r .94 1.19 and I don't remember the other one.

 

so wh y dont people use the gt40??? What would is cost to make a gt40 kit???

 

does the GT40 use the T04 manifold or use a T3 manifold like the GT35?

 

So does anyone know anything about the gt40

 

is the GT35/40 a reliable turbo? anyone have any problems with it?

 

I have been looking at a full GT40 for a long time. According to Magnus, and Precision the components to make a full gt40 are not currently available. I beleive that has changed recently, as ford is using a full gt40 in a production car in Europe, in addition AJC13B says he is running one, but has not gotten back to me on the particulars of his turbo. I beleive a non BB GT40 is used in Europe on some Volvo trucks as well. This is the turbo that several Swedes(including a 10 second 540hp BMW 318) are using(costs roughly 1000.00 non BB). To me the appeal of the GT40 is that it can be configured to a size slightly larger than a T66, and have the advantage of full BB, and the faster spooling GTQ Garrett wheel. It would probably be an excellent choice if it becomes available. In the mean time Precisions PT67 seems a good choice.
AJC, what are you running exactly? Carl Byck

 

Ok they do make a gt 40 bb.And it is bigger than a t66 and than what is the gt35/40 bigger than the t66 also

 

I'm not sure If the GT3540 uses the 50, or the 54 trim GT40 compressor. The 54 trim is about the same size as the T66, 50 trim a little smaller. On the hot side a GT35 is around the same size as a P trim T66. A full GT40 using the larger of the available wheels, would be somewhat larger on the compressor side(than a T66), and similar(almost exactly the same) on the hot side to a Q trim T66. To me the appeal of a GT40, would be Dual Ballbearing, and all Garretts latest inovations for around 800.00 less than an ITS T66BB. The problem remains, IS A FULL GT40 BB AVAILABLE ANYWHERE? Carl Byck

 

www.turbobygarrett.com

 

AJC13B, thanks for posting that site. I was trying to find it the other day and coulnd't.

I was studying the compressor maps of each turbo. The 42 maintains it's efficiency up to very high flow rates. The 40 seems to have a slightly wider efficiency range at the lower boost levels.

This raises the question, what exactly is the flow rate of a rotary. I was told for a street ported engine to figure about 1lb/min flow per HP... Does this seem right? Anyone have a figure for a bridgeport?

Can anyone speak to the corrected gas turbine flow numbers? I noticed the Gt42 has quite a bit higher turbine flow than the 40. I haven't studied hard enough to see the effects of this.

 

AJC, can you pm me with info on where to buy a GT40BB. Thanks, Carl

 

Garrett, part numbers are on the pdf file linked from the turbobydesign page I posted above

 

Magnus, makes a GT40 hybrid. It is not a GT40 as a straight up GT40 would be extramly hard to spool. If you have questions pm him.

 

http://cgi.ebay.com/ebaymotors/ws/eB...category=33742

check this out for a gt 40.

 

AJC, how do you read the 'turbine' maps next to the compressor maps on the garret catalog?

Also, what how would you figure lb/min of airflow on a large street ported REW eninge compares to rwhp numbers? Obviously there are many variables involved, I was just wondering what to use for a ballpark number...

thanks alot,
kyle

 

I don't get it, Magnus, Precision, RPM etc say they cannot get a GT40, yet this guy has six. Something is very strange here. I will be contacting these guys promptly. I beleive a properly speced GT40 will be a perfect comprimise between the Magnus GT42, and the undersized GT3540. Properly set up this turbo should be good for 500-600rwhp, with all the benefits of Garretts BB turbos. Let's try to get a phone number on this guy, and get the skinny. If anyone else gets his number, drop me a pm and I will talk to him. I've been researching this for awhile, and I think I will be able to sort out if this is what wehave been looking for. Carl Byck

 

I totally agree Carl. I emailed the guy and asked several questions. one of which being the fact that the picture shows and undivided houseing. I am really hoping for a divided V-band, simliar to what comes on the Magnus Gt42. I could live without the v band, but divided I think will be key to getting the good response.

Anyway, keep me posted on this. I'm ready to buy now if this is what we think it is. I guess the next question will be what trim to get it in. I think the 54 trim compressor but I'm not totally convinced on the turbine. I'd guess the 84 with a 1.19 AR? Or maybe the 73 with a .94...

 

I'm not an Ebay user(believe it or no...) can you get a phone number on this guy? I did a bunch of research, which I am looking for, which answers which one I think is best. Basicly there are options which would allow you to configure a GT40 to be slightly larger than a T66. Basicly if this is what it claims, you've got a T66BB for around 1200.00 . We need to find out if it's water cooled. I searched RZM racing, and foun that they do custom race parts for of all things Suzuki swifts Unless you build an equal length manifold I'm not sure how important the divided housing is. If you email him again check water cooled, to4 flange, dual bb chra, and what he will sell them for outright, no bidding. Call me if you want, also see if he wants to deal on two, and we can buy them together. Carl 707-696-2705

 

Check this site out for some insight on what trim you want http://www.moreboost.org/turbos.htm I will have to go to the Garrett site, and check all the wheel and trim info. I think anything in the TO4R-T66 range will give us that 500rwhp easily without waiting too long for it... Carl

 

I e-mailed them on e-bay and asked them to respond here. They have a good reputation on e-bay as far as satisfied customers.

 

No phone number so I emailed him again. i'll get back with you as soon as I hear from him.

-Chris

 

Hi Everybody:

We are posting this info message to help you get some inside info on the new GT series from Garret. Shout goes to Chriss who emailed me and asked to post some info on this forum.

The GT series is the newest technological development directly from Garret. For many years companies like Turbonetics, Innovative Turbo etc...have been modifying and selling Garret Based Turbochargers. Everything that has been available up to date is based on the old, but still reliable, turbo architecture designed many years ago. Garret has been watching the high performance market for a while now and wants a big chunk of it. And why not? After all is their turbos on what all the racing scene is based on......

The GT40 turbo is a big and bad unit. Properly configured it supplies enough airflow to produce close to 700HP in a single turbo application. It features a "TRUE BALL BEARING" cartridge. This cartridge has been engineered by Garret newest high performance division. Before Garrets ball bearing introduction, you could get a "ceramic ball bearing cartridge" sold as an option on Turbonetics "T" series. This ceramic cartridges have been proven very unreliable, giving all kind of headaches, once it's broken, wich happens very commonly, you can't fix it. It's a "throw it away and buy a new one", kind of deal.....

I'm attaching some pictures of the different compresor and turbine maps options as well as some dimmension pictures. The GT40 is similar in size as the Turbonetics "T" series but with a turbo lag almost non existent. For you rotary guys, this turbos is a lethal weapon, back housing trims are pretty big, something that's it's very desirable for rotary heads.

Enjoy the pictures, hope the info help. I can be reached at (305) 332-6396

Best Regards,

Nestor Martin
RZM RACING TECHNOLOGIES

 

Good info Nestor but the pics didn't make it here or in the e-mail you sent me. Do you have a web site we can go to?
BTW:You also may want to click on the RX-7 store banner and contact Jason about working out a turbo package with him.
Thanks, Chris