BPT GTR vs GTX?

[Tron]

Does anyone know the physical differences between the GTR and the GTX engines besides horse power? Thanks.....

[Manach]

Nothing.<p>If you had done a search, you would have known that the Turbo is bigger on the GTR, Injector too. And that's about it.<p>A quick polishe on a GT-X will bring the engine to the same power of a GT-R.. So don't stick in your ming you need a GT-R all the way..<p>Better yet, mod a BPD engine, a NA engine into turbo.. you'll get better compression, already forged pieces (up to 30psi internal!) and the engine will flow better at high RPM!

[992mmx3]

I thought the gtr had forged pistons and crank? Maybe not, of course I don't know too much about the bpt's anyways.

[maldo]

Some misinformation here.<p>All B series motors come with a forged crank, cast pistons. Same rods in both. Bigger turbo on the GTR. The cylinder head has a better valve train, including sodium filled valves. You will have to do a little more than a polish to match performance. Personally, buying a BP block from any of the cars that came with that motor is the best bet, use a NB cylinder head from the Miata and turbo that combo. Much better gains and possibly less cost.

[992mmx3]

<blockquote><font size="1" face="Verdana, Arial">quote:</font><hr>Originally posted by maldo:
Some misinformation here.
<hr></blockquote><p>
My post wasn't really information, more like brain fart/question.
:p

[Manach]

Nah, me, misinformation..<p>Well, BLT, from barelylegal transplants did P&P, and acheive a similar gain compare to the GTR.<p>Well, buying a engine for 2000$, P&P 1000$, better than paying a GTR 4000$..I would do the GT-X

[Marlon]

<blockquote><font size="1" face="Verdana, Arial">quote:</font><hr>Originally posted by Manach:
Nah, me, misinformation..<p>Well, BLT, from barelylegal transplants did P&P, and acheive a similar gain compare to the GTR.<p>Well, buying a engine for 2000$, P&P 1000$, better than paying a GTR 4000$..I would do the GT-X <hr></blockquote>
better yet
bp engine 900 cnd + pp head 1000+ custom turbo kit 1000-6000 = 250 hp to 400hp

[torpedan]

nah if you do the BP the head could prolly benefit from a port and polish but not nearly as much as a gtr/gtx.. but yeah it could be considred a cheaper route especially when you bring shipping into the equation.

[maldo]

I beg to differ. You will have to spend more on a GTX/GTR head to achieve the same goals as the BP head found on the miata or protege. The head from the '99+ miata (known as the NB head) is the best flowing design Mazda has come up with. A light p&p on a GTR engine will only bring you to the NB head standard. The NB head also has solid lifters, stiffer valvesprings and a better design overall.<p>The best design is to use a BP shortblock, add a NB head and build a manifold and sheetmetal intake. Even with the an equal turbo and intake manifold on the GTR and hybrid motor would result in the hybrid coming out on top.

[Gro Harlem]

GTR motor:<p>-5-stage oil cooler (gtx has 2 stage, as do all older BP's)
-Sodium impregnated valves
-tuned intake manifold runners
-agressive hollow camhaft
-IHI VJ23 ball bearing turbo (gtx has ihi vj20 which is non-ball bearing and much smaller)
-larger exhaust manifold ports<p>On top of this stuff (which I am certain of) it might have a balanced crank, and forged rods and some kind of reinforced cylinder sleeves. I have heard it has larger valves, but i haven't confirmed it. <p>Some aussie site has all the differences listed. I'm on my home computer, so all my links on my college comp are on that HD or I'd post them.<p>
I have a GTR in my basement Going to put it in my 93 GS to show it can be done, and done easy

[maldo]

There is no doubt that the GTR has many good points, especially when compared on paper to other BP motor as far as internal/external parts go. The fact remains that the NB head flows much more, more than the stock GTX head (which even a NA BP head flows more). I wouldn't spend my money on it though as I can build a better motor from scatch instead of spending the cash on the motor that is going to be ripped apart and upgraded anyways.

[Shady469]

yeah those pics that you posted of the intake ports were just disturbing...