Toyota Supra Engine Question
 

I'm new to this forum and not very informed on Toyota Supras I'd like to know what if any horsepower difference there is between the "American" Toyota Supra Twin Turbo(being the ones sold in USA) and the "Import" Toyota Supra Twin Turbo(being the RHD Supra), if I remember correctly the American Supra is rated at 320hp. and are the stats posted on most sights correct for quarter mile time stock for the domestic Supra being around 13.6 seconds? I'm looking into getting a supra in the future and would like to learn more about them and find out how accurate this information is.

http://mkiv.supras.org.nz/specs.htm

I belive the export supras had bigger injectors and steel turbos.

the rhd mk4 has 440cc injectors, ct12b turbos (ceramic) 280bhp
lhd mk4 has 550cc injectors, ct12b turbos (steel) 320bhp

simple enuf ;)

FYI/fwiw, the intake-side cam is different as well.

really the RHD Toyota Supra has less horsepower? I always thought that Imported cars were higher horsepower :S apparently I'm wrong. thanks for the info tho.

btw I'm told that you need to put alot of money into a supra to ACTUALLY be able to run a 13.6second in the quarter mile is this true? or are they just people that think they know something and like to talk out their butt? lmao

A lot of money to run 13.6.?
NO!
Thats like STOCK or slower then stock.

lhd supra should probly do a cat back exhaust & intake and do low 13's quite easily
even the rhd supra doesn't take much to get into 13's either ;)

wait. stock Mkiv tt's are NOT in the 13's?

i thought supras do 13's easily

What do they do?

Everywhere I look it tells me that a TT MKIV dose
low to mid 13's. So I dont know what they are talking about.:)

Wait I am a little confused here. Didnt you say like 2 posts back that they dont do 13's? IMO and I have the links to back me stock mk4 tt's do mid to low 13's and their 0-60times are below 5seconds.

I didnt say that. I asked. suprra_girl said that it dosent take a lot to get them in 13's and thats what made me ask "Wait they dont do 13s?"
read my post up top.
http://web.missouri.edu/~apcb20/times.html

SUPRA's DO MID 13's quote me on that.

Ok thanks for clearing that up for me.

meh... i'll stay out of mk4 arguments LOL

i'm a mk3 girl

k so.. they do 13's k :p

it depends which import mk4 it is. the UK one pushes out 326 and the Japanese is like 300 or something...i forget for sure. the UK also has a hood scoop where the US And Japanese don't. I've also seen a lot of UK ones with ugly headlight cleaners. there are other dif. that i think people have already posted on. oh and the us q miles differ year to year

only in a few 10th's though.

ok I was just wondering cuz they said that the Toyota Supra is a "dyno king" meaning the dyno says it does those times, but they really dont, does anyone have any time slips? I dont doubt that they actually do those times but I just wanna clear it up, it eats away at me inside, lmao, thanks guys.

well i know for the 93(because this has come up a few times) that it can really do 13.4 q mile and 4.9 0-60. this came up in road and track i think. Road and track does real times, they just had a whole thing about how they test their cars a month or two a go

Here's the original Road & Track Test:
http://mkiv.com/publications/road&tr...3/rt393_06.jpg

...fyi there are also more Road & Track articles here:
http://mkiv.com/publications/road&track/index.html

...and articles from other publications here:
http://www.mkiv.com/publications/index.html

oh maybe that 4.9 and 13.4 were from another magazine. when trying to find it, i ran into the car and driver one and it says 4.6 and 13.1... so i guess it depends what day of the week it is. anyways, cool r&t articles

http://www.geocities.com/ma71supratu...93cdsupra.html

and here's a site any supra fan would like because it has articles for all mk's

http://www.geocities.com/ma71supraturbo/articles.html


i like this article too

http://www.geocities.com/ma71supratu...93cdsupra.html

oh, i didn't see all your other links.... we posted like the same thing

As like what supragirrl said, the differences are the turbochargers(ct12s), the injectors(440vs550cc), ecu, and the egr system. Japan rated that car at the time as 280ps because of a "gentlemens agreement" to not start horsepower wars. In actuality, both u.s. and jdm supra tt dyno (dyno dynamics) around 270-280rwhp when in good condition in factory form. So basically in stock form they are slightly "identical". When modifying past 400rwhp on the jdm version, they usually swap in the stock export 550cc injectors and ecu. To be a little more specific, the jdm ct12b's are a .42 a/r turbo housing. The major and minor of the ceramic turbine blades are 60mm and 48mm and the compressor side is 62mm and 39mm. For the U.S. ct12b's they use a .53 a/r turbine housing. The major and minor are 52mm and 44mm for the steel turbine blades and 58mm and 39mm for the compressor side. The U.S. spec supra tt is only capable of around 540rwhp on the factory 550cc injectors, and thats at 80+% duty cycle(pretty much maxxed out). The factory U.S. spec turbochargers are only capable of around 490rwhp(give or take a few) as the turbos are out of its efficiency range past that. (there are no known compressor maps for the ct12b's released. But there are similar sized turbos out there (all old style, very similar)with compressor maps that can be used as a rough guide) The sweet spot(and daily driver reliability) for the tt's imho are around 18-20psi(Ive seen 25psi, but it had cams,nitrous and head work made like 500+rwhp), anymore is just heated charge air(got dyno graphs and air temps at diff. psi levels). I have pictures (couple different cases)of overboosted U.S. ct12b's that came apart due to insanely high shaft speeds that it wasnt meant to reach.(20+psi=max boost). Just my fifty cents.

Unfortunately, (fyi) that point is not accurate. Fwiw, my own personal (US-Spec) Supra (6spd) dyno'd at 305rwhp in 100% bone-stock form, with about 50K on the odo. I've seen others post even higher dyno results from very low mileage, bone-stock US-spec Supras...the highest I recall seeing is about 315rwhp or so.
Agreed. Please see this link:
http://www.moreboost.org/turbo_detai...stock%20turbos

Yeah you are right Ive seen a few 300+rwhp baselines, the cars we dynoed (276.4rwhp,282.7rwhp as well as many others)were on a dyno dynamics and in 4th gear(the 276rwhp had 120k miles, new 15w40 mobile oil, diff. oil, coolant and plugs, the 282rwhp had an old k&n drop in filter,165k miles, new fuel filter). I should of said "the average okay-conditioned un-modified tt should make anywhere near + or - xxxrwhp at 11psi" The "industry standard" uses the dyno jet that read sometimes 15% higher. We do testing on both and have seen inflated numbers. And also elevation, gas, outside/inside temp, fans, and other correction factors play a big part of the numbers game.

Wow I always thought they were quicker than that. Hell my 97 Cobra right now is at a mid 12...Kinda depressing to hear since I'm ditching this mustang soon and looking for a a supra, nsx, or 04 cobra...

Low 13s is bone stock. At bpu++++ (no nos), mid to low 12s is achievable (possibly even high 11s in ideal conditions) with drag radials. Add a single turbo or nos and you're firmly in the 11s with ET Streets. Add a larger single turbo and a fuel system (or a bigger shot of nos and your in the 10s with slicks. Keep us posted if you get a Supra...

Sorry to revive an old thread guys but searching gave me this as a best choice.

Im living in canada and have purchased a supra in Japan, just waiting until may 08 to import it. Im not worried about the car itself but just a general question. as its well known the JDM supra because of japanese laws and the hp limits car manufactureres agreed to they are limited to 280hp from the factory and the North American ones are 320, is there anyway to increase the HP to North American standards without doing BPU or upgrading expensive parts? Basically what I'm asking, is the restriction to 280HP to do with sofware of the ECU or is it hardware related which means I would have to replace the turbo's with steel ones as well as increase injector size along with other mods?

This is a turbo car...just turn up the boost and make as much power as you want. Be sure to run 93 octane at less than 16psi and add 100+ octane race fuel at more than 16psi. When you hit about 425rwhp, you'll be maxing out those injectors.

so in Japan they are just running at lower boost levels?

No............

well I guess I was vague and I apologize. I understand the easiest way to make up the HP difference would be to increase boost that is obvious. But I was just generally inquiring about what caused the difference in hp, if it was just lower boost being used or the internals were causing the difference.
(I know some people may say well duh, different internals will give different results, but thats not always the case, I was just curious)
Thank you for the help pwpanas :)

It seems you pretty much already know the answer, as you posted above: "...the ECU...replace the turbo's...increase injector size..." :dunno:

The only thing you missed is the intake side cam (larger duration in the us-spec). Other than that, the internals are identical.