engine swap !
 

hey guys !


I posted pics and specs of my car in the show-off forum recently , I'm totally in love with supras. I've started working on the engine and whatnot , aswell as fixing the little things here and there. I've found quite a few things that need to be fixed before I can mod the engine, and so i'm considering the option of buying a new engine and tranny from japan :).

My current engine has 250k on it , I know they last a long time, but a 2.5L 1jzgte engine with 45k sounds much more appealing. The supra is a targa, and an automatic. I'd like to change it to the manual because autos are ridiculous.

I understand that its going to be a lot of work to do the change-over, and its a challenge i'm willing to take-on. Have any of you done this , or something like it before ? Will I have to redo my drivetrain or reinforce it because of the extra power ?

If i have the manual transmission , that was paired with the engine, will I still have to buy parts to convert ? (apart from the clutch pedal and such)

I'm quite excited to begin work on this , every bit of input is appreciated.

no offence, but this topic has been covered numerous times. Please try using the search option before making a whole new thread.

If your search generates new questions that arent covered please feel free to revive one of those threads with your questions

ok, i've got a specific question.

Which engine would be a stronger base for a 400hp car to be put with manual transmission into a 1987 7mgte ?

Shouldn't the 1jz be called 2jz because it has two turbos ?

those two are diffrent engines, they both can have twins , but they are not the same

How many cylinders is the 1Jz? it seems kind of odd to me that they'd have a 6 cyl 2.5l ... hm

All supra motors are inline 6s. The displacement does vary. And if you want the faster engine, go for the 7mgte. The 1jz doesnt have as much torque as the 7m.

Faster in which way , top end or 0-60?

Nothing wrong with a 2.5 straight 6. Ive got two 2.5's connected together at the crankshaft that run independent of each other electronically. Its my wifes BMW 750IL V12. And it hauls ass. Whenever I need a speed fix I leave my Supra at home and drive her car lol.

Both. People think horsepower makes speed. Its the torque that makes a car fast. The 1jz has considerably less torque than a 7m. Which is the reason a 7m will beat a 1jz with the same horsepower.

ok , but wouldn't the 1jz be better for top end because of higher revs?

Put a new +1 mm ferrea valve train in a 7m and you'll be able to rev just as high, if not higher. Then put a lighter flywheel in it and you'll be able to rev faster. It all depends on personal preference. If i did get a 1jz id switch it to a single turbo. 1 big one beats 2 little ones.

Torque doesnt always necesarily make a car faster, But it does feel nice. Its good to have about the same tq/hp. Buttt, you want the torque down low, before the hps kick in. A 1j that did have the same torque via boost, would make it at a higher rpm than a larger motor, which is no fun. For the tq thing....think of how fast a tractor trailer is with and without a trailer. They make like 2500 lb ft of torque, not to sure on them, but its high. And they are hardly any faster with no tralier because they only have about 350 hp. Now stick a motor with even 1000 hp and 2500 lb-ft of torque in there, And...fast ass truck. And it can still tow a tralier.

TQ vs HP
 

Actually it is more like 400 hp and 3000 ft lbs of TQ but what you arent taking into effect is gear ratio. I drive a truck for a living, and they are quicker without a trailer because of the power to weight ratio, where a 1000 hp engine isnt going to do anything more than my 400hp engine because it is all about the TQ in a semi. The gears are set for low end torque, not top end hp or speed. That is the worst analogy I have ever seen on the HP vs TQ. All that 1000Hp would do is allow me to keep my speed on mountain climbs. All TQ is is the ability for a vehicle to propel itself foward, HP is there to make TQ. 1 hp is the ability to move appox. 500+ lbs. To much tq is just as bad as to much HP. it is all about balance. The more torque you have the faster you will accelerate, the more HP you have the higher your speed will be. 3000 ft lbs of tq and 400 hp will give you a top speed of about 110mph, where 1000hp and 1200 ft lbs of tq will put you over 200mph. All about balance. And 10,000 hp and 100 ft lbs of tq get you a high top speed but 2 weeks to get there.

NYTRYDR, before anything else do your reasearch go to wikipedia.org they have good info on supras and their engines learn something about the car then reasearch your goals for the car and choose 7mgte or 1jzgte. research torque and hp too since the post turned into a topic on it. if you dont know the difference between r154, w58, and a340e or what they are youre nowhere near ready for a swap. no offense but it seems like youre kinda lost, 1jz is a 2.5l and a 2jz is a 3.0l on the mk4s both can be single or twins. research toyota engines too, it will tell you what the numbers and letters mean. sorry if i sound like an asshole