New '98 Supra

[Mmeyer183]

So I have found a bone stock manual 1998 twin turbo supra that I am going to buy, as it has been the one car I have wanted for the longest. Now I am perfectly happy with how it is and how it drives since it will be a daily driver, but I have been considering doing some modifications to it. Im sure there is a thread on hear somewhere, I just havent had the time to sift through all of them yet. But basically what Im looking for is around 600 rwhp.

I have a neighbor who is pretty good with cars and I have been talking to him about it. Basically to reiterate what he said, "you can easily get 50-100 extra hp off a stock with simple modifications. Anything past that, you need to start upgrading internals. You will need tochange out the rear axel, different intack plenums, throttle body, new injectors, fuel rails, fuel pressure regulators, different clutch, flywheels, driveshaft, pistons and rods, spark plugs, etc..." his list went on, but he says with these mods you can easily handle 800 hp if not more.

Again Im just looking to reach 600 rwhp, but if I decide to go for more later on I would like to have the option to do so. I just need someone to point me in the right direction.

[warmkop]

I,it sounds like your neighbor does not know a lot about the TT supra.
You don't need to upgrade internals or suspension for 600rwhp.
But with that power you will need single turbo conversion and complete fuel system upgrade and a few other upgrades.
AND you will have to run high octane fuel

[Mmeyer183]

Originally Posted by warmkop

You don't need to upgrade internals or suspension for 600rwhp.

Maybe in the future if I was to go bigger, but Im just going to be using this as a daily driver. I would just like to get around 600 rwhp.

Originally Posted by warmkop

But with that power you will need single turbo conversion and complete fuel system upgrade and a few other upgrades.

I knew I was going to need at least fuel system upgrade. I was just unsure of what else would be needed. And why a single turbo conversion and how complicated is it?

Originally Posted by warmkop

AND you will have to run high octane fuel

Does it have to be race fuel, or can it be 93 octane from a pump?

[Sonyps307]

There's supras running 1000+hp on stock internals on pump gas all day

[warmkop]

Originally Posted by Sonyps307

There's supras running 1000+hp on stock internals on pump gas all day

Don't believe that. you can't boost that much with pump fuel it will destroy the engine

[Sonyps307]

With a fuel system upgrade and bigger turbo he can make more then 600hp on pump gas it's been done plenty of times.

[pwpanas]

Originally Posted by warmkop

Don't believe that. you can't boost that much with pump fuel it will destroy the engine

Agreed 100%

Mmeyer183, ask Sonyps307 if he'll pay for your engine if you try that setup and it doesn't work out for the best. My guess is Sonyps307 runs for the hills...because he 1) has no idea what he's talking about, and therefore 2) won't stand behind his advice.

[pwpanas]

Originally Posted by Sonyps307

There's supras running 1000+hp on stock internals on pump gas all day

Prove it. Name even ONE Mkiv Supra Turbo that has this setup right now, and I'll personal get in touch with him/her to verify. If you won't or can't then please STFU because this is VERY BAD advice. Will you buy Mmeyer183 his new engine when he trys this and his #6 cylinder starts blowing large, dense clouds of bluish white smoke out his tailpipe?

Where are you getting this *bad* information? Please let me know so that I can set him/her straight too. Let me set you straight: There is no 3L 2jz-gte Supra on earth pushing 1000hp with only 93 (R+M)/2 octane fuel. Period.

Without water/meth injection, 1000hp on pump gas using a 3L 2jz-gte is completely impracticable. With an unlimited budget and no care for power:weight ratio, sure it's theoretically possible...for example, you could try rig up a system that cools the charge-air with liquid nitrogen. If you got the intake air cold enough (I'd guess the air would need to be maintained at about -150 degrees F during full boost), you *might* avoid detonation with 1000hp and pump gas using a 3L 2jz-GTE. Oh, don't forget that at -150 degrees F, the air (and therefore intake O2) would be MUCH more dense, so the air-fuel mix would need to be tuned appropriately to compensate.

Mmeyer183, if you're not on an unlimited budget, and/or you don't want to waste months experimenting and replacing expensive engine parts, make it easy on yourself and simply ignore Sonyps307's post.

[warmkop]

knew I was going to need at least fuel system upgrade. I was just unsure of what else would be needed. And why a single turbo conversion and how complicated is it?

1.The stock twins wont be able to make that power you will have to upgrade the turbo.
2. It is not that complicated but it is expensive and you will need at least a piggy back system. complete fuel system upgrade and few other stuff

Does it have to be race fuel, or can it be 93 octane from a pump?

To make that power you will have set the boost up much more and you will have to use much better fuel then 93

[pwpanas]

Originally Posted by Mmeyer183

…Im looking for … around 600 rwhp...I have a neighbor who is pretty good with cars and I have been talking to him about it. Basically to reiterate what he said, "you can easily get 50-100 extra hp off a stock with simple modifications. Anything past that, you need to start upgrading internals.

I agree with warmkop – you’re neighbor is completely full of it. Obviously he knows nothing about the 2jz-gte – the oem 2jz-gte internals are very reliable up to 1000hp (of course, using race fuel and high boost from a large single turbo and large fuel injectors).
However, your neighbor was correct that you can get about 100 extra hp off stock with simple modifications. Would you consider this as a starting point?

Originally Posted by Mmeyer183

…You will need tochange out the rear axel…

Wrong. By saying this your neighbor proves he not only is ignorant about the 2jz-gte, he’s ignorant about the Mkiv Supra Turbo as a whole. The oem rear axles are good to over 1200rwhp. Yes. That is not a typo. 1200rwhp. Really. Let me know if you’d like me to help …um… educate your neighbor about the legendary Toyota Supra Turbo. J

Originally Posted by Mmeyer183

…different intack plenums…

For 600rwhp (6spd), your neighbor is also NOT correct about this. The oem intake plenum is good to about 750rwhp (translation 882hp at the crank. Again – Really and 100% for sure.).

Originally Posted by Mmeyer183

…throttle body…

For 600rwhp (6spd), your neighbor is also NOT correct about this. The oem throttle body is also good to about 750rwhp.

Originally Posted by Mmeyer183

…new injectors, fuel rails, fuel pressure regulators…

For 600rwhp (6spd), your neighbor actually IS partially correct about this. The oem fuel system is only good to about 525rwhp. However, the 2jz-gte only has ONE fuel rail, and ONE fuel pressure regulator. J Also, these are not the only components that need to be replaced for 600rwhp. For 600rwhp you would need (As warmkop mentioned) either a complete aftermarket fuel system (which includes these items and many other items that are required) –OR- a large methanol injection system that will not only supply charge-air cooling, it will also supply about 75rwhp of additional fuel.

Originally Posted by Mmeyer183

…different clutch…

Agreed. (Finally!) Score one for the neighbor. The oem 2jz-gte clutch is only long-term-reliable up to about 400rwhp. What’s that - 10 completely wrong, and only 1 right so far?

Originally Posted by Mmeyer183

…flywheels…

Wrong. The oem flywheel is fine up to 750rwhp or so, together with an appropriate clutch.

Originally Posted by Mmeyer183

…driveshaft…

Wrong. The oem driveshaft is fine up to 1000hp, as long as you don’t try to drag race it with R-spec roadrace tires. ...and even then, the real problem is the subframe bushings and not the driveshaft.

Originally Posted by Mmeyer183

…pistons and rods…

Again, he’s completely full of crap here…however, he’s not nearly as far off base as the Sonyps307 dude.

Originally Posted by Mmeyer183

…spark plugs, etc..." his list went on, but he says with these mods you can easily handle 800 hp if not more...

WELL he’s partly correct because there actually is a set of mods that can get you to 800hp and much more if you want…HOWEVER that list of mods is definitely NOT the list he gave you. Instead, start with warmkop's list, and let us know if you have any questions.

Oh, last but not least you said:

Now I am perfectly happy with how it is and how it drives since it will be a daily driver

...please note that in general, the more you modify it the less reliable and the less comfortable it will become. Modifications are essentially a partial reengineering an entire (currently-working-well) mechanical system. Well-paid and well-qualified automotive engineers from Toyota designed everything in the Mkiv Supra Turbo to work together as-is. If you mess with one thing it can affect dozens of other parts of the system. Small modifications will likely only have a small overall impact. More extensive modifications definitely will have a more extensive overall impact. Put another way, you can get a "1001 hp" Bugatti Veyron from the factory, where the entire car is already properly engineered to manage that 1001hp...but it's a $1M+ car. Although some of that price goes towards profit, most of it actually goes towards covering engineering costs and materials. As you begin to modify your Toyota Supra Turbo, please keep all of this in mind.