Love your avatar man...that is one badass song and awesome video.

 

I am a sexually confused individual, and my original post here not only makes no sense, but I think everyone would be better off if I left the forum and never came back. :wackit:

 

go fuck your self viper.

 

Fucking stroke this ya flaming mother fucking cunt sucker. :wackit:

Is that suppose to be a joke?

 

A stroker kit is mainly going to bump up low end torque. I'd say that the extra .2 liters isn't going to affect spooling by any more than 500 RPM if that. Also, a T-88 probably works best if you have a raised rev limiter, and I don't think you could raise the rev limiter with a stroked motor...

Either way, there are far better ways (and cheaper) to get around turbo lag. Nitrous Oxide is a viable alternative. So is a 2-step.

Altough, I wonder what a stroked Supra SOUNDS like? Must be mean as hell...

My .02

 

go fuck your self viper.

werd.

 

So a strocked engine cant rev high? Does anyone have ay info on this?

Vincent Chan

 

Large displacement engines do not rev as well as small displacement engines, hence the reduced ability to rev higher.

Some 2.0l engines can rev all day to 9,000 rpm, but a 8.0l engine would be luck to get past 6,000 rpm.

 

Large displacement engines do not rev as well as small displacement engines, hence the reduced ability to rev higher.

Some 2.0l engines can rev all day to 9,000 rpm, but a 8.0l engine would be luck to get past 6,000 rpm.

Why is this? Larger mass pistons = higher stress?

 

So whats the reason to buy a stroker kit isnt it better just to save 5k and do engine work to raise the rev? Stroer kits out tere cost a grip for te supr from what you guys are saying its kind of stupid to buy one.

Vincent Chan

 

Toyomoto has a 3.3 stroker kit that I have seen on the dyno. The car was a SC300 with a 2JZGTE swap, 6 speed, and T-88 and HKS 272 cams, and custom intake. At 14 psi and barely any miles on the motor, the car made 540 rwhp with what looked like no lag at all. I was impressed on how quick the dyno run lasted.

 

This is my understaning of it but i'm no expert

A stroker kit will increase the displacement by increasing the stroke (the distance the piston has to travel in the cylinder) of the engine. Generally a motor whit a big stroke cannot rev as high/fast as one with a small stroke due to many factors. The reason a stroked motor cannot rev as fast is because the piston has to move a greater distance up and down in the cylinder. The reason that some stroked motors don’t rev as high is due to the added mass of the rotating assembly due to the bigger crank. You can build a stroker motor to rev high whit light weight crank, rods and pistons; but it will still not rev as fast as one with a smaller stroke due to the greater distance the piston has to travel.

Although the displacement dose help lag a little, the main purpose of a stroker kit for supras, skylines and other forced induction cars is to increase the displacement so the engine can ingest more air at a given rpm. A stroked 3.2L 2JZ will make more power that a 3.0l 2JZ at the same psi with the same turbo. The reason that you need a raised revlimiter is so that the motor can ingest the air the turbo is flowing. If a T88 flows lets say 1300cfm then your engine must be able to ingest that much air, if not then you must increase air density i.e. turn up the boost. But this presents a problem because you can only turn up the boost to a certain point until you get knock on a certain octane rating. Lets say that a stock 2JZ can only ingest 1000cfm at the stock red line. If you increase the rev limiter to say 9000rpms(with supporting valve train mods) the motor can ingest say 1297cfm. This is because cfm=cubic feet per minute, if you rev the engine higher you are taking in more a greater volume (cubic feet)(3.0l x 9000rpms as opposed to 3.0l x 7000rpm) of air over a period of time (per minute). A stroker kit accomplishes the same thing, except that the engine can ingest that much air at a lower rpm due to the increase in displacement (3.2l x 7000rpms as opposed to 3.0l x 7000rpms)........ And in extrem situations you would have (3.2l x 9000rpms) as in the JUN twin t78 supra....

Unfortunately this is far to complex a subject (that I myself do not understand 100%) for me to explain, maybe some more knowledgeable than me can explain it better.

 

Re: This is my understaning of it but i'm no expert

A stroker kit will increase the displacement by increasing the stroke (the distance the piston has to travel in the cylinder) of the engine. Generally a motor whit a big stroke cannot rev as high/fast as one with a small stroke due to many factors. The reason a stroked motor cannot rev as fast is because the piston has to move a greater distance up and down in the cylinder. The reason that some stroked motors don’t rev as high is due to the added mass of the rotating assembly due to the bigger crank. You can build a stroker motor to rev high whit light weight crank, rods and pistons; but it will still not rev as fast as one with a smaller stroke due to the greater distance the piston has to travel.

Although the displacement dose help lag a little, the main purpose of a stroker kit for supras, skylines and other forced induction cars is to increase the displacement so the engine can ingest more air at a given rpm. A stroked 3.2L 2JZ will make more power that a 3.0l 2JZ at the same psi with the same turbo. The reason that you need a raised revlimiter is so that the motor can ingest the air the turbo is flowing. If a T88 flows lets say 1300cfm then your engine must be able to ingest that much air, if not then you must increase air density i.e. turn up the boost. But this presents a problem because you can only turn up the boost to a certain point until you get knock on a certain octane rating. Lets say that a stock 2JZ can only ingest 1000cfm at the stock red line. If you increase the rev limiter to say 9000rpms(with supporting valve train mods) the motor can ingest say 1297cfm. This is because cfm=cubic feet per minute, if you rev the engine higher you are taking in more a greater volume (cubic feet)(3.0l x 9000rpms as opposed to 3.0l x 7000rpm) of air over a period of time (per minute). A stroker kit accomplishes the same thing, except that the engine can ingest that much air at a lower rpm due to the increase in displacement (3.2l x 7000rpms as opposed to 3.0l x 7000rpms)........ And in extrem situations you would have (3.2l x 9000rpms) as in the JUN twin t78 supra....

Unfortunately this is far to complex a subject (that I myself do not understand 100%) for me to explain, maybe some more knowledgeable than me can explain it better.

The 2jzGTE is already a stroked version of the 1jzGTE.

An excellent article comparing long and short stroked motors can be found in Feb issue of SCC "Technobabble".

They build a long and short stroke version of a b16 motor.
They then compare them on an engine dyno.

The short destroked motor revs quicker and makes more peak hp.

But the longer stroked motor makes more torque and more useable hp with a wider power range.

 

A stroker kit is mainly going to bump up low end torque. I'd say that the extra .2 liters isn't going to affect spooling by any more than 500 RPM if that. Also, a T-88 probably works best if you have a raised rev limiter, and I don't think you could raise the rev limiter with a stroked motor...

Either way, there are far better ways (and cheaper) to get around turbo lag. Nitrous Oxide is a viable alternative. So is a 2-step.

Altough, I wonder what a stroked Supra SOUNDS like? Must be mean as hell...

My .02

Dude, 500 rpm when it comes to spool is a big deal! if it were to cut out 5k rpm that would be significant. As for the toyomoto car, recalll in the Lexus's they often use the auto 3.73 rear in the tranny swaps. This shorter gearing would cut lag and sure make a dyno run a short one.

Adam

 

see i understand why the stroked motor would rev slower and i understand it would be harder for it to rev fast because it has more mass to move. but...where do you determine where the engine physically cannot rev past or where it is dangerous due to stress to rev the stroker.

im mainly trying to figure out if it would be better to just forge the 3l internals and raise the redline or do the forged 3.3/3.4l internals. (and possibly raise the redline on that). i do love the idea of more low end torque when youre thinking about a big single with significant lag (ie t88/sp88/t72)

 

see i understand why the stroked motor would rev slower and i understand it would be harder for it to rev fast because it has more mass to move. but...where do you determine where the engine physically cannot rev past or where it is dangerous due to stress to rev the stroker.

im mainly trying to figure out if it would be better to just forge the 3l internals and raise the redline or do the forged 3.3/3.4l internals. (and possibly raise the redline on that). i do love the idea of more low end torque when youre thinking about a big single with significant lag (ie t88/sp88/t72)

Usually the limiting factor of how high an engine can rev is its valvetrain. If the valvetrain could safely rev to...say... 9000rpms and have no problems, then you could rev to that redline safely.

Another important factor (probubly the biggest factor also) in how high reving of a motor you can have is also the stroke to rod length ratio. An engine with a small stroke and a long rod length will be able to rev higher than an engine with bigger stroke and shorter rod length. This would have the greatest effect on the engine's rev characteristics, but unfortunately, you cannot change the stroke to rod length ratio too much in an existing engine. This would only come into acount if you were designing an engine from scracth.

As for what would be better: a 3.0l or a 3.2l, I would say that the 3.2l with a raised rev limiter would be best because this will not only give you a broader power band, but also more area under the curve.

Forgive me if any of this is wrong. I'm only 16yr old.

-TT

 

There are better ways to spend 9K dollars.

Eric

 

Usually the limiting factor of how high an engine can rev is its valvetrain. If the valvetrain could safely rev to...say... 9000rpms and have no problems, then you could rev to that redline safely.

-TT

You hit the nail on the head. Valvetrain is one of the main determining factors on how high an engine can rev. True indeed there are many variables that come into play when dealing with the rotating assembly, mainly the rods, bearings and tensile loads but stroking the 2JZ to only 3.2 litres shouldn't affect how high it'll rev. The only goal you'll accomplish by stroking a motor is an increase in torque (greater lever arm generates more torque to the shaft). The increase in cylinder filling, thus the increase in HP, comes from the piston being at a lower BDC (bottom dead center) point than stock.

 

As for what would be better: a 3.0l or a 3.2l, I would say that the 3.2l with a raised rev limiter would be best because this will not only give you a broader power band, but also more area under the curve.

Forgive me if any of this is wrong. I'm only 16yr old.

-TT

When declaring what would be better you have to be application specific. Stroked would definetly be better for a road racing car but a non stroked engine that can go up to 10k with a massive turbo that would be spooled with nos is also the best engine for its application.

 

How about increasing the piston stoke AND boring the engine out? Surely this way, you could still rev at 8k+ safely?

 

3.2L and 3.4L from a 3.0L will barely make any difference in spool-up rpm alone. However, if you combine trials in cam phasing, timing, ceramic coating (engine and manifold path to turbos to retain as much enthalpy for expansion across the turbine) with the minor increase in stroke, you can probably build a sweet street package on a modest single turbo making 500-600 flywheel hp with comparable spool-up characteristics to the stock turbos in parallel mode.

The increase in piston speeds from the stroke increase will have the same effect in drawing charge as revving it higher. Make sure to observe proper rod-stroke angles for minimum impact on cylinder wall wear. In the end you get more power from less boost.

For mega-turbo applications (something like 800+hp), there's no escaping massive amounts of lag. The only remedy to retain the powerband is to raise the rev cut. This still doesn't fix the around town driving frustration.

I think HKS employs a larger displacement V8 on their mega-fast Supra race cars (1UZ?). I hope Toyota comes out with a 4.3L V8 Supra soon. While it still won't have the remarkable bragging rights of an LPE 427 7.0LTT (803rwhp on 14psi and pump 93 for 1/4 mi duration, full boost well below 4000rpm, through high flow catalytic convertors), I definately see the possibility of a streetable 800 flywheel hp setup and emissions-friendly status.

 

Hey sorry about my other post, lol I was just fucking with you guys.

Have you thought of destrokeing your motor? Sounds crazy but in some cases in can give you more power. Just a thought.

 

Stroked motor.

Hey i got a Toyomoto stroked motor right now. 3.3 liter. Ive driven over 15 diff supras with autos and 6 speed with all different size turbos. The stoker motor gives you the best of both worlds. No lag with mid and high end power. No need for small turbos to spool up fast and no more large turbos with nasty lag. Sam

 

Re: Stroked motor.

Originally posted by Insane4supras Hey i got a Toyomoto stroked motor right now. 3.3 liter. Ive driven over 15 diff supras with autos and 6 speed with all different size turbos. The stoker motor gives you the best of both worlds. No lag with mid and high end power. No need for small turbos to spool up fast and no more large turbos with nasty lag. Sam

So what size turbo do you run on it?

Adam

 

I have a HKS T51R that i had modified to a T72 wheel and a larger housing. Hey adam i e-mailed you on those parts. Hks intercooler type R and stopper type head gasket. Sam