Toyspeed.org.nz Message Board

by **Ako** » Sat Nov 19, 2005 11:17 am

Hi.. Got a curly question.

Just wondering if anyone really knows just HOW strong the MR2 (the 1990-1994ish ones) engines really are?

As in.. Are they similar in power handling to the 4G63 in stock form - 400hp is sort of thrown around as being able to be coped with by the mitsi engine, is the toyota one just as strong?

Reason I'm asking is I'm looking at an MR2 which has the potential to make some big numbers, (turbos' approx. the size of my head), but it has a poked engine, and I'm weighing up buying the forged bottom end for sale on here, vs just getting a replacement core engine complete and not pushing it too hard. I can imagine even 350 - 380hp in a little MR2 will be a hell of a ride regardless.

I'm sure the resident gurus on here will be able to point me in the right direction...

OMG so shiny! · by **Dell'Orto** » Sat Nov 19, 2005 2:34 pm

Quite strong, have a look at http://www.mr2oc.com to see what they've managed over there. 400hp is definately doable.

by **Malcolm** » Sat Nov 19, 2005 3:34 pm

yeah, there's no easy answer to the question of how much power they can make
there's one guy on mr2oc who's mr2 managed a 11.1 on the stock bottom end with something like 260,000 miles on it. other people have the blocks cracking between number 2 & 3 cylinders.
It's certainly not going to happen without some cams and a good ecu and such, but 400hp is attainable if you are sensible about how you do it, and look at the experiences of others making the same power

Website · by Al » Sat Nov 19, 2005 4:32 pm

You will have to get Paul to give you a staff discount on a motec Ako

Yeah the Hyde mr2 is insane. 11.1 @ 123mph stock bottom end, stock headgasket, stock head excl. cams. 440rwhp. Has run up to 27psi on its GT35R. It has trapped up to 125mph as well.

I can tell you now driving home from the drags on race boost on the street is quite an experience and my car isnt even very powerful

by **Ako** » Sat Nov 19, 2005 4:55 pm

Looks like I might be going for this particular car, if the heads not toasted as well.

ECU - sorted, I work at a performance car parts place and theres a powe FC to suit on the shelf in front of me

Anyone want to buy a T78 :lol:

by **Malcolm** » Sat Nov 19, 2005 9:39 pm

I'm pretty sure Hyde went to a MHG because around 400whp the stockers just started popping constantly...?

Website · by Al » Sat Nov 19, 2005 10:12 pm

Nope its on the original h/g. Looks like next season hes going to a built 2.2 motor.

by **Malcolm** » Sat Nov 19, 2005 11:08 pm

JekylandHyde wrote:I would okay up to about 350-375 rwhp ... I raced for quite a while around there.
As soon as we started approaching 400 rwhp, it popped.

We installed another factory HG and made 440 rwhp and it popped again - as far as we know. We haven't pulled it apart yet. The second time was completely my fault as I was pushing the car down the strip with the ignition popping all over the place, so it very well may have survived much longer above 400rwhp+ .... but not worth the risk IMO.

from here http://www.mr2oc.com/showthread.php?p=1 ... ost1450199
so it's not the original one in there, but it is a stock one.

by **Adamal** » Sun Nov 20, 2005 12:06 am

When you're talking that kind of HP, I wouldn't stick with an OEM head gasket....

by **fivebob** » Sun Nov 20, 2005 12:08 am

Adamal wrote:When you're talking that kind of HP, I wouldn't stick with an OEM head gasket....

The stock head gasket is only a problem on Gen I & II engines, later engines used a MLS gasket and don't have the same issues with high boost.

by **Adamal** » Sun Nov 20, 2005 12:12 am

What sort of pressure levels can they withstand?

by **fivebob** » Sun Nov 20, 2005 12:34 am

Adamal wrote:What sort of pressure levels can they withstand?

As much as any aftermarket gasket. As failure in uncommon it's a bit hard to determine a failure point, but it's certainly higher than 25psi

BTW if you want to see what fails on a 3S-GTE (mainly Gen II engines) go to http://www.gtfour.ca/howtoblowyourengine.html

Website · by Al » Sun Nov 20, 2005 12:47 am

Akane will have to add his name to that list

no grip · by **Akane** » Sun Nov 20, 2005 3:04 am

All in the name of R&D so you guys can enjoy the benifits. I shall add my name there.

no grip · by **Akane** » Sun Nov 20, 2005 3:17 am

OK, I just read some of their posts. I don't really fit in there, as what I've blown is all due to human (dodgey mechanic) errors (and some of my own).

It's not "Look I've done everything right but I blew something up" kinda thing.

Most of their booms are unexplainable, but mine are.

Oh well.

by **Adamal** » Sun Nov 20, 2005 9:05 am

fivebob wrote:BTW if you want to see what fails on a 3S-GTE (mainly Gen II engines) go to http://www.gtfour.ca/howtoblowyourengine.html

Thats a very interesting read. Cheers for that

by **Ako** » Sun Nov 20, 2005 1:36 pm

Looks like I'll be buying a certain forged bottom end then...

I won't be pushing it THAT hard, going to flick off the T78 which is on it now and go for something a bit more usable (GT35/40ish :twisted:

). Mega power would be nice, but even aiming for 400hp is going to be a shitload of go in a street driven MR2.

Steel head gaskets - worth the trouble? Or can the stock unit take sub 20psi ok?

Website · by Al » Sun Nov 20, 2005 2:07 pm

May as well go a steel one as they arent expensive.

by **Punter** » Sun Nov 20, 2005 2:59 pm

Akane wrote:Most of their booms are unexplainable, but mine are.
Oh well.

alot of them seem to be running 91 octane.

no grip · by **Akane** » Sun Nov 20, 2005 3:12 pm

Punter wrote:
Akane wrote:Most of their booms are unexplainable, but mine are.
Oh well.

alot of them seem to be running 91 octane.

Been told their rating are different to ours, something with Mon and Ron.

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