Preformance for 1988 NON-sc

[Jinxx532]

what is the best thing to do to a 1988 MR2 t-top 5 speed car? quick horse power, and the best turbocharger or supercharger? or should i just keep it stock?

[ebouwman]

Don't supercharge or turbocharge that engine. If you're thinking of that, simply don't do it, just swap in a new engine.

As for the stock engine, start with a cold air intake, and do a tune up, there is power to be had simply by freshening up your 21 year old engine. After that you could get a new exhaust to help with the engine breathing, i found a used trd header for mine and did a new exhaust and that helped.

Then come the cams but thats where it starts to get expensive.

I've heard of people blocking off the EGR to squeeze a bit more out of the engine, but i don't know how much that actually gives you though.

[toyotaspeed90]

Lots of wrong info...

the stock early 4age's are somewhat low compression, have a forged crank and relatively beefy rods... you should be fine up to about 7-10psi on a smallish turbo... you can run a stock sc12 supercharger, but you will need all coresponding parts and/or fabrication.

I wouldn't recommend running any forced induction without at least a piggy back computer or a stand alone.....

blocking the egr off does absolutely nothing for performance -- the egr is closed at WOT, so it doesn't engage when racing whatsoever....

however removing the egr does clean up a LOT of vacuum lines and mess around the trans.

[Jinxx532]

that's what i was thinking getting a really small turbo, and just run about 5 pounds of pressure. I look on the web and couldn't find anything. Would i have to get a new intake manifold?

[ebouwman]

Originally Posted by toyotaspeed90

Lots of wrong info...

the stock early 4age's are somewhat low compression, have a forged crank and relatively beefy rods... you should be fine up to about 7-10psi on a smallish turbo... you can run a stock sc12 supercharger, but you will need all coresponding parts and/or fabrication.

I wouldn't recommend running any forced induction without at least a piggy back computer or a stand alone.....

blocking the egr off does absolutely nothing for performance -- the egr is closed at WOT, so it doesn't engage when racing whatsoever....

however removing the egr does clean up a LOT of vacuum lines and mess around the trans.

I didn't mean that it couldn't handle it, i meant that it would be easier and/or cheaper just to get a supercharged engine, or even a 20v.

What i meant was it simply may not be worth it. Once you fabricate or buy a turbo manifold, get the turbo, get an engine management system, and possibly an intercooler you'll have spent so much time/money on it that you could have done a swap.

Although it might be pretty cool to have a 4agte, simply because of the fact that it's a rare breed.

[Timon]

^ Even at a 4AGTE it'd be better to start with a 4AGZE.

[ebouwman]

Originally Posted by Timon

^ Even at a 4AGTE it'd be better to start with a 4AGZE.

Thats what i've heard as well, not sure why though, aren't the heads a bit different?

[Papo J]

Originally Posted by ebouwman

Thats what i've heard as well, not sure why though, aren't the heads a bit different?

FWIW, HKS built a turbo kit for the MK1 back in 86 so the NAs can actually handle boost and last if properly tuned. The GZE is built for boost and has the electronics to support boost including a knock sensor which the NA does not have. As far as the heads go, all the MK1 heads including the GZE heads are identical, all big port heads. The only notable difference is that the GZE heads have shorter intake studs.

[iceNine]

This might help. Look on the left, third row down.

Speed - Source - Design. Fabricate. Produce. Install. Maintain.

[toyotaspeed90]

Originally Posted by ebouwman

I didn't mean that it couldn't handle it, i meant that it would be easier and/or cheaper just to get a supercharged engine, or even a 20v.

What i meant was it simply may not be worth it. Once you fabricate or buy a turbo manifold, get the turbo, get an engine management system, and possibly an intercooler you'll have spent so much time/money on it that you could have done a swap.

Although it might be pretty cool to have a 4agte, simply because of the fact that it's a rare breed.

if they want to go turbo they would have to buy all of the turbo parts anyways.....

a 4agze is a great platform... I have one sitting in the driveway in my 87..... but if they want turbo, then saying that they have to go another route isn't correct..... it would be smart for longevity to use a 4agze block, but some people like me are kinda stupid and have enough cars that it doesn't matter.... I know the C series is weak on a gze but that's what I'm using (even though I have a perfectly good e51 & parts sitting in the garage). If it breaks I'll fix it and/or get into another car....

[Capt.Evergreen]

GZE block and 7 rib block difference... besides compression..... is there a differance??????
thanks much
Capt. EverGreen

[Jackstand Queen]

If you ran just 5 PSI or a little more, you'd end up wanting 15 PSI in the worst way.

Boost is like f'ing Herion I tell you! Very addicting.

[Papo J]

Originally Posted by Capt.Evergreen

GZE block and 7 rib block difference... besides compression..... is there a differance??????
thanks much
Capt. EverGreen

Besides compression and pistons the only other thing I can think of is that the GZE block has a bung for the knock sensor, the NA block does not.

[toyotaspeed90]

the early 7 rib didn't have the squirters installed.

rods are different

pistons aren't just different in compression, but have a ceramic coating on the top of the piston. Compression is only different because of the pistons -- both 4age and 4agze heads have the same combustion chamber.