SC'ing an NA

[GrammerBoy562]

done for

[ToyotaTechGeek]

Originally Posted by GrammerBoy562

i am not BS and your not helping why are you guys just putting me down? im just saying wat i knoe and wat i was told. and about my grammer or punctuation i dont give a damn wats on here this aint no skool easy report gosh! so forget all of this and all i said ill set it up with my people help. but thanks by the way.


BTW i knoe wat ive done and i knoe wat a little beast this is... i still dont understand why ok pplz. i bought the car like that and with a little help from my girl cousin he told me wat internals to get for the block. i knoew its hard to believe and i dont understand why so ill just drop it and fined a way to do it myself. thanks again. later!

you know, i'd love to help, but if you guys are building 200 to the wheels with an na, and i don't have that with an sc, then there's nothing i can do for you aside from tell you your grammar, punctuation, and general syntax sucks!

[feral4mr2]

Originally Posted by bspecmr2

Oh please. Think about it. The people who ask if they can supercharge their NA 4AGE are 99% people who don't know much if anything about the process, so why not save them the troubles of finding out the hard way and get a complete swap. A person who's capable of building up a high comp Na setup with a supercharger or a turbo does not need ANY advice on this.

if you want to supercharge it, get the GZE intake manifold, fuel rail, injectors, intercooler and piping. Run a stand alone fuel management system as the stock electronics can't handle the high compression of the pistons and you'll go BOOM. good luck.

The GZE block is a better platform to start with when you plan on turbo/super-charging. A stock GZE block will hold up just fine with pretty high amounts of boost. The problem in making power usually is the restrictive SC12 or stock electronics. If you've seen people refer to turboing a 4A the chance they're using a GZE block is 99/100 unless they've done modifications to the internals of the engine.

you do realise that 87+ bigport 4age is the same engine as the 4agze bar the pistons? which by the way the 9.4:1 c/r cast pistons handle boost very well.
and stock 4agze electronics work well with 9.4:1 c/r pistons and boost.

bah, forgotten all i was going to say now.

[TheAmazingDave]

Originally Posted by GrammerBoy562

i am not BS and your not helping why are you guys just putting me down?

Because it is well known and documented that a 200 crank horsepower 4A-GE is not even a streetable engine, meaning it is set up so wild that it only stays running when your foot is on the gas. It would be a bitch to idle. Yet you claim to have 200 wheel horsepower.

So unless you can provide a dynosheet showing your car has done reliably what Toyota's racing department couldn't do, then people are going to think you're a dumbass, to put it bluntly.

And as said, a good running GZE, with it's mighty 145 crank horsepower, will take some wild cars. So if you were had by a V6 Sloara, you are not pushing 200 hp.

[bspecmr2]

thanks for clearifying south bay neighbor

[TheAmazingDave]

no worries.

[novatc]

that guy is spending a lot of money on that NA. did you know you can get a 4agze engine and trany off ebay, from JDM imports, for about 900-1200. bang-for-buck, I'd go with one of these engines, tweek it to 200hp. as far as that solara thing, one thing to remember POWER-TO-WEIGHT ratio. Yes, that solara will have more power, its also got a hell of a lot more weight to pull around, and its FWD(can you say-WHEELSPIN bad)I got rid of my 170hp contour because of that problem, good in the straight line though. you ever price a clutch for a ford duratecV6, $350+(parts) at the dealer. don't need that domestic crap. one thing I like about the MK1s is that they are a very simple sports car, no power steering, no slushbox(autotrans), no BS. and the cars are easy and cheap to work on.

[TheAmazingDave]

Originally Posted by novatc

no slushbox...

Sadly, AW11's were offered with an optional autotragic transaxle.

[GrammerBoy562]

done for

[sliverstorm]

To put it yet another way, if you get 200 whp, that's something like 125hp per liter, which is crazy in N/A. Even VTEC doesn't make that kind of power. To pass vtec you'd have to use high profile cams- maybe higher than the vtec secondary cams usually go- and from what I've seen of honda dynos, the vtec secondary cams would (with some mental extrapolation) make a curve that hits 0 hp and 0 torque at about 2-3k rpm. So do you run cams bigger than those?

P.S. while this may not be english class or an essay, terrible spelling and grammar achieves exactly one thing; it pisses off the people reading your post. Generally speaking, pissed off people are going to be less willing to put themselves out to help you. Worst part is yours is so bad it looks like it's intentional, which is even more agitating.

[Adrians89MR2SC]

hey .. just a little past experience ..

DO NOT SUPERCHARGE A N/A

[Adrians89MR2SC]

oops .. lol .. clicked enter ..

but neways .. i bought a 89 mr2 sc.. and i recieved 2 motors with the car .. one newly build ..

and then other the stock block and internals ..

the newly built one was a n/a .. didnt know untill driving the car

i assembled the car (bought in pieces) and as soon as i started the car the head gasket gave out partially .. and fully blown after 14 miles (smoke pouring out the back and oil and coolant pissing out of the exhuast

so .. if you do want to put a supercharger on a n/a .. you have to build everything perfect ... metal headgasket .. arp head bolts ..

and when you initially start the car you must unplug the supercharger and break in the motor .. then after break in .. somehow apply 1 pound of boost per week untill you get up to 8 ..

these are the instructions i got from the guy who built the motor .. after i blow it .. lol ..


so now i rebuilt the stock 4agze and its purring like a kitten .. but has nowhere near the amount of torque and hp from the high comp pistons ..

also .. you may have to use high octane fuel (premium) and octane booster .. to avoid detonation ..



long story short .. if you can keep the head gasket from saying goodbye .. then go for it .. definitly worth it unless you plan to do a v6 or 3sgte swap .. then i would just start saving money ..

[feral4mr2]

Originally Posted by Adrians89MR2SC

hey .. just a little past experience ..

DO NOT SUPERCHARGE A N/A

i do not concur with that. you can turbo a na 4age and it loves it, why not s/c? give it a good i/c, larger injectors and if you can a aftermarket ecu (i use gze ones) and it'll be as reliable as a stock 4agze (and it tuned right more hp too).

[TheAmazingDave]

I agree with Feral, it's not necessarily boost that kills the NA pistons, it's mostly all in the tuning and timing.

[Adrians89MR2SC]

well .. them 9.4:1 pistons and some boost instantly blew my 4age i had in my 89 mr2 .. also read up alot about detonation .. some say it will always happen .. and will destroy the motor / pistons... and some say you dont have to worry about it



also if you take a 4age apart and compare it to a 4agze .. the internals are completely different .. and alot heavier ..

i guess i might try that 4age again then .. with my 4agze intake .. but this time ill use arp bolts and a metal head gasket .. stock ones say goodbye real fast

[feral4mr2]

depends on what 4age you have, the early 3 rib bigport 4age has smaller conrod big and little ends (40mm, 18mm), where as the later 7 rib bigport has the exact same internals (conrod = 42mm, 20mm) as a bigport 4agze, the only difference being the pistons.
i have the 7 rib bigport 4age with it's 9.4:1 casties boosting happily on 12psi since 2002.

i agree with arp head studs if you want to run a lot of boost, but i dont agree that a metal headgasket has to be used. the toyota stock 4agze headgasket handles a substantial amount of boost.

[Adrians89MR2SC]

hmm .. thats intersting .. i wonder why that motor blew then .. probably was allready shot when i got it .. bearings were screwed after the head gasket blew .. but ill either try the supecharged 4age again (running a stock 4agze right now ) .. or im thinking of doing the v6 swap .. my 89 was the first v6 swap in the US .. but when i bought the car joe vick took the v6 out and gave me all the stock parts .. he did that swap a looooong time ago .. theres a pic on some website i found .. he put a trd supercharger on it too .. but if i do it .. then ill probably turbo it if i dont leave it n/a ..

[Weasy2k]

i agree man...5psi in a motor is not much at all..if you wanted to s/c the block to a higher 8+ number then you are not looking at a happy camper, but 4-5psi..pfft even the 3vz-e (not FE) can take that :P