Homemade supercharged 4age . How long before BOOM ?
 

currently rebuilding a smallport 4age 16v to try out a budget set up. Currently got a walbro 255 fuel pump, toyota sc14 blower, 4agze ecu and 365cc injectors, cheap boost guage, a few belts and mounting brackets.


Now here is the part that has me worried, the motor has a 10:3 c/r and i am not gonna be intercoolered . Timing will be retarted at the dizzy a bit . Pump gas is the only thing available on my island. Cant afford low comp pistons or intercooler right now. (strip clubs took a bite out of my savings) . Will detonation be a problem at 6-8 psi ? Spent the better part of this week reading ---- all over the web. Getting mixed opinions . What do guys think ? I know i sound like a noob but there isnt much info about set ups like this around

Re: Homemade supercharged 4age . How long before BOOM ?
 

you will be just fine. go a step or two colder on the plugs, and run the highest octane fuel they have on you island. if those pistons are stock then i would keep it under 10psi. if they are forged then boost the hell out of it. 10:1 is nothing to be afraid off

Re: Homemade supercharged 4age . How long before BOOM ?
 

or, get an extra thick head gasket

Re: Homemade supercharged 4age . How long before BOOM ?
 

Saw thick head gaskets going for $185 usd on ebay. Thats cash i dont have to spend right now. Any hmt solutions to lower c/r ?


They only sell pump gas on the island. ---- i have never even seen octane booster anywhere. the pistons are stock. The abv on the blower will ensure that i dont exceed 8psi , anything more and it will vent the excess. May try to put a bigger pulley on the blower to lower boost to about 5 psi until i get the ic and forged pistons by xmas. Thanks guys keep the replies coming

Re: Homemade supercharged 4age . How long before BOOM ?
 

I agree with you about the plugs, but my experience with supercharged 4age's is that they have VERY high IAT's from the factory, WITH an intercooler. Not to mention, the factory setup heatsoaks the ic with no more than a minute idling at a red light, and thats in moderate weather, not the temps you see yearround. Yes, you might be able to run it without an ic, but det. is your enemy and it will rear its ugly head, even with timing retarded. Too much reduction in timing will make it run hot, its an iron block, and cylinder head cooling is a concern. Running a turbo/supercharged 4a without forgings is fine, as long as detonation is kept in check. The poor factory ecu systems dont help your cause either. Forget about using an AFC or other piggyback to bump up your fuel. It wont work. Even at 8psi, you can still knock.
Not to mention, even small ports are semi-prone to blowing head gaskets. Putting a thicker head gasket will help, but it wont solve the problem.
Solution=GOOD IC + Tuning capability. Ive seen stock longblock blue tops make 250hp with good tuning. (turboed, good luck hitting that number on even the sc12) .

BTW what island do you live on?

Re: Homemade supercharged 4age . How long before BOOM ?
 

..two felpro gaskets

Re: Homemade supercharged 4age . How long before BOOM ?
 

yeah, i was just going to say that, however, it will be partly negated by the lack of quench that you'll have afterwards.

Re: Homemade supercharged 4age . How long before BOOM ?
 

it will also through your cam timing out depending one which side the tensioner is on (ie retard or advance depending).

Re: Homemade supercharged 4age . How long before BOOM ?
 

Im from Saint Lucia (st.lucia) its west of barbados. Mid to high 80s all year round. I will definitely run the colder plugs. Any particular brand you guys recommend ? i will be using a sc14 not the baby sc12, im not really looking to hit 250whp yet, just looking to get a lil get up and go , somewhere around 170whp will be fine for now . i agree the stock intercooler is a waste, may be if its moved some how to the front where it can get better air flow then may be it might not be half bad, i have a set of sleeve over springs that i can probably trade for one.... So in your opinion the stock small port + sc14 wont last long?



Was originally trying to go non intercooled turbo, but the price of buying a manifold online and having it shipped to me quickly added up. Was looking for a CHEAP b series mani in the classifieds that i could cut and weld the 4age flange on but found nothing in my price range ($50-$80). Really thinking about a homemade sink trap using the stock piece.

Re: Homemade supercharged 4age . How long before BOOM ?
 

please elaborate . What is a felpro is a brand name ? Where can i get then and how much ? Thanks

Re: Homemade supercharged 4age . How long before BOOM ?
 

Felpro is a brand for cheap composite headgaskets. He's talking about stacking 2 stock headgaskets, but that will affect your cam timing.

Re: Homemade supercharged 4age . How long before BOOM ?
 

Oh ok. They only make the gaskets in the stock thickness ? Anywhere else i can get a cheap thick gasket

Re: Homemade supercharged 4age . How long before BOOM ?
 

The sc14 isnt big enough to be anything "more effecient" than the sc12.

Thicker head gasket is not your solution. The static compression ratio isnt your problem. 10:1 is fine for a turbo street car with proper tuning. A metal HG will be in your future though if you pursue this project.

The Sc14 is big enough however, to put the shitty factory maps into chaos mode, you WILL run lean. The stock supercharged ecu is a joke, and on top of that you will be running a larger than stock supercharger with no intercooler(which is a mistake) and the computer CANNOT compensate for its maps at WOT>read engine carnage.

You do know that the stock cast manifold tappers enough at the 3/4 point to cut, and weld on a t3 flange right? You dont need to build a manifold....


Why is it that you dont want an intercooler? Water to air is your friend with an mr2.....OR if you have a sawzall trunk mount one. IC's arent that expensive anymore. If you cant afford even a shitty one, you cant afford a turbo car period.

Re: Homemade supercharged 4age . How long before BOOM ?
 

what hes trying to say is, at the least, intercool it, and at preferably intercool and megasquirt or some other tuning solution. if you retard the dizzy enough to make it not blow itself apart, idle will at the least suck as will off boost driving.

Re: Homemade supercharged 4age . How long before BOOM ?
 

Lol im slow. I get it now. I guess i will try to trade the sc14 for a sc12 and a "shitty" fmic . Also thinking about trying out a similar set up like what that guy had on his aw11 mr2. Think his name was 86mista2. Its in the projects sticky. Cut stock stock manifold and and a t25. Got a friend with a t25 and a fmic laying in his garage. Might try to talk him into trading it for the sc14. He also has two of the gze intercoolers and a sc12 too.


I bought all the parts i have from him, he will also be helping me with the install on the car too. I can always trade the parts back with him for other stuff he got laying around but dont have any spare cash left to buy anything else.


The non intercooled sc14 is out the window now. Trying to decide between a a full factory sc12 set up with the gze intercooler or if i get lucky the fmic. Or option two, similar set up like the mr2 guy. One last thing, i have a ae92 levin not a mr2.

Re: Homemade supercharged 4age . How long before BOOM ?
 

LOL have u seen the ringlands on highcomp 4ages? I give it a 2 weeks.

Re: Homemade supercharged 4age . How long before BOOM ?
 

keep the bigger charger if you are going to charge and not turbo. but sort out the fmic and ms.

Re: Homemade supercharged 4age . How long before BOOM ?
 

Why yes. I have built a few turbo/supercharged 4a's thanks for asking. Hince the fact that Im trying to veer him towards some kind of standalone, ms, etc. Ringlands on 4a's fail because of det. and spikes in cylinder pressure. Which is why retarding the dizzy isnt his solution.

Re: Homemade supercharged 4age . How long before BOOM ?
 

Traded the springs for some piping and a 4agze or 3sgte intercooler, not really to sure which it came from . Compared it to another gze intercooler we had and its a bit bigger. Gonna mount it somewhere behind the bumper til i get a bigger fmic. Got a friend with a wide band that will be helping with the installation and tuning.

Also just found out that shell is selling some new v-power fuel that they claim is 100 octane. still waiting on confirmation on that . The guys in antigua with 500+ whp starlets , civics, skylines, levins etc are all claiming it works well

So.....how did it go?

How much boost did you end up running....?

I'm thinking of doing the same!

Cheers
David
Perth, West Australia

Nobody mentioned water/meth injection. I guess it really depends on if this is just a weekend beater or a daily driver. Water injection would solve the problem but you would have to fill the tank. You could get one of those 8 gallon race fuel tanks and it should last a long time between fill ups.

ended up using the sc12 and stock 4agze intercooler. Was running about 9 psi on the stock pistons. later swapped in 4agze pistons. Now i went turbo. Using a t28, still on stock ecu.

Water injection is a hassle for me. iling up tank would be a pain in the ass.

Yeah. Thats the only reason i would never do it. Gotta mix it and fill it up. And you never know when you run out unless you check it all the time.