4af engine modifications idea/problems

[ae924af]

I know people have compiled some info out there for the 4afe and the 4age but there seems to be little on how to modify a 4af engine. I know that it is not a normal engine to modify but i dont think i am the only person who wants to modify this engine. I have considered doing the 4age swap but right now im trying to see how much Hp i can get out of a 4af. Here is the this of things i can do

A engine rebuild kit at http://www.rpmmachine.com/shop/index..._detail&p=5457

Then an Aftermarket exhuast http://www.streetperformance.com/par...2-70-1153.html

Then a Weber DCHOE 32/36 I hope to put a scoop to for the air into the carb.

Now i am not sure about the flywheel..... will a 4age gts flywheel fit onto a 89 corolla sr5?

Anyway i was wondering What else i could do to the car and what is the Highest Hp someone has gotten out of it. I hope to tackle this whole things as a senior project and document the whole process on this forum as well.

[NZAE92]

hey
i have spent money onto my 4af engine headers, exhaust, aftermarket air filter etc, there isn't much else you can do to the 4af engine. I could've spent the money on doing a 4age 20v conversion, i also thought i could be different but im still never going to get the amount of HP that a 20v would put out.
your best bet would be just to do the conversion and spend your money wisely, mind you i have enough power to blow the socks off an Altezza.
expect the unexpected.
Good Luck.
Greg.

[Blof-fan]

No, the 4A-GE flywheel will not bolt to the 4A-F crank. The 4A-F uses a 6 bolt flywheel/crank. The 4A-GE uses a 8 bolt flywheel/crank.

But why would you want to change the flywheel? Try to lighten your current flywheel.
Give the head a good port job, get a nice exhaust header. Maybe fit a less think multilayer steel headgasket to up the compression just a little bit.
Maybe you van even see what can be done about the camshafts.

I guess It'll put out a little more.

[Flashmn]

Then a Weber DCHOE 32/36 I hope to put a scoop to for the air into the carb.

If you're talking about a weber DCOE then theres no such thing as a 32/36, DCOE's are dual carbs, you need two of them one carb for each cylinder. They'll breathe alot better, but getting them tuned might be a harder thing for a novice to do.

[ae924af]

Anyone know if it is even to double the Hp of the engine in this car? And how much am i looking at for a swap to a 4age? SHould i swap to a 16v or a 20v?

[Flashmn]

You arent gonna double the hp with a silvertop or a 16V swap either... You really didnt read what anyone else was answering to you except about the swap, did you? In your first post you want to keep the 4A-F, now you wanna change it... Make up your mind first, stick to it and then start to asking for advice.

[TonkaTom]

I believe that you would swap heads with the 4afe for 10 more hp, but you are better off with a 4age.

[canadianae92]

well first of all i believe there is a 7afe head that flows a lot better than the 4afs but is the design the same for valvetrain? i dont know, anyways a rebuild with lighter rods higher compression pistons + balancing and big cams would get you fair power

or you could go with forced induction since high compression pistons for a 4af would probably have to be custom made while you can use forged low compression pistons ment for the 4age since you should have to worry about valve cut outs with a piston that has a pretty deep dish

to double the hp you will need a better flowing head/exhaust/intake a built block, massive head work probably with big cams and done up valvetrain and some form of engine management

even then it would be easier to double it if thats even possible if you went with a 7afe or 4age and built a 4age

i think to modify a 7afe head might be cheaper than a 4age since you have rockers and dont need to worry about flipping shims with big cams, rockers could pose another problem at high revs or with big cams but i dont really know since i have no experience with them

[Flashmn]

2nd gen 4A-FE head is the same as the 7A-FE head.

to double the HP, easiest is to slap on a turbocharger.

[ae924af]

KNow any turbo chargers for the 4af engine?

[Flashmn]

A turbocharger is a device used to add more air by force induction, there is no "Turbo for a 4A-F" you have to choose which turbo you're going to use and piece a kit that consists of the needed parts.

[ae924af]

Well would i have to change anything on the inside? And know any setups is what i meant but thats for reminding me that this is a device. I just havent seen a turbo setup on a carb engine before.

[NZAE92]

there are many turbo setups that run carb's but im not sure if it has been done on a 4af? and they wouldn't be very common because the carb has to be setup as a "blow through" to be able to take the boost from the turbo and into the cylinders. there is no point turboing a 4af when you could spend an extra $500-$1000 on a better engine and use the money for the turbo setup on that engine.

[Flashmn]

Just encase it in a pressure box, then figure out what jets you need. Easiest way to do it.

That wouldnt even cost much. Efi fuelpump, regulator for carb pressures with boost reference, the pressure box and tuning, turbo and manifold stuff. prob less than 500 bucks if you use used parts.

[NZAE92]

your right there flashmn But would you rather spend the money on getting a better engine and turboing that or turboing a 4af??