Ok. I've got a 97 celica with the 7a-fe engine. It's a high milage engine, but it was been taken care of since birth.. haha. Anyway, I earn for more power but don't have the resorces or time for a 3s-gte swap. On the other hand, turbocharging is a very reasonable idea.. My question concerns the strength of the 7a internals. How much boost can they handle? Would it be a good idea to rebuild the engine with forged internals before turbocharging? What would be the best way to supply the extra needed fuel for the boost? Thanx for any help, I'm a little new with the aftermarket.

Jake

If you guys cant answer this with out using the word search dont post.

Thanks
DEF

it really depends on how much boost you want ... if your going to keep it under 10psi then you should be fine... and if you rebuild the motor run it for about 10k miles before you install the supercharger.... look around the old threads... i'm sure all the questions you have have beenn answered and if not post again .. some one on here will give you an answer sooner or later.

i have the stock internals on my 7afte and at 8PSI it runs fine. if u want more then that u have to go forged because the rods are too weak. and even with forged internals only plan on 15 lbs of boost cuz the cranks in the 7A's arnt that great.

Thanks for the help. A few more questions real quick. I don't have dreams of a demon street car or anything like that. I'm looking to run around 175hp on the street. What kind of boost will it take to get there? Can the stock internals handle that? The 105 hp merely don't hold it's own against the cars in this area...

-punkrocknurmama+Aug 22, 2005 - 9:23 AM

an please I think u are not a stupid guy, then for sure u've seen the SEARCH button in the frum.....please USE it cuz it has been discussed 100 times at least >> u'll find answers for all your quests >>

-StreetRacing10PSI+Aug 22, 2005 - 12:09 AM
the 7a crank has seen 300 horse on a 7agte

-punkrocknurmama+Aug 22, 2005 - 12:23 AM

look in the how to section i wrote up one on turboing a 7afe my old kit is now on StreetRacing10PSI's car now if you have anymore questions on this just pm me and look in my 7agte build dairy there you will see a built 7a bottom end

please read the stickies cause there is a lot of great information there on this topic

http://www.6gc.net/forums/index.php?showtopic=28068

This post has been edited by playr158: Aug 22, 2005 - 10:09 AM

-nik+Aug 22, 2005 - 7:54 AM


agreed, the 7a crank is a manly man to say the least. it has larger journals and such than a 4agze... and I have seen them make over 400whp.

-FallenHero+Aug 22, 2005 - 9:24 AM

i wish they would have made an 8 bolt crank (4ag) instead of a 6 (7af) but all in all its a really good crank

This post has been edited by nik: Aug 22, 2005 - 4:17 PM

yea, but from the looks of the block, it's not going anywhere. I do, however, agree with you. Probably make you sweat less when cranking up the boost for that dyno run. >>

Don't the 1UZfe engines have six bolt mains? (this is a random question.

This post has been edited by FallenHero: Aug 22, 2005 - 3:08 PM

-FallenHero+Aug 22, 2005 - 1:07 PM

dont know i really havent looked into the 1uzfe that much

Ok fellas. Thankx for all the help. I just had one more question. I know that a lot of people on this board don't like the idea of nitrous. I was never partial to n2o myself.. but the big question is why? If the 7a-fe can handle 8psi reliably, then why not a 50-shot of nitrous? It's about the same hp gain isn't it? From what I read, the rods and crank are the weak points of the engine.. but wouldn't those parts be under the same pressure with n2o as they would with 8psi? Thanks

its not just pressure its the chemical reaction....the physics of it is totally different
you wanna see 7afe with No2

then go to the little search button on the top right of the screen click it
type "7afe laughing gas" look at the picture

turbo cars its a build up to power

nitrous injected cars its all that power at once and for how ever long you hold the button


a safe nitrous system HAS the wot triggers and safety items which is the way to go also you need fuel mods different plugs and dyno time to make sure your A/F is where it needs to be.

dont just buy a half @ss kit off ebay strap it on and hit the button in first gear at 2500 rpm

now if you get a good kit dyno everything there is still the possiblity it can ruin your motor the 7afe pistons are not the greatest so now you get into internal mods which IMO is the safest way to run Nitrous a mild built motor with rods pistons and fuel mods and way to control it all