7afe vs 4age

[vvega]

thast a 97 caldena 7a rod v's a silvertop road(yes its poilished)



7a rods



pick of some detanation on a pistion

some things to remeber
longer rods are stronger due to less inclanation angle
the rod bolts bolt in from the bottom so they do not have the step cut into the top bearring raduis that is teh main fractuire point for most rod failures

hardly toothpicks IMO

v

[no_8wire]

o
Would any one with a compression calculator be able to tell me what the compression would be if I had:

Pistons: 4AG-ZE Supercharged.
Crankshaft: Standard 7AF-E
Conrods: Standard 7afe
Compression Ratio:?

????

what head are you going to run....that will determine ur compression, also what pistons the 8.0:1 gze ones or the 8.9:1 gze ones...

Silvertop head, and the 8.9:1 ze...

[Drifter4ag]

200whp is no feat ... you can do that reliably on a bluetop turbo engine .... the 1.8l i would be afte at least 200kw mark or you are wasting your time building it.

[Mr Revhead]

forget hp.... torque is where its at

[Bazda]

The early posts by people who seem to have done 7ag years ago, labeled the rods as toothpicks. Why? thats the puzzle.
Nobody in more recent threads could say;
if was the rod or the bolts that failed
was it during hi rpms
or even give an idea of the 'breaking point'
A look at turbo 7AFE projects could give a hint
An ae86 hit 200whp; sc14 + ze pistons on 7a rod with ARP bolts
I'll copy, turbocharge and 'push' that same setup
My curiosity lies in seeing if a 7agte could keep up with a ca18det.
If u have to buy rod$$$ & forgie$$$$, makes alot more sense to stick with the ca18 which has soooo many other advantages

we arent talking about a ca18. try and fit a ca18 into a fwd corolla is it going to be cheaper then...

[ezy10s]

Pfft nissan..... bah

[matt dunn]

makes alot more sense to stick with the ca18 which has soooo many other advantages

My car is only 4AGTE (20V) 1600cc and for years kept up with the CA18DET's that ran in it's class,
I would not rate one much more than the other.

Matt

[Mr Revhead]

oh yeah..... in oz toyota slapped a turbo on the 7afe... only runs like 8 psi but they seem to go fine.
think ill see if i can find more info on them

[dash]

Hell, I consider a 7agte a waste of time if chasing under 300hp atw.
Yep, it's more about the torque gained. Then again..... 300 ft-lbs of torque at the threads, in a relatively lightweight fwd street car... what would you do with it ? A double edge sword, eh
I wouldn't try a ca18 or 300# in a fwd rolla, cheaper or not.

not a ca18 thread, but we rwd would be foolish not to weigh the cost vs benefits. (Good to have ez options, eh)
Its a relatively simple swap in a ae86 with potential off the scale, for very reasonable money. *Mod for mod/same hull*, a 4agte is no match for the tq of a ca - a significant difference in a full wt street car. I don't believe in weight reduction/degradeing a car, turning it into a pos just for the sake of acceleration. Hence the 1.8 interest.

I've looked over alot of turbo mazda BP (1.8L) vs the ca18, and with equal mods they are strikingly similar in performance/dyno. I'm just curious to see how a 7agte will stack up against the mazda and nissan 1.8L, seeing as this is a 'hybrid' and not a 'toyota designed combo' that left the factory this way.
Miata 1.6/1.8L rods show up as the weak link when turbocharging their stock motors into the "hairy zone". At a '400hp shootout', one *bone stock* 1.8L dyno'd 399whp and an impressive 380 ft-lbs tq. That miata ran a 10.9sec 1/4... witnessed by many.
Seen ca18 do 396 on stock innards also, with 'less than optimum' tune.
So I can't help but wonder if a street trim 7agte could do 300+hp/tq on 7a rods + ze pistons reliably... that is all.

[vvega]

i believe ezy 10's turboed a stock 7a in a caldena a few years back ant got something near that figure
no decompression just a turbo

its all in the tune
till you get to 14 psi revs are the biggest load on the rods
after that power comes into play

v

[no_8wire]

Hell, I consider a 7agte a waste of time if chasing under 300hp atw.

...Hmm I was wanting about 300 at the flywheel...for this project to be worth doing...
So far I will need...
Turbo( Ball bearing type?)
+ associated items, IC piping etc
7afe block, rods and crank
20v head
the 8.9:1 zg pistons
and 18psi?

Oh and Ecu to run it!

That a summary of the basic items I will need?

[Caveman]

Hell, I consider a 7agte a waste of time if chasing under 300hp atw.

...Hmm I was wanting about 300 at the flywheel...for this project to be worth doing...
So far I will need...
Turbo( Ball bearing type?)
+ associated items, IC piping etc
7afe block, rods and crank
20v head
the 8.9:1 zg pistons
and 18psi?

Oh and Ecu to run it!

That a summary of the basic items I will need?

to add to the list.

Manifold for turbo
dump pipe
mate to original exhuast or new exhaust
bigger injectors, pump
fuel pressure regulator
probably new bearings for the new block
adjustable cam gears
all the sensors, etc

for 300HP you would probably need a t3/t4, vf22 or GT35 imo

stop talking about it and do it

[Bazda]

You dont need adjustable cam gears.

You have to get a new key way cut on the pinion gear to bring the timing right. The engine will need to be retarded 10deg.

Doing the key way cut is about 4-6 times cheaper than the cam gears

300hp/230kw atw prob wont be to hard to get out of the 1.8L as the 1.6L can get that by changing cams and running a big t3/4

[Caveman]

You dont need adjustable cam gears.

You have to get a new key way cut on the pinion gear to bring the timing right. The engine will need to be retarded 10deg.

Doing the key way cut is about 4-6 times cheaper than the cam gears

300hp/230kw atw prob wont be to hard to get out of the 1.8L as the 1.6L can get that by changing cams and running a big t3/4

What sort of computer? If this the setup with a standard 4agze afm ecu? do you know how the a/f was?

[Ako]

Hell, I consider a 7agte a waste of time if chasing under 300hp atw.

...Hmm I was wanting about 300 at the flywheel...for this project to be worth doing...
So far I will need...
Turbo( Ball bearing type?)
+ associated items, IC piping etc
7afe block, rods and crank
20v head
the 8.9:1 zg pistons
and 18psi?

Oh and Ecu to run it!

That a summary of the basic items I will need?

to add to the list.

Manifold for turbo
dump pipe
mate to original exhuast or new exhaust
bigger injectors, pump
fuel pressure regulator
probably new bearings for the new block
adjustable cam gears
all the sensors, etc

for 300HP you would probably need a t3/t4, vf22 or GT35 imo

stop talking about it and do it

GT35 for 300hp

Try 600hp...

GT28 of some sort will do the job fine, any bigger would be a waste of time. T3/T4 can happily cover 250hp to 600hp, just depends on which one you get, you do have a choice of thousands afterall

Fuelling - you going second hand or brand new parts? The price changes dramatically for new gear, your call though.

[Bazda]

You dont need adjustable cam gears.

You have to get a new key way cut on the pinion gear to bring the timing right. The engine will need to be retarded 10deg.

Doing the key way cut is about 4-6 times cheaper than the cam gears

300hp/230kw atw prob wont be to hard to get out of the 1.8L as the 1.6L can get that by changing cams and running a big t3/4

What sort of computer? If this the setup with a standard 4agze afm ecu? do you know how the a/f was?

yep standard computer with an extra injector, I ran it very rich at around 10.8, if i didnt run the extra injector 12psi was max at around 12.5.

[no_8wire]

Hell, I consider a 7agte a waste of time if chasing under 300hp atw.

...Hmm I was wanting about 300 at the flywheel...for this project to be worth doing...
So far I will need...
Turbo( Ball bearing type?)
+ associated items, IC piping etc
7afe block, rods and crank
20v head
the 8.9:1 zg pistons
and 18psi?

Oh and Ecu to run it!

That a summary of the basic items I will need?

to add to the list.

Manifold for turbo
dump pipe
mate to original exhuast or new exhaust
bigger injectors, pump
fuel pressure regulator


for 300HP you would probably need a t3/t4, vf22 or GT35 imo

stop talking about it and do it

sensors I will get off currnet engine... Fuel pump..hmm

[no_8wire]

Fuelling - you going second hand or brand new parts? The price changes dramatically for new gear, your call though.

Prob 2nd hand....injectors any way... Some 3gtse ones should do it..( Ihope)