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**TurboGt** · 02-10-2006, 01:31 PM

There are quite a few people running 10 psi on bone stock 3400 with no problems. As for the 3.4 I am not to sure.

**vega** · 02-10-2006, 05:47 PM

well yeah that be true but i am thinking that the 3400 is much more difficult to swap into the fiero then the 3.4 pushrod.... so yeah any info on the PUSHROD would be great.

**Guest** · 02-10-2006, 06:17 PM

Originally posted by vega

well yeah that be true but i am thinking that the 3400 is much more difficult to swap into the fiero then the 3.4 pushrod.... so yeah any info on the PUSHROD would be great.

Ummm the 3400 IS a pushrod engine.

Which 3.4 is you are asking about?

The F-body 3.4? or the genIII aluminium headed 3400?

**vega** · 02-10-2006, 08:57 PM

f-body iron head

**Fedaykin** · 02-10-2006, 09:45 PM

aparently this tiago guy on camarov6.com made his own t3 turbo and pushed it to about 15 psi on a mostly stock engine, bottem end was stock i believe, and I dont think he's blown it up yet. he swapped out to a T6 turbo as well and is now making upwords of 350hp at 12psi i think.

**vega** · 02-11-2006, 08:34 PM

is this true about the f body 3.4 pushrod from like 93- 95?

"The stock components in the later engines are pretty strong, some of the 3100s/3400s have reinforced cranks or rods or both whether it's by forging or using steel as opposed to cast iron. The hypereutectic pistons are quite strong they're just not as detonation friendly as cast or forged pistons but as long as there is no detonation issue the hypereutectics which I believe the majority of the engines use now if not all considering the high stock compressions should hold up to quite a bit of boost.

Having beat on cast pistons in a 2.8 and hypereutectics in a 3.4 behind a turbo, the hypereutectics took the most abuse. I broke a ring land on a piston in the 2.8 eventually having run as high as 12 psi boost but hoovering mainly around 7psi and chipped 3 pistons in the 3.4 after several severe bouts of detonation that were audible inside and outside the car resulting from a disconnected ground strap that affected timing; Despite the damage to the pistons it took quite a bit of driving before the problem finally started to show symptoms of the damage when one of the broken top piston rings cut deep enough into the cylinder wall to allow boost pressure into the crank case.

I doubt very seriously you need to do anything with the stock engine besides acquiring the proper compression ratio for boosting which you can do with a head gasket and making sure you have the proper engine management unless you intend to run very high boost levels, if I'm not mistaken the the Syclone and Typhoon have used hypereutectic pistons and possibly the 3800SC, according to my federal mogul catalog the Buick turbo cars received a mix of forged and hypereutectic not in the same engine of course and indicate also that trucks and utility vehicles tend to get the forged stuff so a V6 from a minivan or truck should be favored over one from a passenger car.

The 3500 has forged powdered metal rods and a steel crank so chances are pretty darn good that the 3400 has the same. You may want to look into getting a short block from an aluminum headed engine or better yet the rotating assembly to retrofit into a 3.4 block which would be easier. I chose to do the short block and make the few minor modifications so that all of the Fiero parts fit.

[This message has been edited by Joseph Upson (edited 02-11-2006).]

IP: Log"

**vega** · 02-11-2006, 09:09 PM

if that first site that f body had the 3.4 turbo was correc then the following would be true

1 PSI= 9.75hp and 8.125tq each increase

t61 at 10 psi= 338.75 hp and 413.625 tq
t61 at 15psi= 387.5hp and 454.25 tq
t61 at 20psi= 436.25hp and 494.875tq

**vega** · 02-13-2006, 01:57 AM

bump

**vega** · 02-13-2006, 11:22 AM

hmm... so do you guys not know? i mean i did do a search and i am not realy finding somhing so entirely related i mean there is a few but for the most part i need it all not just the rods and pistons i would prefer bearigns rings and seals too....

**tejohnson** · 02-13-2006, 11:40 AM

The numbers "look" reasonable for a Gen 3 3400, can't speak to a 3.4.

And as far as boost is concerned, not many (if at all) have achieved much over 11-12 PSI (over 1 bar).

**TurboZ24** · 02-13-2006, 11:53 AM

Does anyone here have any input on this for me like what are you all doing for an intake and turbo manifolds for example?

You can take a look at the pics on my website. Usually shortly headers are more than acceptable for a turbo setup. I do have the Camaro intake manifold on mine in combo with an L98 throttlebody.

Any comments on what i have found anyhep you can provide for rods pisons bearing and rings all forged?

Stock rod should be fine as long as you don't got for massive HP or extreme RPM. You can still swap in the SBC Rods. Crower was one of the only companies I contacted willing too do all the machine changes too a stock SBC rod in house. As for pistons, I'd say 10-14 psi range is all you can really safely push on the hyperutectic pistons. Some people may be pushing more, but I personally wouldn't.

and why would i want/need a forged crank?

The stock cast crank isn't going too fail, period. The only reason too use a forged crank would be if you wanted too increase the stroke, then you can take a 3500 crank and modify it too fit the 3.1/3.4.

**vega** · 02-13-2006, 12:30 PM

i thought so about the crank.. i am planning on pushing like 20 psi with a t61 turbo so i will need rods bearings rings seals and pistons done from my recolection of honda motors - i am not sure how things work with the GM motors but i know hondas need all that crap to handle it and they are engines just like any other so i am going ot make the assumtion that for 20 psi of boost which is going to be lots of power to be throwing out when using a t61 turbo (from my understanding that is). I personally don't think the stock 3.4 can handle 400hp or so on stock bottem end (reliably for prolonged periods of time with out blowing up)

i mean if 5 psi is pushing out 290 HP already that is onyl 5 psi. think of 20? if i did my math right in correlation to the t3 t4 setup he had if he was not lieing about the 290 hp then it should be in the past 400hp range with 20 psi. with this torquey motor tq should be up in the 400s. and as i said i don' think the stock bottem end cna handle that.

**TurboGt** · 02-13-2006, 01:04 PM

Originally posted by vega

i thought so about the crank.. i am planning on pushing like 20 psi with a t61 turbo so i will need rods bearings rings seals and pistons done from my recolection of honda motors - i am not sure how things work with the GM motors but i know hondas need all that crap to handle it and they are engines just like any other so i am going ot make the assumtion that for 20 psi of boost which is going to be lots of power to be throwing out when using a t61 turbo (from my understanding that is). I personally don't think the stock 3.4 can handle 400hp or so on stock bottem end (reliably for prolonged periods of time with out blowing up)

TurboZ24 is running 20 psi of boost on his 3.1. The stock rods, and pistons will not hold this kind of boost for very long. Check out what TurboZ24 has done to his car (the link is in his sig) he has a very nice sight with all of the info on his engine. You will be looking at similar parts/mods if you want to push that kind of power.

**TurboZ24** · 02-13-2006, 01:20 PM

Once again, though. What car is this motor intended for? I assume it's something RWD, not a FWD. My car produced 310.2 wheel HP at just 7 psi, with some tuning issues still.

Your issue isn't untimately going too be with the motor, it's going too be with the drivetrain.

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