250 WHP Supernatural 3.4 Build (Page 39/47)
lou_dias DEC 20, 11:17 AM

quote
Originally posted by m0sh_man:

with this much skill pulling power out of the iron 60* v6 engine, i'd love to see you build a northstar v8 for your racing purposes, But i understand the northstar is atleast 100lbs heavier.

did i read something in your posts about having a 4.9L v8 in one of the fieros? i know those are supposed to be pretty light weight, but not high revving. (and they are iron head too)


I'm the one with a 4.9... It's OT for this thread. This is La Fiera's thread about his wonderful 3.4.
Having owned both for years - I've many times stated that a properly [re]built 3.4 is a better engine than a 4.9 and only 2.5 owners should consider the 4.9 swap.

[This message has been edited by lou_dias (edited 12-20-2019).]

Blacktree DEC 20, 11:55 AM

quote
Originally posted by lou_dias: I've many times stated that a properly [re]built 3.4 is a better engine than a 4.9 and only 2.5 owners should consider the 4.9 swap.


I like to call the 4.9 V8 the "Double Duke". It has roughly double the displacement, power, and torque. And it's just as fragile.
lou_dias DEC 20, 01:47 PM

quote
Originally posted by Blacktree:

I like to call the 4.9 V8 the "Double Duke". It has roughly double the displacement, power, and torque. And it's just as fragile.



That's exactly how it feels - like 2 dukes duct-taped together!
m0sh_man DEC 20, 03:03 PM
the 3.4L build here is very very impressive, I was the first forum member to get one of the truleo intakes on a 3.4L and my car was used for dyno testing, a bone stock 3.4L pushrod with no mods other than the truleo intake and 19# injectors, i pulled 143HP and 189ft/lbs at the wheels, seeing as this supernatural 3.4L is pulling well over double the wheel horsepower that i had on my car its extremely impressive.
La fiera DEC 20, 07:15 PM

quote
Originally posted by m0sh_man:

the 3.4L build here is very very impressive, I was the first forum member to get one of the truleo intakes on a 3.4L and my car was used for dyno testing, a bone stock 3.4L pushrod with no mods other than the truleo intake and 19# injectors, i pulled 143HP and 189ft/lbs at the wheels, seeing as this supernatural 3.4L is pulling well over double the wheel horsepower that i had on my car its extremely impressive.



I'm humbled by your words m0sh-man. Thank you for the encouragement and there's still more to come.
I can probably squize another 25-30WHP out of it. If i can make 325WHPwith this one I'll stop there and concentrate on the rest of the build and on the Supernatural 3.7.
Which by the way I have to raise my WHP goals to 350WHP. I will update that thread because that short block hardware has been re designed with a new approach.

I've built plenty of "one of" engines but this one is my favorite! It is compact and it packs a PUNCH!
Thanks for all of you that cheer me on, you keep me going when I feel like giving up!

[This message has been edited by La fiera (edited 12-20-2019).]

pmbrunelle DEC 20, 08:00 PM
Considering that the hp curve is more or less of a straight line, it seems like by revving even higher than 6000 RPM you could stay more in the meat of your powerband while actually driving the car.

Is this something you are expecting to try?
La fiera DEC 20, 09:21 PM

quote
Originally posted by pmbrunelle:

Considering that the hp curve is more or less of a straight line, it seems like by revving even higher than 6000 RPM you could stay more in the meat of your powerband while actually driving the car.

Is this something you are expecting to try?



Yes, that's the plan. But the reason why I limit the runs to 6000rpms is because I have all stock short block components.
Like you said, I can see the engine has more potencial at higher RPMs specially with this "electric moto"r like torque curve.
So the plan is to take what we learned from this 3.4 and apply it to the 3.7, more cubes and more revs.
The 3.7 cam is a bit bigger on the exhaust side to extend top end hp and that may affect the low end torque.
I might change other parameters on the cam to make up for the extra exhaust flow. We have to wait and see.
lou_dias DEC 22, 03:40 PM
That reminds me. I have to start prepping my next set of heads for my 3.5L build... My goal with that one is to use 5.8" or 5.9" rods so that it has no problem revving to 7500+ and I can stay in 2nd gear racing on the oval track.
La fiera DEC 22, 07:35 PM

quote
Originally posted by lou_dias:

That reminds me. I have to start prepping my next set of heads for my 3.5L build... My goal with that one is to use 5.8" or 5.9" rods so that it has no problem revving to 7500+ and I can stay in 2nd gear racing on the oval track.



I'm surprised you haven't installed that intake you got from me. Combined with your heads and the roller cam from WOT-TECH you want to get (since you look down on mechanical flat tappets ) It will boost your mid range and top end power tremendously.

lou_dias DEC 23, 09:13 AM

quote
Originally posted by La fiera:
I'm surprised you haven't installed that intake you got from me. Combined with your heads and the roller cam from WOT-TECH you want to get (since you look down on mechanical flat tappets ) It will boost your mid range and top end power tremendously.


I'm saving it for the 3.5 ... Probably put that in my red Formula...along with the WOT-Tech .510" cam ...
Right now I'm still on the 3.4 with .480" cam and ported Firebird intake.

Money has been tight for the past year but my 3-car garage is finally built.



This week I will finally be moving everything that belongs to a Fiero to the 2nd floor of my garage.

[This message has been edited by lou_dias (edited 12-23-2019).]