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Any noticeable difference....2.5 to 3.4L????? by knarfluna
Started on: 11-17-2014 06:19 PM
Replies: 20 (445 views)
Last post by: project34 on 11-21-2014 12:05 PM
knarfluna
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Report this Post11-17-2014 06:19 PM Click Here to See the Profile for knarflunaClick Here to Email knarflunaSend a Private Message to knarflunaEdit/Delete MessageReply w/QuoteDirect Link to This Post
was chatting with a mechanic the other day, and I suggested possibly doing a swap.....he totally talked me out of it...main reason....I wouldn't see much of a difference between my 2.5 and a 3.4.....HMmmmmm

What are your thoughts???


just seemed odd to here that...
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Grantman
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Report this Post11-17-2014 06:35 PM Click Here to See the Profile for GrantmanClick Here to Email GrantmanSend a Private Message to GrantmanEdit/Delete MessageReply w/QuoteDirect Link to This Post
Big difference between 2.5 and 3.4, still noticeable between 2.8 and 3.4.
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Patrick
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Report this Post11-17-2014 06:48 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post

He's obviously not the least bit familiar with these engines.
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Raydar
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Report this Post11-17-2014 07:07 PM Click Here to See the Profile for RaydarClick Here to Email RaydarSend a Private Message to RaydarEdit/Delete MessageReply w/QuoteDirect Link to This Post
There's a drastic difference between a 2.5 and a 2.8. There is almost that much more difference between a 2.8 and a 3.4.
Your mechanic has rocks in his head.
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DKcustoms
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Report this Post11-17-2014 07:13 PM Click Here to See the Profile for DKcustomsSend a Private Message to DKcustomsEdit/Delete MessageReply w/QuoteDirect Link to This Post
I think the first thing you need to do is find a different mechanic for your regular maintenance.

Second thing is to find someone who specifically does Fieros near you
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zzzhuh
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Report this Post11-17-2014 10:05 PM Click Here to See the Profile for zzzhuhSend a Private Message to zzzhuhEdit/Delete MessageReply w/QuoteDirect Link to This Post
Like everyone else said, you can tell the difference with ease.
Here are the specs:

2.5L Iron Duke:
Power 98 hp @ 4,800 RPM
Torque 135 lb-ft @ 3,200 RPM

2.8L V6:
Power 135 hp @ 4,500 RPM
Torque 165 lb-ft @ 3,600 RPM

3.4L V6:
Power 160HP @ 4,600 RPM
Torque 200 lb-ft @ 3,600 RPM

Obviously, by the time any of these engines hit the ground your going to loose some power. People claim that a brand new 2.8L V6 is only pushing out around 115HP to the wheels.

------------------
Every fiero has a story, It's our job to keep that story alive.

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Patrick
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Report this Post11-17-2014 10:19 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by zzzhuh:

2.5L Iron Duke:
Power 98 hp @ 4,800 RPM
Torque 135 lb-ft @ 3,200 RPM


Was that with a protein supplement? No way the '84 had 98 HP.
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Neils88
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Report this Post11-17-2014 11:17 PM Click Here to See the Profile for Neils88Click Here to Email Neils88Send a Private Message to Neils88Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Patrick:

Was that with a protein supplement? No way the '84 had 98 HP.


87/88 with DIS had 98hp
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no2pencil
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Report this Post11-17-2014 11:33 PM Click Here to See the Profile for no2pencilClick Here to Email no2pencilSend a Private Message to no2pencilEdit/Delete MessageReply w/QuoteDirect Link to This Post
We upgraded my 2.5 auto to a 3.4L 5 speed. It's a different car.
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Patrick
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Report this Post11-17-2014 11:57 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by no2pencil:

We upgraded my 2.5 auto to a 3.4L 5 speed. It's a different car.


Just going from an auto to a 5-spd would've given your Fiero a good kick in the pants, but I'm sure the engine swap helped as well.

 
quote
Originally posted by Neils88:

87/88 with DIS had 98hp


That doesn't do a thing for my '84.

[This message has been edited by Patrick (edited 11-18-2014).]

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pontiackid86
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Report this Post11-18-2014 03:45 AM Click Here to See the Profile for pontiackid86Click Here to Email pontiackid86Send a Private Message to pontiackid86Edit/Delete MessageReply w/QuoteDirect Link to This Post
yea.... I would find a new mechanic

I had a 3.4 SFI turbo charged formula and it was the most fun I've ever had with cloths on.

[This message has been edited by pontiackid86 (edited 11-18-2014).]

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Ang84Indy
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Report this Post11-18-2014 05:19 AM Click Here to See the Profile for Ang84IndySend a Private Message to Ang84IndyEdit/Delete MessageReply w/QuoteDirect Link to This Post
Good mechanics are hard to find... If you trust him, keep him. It seems to me that he doesn't want to do the swap and wants to talk you out of it. That is no reason to drop him, just find someone else to do the swap.
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josef644
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Report this Post11-18-2014 06:57 PM Click Here to See the Profile for josef644Click Here to Email josef644Send a Private Message to josef644Edit/Delete MessageReply w/QuoteDirect Link to This Post
I had an 86 w/ 2.5 and a 5 speed. I have an 88 automatic now. Hugh difference.
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zzzhuh
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Report this Post11-18-2014 07:55 PM Click Here to See the Profile for zzzhuhSend a Private Message to zzzhuhEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Patrick:

Was that with a protein supplement? No way the '84 had 98 HP.


84 didn't, 87-88 did.

84' specs:

Power 92 hp @ 4,000 RPM
Torque 132 lb-ft @ 2,800 RPM
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Neils88
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Report this Post11-18-2014 08:18 PM Click Here to See the Profile for Neils88Click Here to Email Neils88Send a Private Message to Neils88Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Patrick:

That doesn't do a thing for my '84.



Paint it red...that's good for at least 15 hp....a few added stickers should drop you into the high 12's
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tshark
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Report this Post11-18-2014 08:45 PM Click Here to See the Profile for tsharkSend a Private Message to tsharkEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Neils88:


Paint it red...that's good for at least 15 hp....a few added stickers should drop you into the high 12's


Ha. Then add a wing, a can, and an obnoxious radio.
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Patrick
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Report this Post11-18-2014 11:01 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by zzzhuh:

84' specs:

Power 92 hp @ 4,000 RPM
Torque 132 lb-ft @ 2,800 RPM


I autocrossed my 5-spd '84 Fiero for four years. Other drivers with newer, much more powerful cars would refuse to believe that my Fiero had about 90 horsepower (probably less), especially after the Mighty Duke had just beaten them around the course.

I drive a 5-spd '88 Formula (2.8) at autocross now, but... a 3.4 would sure make my '84 scoot around the track.

[This message has been edited by Patrick (edited 11-19-2014).]

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Csjag
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Report this Post11-19-2014 07:07 AM Click Here to See the Profile for CsjagClick Here to Email CsjagSend a Private Message to CsjagEdit/Delete MessageReply w/QuoteDirect Link to This Post
I don't think that the 0 to 30 time is too much different, especially comparing a manual to a manual trans.
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Patrick
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Report this Post11-19-2014 01:58 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Csjag:

I don't think that the 0 to 30 time is too much different, especially comparing a manual to a manual trans.


No way.

My 5-spd 2.8 Formula is much quicker than my 5-spd 2.5 '84, and my '84 runs very well. A 3.4 would be quicker yet.
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thesameguy
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Report this Post11-19-2014 02:25 PM Click Here to See the Profile for thesameguyClick Here to Email thesameguySend a Private Message to thesameguyEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Csjag:

I don't think that the 0 to 30 time is too much different, especially comparing a manual to a manual trans.


Between a 2.5 and a 3.4? Between 135lb ft and 200lb ft? Huge difference. One of the best things about the Fiero is all that weight over the back wheels - it can put a lot of power down very effectively. Every lb ft you've got counts in these cars. It's nothing short of amazing.
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project34
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Report this Post11-21-2014 12:05 PM Click Here to See the Profile for project34Send a Private Message to project34Edit/Delete MessageReply w/QuoteDirect Link to This Post
It's obvious to me that either your mechanic knows nothing about a 3.4L engine swap, or perhaps he simply just does not want to do one for you.

For either reason, I strongly suggest NOT insisting on a 3.4L engine swap from him.

Why?

I knew an intelligent guy who specialized in swapping out brand-new engines from brand-new Mustangs, for example, that were engine swaps a whole pile more powerful and complicated than the simple 3.4L engine swap I sought for my Fiero.

This gentleman flat out refused to work on my 3.4L engine swap project, so I asked him, "Why not?"

His response to me was very straightforward. He said, "Unlike you, my Mustang customer base doesn't give a damn if their cars don't start or run reliably when the outside temperature drops to below freezing, because they just store their cars then, anyway. You, on the other hand, probably prefer your Fiero to start and run reliably even at fifteen degrees below zero, right?"

"Yes", I replied, and then promptly took my Fiero someplace else more nearby, per the recommendations of several engineers at work.

That 3.4L engine swap was completed nearly eight years ago, on New Year's Eve of 2006.

And yes, that 3.4L engine swap stil starts and runs reliably even at fifteen degrees below zero (-15oF = -26oC).
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