how to make a stock 4 cyl fiero fast (Page 9/20)
befarrer JAN 20, 12:19 PM
I have seen Dasher's car, and it does look like a stock 2.5L. I have never ridden in it, but I know he is not lying. The car sounds way different now too. Dasher posted his dyno results awhile ago, but no picture. I think it was 141HP @3300RPM and 150Torque wasnt it?

I am planning on building up a duke in the future. Mainly because I want to keep factory look, but with slightly better performance. All I was planning on doing is upgrading the cam, using flat top pistons, and adding a header. 90% of my driving is highway, and my 2.5L Auto has plenty of passing power. If I add a V6, all it will do is decrease my gas mileage, no difference will be noticed at 100KM/h because all the engine is doing is keeping the car at a constant speed. I do want to put a V8 in my 86 someday, just for looks and sound.

USFiero JAN 20, 01:00 PM
Soooo funny.... Not all kennedys are politicians just cause they are born into the family that way. No birth announcement has ever said ' Joe Smoe, mecahnic and automotive genius was born yesterday to Mr and Mrs Shmoe '. What car in the 70's had 400 hp? twin turbos on a Duke? There is nothing I could contribute to this thread that could be funnier except to bump it! This is all a joke? You are all kidding right? Thanks for going to all the trouble to make me laugh today!

[This message has been edited by USFiero (edited 01-20-2004).]

Wipe0ut JAN 20, 02:48 PM

quote
Originally posted by 88Fiero2M4:
Ya So yu Made your 4 Cylinder better by adding 4 cylinders. YA I bet you pass everything but a gas station.


I've seen 4.9L Fieros that get 30 mpg.. show me a 200 horsepower Duke that does that.
psychic_mechanic JAN 20, 03:02 PM
If you welded two mid 70's Trans Ams together, you'd have close to 400 hp. Eight wheels, but 400 hp.

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-Vinny

87 Fiero GT 202k miles on the 2.8, just waiting to have an excuse for a swap
94 Infiniti Q45t (wife's car: 278 hp, RWD & LSD , leather)

USFiero JAN 20, 03:49 PM
Just realised we let some nimrod hijack this thread without getting to important stuff. Mr portoff's claims have been challenged before and he has never been able to prove any of his claims, which are all the products of 'talking to' other people. http://www.fiero.nl/forum/Forum1/HTML/035319.html You'll find some of Dashers' buildup data there and here http://www.fiero.nl/forum/Forum1/HTML/032319.html too. Things I'd like to know and have someone theorize on... I had heard the 300 cfm throttle body Holley made as an upgrade on the Fiero was inspired by the development on the ACTUAL Indy pace car (not the production ones) So i guess there would actually be some potential (with an intake manifold to help) there? I seem to recall the potential of the Duke was really hurt by the cheap crankshaft becoming unstable above 5000 RPM but that mercruiser cranks are good for more. Were the piston rods also cheap (hence the fires of early versions?) Can I use the same journals with ARP bolts or will they need reenforcement? Can i use roller rockers? What about the thread that asserted the duke is made of smallblock chevy V8 parts (an economy of manufacturing thing on GM's part?) so can i use rods, journals/bearings/pistons etc. etc etc...? see: http://www.fiero.nl/forum/Forum2/HTML/039386.html maybe a lot of modest performance parts would strengthen the internals? Bore or no bore? I looked for the thread 'big bad duke buildup' but the search feature won't reference 'bad' <EDIT> FOUND IT: http://www.fiero.nl/forum/Forum2/HTML/023474.html . I did find these: http://www.fiero.nl/forum/Forum2/HTML/037028.html Ira's Duke site: http://ironduke7.tripod.com/IronDuke.htm and a Duke owner's group: http://autos.groups.yahoo.com/group/akxsironduketech4garage/

Oh, and i drive a 95 Thunderbird V8. They are all autos. And there is NO WAY to get that to beat a V8 Mustang with just a chip, filter, exhaust and underdrive pulleys...hahahaha!!! It's a 4.6 sohc dude!

[This message has been edited by USFiero (edited 01-20-2004).]

88_Fiero_2M4 JAN 20, 04:47 PM
I havent been able to prove my clames as of yet cause I durring the winter months make less then min Wages. I dont have the cash right now, When I do I will try to prove what I claim. So far I have been just trying to keep my 88 running as it is throwing a 13 and a 33 so its not running the greatest right now. You dont just take a engine that is running like crap and just throw parts into it.... that will solve nothing but make rough running worse. And being that I am not making much now I dont have the spare cash to do any modifications. Second I dont have the engine yet, I have had plans to buy a Duke with only 6000 miles on it wich I have found one. I just dont have the cash and when I get close to having enuf something else goes wrong.

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Don Pottorff
Red 88 2M4
Silver 86 2M4

Tugboat JAN 20, 05:57 PM
Awwwwww.....
dasher JAN 20, 06:35 PM
WOW A FLAME WAR OVER THE DUKE. i never thaught i would ever be in the middle of one. well whatever. what i dont understand is i was not bragging or saying that what i did was the only or best why to go about getting power out of a 4 cyl. my reason for posting or even being a part of the PFF is to give and recive infomation. i have from day one told everyone everything i know about what has been done to my little duke. when i built the engine i was hoping for 180hp thinking that with the higher compression and better air flow i could pull so very big hp numbers. i found that i make good power but nothing to get excited about. when i can scan the dyno slips i will i just need to drive across the city to do it, so relax the will be posted soon enuff. as for the photoshop blast form slammedfiero, what is that all about? whats your beef? i have done nothing to merit that kinda blast. honestly what the F*<k.

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86 coupe 3.0L P&P shaved, 4 cyl 5 speed
full Body kit ASA Rims
hood and light mods

88_Fiero_2M4 JAN 20, 09:19 PM

quote
Originally posted by dasher:

slam you dont know **** so screw off. do cut what you don't know and why is there anything wrong with the photo shop it's my sig. what is your beef i was on your side? i have the dyno slip i just need to get them scan them. not photoshopped and fyi i dont have a single blot on. i get my power the hard N/A. please man chill


I really think its just he feels threatened that someone at least wants to make some hp with a duke. I dont understand why people here have to attack people who want to stick with the duke. Granted I may have over estimated what Hp it may make.... but I havent yet seen proof that it wont make that much hp. I base my figures on what kind of Hp increase a V8 will make with those mods then I cut it in half as in it being a 4 cylinder. I say So what if I am wrong..... At least I am willing to try.

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Don Pottorff
Red 88 2M4
Silver 86 2M4

Slammed Fiero JAN 20, 10:44 PM

quote
Originally posted by 88_Fiero_2M4:


I really think its just he feels threatened that someone at least wants to make some hp with a duke. I dont understand why people here have to attack people who want to stick with the duke. Granted I may have over estimated what Hp it may make.... but I havent yet seen proof that it wont make that much hp. I base my figures on what kind of Hp increase a V8 will make with those mods then I cut it in half as in it being a 4 cylinder. I say So what if I am wrong..... At least I am willing to try.


You base your HP claims on what the modifications will do on a different motor. Not a very scientific manner (or accurate) way of gathering data. Im just tired of people """CLAIMING"" hp #'s with nothing to back it up with.. Also a few things stand out that shoot your theroies to hell.

# 1.. a well built 3.4 made 135 hp @ the wheels , with a 15% driveline loss that is just shy of 160hp @ the flywheel.
# 2 Shaun Hammits dyno proven (I will post slips tomorrow) 2.8 with a 75 SHOT OF NITROUS made just over 200hp @ the flywheel. So BS-ing and saying taking off a belt here , acam there and getting rid of the cat will yield 200hp is just that...a load of Bull.

Threatened... Don't know sh1t..ahh ok...

I just don't shoot off inaccurate claims with no real evidence to back it up. You don't even have 1/4 mile #'s to crudley guesstimate from....you just guess from what other engines have done and what your uncle larry has told you.

JM