Iron Vs. Aluminum, the Final say!

[Superdave]

engine speed is calculated from drum speed on most dynos.

The shop I go to refuses to use a spark pickup to calculate RPM, instead they assume 1:1 gearing and put in the final drive ratio. It makes for a skewed graph. My pulls were in 3rd which is 1.38:1, the .94:1 4th gear pulls were pretty similar power wise but 145MPH on the rollers with 30 people around watching isn't very safe.


I put my car on another local dyno when i first built it, they used a spark pickup and the graph was much better. The car was so lean with the stock fuel pump and pre-00 FPR that we never made a complete pull. iirc it was like 240WHP @ 4500 RPM with a 14:1 AFR.

[Guest]

I'm not sure on what goes on with a dyno, but if the dyno is seeing engine speed and roller speed, I imagine it could account for the difference.

Doesn't matter if the dyno can see engine RPM, the mechanical advantage is still there, and skews the results.

I spoke with a dyno opertator at length, after a friend of mine dynoed his 1100 HP Firebird. Applying different compensation formulas to the same run we had his car making anywhere between 500 HP and 1600 HP. lol Dynos are not a very good comparison tool, but it's the easiest thing we have currently. Personally I don't care what the dyno tells me, as long as I get a smile across my face when I press on the loud pedal, that's all I care about.

[robertisaar]

guys...... you're feeding the troll.

[ericjon262]

[Superdave]

guys...... you're feeding the troll.

It's fun.

[robertisaar]

i'm sure, i've been loosely following along, i'm just saying don't expect to bring enlightenment to those who do not want it.

[carbon]

LOL... I do try to direct people with real 60* questions over here as often as I can...

[caffeine]

Basically it seems his argument consists of "I made lots of power with iron heads" but the fact remains he could have made more with aluminum heads...

[ericjon262]

http://www.fiero.nl/forum/Forum2/HTML/127251.html

This has made it all worth it. The light has been seen!

[caffeine]

I've been assured these are actually wheel horsepower and wheel torque numbers. Stock everything except the y-pipe. And my tune needs work with a wideband .

Edit: the max torque number isn't specified on the sheet but my friend told me its 252 ft. lbs.

[Maple Leaf]

Upside down dude.. lol

BTW that is some craziness going on in that fiero forum! :P

[caffeine]

What can I say? Cell phone pics

[Maple Leaf]

What can I say? Cell phone pics

[ericjon262]

Upside down dude.. lol

BTW that is some craziness going on in that fiero forum! :P

I really wasn't going to reply after this

Originally posted by ericjon262:


see, this is exactly what I meant, I ask for real, hard evidence to back up your claims that the iron heads are better or that the roller cam is the power maker of the 3x00 and this is all you post.

the only things you post to back up your claims are a couple of oval track times, big whoop, driver skill and suspension will make more difference overall power anyways. and as I see you posted in your "build thread"(if you can call it that) you have a hopped up suspension too... then there's the dynograph that supports my arguement. oh, and bcampbell out torqued you and out horsepowered your built 3.4 with a stock 3500... oh wait, but that's not a fair comparison because he didn't use a stock malibu or G6 Y pipe...

you really show what you're made of here, you're one BMF aren't you, you and your built 3.4 that can't outperform a mostly stock 3500. everyone bow down to the almighty lou dias and his 3.4...


your dyno, max torque, 249 max power 187... again, you call me troll?

again, more data coming from the aluminum head crowd, and still no even somewhat scientific data to back up any of your claims. afterall, this forum is Technical Discussion & Questions... you have yet to post anything technical, just some quotes from 25+year old books that probably tell you to replace IAT sensors with resistors and that you can only tune the fuel curve via fuel pressure....

I'm just glad I haven't wasted my time as bad as I thought I was, at least one person has read this thread and seen the light...

I think there's another bridge to get where I'm going...

but damn, he is one dumb mother f****r...

[caffeine]

Thanks!