Full Song

So Cal Mark · Post by **So Cal Mark** » Fri Jun 24, 2011 3:34 pm

nice melody, but no lyrics?

baltobernie · Post by **baltobernie** » Fri Jun 24, 2011 3:57 pm

boogiedude · Post by **boogiedude** » Fri Jun 24, 2011 6:43 pm

Pretty good numbers. What have you done to the engine?

So Cal Mark · Post by **So Cal Mark** » Sat Jun 25, 2011 12:36 am

the torque curve seems very peaky, why do you feel it drops off so dramatically?

baltobernie · Post by **baltobernie** » Sat Jun 25, 2011 10:50 am

boogiedude wrote:Pretty good numbers. What have you done to the engine?

Thanks. Engine details are in the middle of this thread http://www.fiatspider.com/f08/viewtopic.php?f=17&t=5989 I've been experimenting with different jetting to clean up the idle and make more power down low.

So Cal Mark wrote:the torque curve seems very peaky, why do you feel it drops off so dramatically?

Did you mean to say "horsepower"? Yeah, she really runs out of breath at high RPM. The data could have been presented in a more flattering picture, 'cause really, 90 RWHP at 2500 is very streetable.

We've got good A/F ratio throughout, but the tuner suggested that I look for an aftermarket progressive linkage for this carb. I must use restraint with the throttle below 3k to keep from bogging down the engine. I suppose those of you with twin IDFs are in the same predicament. We'll see what Denise has to say after a spin in Nashville.

So Cal Mark · Post by **So Cal Mark** » Sat Jun 25, 2011 10:59 am

Since the two lines are the same color I wasn't sure what I was seeing. 90 hp at 2500 is good and 105 at 4000 also, but that motor would normally make peak hp at about 6000-6200 rpm. The steep dropoff indicates something amiss. Are you using adjustable cam wheels?

baltobernie · Post by **baltobernie** » Sat Jun 25, 2011 11:47 am

Yes, and the valve train was timed to IAP cam specs. I wonder if they've moved?

This curve looks a lot different than the 2009 posted in the New Head thread. Damn, I shoulda marked them with a paint pen or scribed a line

Actually, I kinda like the power where it is, right where I spend most of my driving. Oh boy, another wintertime project

124ADDHE · Post by **124ADDHE** » Sat Jun 25, 2011 12:02 pm

It looks like 30 hp @ 2500 rpm to me, 90 doesnt make sense, I think thats the torque.

baltobernie · Post by **baltobernie** » Sat Jun 25, 2011 3:36 pm

That's because you're, uh, Canadian

Whew! Another wintertime project crossed off the list! Thanks!

124ADDHE · Post by **124ADDHE** » Sat Jun 25, 2011 4:12 pm

Your HP will be the lower, linear path, steadily increasing until the peak hp is realised, on the stock 1800 it is, as indicated, it is @ 6200 rpm, the figure of 90 @ 2500 is definately your torque. I am guessing that if you have such a great torque curve, your hp peaks low, especially all cammed out, and your a/f ratio is good then it must be your exhaust system!

Never does a torque curve on a NA gas engine peak after the hp.....

mdrburchette · Post by **mdrburchette** » Sun Jul 03, 2011 7:47 am

Dang, I have got to get my engine dynoed with the dual IDFs on it. I'm anxious to see what I gained in hp over the 2 bbl Holley.
Bernie, I'd be honored to offer my butt dyno for comparison!

baltobernie · Post by **baltobernie** » Mon Jul 04, 2011 11:40 am

Bring your booster seat to FFO! I've not yet driven a new 500, and I'm sure Debbie would appreciate a stint in an air-conditioned car.

mdrburchette · Post by **mdrburchette** » Mon Jul 04, 2011 3:12 pm

You got it, Bernie. I'll be there, booster seat and all!

Daniel · Post by **Daniel** » Sat Jul 09, 2011 6:13 pm

Bernie

Is this the Same Engine you were comparing to Alvon's engine on on another post ?

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