my disappointing dyno!

[schwett]

it's not awful, but it's not what i was hoping for. anyone have any ideas about the odd dip before it goes to the bigger cam lobes? i assume if i lower the crossover with a vpac or similar, it will go away.



sorry again, this isn't an integra - it's a completely stock (before the JRSC) 2000 Prelude SH. i have made some changes since this dyno, plugs, intake, timing, fuel pressure, but they didn't give me any gains. i think some tuning is in order, but there ain't a whole lot to tune! any comments would be appreciated. i've got gauges coming in tomorrow, so that might shed some light on things for me.

[schwett]

well, i wasn't expecting 235whp. i was hoping to hit 210 bone stock with the kit. that would represent an increase of 160 -> 210, or a bit over 30%. 160 -> 200 is admittedly close, but it seems like 40whp from 6psi of boost is on the weak side. i am pretty sure the fuel pressure is wacked, so that will be my first stop after the gauges come in.

[Sonnyballs]

Judging by the way the torque falls off so quickly at 6000+, it looks like it is running very rich up there. Do you have an a/f printout?

Sonny


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Sonny Van Hook ([email protected])
2000 JRSC'd Civic Si @ 6psi (Powered by Hondata)
1999 Tonykart/Honda 80cc Shifter

[schwett]

they did the run with a/f, but it's not printed. i'll get it from them next time i'm down there....

here's an interesting comparison : the red line is a jackson dyno with just intake, the green line is iranman from preludeonline.com (also just intake) and the blue line is mine (stock). given the similarities of red and green, i would've thought INTAKE would be the answer. however, putting on an intake did NOT help me... at least not yet. the ORANGE line is a 7psi turbo, dyno'd on the same dyno as my jrsc lude.



[This message has been edited by schwett (edited August 16, 2001).]

[UberLude]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by schwett:
they did the run with a/f, but it's not printed. i'll get it from them next time i'm down there....

here's an interesting comparison : the red line is a jackson dyno with just intake, the green line is iranman from preludeonline.com (also just intake) and the blue line is mine (stock). given the similarities of red and green, i would've thought INTAKE would be the answer. however, putting on an intake did NOT help me... at least not yet. the ORANGE line is a 7psi turbo, dyno'd on the same dyno as my jrsc lude.



[This message has been edited by schwett (edited August 16, 2001).]<HR></BLOCKQUOTE>

Don't forget the jackson dyno was done on race fuel. Oscar admitted that when he was backed against the wall about the results.

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99 Prelude SH
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The world isn't run by weapons anymore, or energy, or money. It's run by little ones and zeros, little bits of data---it's all just electrons.

[schwett]

NO KIDDING??? I didn't know that. Are you sure that applies to this particular dyno? On race gas, they probably could've advanced the BTC all the way.

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by UberLude:
Don't forget the jackson dyno was done on race fuel. Oscar admitted that when he was backed against the wall about the results.

<HR></BLOCKQUOTE>

[zip]

From the dyno, it looks as if your setup is also suffering from the 6200+rpm fuel dump that Si's and ITR's suffer from as Sonny mentioned.

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Mods

[reddelsol]

Well, I wish I had 171lbs of torque myself!

I'm sure someone will be along to diagnose, but it's almost always a too rich fuel issue (along with some timing adjustments, and maybe belt adjustment).

I don't think I've seen anyone start out too lean, but haven't seen too many prelude charts around here.

The SC lude is supposed to put out around 235HP or so, I think. Can't remember.

[davidm_sh]

Just for some reference:

take a look over at preludeonline.com. They have a few JR supercharged Preludes with dyno charts posted I believe. I don't know of anyone that has hit the claimed "238whp" but who knows...

[davidm_sh]

DOH! Sorry I just saw your post over there =). disregard my last post. But just to reply to your post over their. I think JR's famed 238whp was with aftermarket intake/headers/and exhaust system. Don't know how much of a difference that makes though.