Street Brawler 46 Trim Final - 392whp@24psi, w/Exhaust!

Q&A regarding engines, turbos, and intercoolers and power upgrades

Postby d1alltrac » Tue Mar 14, 2006 7:07 am

Denver_whiteST185 wrote:
Denver_whiteST185 wrote: also, do you have an unorthadox racing pully, cause i just bought one and it should give me about 10 extra horsepower.


personally i wouldn't remove my harmonic dampener for one of those pulleys


you don't remove anything except the stock pulley and replace it with the new pulley and new belts.


the harmonic dampener is part of the stock crank pulley
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Postby Denver_whiteST185 » Tue Mar 14, 2006 7:15 am

d1alltrac wrote:
Denver_whiteST185 wrote:
Denver_whiteST185 wrote: also, do you have an unorthadox racing pully, cause i just bought one and it should give me about 10 extra horsepower.


personally i wouldn't remove my harmonic dampener for one of those pulleys


you don't remove anything except the stock pulley and replace it with the new pulley and new belts.


the harmonic dampener is part of the stock crank pulley


Is there a dampener that i can put on to it or fabricate. i haven't recived the part yet, so i haven't installed it.
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(not really, i just own a completely UNmodified 91 civic dx that gets 45+ mpg now)
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Postby d1alltrac » Tue Mar 14, 2006 7:43 am

basically no, do a google search on it and read up...you may not consider it a big deal, its just not something i'd do. i have had friends use them with no ill effects actually.

David---with this turbo, does the power more...

A. hit hard as hell and stay like that, or
B. start pulling harder and harder and never stop, or
C. other
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Postby Maloy » Tue Mar 14, 2006 10:14 am

This whole underdrive pulley thing has been discussed a few times before. The harmonic balancer absorbs vibrations from your crankshaft, theoretically a perfectly balanced engine doesnt need one. The horror stories iv heard arent worth that 10 horse to me...
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Postby ___Scott___ » Tue Mar 14, 2006 4:57 pm

Maloy wrote:theoretically a perfectly balanced engine doesnt need one.

Not true.

The balance of the engine has nothing to do with crankshaft harmonics. The dampener is there for a very good reason, a reason that the UR people just can't seem to comprehend.
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Postby CodingParadox » Tue Mar 14, 2006 8:35 pm

d1alltrac wrote:basically no, do a google search on it and read up...you may not consider it a big deal, its just not something i'd do. i have had friends use them with no ill effects actually.

David---with this turbo, does the power more...

A. hit hard as hell and stay like that, or
B. start pulling harder and harder and never stop, or
C. other


Depends what gear you're in. In lower gears, the turbo hits hard as hell and then stays like that. It FULLY spools by 4700, but as soon as it starts spooling, the extra power pulls you through the rev range to full spool fast enough that it's pretty much just a smack in the ass.

In the upper gears, if you floor it lower down in the RPM range, it takes a while to spool, but that's to be expected.
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Postby Maloy » Tue Mar 14, 2006 9:14 pm

so what is the harmonic dampener for then?
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Postby CodingParadox » Tue Mar 14, 2006 9:40 pm

It dampens the accessory drive systems and belts from vibration. A balanced engine still has vibrations, it just keeps the crank from wobbling.
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Postby ruffneck » Tue Mar 14, 2006 9:43 pm

so what is the harmonic dampener for then?
to balance vibrations from the crankshaft, as stated (by you , I think?)
There is no such thing as a a perfectly balanced engine IMO. True you can get the bottom end balanced, but I believe thats done on a machine that spins at about 500rpm... running it at 8000rpm under full boost, I think you are going to get some vibration :P

I can't post the dyno graphs sorry, not allowed to post attachments here, but I could take a photo and email them to you if you would like? I think I recall you saying a while ago you had a set of 264 cams that you took out to regain bottom end? I would suggest putting just the intake cam back in, and retarding stock exhaust cam. If you already have the cam, it can't hurt to try...might be worth the couple hours of labour...
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Postby sleeper » Tue Mar 14, 2006 9:47 pm

what fuel pump are you using?
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Postby CodingParadox » Tue Mar 14, 2006 9:50 pm

Walbro HP 255lph fuel pump.

No, James had 264 cams that he pulled out to regain bottom end. We might try experimenting with different cams at some point soon.
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Postby sleeper » Tue Mar 14, 2006 9:58 pm

if you are using the walbro pump, you soon out of fuel!?!?
had you seen any signs of it maxing out?
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Postby ruffneck » Tue Mar 14, 2006 10:38 pm

if you are using the walbro pump, you soon out of fuel!?!?

why would you say that?
850cc injectors * 4 = 204 lph (at stock pressure)
Wlabro pump flows 255lph.
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Postby ___Scott___ » Tue Mar 14, 2006 10:43 pm

Maloy wrote:so what is the harmonic dampener for then?
To dampen harmonics :wink:

A little light reading is in order. Start here:
http://www.suprasonic.org/public_html/s ... amper.html
http://dinancars.com/whitepapersFile.asp?ID=5

From here: http://d-series.org/forums/printthread.php?t=7945
a wise old one warned me about using a lightweight pulley on a D16, I didn't listen........

What I get for being bull headed.........
http://www.bettendorf.com/~mrbone/pictu ... mainsx.jpg
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Postby sleeper » Tue Mar 14, 2006 10:57 pm

ruffneck wrote:
if you are using the walbro pump, you soon out of fuel!?!?

why would you say that?
850cc injectors * 4 = 204 lph (at stock pressure)
Wlabro pump flows 255lph.



that`s right! but remember that NO FPR can completly close! they lett thru 50-70lh to! so then you just have 205-185 left! (wolfcatz tested this!)
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