BBYSTWY

So I finally think all the kinks are worked out with my build and I have a question on boost numbers...we can over look the obvious that I'm running a fragile drive and getting the motor dialed in would be step one...however I don't want to spend all the time tuning and jetting for what I have just to have to do it all over again so please bear with me and offer what advice you can

Motor...454 bored .030 over, dart iron heads, stock crank, eagle rods, JE pistons(8.2:1 comp ratio) Dyers 8-71 blower, twin holley 850s, comp cam(don't have all the specs off hand but can get them if needed) its a hydraulic roller with roller rockers as well...

On to the question...

The few WOT runs I did on the boat netted 5 lbs. boost at WOT....is it worth uppping the boost a little to say 8 lbs?? My goal here is not an all out race boat but a quick "reliable" pleasure boat....is upping the boost a few lbs going to change anything speedwise?? is this going to be a 1 MPH change that's going to stress the crap out of the motor?? is it going to be worth 100 hp and 5 MPH?? just curious if its worth doing some pulley swapping to up the boost slightly and tune from there to do it once and be done....This will be run exclusively on 93 octane pump gas

Thanks

RBeyer

3lbs of boost is not going to increase HP by 100 maybe 25. 5 MPH unlikely maybe 2, I will let others share!

BBYSTWY

Yea I was exaggerating my point of course lol but ya know why stop there....is 10 lbs "safe"?? could I run double what I'm running now and still be as "reliable" as a performance boat could be excluding drive issues??

Crude Intentions

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BBYSTWY

So I guess in reality...a pulley swap being as cheap as it is would be worth it up to the 8ish lb range?? under a hundred bucks to maybe gain a MPH or 2 potentially?? I guess my biggest question is where would the cut off for "reliability" come into play?? the 8 lb range from what you're saying obviously??

BBYSTWY

To add to that...I kept the motor with low compression to keep some reliability on the table...with my setup would the 8 lbs vs the 5 lbs be any less reliable?? I mean I live in reality and obviously more boost is going to stress engine components and I do NOT want to run it on the ragged edge all the time but am I being too conservative at 5 lbs??

thanks

Griff

With 8.2 static, you probably do not want to go more than 7# of boost on 93 octane.
Ref chart http://documents.holley.com/techlibr..._tech_info.pdf

BBYSTWY

You always have to come in with technical real world bubble bursting data don't you griff hahahaha

Thanks for the info!! looks like 7 is about all I should do to keep it somewhat reliable

Crude Intentions

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cigrocket

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