OK someone sat me down and explained this all to me.. I got most of it but the rest i didnt understand.. I got the most important part though: its better to have less boost and more timing then more boost and less timing to make more power.. SOOOO im going to try some different pulley combos.. I currently have the 6.66 crank pulley, I want to make about 10PSI of boost 11 maybe MAX.. for now! so what blower pulley should i go with? This will also be easier on my fuel system and my injectors may handle this. With the 2.75 blower pulley I was expecting about 14PSI of boost.. It looks like the way it goes that I would need the 2.95 blower pulley to see about 11PSI.. That seems good on a 9:1 compression 359 motor right? RSKraus wanna help out a bit?? What does the stock 3.33 blower pulley and the 6.66 crank pulley show? How much power am I looking at? The motor itself should make about 350-400 rear wheel.. Its all forged and has a lightweight flywheel, aswell as ported heads and matching intake.. Im hoping that the motor would put down about 370-380 and adding the 11 PSI of boost and doing the math I should see about 600 RWHP including the loss of hp that the SC takes to run.. I did this figuring on a good tune that I would make about 20-25HP per pound of boost.. Seems right to me.. then again im new to FI.. Help please.

 

Just went in my garage and was sitting there trying to decide what to do.. I guess i just decided to spin the pulley as im looking at it and it seems to have alot of resistance.. maybe about 3 to 5 pounds of resistance.. it spins freely and smooth.. just seems like it has some resistance to it.. is this normal?

 

A little resistance is to be expected, you're turning a set of gears and an impeller. If your heads have been ported then you're going to lose some boost on the gauge. You can probably pulley it for 14, but you may only see 11-12 if the heads are any good. Honestly with that much boost you need to look into some sort of cooling setup for the intake charge. Intercooler, aftercooler, methanol injection... something to get those intake temps down.

 

6.66/2.75 on that combo would make 14 psi. 6.66/3.33 would be around 8 psi.

BOOST FED 95Z, I'm betting your friend with 21 psi and 9.5/1 was running race gas. If not, he's retarding his timing. If he's retarding the timing, it's reducing the power. It's that simple. I've gained 50 rwhp by going from 16 deg to 20 deg. Now, with less compression and an intercooler, I'm using 35 deg.

If the tune is mail-order from PCMforLess, it will not be right on a combo such as this. Plan on spending time tuning it yourself. And if it's tuned properly, the timing will be low to avoid detonation, thus reducing power output.

Mike

 

high boost + no intercooler + inadequate fuel system + mail order tuning = kaboom.

 

I agree with GOT HP.

Also, don't count on 20 - 25 hp/psi boost. I'm only seeing about 15 hp/psi with an intercooler. No intercooler will drop that to 10 - 12 hp/psi, so 15 psi might add 160 rwhp. 160 + 370 = 520 rwhp

Mike

 

OK, Just for my street car. I want to have about 530-560 rear wheel maybe a bit more if i can and be able to beat on it ALL THE TIME.. lol.. I want it to be reliable aswell. Thats what i WANT to do and this is what I have.. A vortech T tirm woth a 6.66 crank pulley and the blower pullies i have are 3.33 and 2.75 i suppose i could get a bigger one then 2.75 maybe 2.85?, T rex boost pump, 42LB injectors, crane ignition with boost retard, autolite 103 plugs.. the heads are trick flow heads with 64cc combustion chambers.. the block has blower pistons and its all forged, compression is 8.5:1. cam is 224/236 .536/.555 114LSA.. The car is an M6 with a stage 4 clutch and steel flywheel, if it matters.. What are you opinions on what i should do?? Please go the extra mile and make a long response so im not confused.. thanks.. Im really confused about this.. I dont know either if I should run methanol or an intercooler, nor what size intercooler to get if i go that way.. motor SHOULD be done by the end of the week, maybe next week..

 

id say do the following:

get a big in tank fuel pump (is the trex capable of supporting the power he wants?)

get an intercooler for the vortech

get dyno tuning (not mail order)

 

Im getting it dyno tuned.. the mail order was just to get it running ok for the motor to break in and be able to drive.. i figured why not since i have the unlimited Email tune pkg.. I have had it for like 2 years.. Figured it would be better then the stock tune.. Im going with a walboro 255 in the near future... And as for the intercooler i cant find a good air to air one that will fit, i dont know the size to get.. can I run and inter cooler infront of my radiator? would that cause adverse affects on coolant? where should i get one? I found one made for a gen2 eclipes, it is a corner mount and would fit nicely under the dust cover but its way to small i would think.. I dont know anygood brands either...

 

Get the Vortech Aftercooler kit.

I tried using a Walbro 255 in the tank plus the T-rex and they wouldn't support 550 rwhp.

Mike

 

What do you suggest?

 

I'm using 2 Walbro 255's in the tank, one of them boost-triggered. Others have been able to use a single 255 with a Kenne-Bell Boost-A-Pump. You might even try using a single 255, just be sure to check full-boost fuel pressure.

Mike