Did my testing and the dual pulley is interesting but not my cup...

Because of the terrific ratio of about 3:1 the boost gets up real fast. With my intake and stuff I hit 20 PSIG with the 178 Pulley. THis is at the local ambient of 45 to 25 F. I have not taken note of the higher ambient readings, but I feel that it would not change much. No heat issues due to my Super cooler and the LOW ASP temperatures, one less variable today.

I ran with the data logger and you can see the results. What you cant see is more intriguing by far. My boost peaked once at 25 but the belt with my improved wrap on the code 3 could not hold the load and slipped audibly. The low rev power was unique but uncontrollable, went sideways in 2nd from a 4000 rpm "ROLL". Boost drove my fuel pressure to 85 psig several times and the motor went Richie rich, again was hitting 25 PSIG boost.

THe takeoff and run up with partial throttle was crisp and powerful, but full in on the throttle was causing great tire slippage, tranny trying to upshift due to revs in 1 and 2 soo fast. Not an enjoyable ride. Boost did make it go but I do not feel that this is the best use of my limited research time.

I feel that the COde 3 is a great hot little number, lots of pluck and limited distress to the accessories and pulleys, no over speeding issues. Glad I got one for the last 1000miles.

The 178 pulley is great as it gives me lots of power and a generally good balance of boost and response. More power than the Code 3 and what I would call the second tier of power; from boost multipliers.

I had a 181 Pulley for a while and it was good, more audible than the 178 and at one point viewed by a fellow autocrosser as " your car is an animal". Tier three and a great way to get a bit more.

Having said all that I feel that if I can obtain a 185 Pulley system, then I will get it for peak power. That is just on the upper edge of the belt speed limits of pulleys and a good place for me.

The stacked pulley is great for below 4000 rpm power if you are in third gear or higher and dont down shift, or else - - -you may be handed more than you asked for. Power is enormous but wiggy and uneven what with tires spinning, TC kicking in, tranny shifting, and the BIG F/A concerns. AUUUGH no thanks, had to see it, done it, knew enough to put it back.

Be careful of what you ask , you may get it.

Note the boost I got at LESS than 4000 rpm. Be Happy

Woody

 

Where's the beef?

I mean the data?

 

Woody, all this effort is not in vain - one thing this means:

These engines, drivetrains and driveshafts are tough. 25psi on flakey AFRs without breaking anything? I would have assumed you would have tossed a piston or a a cylinder sleeve.

Same with MD-SRT or whoever pumping 150 shots into the engine + 16+ psi boost.

You know what this means. The NA and SRT engines both have many years of glorious power boosting ahead of them (Because there's not much different between the two...)

 

Camera will not load, working, Woody

 

Sorry to hear you didn't like the results but what type of tire were you on? I know code3 is suposed to working on some kind of belt wrap solution for stacked pulleys so hopefully they can figure it out, because it sounds like you have experienced the kind of gains most of us are craving. Thanks for all your time and effort I'm sure someone will pursue this further now that you have given the inspiration.

 

Belt slipping is a function to the load on the belt and the surface in contact with the pulley. I was asking so much of the belt as the boost at 25 PSIG is way over the load at say 18 PGIG. The effort goes up like the cube of the boost pressure, its enormous loading to expect.

I was on the original street tires, but the power was phenominal and Iam glad that I made it back with all the large pieces attached.

Enjoy, Woody

 

As always, interesting stuff there Sir Woody.

 

As mentioned by someone else, you could maybe add a manual boost controller inline with boost line going to the fuel regulator to keep it from going extreme rich? Look forward to your recent data log. Oh and my stock tires couldn't even keep straight when I was stock so don't let that stop you.

 

Hey woody,

Sorry you didn't like the combo. I however would like to test w/ the C3. Will you be willing to sell it to me?

 

Boost mod 1.00:

yes a 1/4" line to the regulator center fitting and to the manifold,


This first step, is crude and Iam ordering components to allow my data logger to output a signal controlled by the F/A value. I hope to use this signal to modulate pressure to the fuel regulator and thus control the rail pressure DYNAMICALLY. Should be interesting, BUT ordering things takes LONG TIME BOOM BOOM and my activities will be stalled till then. PUN intended.

When I get the parts, I plan to control the boost air pressure to the regulator by switching on and off the boost pressure line. Thus adjusting the average pressure in accord with the F/A value I select.

PS It shows that the injectors with a constant 60psig fuel pressure DIFFERENTIAL can flow all the fuel we need for a CRAZY stacked pulley setup.

I sent you another PM re boost number.

Woody
Photos tomorrow, camera got set to TIFF format, by error......

 

Woody - interesting info; thanks for sharing!!

Maybe consider the C3P "mid-sized" S/C pulley? Allegedly, they were working on an option for larger-crank-pullied cars... size-wise, between the C3P S/C pulley currently on the market, and the stock S/C pulley. This could give you the boost level you're looking for, without overdriving the accessories as much as the 185mm crank pulley set-up (i.e. fewer parasitic losses). OTOH, 185mm is obviously more proven than a currently "vaporware" mid-sized S/C pulley - so that might steer you back to the 185; food for thought...

Thanks again for sharing your findings - I have a feeling your R&D is going to help A LOT of folks who're having high-rpm lean issues (who wouldn't have fixed it otherwise)... kudos to you, sir!

 

That’s too bad, Woody. I’m kinda resigned to being satisfied with its current output.

 

check code3 website under the pulley for the c32/srt6....there is info about stacked pulleys

 

Wow, another fine job by WoodY! I know with the colder air, tires are spinning way to easy just with simple bolt-ons and probably stock too. Can't imagine adding all that extra power while the roads and tires are cooler. Keep up the great work keeping all us viewers intrigued.

 

Stacking pulleys has a negative side too, be warned,Woody

http://www.youtube.com/watch?v=PRtymuRMZiE

 

Looking at tighed1's avatar, he may have to worry about this too!