camuman

No the 1200 blower maxed out at 18-18.5 with a 8400 rev limit on my AP2 so you should see +1 psi on a AP1. this is with the stock SOS crank pulley and a 3.0" pulley
[/quote]


Unrelated. Makes my 14 psi look wek saus.

donaldmejr

No the 1200 blower maxed out at 18-18.5 with a 8400 rev limit on my AP2 so you should see +1 psi on a AP1. this is with the stock SOS crank pulley and a 3.0" pulley
[/quote]


Unrelated. Makes my 14 psi look wek saus.
[/quote]

lol NO!! im only what 70 whp and 30wtq over you...and I need race fuel to get there

Torque Obsessed

No the 1200 blower maxed out at 18-18.5 with a 8400 rev limit on my AP2 so you should see +1 psi on a AP1. this is with the stock SOS crank pulley and a 3.0" pulley
[/quote]

That makes perfect sense. But the 3.2" pulley barely hit 15.5psi on my AP1, and there's just no way a 3.0" is going to be 4psi higher... If anything, I'm seeing diminishing returns (smaller increases in boost pressure) as the pulleys get smaller. Here's my results so far:
3.8: 12.0psi
3.6: 14.4psi
3.2: 15.5psi

I can't explain it, and I'm not saying you're wrong. My car might not be normal... And I can't rule out the possibility that my BLV might be leaking a little bit of air without my knowledge. I think we need more people to dyno their cars so my results don't confuse everyone.

camuman

Weather and altitude will affect boost. I bet that's the big difference here.

donaldmejr

wheres he? I live in PA now

Torque Obsessed

I'm in Atlanta. 1,000ft above sea level, also running a HFC...

donaldmejr

Pittsburgh is 770 ft above....Me to Berk 70mm HFC

Evans Tuning explained to me that a SC is not effected by exhaust mods other then more power. He said only things on the intake side of the motor effects blower psi. do you have a hondata intake manifold gasket? I just found that almost all of mine were loose just a little. so hopefully I should hit the posted 19psi from SOS. Also Ilovemyhonda1984 I think hit 18-19 also...something just doesn't seem right. then again my 4.2" pulley only hits 8psi and not the posted 10psi.

I just saw your pulley chart and dropping .4" of pulley size should have put you in the 16-17psi range. I would say...BLV???

RAIN H8R

The main thing to consider here is the rpm of the blower. On an f20c with a 3.0 and a 1220/1200 your spinning at 56,xxx rpm, and with a 3.2 your at 52,9xx rpm (Both a 9,000 rpm redline). Paxtons site claims the 1200s limit is 1,000 rpm less than the 1220 (1200 is 52,000, and the 1220 is 52,000), probably because the fins of the impeller blade extend all the way to the case voulte housing. So techincally, your over spinning the 1200 with a 3.2 pulley, but on a 1220 your about 50rpm under the limit. Perhaps Ill ask Paxton what the blower REALLY can handle when I talk to them this week about getting my blower repaired/replaced.

Torque obsessed. I have a 3.0 pulley, I am seeking 14psi with the 1200. Seeing as how you have proved you make 14.4ish psi with the 3.4in would you consider a trade? I have a one size smaller belt then what SOS sells for the 3.0. It fit better and the tensioner wasnt maxed out. Just a thought if your looking to try the 3.0. I beleive i have a SOS 3.0, 3.2, and a 3.6/3.8 in my inventory.

s2konroids

sure will do over the weekend.

JawKnee

I decided to quickly mock something up yesterday afternoon. I'm not ready to hack up the car yet, and this was a lot easier and temporary. Plus, it should (hopefully) maximize the duct of the AUT cooling plate. I'll probably finish it by painting it black, use better edging/trim pieces, somehow seal the hole in which the intake tubing goes through the heat shield (perhaps a grommet of some sort?). Maybe apply some heat reflective tape as well

Any thoughts on whether or not this could be beneficial? I'm sure it can't hurt? Sorry about the horrible phone pictures:






Definitely looking forward to Torque Obsessed's next round of tuning/dyno.