I am thinking of going with a 2.9" pulley for my Radix, Is this a good idea with my setup? Right now I am seeing about 5-6 psi with my 3.1" pulley so I thought the 2.9 will put me back up to 7-8 psi? Oh yeah I am also going to add a meth injection kit to my setup aswell. Also what are you guys running as far as timing @ WOT? I am at 20-22degs depending on IAT's. Let me know.

 

I also ordered the Dynatech Supermaxx Headers & Y-pipe for my truck, Will that help out the Radix more than the Pacesetter's did. The main reason for switching is because the Dynatechs are Stainless Steel w/Jet Hot coating and will go nicely with my Stainless Steel Corsa Exhaust.

 

No, deffanetly not a bad idea to go to the 2.9 pulley. Only problems you might see are a little belt slippage. Going with 100mm idlers and a 111" belt will help with this. Also, be surre to pin the crank. you'll need to retune as well, you will most likely need to add some fuel to PE.

Are you ACTUALLY running that much timing or is that what your high octane timing table says?

That timing seems too high to me. I'm ACTUALLY seeing only 14* or so at WOT at my shift points (6200rpm). Are you logging with hpt or efilive? are you seeing any KR? do you have a wideband?

I have the Dynatech's with JET HOT coatings. You'll LOVE them. Make sure to get the newer version or else you have to fab up a small bracke to keep the spark plug wire on #5 (i think) away from the header.

 

Thanks man, I already have the crank pulley pinned. The retune is no problem because I am doing the tuning. I am logging with EFI Live and it shows 20-22deg of timing at WOT. I am not showing any KR at all but I wondering if the timing is still to high. When I ran the 12.92 1/4 mile I was only showing 13deg of timing but when I ran the 1/8 mile it was showing 21 deg so I dont know, The only thing I can think of is cooler temps? I will be going back to the Dyno after the new pulley is installed to do some fine tuning so I can mess around with the timing. According to Tbyrne I will be getting the New version Dyanatech's. Does the Radix perform better with cats or without?

 

FI applications will always perform better with a low restriction exhaust. I kept my CATS though to stay emissions legal (to the eye anyway).

 

I just thought it might like a litlle back pressure, at least I hoped.

 

less back pressure the better. FI=get rid of exhaust ASAP.

sounds like great plans. I am a little surprised you aren't seeing more boost with a 5.3L. 5-6 on a 3.1 seems really low. Do you have 2 bar capability? if so what kpa are you seeing? when I had my 5.3 with a 3.0 pulley i was seeing 9psi easy. Your gauge, electronic? is accurate? I only ask cuz your times and HP do tell of a larger than 5psi FI set up. at least IMO.

22* may not be high for your setup. You won't get away with that timing on the 2.9 pulley and no meth. on your 1/4 with 13*vs your 1/8 with 21*, I am sure your IAT Spark add was pulling some timing. I like to see those 2 scans or screen shots of them, to answer that for real though.

however, hell yeh! crank the boost up! get the meth, it'll help with the higher boost and possible issues with running out of injector. beat Holty's time, so he can spend more money to go faster! LOL

 

I will send you the logs from both races, I have to go to work and get the laptop. I do have the 2 bar MAP installed, I am seeing a max of 145kpa on my logs. Consider the pulley a done deal, You guys convinced me.

 

Hey Dewmanshu, PM sent.

 

Hey brad got your PM

Your dyno run has...
IAT start of 124* and a finish of 138* (14* rise)
The ECT was 185* start to finish
Boost (subtracting 14.5 from psi conversion of your kpa-you actually had Hg, so I had to double convert) was a high of 6.68 and a low of 6.24

Your 1/4 mile run has...
IAT start of 158* and a finish of 178* (20* rise)
The ECT was 199* start to finish
Boost (same conversion as above) was a high of 7.26 and a low of 5.95

Those stats are once you reach 100% (you were 97.5) TPS to when you let go.

I don't have your tune, but I'd guess that 138* IAT vs 158* has some timing being pulled (9* seems like alot). Maybe your ECT does as well. Maybe. Those differences without looking at your tune make sense to me you are getting a lower command on timing due to the higher IAT.

Hope this helps ya some.