It is AHHH-LIVE!
Race Director
Joined: Jun 2004
Posts: 13,963
Likes: 709
From: WI
I like the way the Tri-Ys are performing. I would still choose that design for a street car.
My PE is set about 15% more than stock (esp above 3200 rpms). I kinda doubt my sensor is "numbed" by the teflon paste, but I might try you tap-test. Thx! And, thx for our conversation recently!
My PE is set about 15% more than stock (esp above 3200 rpms). I kinda doubt my sensor is "numbed" by the teflon paste, but I might try you tap-test. Thx! And, thx for our conversation recently!
Thread Starter
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Racer
Joined: Sep 2008
Posts: 387
Likes: 2
Brain fart. :o The Finnish set was not tri-Y. This is 1 1/2" to 1 5/8" and made of stainless. Nevertheless, they are manufactured fairly close to where I live and with Y-pipe not that much more that TPIS or Melrose shipped after taxes and such.
Thread Starter
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Thread Starter
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Burning Brakes
Joined: Jul 2006
Posts: 1,080
Likes: 2
From: Pittsburgh PA
My PE is set about 15% more than stock (esp above 3200 rpms). I kinda doubt my sensor is "numbed" by the teflon paste, but I might try you tap-test. Thx! And, thx for our conversation recently!
Thread Starter
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Just tweak PE mode enrichment to allow for 900 milivolts at yoru WOT conditions across the rpm range. Thats a safe area to be at for now, and then dyno tune with wideband from there. Hard to tell how it all runs at first. Car will run smoothly at WOT with very lean conditions but just wont be making as much power as it could. Thats not safe so keep an eye on it and when its close, play with timing. AFR's like 32-36 deg depending on combination
Does that mean I'm dead nuts or a hair too rich? Would I still be O.K. if I dropped 5% and had the O2 sensor reading "mean" closer to 900mV?
My PE is based on the power curve simulation by EA Pro -- which is why I think I got the PE curve right for all rpms.
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Burning Brakes
Joined: Jul 2006
Posts: 1,080
Likes: 2
From: Pittsburgh PA
I rescanned to perform your test. Every one of my O2 sensors readings are between 900 and 950mV from 2500 to 5500rpms. Most are 914mv or 932mV.
Does that mean I'm dead nuts or a hair too rich? Would I still be O.K. if I dropped 5% and had the O2 sensor reading "mean" closer to 900mV?
My PE is based on the power curve simulation by EA Pro -- which is why I think I got the PE curve right for all rpms.
Does that mean I'm dead nuts or a hair too rich? Would I still be O.K. if I dropped 5% and had the O2 sensor reading "mean" closer to 900mV?
My PE is based on the power curve simulation by EA Pro -- which is why I think I got the PE curve right for all rpms.
PE is suppose to follow the torque curve once MAF is maxed out. So you are doing good, just take it down abit to lean it all out.
Thread Starter
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Double-check spark plug wires for correct firing order.
Make sure dizzy is oriented correctly.
Use zinc-enriched oil for break-in (or add a bottle of additive)
Prime motor with oil (via dizzy or with starter).
Install new chip with new engine config.
If you have new, coated headers, (and it's a roller motor), run 5min & cool, then run 10 & cool -- to break in coating.
Get ready to do the new motor dance!
Racer
Joined: Oct 2007
Posts: 478
Likes: 1
Very, very nice. It looks like a real tire shredder to me. 
One note on the total timing. When I had my motor on the engine dyno with AFR 195 Comp heads and 11.1:1 compression we started out with 32 degrees of timing to be safe. So after some break in time and tuning we started to get serious on the power. One thing we did was increase the timing to 34 degrees looking for a nice gain. Wrong, power dropped off. Hmmmm, so we set the timing to 30 degrees total to see what would happen. Power went back up to where it was at 32 degrees so we left the timing at 30.
That is my motor combination and yours may like something different. I hope you get it on the dyno. I would love to see what the numbers are. I bet torque is way, way up there along with some nice horsepower numbers.
One note on the total timing. When I had my motor on the engine dyno with AFR 195 Comp heads and 11.1:1 compression we started out with 32 degrees of timing to be safe. So after some break in time and tuning we started to get serious on the power. One thing we did was increase the timing to 34 degrees looking for a nice gain. Wrong, power dropped off. Hmmmm, so we set the timing to 30 degrees total to see what would happen. Power went back up to where it was at 32 degrees so we left the timing at 30. That is my motor combination and yours may like something different. I hope you get it on the dyno. I would love to see what the numbers are. I bet torque is way, way up there along with some nice horsepower numbers.
