Sorry OP, I didn’t mean for this to get off topic from your results, I will answer a few questions and will add some info at the same time that may be of interest to you.
@ King,
Over here in Australia we don’t have any US based dyno’s, 95% of workshops use Mainline which from what I understand reads lower than say Dyno Jets for example. Personally I’m not too fused about dyno results and am more interested in how the car performs at the track. There is a particular workshop here in Aus that is notorious for crazy dyno numbers yet their cars at the track don’t perform as the dyno results indicate. Perfect example a VF commodore (Chevy SS over there) that they claimed made 900rwhp yet ran 10.3 @ 133.
@ Dynamical,
Thank you. Unfortunately I don’t remember the DA for the day, I dug up the time slip to see the date, I raced in October 2023 (time slip attached, its faded a bit due to age) so would have raced in autumn, date in top left hand corner (I think you guys call Autumn “fall”). Over here our seasons are the opposite to over there. We are in Summer here now with temps as high as 40 Deg C (105 F). The converter is stock. Once you unlocked the trans the 60ft times drop. Pic attached from the event. The car also runs Weld rear wheels and ET Street R 305’s. It was a fully prepped track so I was able to run higher pressure (22psi) in the tires.
@ Z OH 6,
As mention to King, I’m not fussed at all about the dyno numbers. To clear up any doubts about fueling, one thing I did forget to mention is the car runs a JMS, other than that the fuel system is 100% stock. Also, our 93 over here has zero ethanol, it is E0/93. The petrol station (gas station) that I buy fuel from is a top tier station. Their E85 is actually E82-83 year round including Winter and their E85 is diluted with their 93. The E85 is rated at 105 at this station. So when I fill up I use a App on my phone to work out the target Ethanol content and fill up with a blend of E82/93, there is no low quality petrol/gas (87 for example) in the mix. Also, I run lambda 0.88 at E55 and 0.84 at E0. This is done via the PE Gas/Ethanol tables in HPT as you can have independent targets based on the blend from E0 to E85 (or E55 in my case). The common suggestion (on the internet) says you need to target lambda 0.82 - 0.83 for the LT4 however what people don’t take into account is that is based on lower quality fuels that don’t have good knock resistance therefor requiring a richer mixture to quench (cool) combustion temps to aid in knock suppression, when you use a quality fuel that has better knock resistance there is no need to run “as rich” on a DI engine hence targeting 0.88 on the E55/93 mix. I have done multiple passed down the track at 0.88 (at E55) with nil issues. Also, the LT4 runs a 0.020” top ring end gap therefor there isn’t a concern about needing to run richer to prevent end gap butting (compared to the high comp LT1 for example). It also goes without saying that having the SOI/EOI in the sweet spot helps as well as dialing in the VCT as the OEM setting made less power on the dyno vs the changed VCT numbers at WOT. To add on top of this, being it was a 28 Deg C (84F) day there was even less strain on the fuel system so it is possible to run E55 on a stock LT4 fuel system with a JMS with nil pressure drop issues on both the high/low sides as well as not maxing the high side pumps 130 deg limit.
If it’s of any interest to anyone, the other mod the car has that may or may not be helping its performance at the track is the under tray I made to fill the void under the rear of the car once the OEM rear muffler is removed. You can read about it in this thread…..
https://www.camaro6.com/forums/showt...=585799&page=3
I have recently done this mod to the underside of the OEM blowers lid, again doubtful that there is any real gains but the fact that I can do it I did. Post #15827.
https://www.camaro6.com/forums/showt...6559&page=1131
I am going to change the lower to increase boost a little. I know I will be sacrificing the level of E I can run however it isn’t difficult to change the lower pulley size again to reduce boost / increase E levels. I will be experimenting with pulley sizes vs Ethanol levels to find the sweet spot and planning on racing again in Winter.
Again, Sorry OP, I didn’t mean for this to go off topic from your results. Hopefully my post was of some help to you
