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I have decided to walk away from running a vacuum pump all together due to the maintenance and mess that tends to come with them. I know the gains are real, but not sure it's worth the trouble for track only use.
When they work right, they are great. I haven't found that balance yet. Really not sure why it's pulling so much more oil now vs when I had it on the SBE LS7 setup. Definitely makes a difference with the 5.3 block. So gonna keep trying to make it work. Next move is to plumb the outlet directly to the dry sump tank, and then vent the tank into the catch can. This is how I've seen it done on other setups and it works well.
When they work right, they are great. I haven't found that balance yet. Really not sure why it's pulling so much more oil now vs when I had it on the SBE LS7 setup. Definitely makes a difference with the 5.3 block. So gonna keep trying to make it work. Next move is to plumb the outlet directly to the dry sump tank, and then vent the tank into the catch can. This is how I've seen it done on other setups and it works well.
Talk to Bill at GZ.. He will let you know the best way.
When they work right, they are great. I haven't found that balance yet. Really not sure why it's pulling so much more oil now vs when I had it on the SBE LS7 setup. Definitely makes a difference with the 5.3 block. So gonna keep trying to make it work. Next move is to plumb the outlet directly to the dry sump tank, and then vent the tank into the catch can. This is how I've seen it done on other setups and it works well.
and this is one of the bigger reasons why i went straight to a dailey 5 stage. vacuum pump and oil pump built into one, without the worry of ever pulling too much oil.
Started building an enclosure for the throttle bodies to see how that would work. It's not going to be 100% sealed off. Not sure if this is going to hurt it but that's what testing is for. Still need to add in a bridge to connect the upper section of the intake to the top of the enclosure. It's pretty much as tall as the bottom of the hood. So even without it, that's about the space I have. It's roughly 3".
Signed up for Street Car Takeover in Oklahoma on May 18th. Really hoping for 158+mph traps in the roll racing event. Borrowing a set of slicks to try from a stop as well. I'll be on a 26" tire for both.
I've always thought that if I was building an enclosure for throttle bodies like that, I'd just make a flat plate that went under them, and use the hood as the top surface ... sealing it up with appropriately shaped foam.
Yeah, I thought about that too but I saw that the hood lifts at higher speeds. So that would pretty much break the seal of the foam to the hood.
Thinking that's possibly due to the air from the front feed intake pushing it up.
Like I mentioned, the "lid" literally touches the under side of the hood. So, either way, that's as much clearance as there is.
Whatever the end result is, I want it to look clean too, lol.
Decided to scrap that lid thing for now. Once I added the bridge, it hit the hood. Maybe I'll work on something that seals the whole thing to the underside of the hood, like Grubinski mentioned. That's for another day.
Got the new wheels. They are definitely heavier than the other 17s/15s. Hopefully this doesn't affect too much.
Put the nitrous spacers back under the TBs. Going to revist that. Most likely keep it around 150hp to 200hp MAX and only for special occasions.
Welp, SCT OKC has come and gone. Unfortunately, I don't have any good news about the event, aside from the car still running and driving. The day started off rough. Track went hot around 10am, when it was already 3600DA out, no clouds in the sky, and the sun shining down. It was hot, to say the least.
Went out and made my first pass. Honestly, it felt great, aside from a weird issue of hesitation during the shifts. Came back around to find out I only trapped 137mph... My heart sank. Pulled the datalog to see that it was pulling 50% fuel out of every gear. I was shocked to see this. I pulled about 20-25% fuel out of the main fuel table and went back up.
This time, picked up about 4mph and ran a 141mph. Still a long way off from where I thought I should be, but a step in the right direction. On that run, I forgot to start the datalog and for some reason, the 3" screen wasn't recording to the SD card. So, I had no data on that run. Decided to pull another 10%, since the first change helped. They announced the start of eliminations and the 141mph trap put me in the second highest class with a 140-149MPH bracket. Hopped in the car to pull up to the lanes, and it would not crank. Sat there trying to start it for, what felt like ages. Tried to push start it and we couldn't get enough speed to get it going. Ended up missing out on the first round and my weekend was done.
Packed it up and watched my friend take 2nd place in the next class down. She was consistently trapping 137-138 all day and got robbed in the finals to an over zealous BMW. We tried to get a run back, but her car sprung a small oil leak and they wouldn't let her run it back, understandably.
Got home last night. Pulled the car in the garage and gave it a quick glance over. Didn't see anything obvious for the cause of all the extra fueling. Opened up the laptop to see if I could find anything there... Eventually I landed on the culprit. A mistake I made. Took the car out the Tuesday prior to the event and did a rip to make sure everything was good. It was asking for a little less fuel everywhere, but nothing crazy. 3-5% or so. Made the change in the tune. Then I started looking around at other things. I had made an advanced table so I could show the E85 content on the 3" screen. I changed the table type to a fuel flow modifier without thinking. The tune was adding 73% fuel!!! This is why pulling the 20-25% helped pick up some MPH. At least it's nothing physically wrong with the car. Turned off that table.
Welp, SCT OKC has come and gone. Unfortunately, I don't have any good news about the event, aside from the car still running and driving. The day started off rough. Track went hot around 10am, when it was already 3600DA out, no clouds in the sky, and the sun shining down. It was hot, to say the least.
Went out and made my first pass. Honestly, it felt great, aside from a weird issue of hesitation during the shifts. Came back around to find out I only trapped 137mph... My heart sank. Pulled the datalog to see that it was pulling 50% fuel out of every gear. I was shocked to see this. I pulled about 20-25% fuel out of the main fuel table and went back up.
This time, picked up about 4mph and ran a 141mph. Still a long way off from where I thought I should be, but a step in the right direction. On that run, I forgot to start the datalog and for some reason, the 3" screen wasn't recording to the SD card. So, I had no data on that run. Decided to pull another 10%, since the first change helped. They announced the start of eliminations and the 141mph trap put me in the second highest class with a 140-149MPH bracket. Hopped in the car to pull up to the lanes, and it would not crank. Sat there trying to start it for, what felt like ages. Tried to push start it and we couldn't get enough speed to get it going. Ended up missing out on the first round and my weekend was done.
Packed it up and watched my friend take 2nd place in the next class down. She was consistently trapping 137-138 all day and got robbed in the finals to an over zealous BMW. We tried to get a run back, but her car sprung a small oil leak and they wouldn't let her run it back, understandably.
Got home last night. Pulled the car in the garage and gave it a quick glance over. Didn't see anything obvious for the cause of all the extra fueling. Opened up the laptop to see if I could find anything there... Eventually I landed on the culprit. A mistake I made. Took the car out the Tuesday prior to the event and did a rip to make sure everything was good. It was asking for a little less fuel everywhere, but nothing crazy. 3-5% or so. Made the change in the tune. Then I started looking around at other things. I had made an advanced table so I could show the E85 content on the 3" screen. I changed the table type to a fuel flow modifier without thinking. The tune was adding 73% fuel!!! This is why pulling the 20-25% helped pick up some MPH. At least it's nothing physically wrong with the car. Turned off that table.
On to the next one.
Jonathon, I make it a habit to read plugs. I bet yours are borederline fouled if it’s truly adding that much fuel. It’s good practice to carry an extra set in the spares box with you to events like this. Stay after it, it’s a fast car.
Jonathon, I make it a habit to read plugs. I bet yours are borederline fouled if it’s truly adding that much fuel. It’s good practice to carry an extra set in the spares box with you to events like this. Stay after it, it’s a fast car.
I brought some with me. I'm going to pull them out here in a bit
I know fueling problem ruined your day and trip overall, but I throw all expectations out the window during the summer heat. It just kills N/A cars. Good for dialing in lots of other things and ironing out bugs, but running good times in the heat is next to impossible. Just be glad you are working out the kinks before the good air shows up!
I know fueling problem ruined your day and trip overall, but I throw all expectations out the window during the summer heat. It just kills N/A cars. Good for dialing in lots of other things and ironing out bugs, but running good times in the heat is next to impossible. Just be glad you are working out the kinks before the good air shows up!
I wasn't expecting it to be as hot as it was, but you're right. This weather does us ZERO favors. I now know not to make changes to the tune without testing them. No matter how insignificant they "might" be. Any change could potentially lead to a bigger issue. I will also wire in a secondary push button for the starter, if that issue arises again.
any plans to seal under the linkage? if you can get everything fairly tight, you will have a decent shot at creating some nice positive pressure at speed. (i know you know this.. i am just hoping you do something to seal that area up and take full advantage of the setup.. lol)
I did get a little over zealous on those cuts, lol. I still have the pieces I cut out. I could trim them up and then tape them back into the open space.
I lost count on what round I'm on.. Let's just call it 37....
Went to fire up the car the other day, and it wasn't holding idle very well. It was surging up and down. It was getting late out so I called it a night.
Took everything apart and tried to silicone the gaskets that were in the middle of the carbon sheet and the TBs. It got better, no surge, but I couldn't get the idle to come down. It was holding around 1300-1400. Took it for a quick drive and as soon as I came off the throttle, the surge came back and it wouldn't drop below 2000rpm.
Needless to say, I removed that carbon piece and it's sitting on the shelf. I also pulled the cowl hood off and went back to the stock hood, with the TBs sticking out of it. So far, I believe this ran the best, since it's not pulling hot engine bay air in.
As much as I didn't want to, I ordered a lexan scoop. Hopefully that doesn't take too long to come in and only needs minimal work to fit. This will also allow me to stand the radiator up and get a better flow of air through it. So, in the end... Kind of a win/win.
04-18-2024, 07:24 PM
