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Topic Review (Newest First)
05-20-2020 08:55 AM
predator carb guru Made it down to a 1.02 60', 4.43 1/8th mile on the brakes! Still have a tire shake issue off the line though...
02-01-2020 07:02 AM
predator carb guru Getting faster! Down to a 4.46 1/8th, 7.07 1/4 so is still wanting more fuel and it's too violent on the launch. Working on getting it settled down. Making progress but only limited time and opportunity to test....We'll get there!
01-17-2020 04:22 AM
predator carb guru So we finally made some runs on the new alky combo. After some tweaking and tuning, I ran a best run of a 4.51 @ 157.85 in the 1/8th mile. Learned some things too. First, I need to drop my leave rpm down some, maybe 500 rpm or so. I'm hitting the tires WAY too hard. Second, I'm gonna need to pull some gear out of the rearend. The car is very violent off the line and I need to settle that down. Converter might be too loose, but I need to look at my data to determine if it is or not, but had some issues getting the download. I'm going to see what happens if I drop the timing at the hit and ramp it back in down track. I'm guessing I'm going to leave better and faster. There's more in it for sure, and it wanted a lot more fuel thrown at it. I ran out of main pills to richen it, so we're gonna get larger nozzle jets and a few more pills to richen it up more. It's not far off, but it's still wanting fuel so gotta give it what it wants.....

Testing again this Sunday, so we'll see what happens with a couple of changes I can do. No nitrous yet, but getting close
11-23-2019 07:02 AM
predator carb guru More updates....Finally got the car to the track. Weather was perfect, but track was not. Made one hit, spun the tires HARD at the hit, and for about 150' down track.......I tried pedaling it but it wouldn't bite so backed off and nailed it again. Finally got traction about 200' out and ran it out.....Then heard something pop and a buzz noise in the shutdown area right as I was killing the engine. Got off the track, no fluids or parts, but I did crank it and there was a knocking noise....not on the trailer I went...even if that had been a good run, doubtful I would have gotten another. The track was so crowded that day I couldn't have ran again if I wanted to (and I did!!). Fast forward to yesterday. Had to work all week, so just left the car in the trailer. Unloaded yesterday and pulled the pan. Only thing I found in there was one of the mounting tabs for the windage screen had broken off...No biggie, just bent the screen out of the way and pulled out the chunk. Can be repaired when I freshen the engine again, not gonna hurt to run it like that. (gotta love two piece oil pans!!) Checked out the top end and bottom end, found NOTHING!!! Which is a good thing! Put it back together, put in fresh oil, and tried it again...Knock was still there. Before I pulled the pan, I had checked the converter to see if it was moving, but it didn't. After pulling the pan and trying again, it must have been "stuck", because when I went to see if it was tight, it moved. What I found was that the flexplate bolts had come loose, and one of the converter bolts. No crank damage at all, and everything looks good. So a new flexplate is on the way and we'll try again on the next test session!

Even after all of that, it still ran a 8.93 @ 183 mph....That should have easily been a 6.xx run at more than 19x mph....

fun stuff!
11-03-2019 06:41 AM
predator carb guru More updates. Tried taking the car to test, track said they would be open but they weren't. Next test day is Nov. 17, I'll be there. Idle speed was a little low though, and it had a bit of a stumble when I stabbed the throttle, so a little tweak was in order.

I went 3/4 turn shorter on the barrel valve link to richen it up a bit, and opened the throttle plates up .005" to give it more air. Now it idles at 1800 rpm (which was my target), about 2000 with the shutoff cable pulled about half way, and runs up to just under 2500 when I kill the fuel completely. That's where it's supposed to be! Can't wait to run it!!!

Here's the cooling part of it. On gas, if I ran the car for as little at 3-4 min just idling, it would get to about 160*. One pass down the track and it was in the 180-200 range and it took a lot of time to cool water sprayed on the radiator and run the fan and water pump constantly to get it down... Running on alky however......I'm actually having problems getting temp into the engine. I have to pull the shutoff cable nearly off and get rpms up over 2000 and let it run like that for several minutes to get any heat in it at all....that's not a bad thing!!! I'll take that over overheating any day of the week! I might end up putting a t-stat or restrictor in it though, to help build heat a little faster and retain it, as alky likes temp. If I can get it to 180* and keep it there, I think that would be good.....
10-26-2019 06:36 AM
predator carb guru For some reason pics didn't post so trying again.....
10-26-2019 06:33 AM
predator carb guru Well, it's running! Throttle response is WAY better than it was on carbs, and it was VERY GOOD on carbs. I still need to tweak the idle a bit, not idling high enough and a bit of a stumble if I blip it, but other than that this car has never been this responsive. I can't wait to get it to the track! It does take a bit more to get it started though. Cold, I rigged up the fuel side of my nitrous system to act as a primer and it works like a champ. Once it's been started, it only takes a little more cranking before it will fire. Little bit of a learning curve with the injection, but I know there will be a difference in performance for sure!

One more note, the new fuel tank fit like a glove! Kudos to Mike Bos Race Cars!! I was off on my calcs for capacity though. My original tank held just under 2.5 gallons. I figured based on my measurements the new one would hold just shy of 4. Turns out it holds just short of 7 gallons! What's nice about that is I can get two runs without refilling in a pinch....plan is to not have to do that, but it's nice to know I've got the capacity if needed....
10-06-2019 03:09 PM
predator carb guru Thanks! It was a lot more work than I thought.....very tedious....but it did save me about $600!!!
10-06-2019 01:44 PM
MARTINSR Daaaaamn that's cool!

10-06-2019 08:08 AM
predator carb guru More progress!!! Intake is back from Induction solutions and I've got it plumbed up! Just need to put it back on the engine and start reconnecting everything. Still waiting on the tank, but that should be on it's way this week. Couple more small things and then it's back to the track!
09-29-2019 06:23 AM
predator carb guru More updates. Intake is off and at Induction Solutions getting the bungs welded on. Tank is on the way to Mike Bos to get new one made, and I spent the day yesterday figuring out the pump mounting. That was a challenge since I don't have much room on the front of my engine. The only place I could mount it was next to the dry sump tank, but in that hole I had no room for adjustment, and the discharge fittings were blocked by the water instead I got some threaded rod, used the spacers sent with the pump and some additional ones I had, and attached it to the water pump on the left side of the engine. I had to reverse the pump to make it work, but now it's solid, out in the open, and I had just enough adjustment to tighten the drive belt. The pulley just misses the lower spacer and oil supply line to the oil pump, but it's in there! I had to remove the shroud from the radiator though because it wouldn't fit with the pump in place. Not a bad thing though, my fan actually pulls more air through the core now than it did with the shroud. Very poor design on the shroud so no great loss. And now I'll be running alky, so cooling won't be an issue any longer.

Also picked up a barrel of Renegae Racing methanol, and plan is to buy at least two more barrels over the next couple of months. That should give me enough fuel to run the races I plan to over the winter months. After that my engine is going to my cylinder head guy for some upgrades to the heads, different cam, and a few other tweaks.....We're looking at making at least another 100-150 hp on motor, and he's the guy that can get it done.....I can't wait!!!
09-21-2019 07:56 AM
predator carb guru Well, today it starts the alky conversion. Testing the last time on gas didn't go so well, it had a horrible surge going down track that I'm going to try and figure out before I pull it all apart. It wanted a lot of fuel, and picked up a ton when I gave it fuel, but the surging never went away. It did get better but i ran out of time time to test and the heat and humidity KILLED me! Ordered a cooling vest today just because of that....too dang hot!!

Anyway, alky injection here we come!
07-14-2019 07:56 AM
predator carb guru Couple updates. Trans is out of the car and apart so case, bell, and flex plate can get recert done. Was going to take it to JW already but work got in the way, vacation coming up, so it's gonna be a bit before I get it done...good thing is between the trip to JW from my house, waiting for them to do the certs, then back to the house, put it back together, and put it in the car is a one day deal.....long day, but one day regardless. Seat belts also expired, so got the new set, just need to install them. Being lazy today so I'll work on that later. Got new radio connections and helmet set as old one stopped connector is a lot shorter so need to figure out whether or not I'll have to move the radio. Cable from the antenna is only so long so I need to figure something out other wise I won't be able to plug my helmet into the comm....

While the trans is out, also need to figure out routing for fuel shutoff cable so when I install the injection, I have it routed....

Checked on a local place to modify my fuel tank to increase capacity.....won't be calling them back. They wanted $1600 plus materials!!! I called Mike Bos (car builder) and they said just send them the old tank, they will build me a new one with whatever bungs I want, and send both back for $400. You can guess what I'm going to do.....Mike even said they could do it in about two days and have it back to me.....

Inductions Solutions will be welding the new bungs on my intake. They aren't that far from here, quick turn around, and work is second to none....great price too, only $200 and they will blend the bungs into the runners as well.

I'm going to get the car back together and make some passes on gas in september, finish the tuning so I have something to compare to. Then off comes the gas stuff, on goes alky stuff, and back to the track.

Two biggest things I'm excited about, regardless of outcome of testing is MUCH cheaper fuel and lower fuel bill, and no more overheating issues......One of the best qualities of running alcohol is that engines actually have trouble building heat.....that's not a bad thing.....
07-01-2019 09:09 AM
454 Rattler Keep us updated. This sounds interesting.

06-30-2019 02:48 PM
predator carb guru Got the new nitrous system and injection to get some safety things updated (seat belt, trans case and bell housing, etc) and let this heat and humidity pass!!! WAY to hot here for me!!! Plan is to survive the summer, make sure the car is ready to go, and run again in September. Will finish tuning it on gas, then make the switch to alcohol and test again. Can't wait to see what the difference in performance is, and how much difference there is in cooling! Nitrous won't be part of the test, as I want to see how it runs on gas vs. alky. Nitrous will get tuned later on when I'm ready to play!
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