The 24 Hours of Lemons Forums → The Airplane-Powered MR2 → Never before has so little power been made from so much displacement!
There will be no problem drafting a push-start crew when needed. That's what the Lemons Supreme Court is for.
that just seems like a slightly inhumane penalty.
notice the exhaust height compared to the average human height:
perhaps we can call it the "black lung/eyebrow remover" penalty
you could always tie the recruits to the front tow hook and have them pull the car like sled dogs.
I think some jumper cables and another battery outside the car would do the trick, and that's something you can rustle up at the track. That's if push starting doesn't work out, of course.
I think some jumper cables and another battery outside the car would do the trick, and that's something you can rustle up at the track. That's if push starting doesn't work out, of course.
that's what we've been doing so far. you can hear a ford escort right off camera in the second video.
the problem is made worse by the length of the battery cable since the battery sits in the front of the vehicle.
oh well, this really isn't a show stopper so I'm just gonna move on for now.
i forgot to take pics of the oil tank yesterday:
as you can see, it sits nicely in the hump at the bottom of the frunk
the plan is to make two gastank like straps to go around it and line them with rubber.
Is the tank baffled at all? It looks like oil starvation could be an issue on right hand turns. Would this fit vertically (and still work with your fill cap) closer to the engine?
If the itb's runners get plumbed together with a .5"+ ID hose to a mini collector/manifold or just to each other the vacuum signal will increase from the shared cylinder pulls. It can make for a plumbing nightmare though. There is slight vacuum signal lag this way though if the hoses arent big enough. Also, because they are all shared, syncing becomes a pita unless you can separate them. The idle could be tough to get low because they are all sharing. Its a the throttle is always open & "leaking" air in and the vacuum pull is only occasionally when they're separate. Thats a big part of why the vacuum signal is low. Its effects are more pronounced at low rpms, which you're stuck with. Its tough to get a good vacuum signal with itb's, I chased these issues for a long time on my itb setup. Thats why i recommended tps/ alpha-n, its much easier to tune with itbs and 9/10 runs better with itbs. Only issue is if the tps pops, drifts, or slips from where it was set for the tune.
Hopefully my comments have been seen as constructive & (maybe) helpful cause thats my only intention, i want to see this ripping down the track!
Is the tank baffled at all? It looks like oil starvation could be an issue on right hand turns. Would this fit vertically (and still work with your fill cap) closer to the engine?
If the itb's runners get plumbed together with a .5"+ ID hose to a mini collector/manifold or just to each other the vacuum signal will increase from the shared cylinder pulls. It can make for a plumbing nightmare though. There is slight vacuum signal lag this way though if the hoses arent big enough. Also, because they are all shared, syncing becomes a pita unless you can separate them. The idle could be tough to get low because they are all sharing. Its a the throttle is always open & "leaking" air in and the vacuum pull is only occasionally when they're separate. Thats a big part of why the vacuum signal is low. Its effects are more pronounced at low rpms, which you're stuck with. Its tough to get a good vacuum signal with itb's, I chased these issues for a long time on my itb setup. Thats why i recommended tps/ alpha-n, its much easier to tune with itbs and 9/10 runs better with itbs. Only issue is if the tps pops, drifts, or slips from where it was set for the tune.
Hopefully my comments have been seen as constructive & (maybe) helpful cause thats my only intention, i want to see this ripping down the track!
the feedback is always appreciated, it's just that there's very limited time and sometimes the conversation goes down the route of perfection. i do plan on trying alpha-n but right now i need to finish the car. at this point i've proven that the motor's sensors work and megasquirt can fire it. everything else is just details as far as the motor running is concerned.
as for the baffles, there are none, and i do expect the motor to suck air occasionally. but there is a pressure accumulator on the motor to compensate for such situations. remember, this is an airplane motor after all.
i did think of making a larger shared manifold but ended up deciding i did not want to weld that much aluminium. a single manifold, single throttle and a small turbo would probably be a better way to go eventually.
hmm, you did make me think about it though. there are always more right than left turns on a road course. i'll rotate the tank 180 degrees to give it a better chance.
Marc, if you're having trouble getting the vac signal, you could make something similar using a small piece of endcapped pipe or square tube and 6 threaded hose barbs to accumulate the signal from all 5 ITB's:
http://www.technotoytuning.com/productdetail.php?p=713
Instead of making people who have been black flagged push the car. Just make the driver stay in the car and wait at Marc's paddock space for him to come back in. When he does (it shouldn't be long given his fuel consumption/fuel tank issue) then it's the black flagged team's job to use their car to give him a push (if needed).
Otherwise, if it starts on it's own and takes off, the team has to get on knees and bow to him.
What's all this talk about push starts? I thought that's why we have those silly tow hooks. Find a pickup truck and a tow strap.
it's midnight here and we're calling it quits for the first day of building a cage.
it took a ton of work to get a cage that a 6'3" person can fit inside of with the 2" rule and still be comfortable. and here it is:
(note: the bar holding the halo up in front is temporary and will not be in the final design)
but the real trick is here. even though it is super tight fitting, we can do this to get full welding around all the tubes:
we also got the seat mounted but i did not snap a pic while we had it in there.
tomorrow we have to finish the following:
a-pillar tubes
dash bar
door bars
Well, I'll be the first to ask cage questions (as every thread goes down this path that has a picture of a cage). Are your stays off your main hoop too steep of an angle as they go to the back of the car? I know at most your main hoop could only "fall back" about 8" (unlike a sedan) should they fail, but they don't appear to provide much support like they are.
[Part of my question is to educate myself. So, sorry if I'm looking at this wrong.]
Well, I'll be the first to ask cage questions (as every thread goes down this path that has a picture of a cage). Are your stays off your main hoop too steep of an angle as they go to the back of the car? I know at most your main hoop could only "fall back" about 8" (unlike a sedan) should they fail, but they don't appear to provide much support like they are.
[Part of my question is to educate myself. So, sorry if I'm looking at this wrong.]
they are almost right at 45 degrees.
Oh. Must be the angle of the camera. Or the crookedness of my eyes. Sorry. 
TeamLemon-aid wrote:Well, I'll be the first to ask cage questions (as every thread goes down this path that has a picture of a cage). Are your stays off your main hoop too steep of an angle as they go to the back of the car? I know at most your main hoop could only "fall back" about 8" (unlike a sedan) should they fail, but they don't appear to provide much support like they are.
[Part of my question is to educate myself. So, sorry if I'm looking at this wrong.]
they are almost right at 45 degrees.
well, the cage is finished. i am sunburnt all over from the welding and i ache. but the damn cage is done!
the rear mesh is at the judge's request. they wanted something just a little more substantial than glass in case something tries to intrude that way.
this is definitely my best cage yet, i'm quite proud of it.
also got all the electronics mounted: 
the empty fuse block is for the gauges and the lights that aren't in yet.
and finally, i spent a bit of time figuring out how to use megasquirt and i started leaning things out and the motor really starts coming alive with a much better idle. i was able to get all but cylinder #3 firing well.
#3 cylinder appears to have it's cam phased completely wrong. not quite sure how, but i know how it has to be fixed unfortunately. looks like the motor has to come back out so i can get to the rear mechanical cover. after that everything should be great and the motor will just need to be tuned further.
the vacuum is sill a problem but for all i know i'm pushing air into it from cylinder #3. i'll fix #3 and see where that places us at that point.
Is your seat mounted directly to the floor?
Is your seat mounted directly to the floor?
height wise yes it touches the floor in one area, but it is reinforced with attachments to the frame and the forward cross member
with taller drivers we could not take the height penalty of mounting a slider. we'll use a foam pad behind the shorter driver to get him at a comfortable driving position.
Ah. We just switched to a Kirkey and are having problems with the 2" vertical clearance. I have drivers ranging from 5'5"' to 6'2", so I pretty much HAVE to have a slider.
Ah. We just switched to a Kirkey and are having problems with the 2" vertical clearance. I have drivers ranging from 5'5"' to 6'2", so I pretty much HAVE to have a slider.
our driver variance is 5" with the taller driver being 6'4". i would suggest you cut the floor to fit the slider into the floor.
*edit* if you are nearby fort wayne, IN you can feel free to come take a look at it with your tall and short driver and see if it's a workable solution.
That is a very nice cage! I especially like how the gussets line up with the back stays, that's a really strong area.
If you use a CVT, it will cure a lot of problems. Problem is locating one that would handle that kind of torque. What were your plans in a transmission?
If you use a CVT, it will cure a lot of problems. Problem is locating one that would handle that kind of torque. What were your plans in a transmission?
How can I tell you haven't read through the whole thread?
613nn wrote:If you use a CVT, it will cure a lot of problems....
How can I tell you haven't read through the whole thread?
Because he wrote 'you' instead of the royal 'we'.
well, after some through investigation it appears that #3 cylinder's exhaust valve was stuck open slightly by a mis adjusted rocker. i can't test it tonight but it should be fixed now and i went ahead and adjusted all the valves on all the other cylinders.
down to 10 days of work left. this is insane!
The 24 Hours of Lemons Forums → The Airplane-Powered MR2 → Never before has so little power been made from so much displacement!