Discussion in 'Toyota' started by Daox, Mar 18, 2008.
Do you have any pictures of it? Sounds nice.
I'll have to go take some shots later. Don't hold your breath waiting.
So, I was reading Hucho's Aerodynamics of Road Vehicles on my lunch hour and came across a very nice little chart that plotted rear vehicle taper angle (off horizontal) versus Cd. Of course my own car immediately pops into mind and I must measure to get a good idea of how bad things are. Well, it turns out things AREN'T very bad at all! I went and grabbed a side view of a Paseo and popped it into my CAD software. Looks like my rear windshield angle is roughly 16.7°. According to the chart the optimum is very near 15°. Hurray for the Paseo for being pretty darn close.
Of course, this brings up the idea of rear spoiler removal... we'll get to that later.
___Your Paseo has a nice front and decent rear (top) profile already. With the Spoiler “thingie ” removed, I am not seeing what else you are going to do. Basjoos mods? I bet there is a lot more underneath however.
___The following is a simple trick that both Honda and Toyota have been doing to help clean up some of their sedans and hatches Cd using wheel dams.
___Looking underneath the iCDTi, that thing was almost completely covered from tip to tail including some interesting shaped around the exhaust outlet internal to the bumper. Being a sharply cutoff hatch however kills its overall.
Accord Tire wheel dams.
iCDTi exhaust through the bumper cowling.
iCDTi from the front looking back
Rear looking forward.
That is one handsome Honda!
Very handsome indeed! Thanks for the pictures Wayne. :thumbs_up:
Grille block - I was inspired by post 24 in this thread: http://www.cleanmpg.com/forums/showthread.php?t=6973
Those foam exercise mats that come in packs of 4 and fit together like a puzzle. Cut with a razor knife. Easy-peasy.
Okay, I finally got a chance to look through the service manual. According to it, the thermostat should start to open up at 176-183°F. So, it looks like I'm going to be needing a new thermostat.
I also looked up at what temp my fan kicks in and its no big surprise that its on at 201°F. This is about the max temp I have hit so far. So, it sounds like my fan is probably kicking in quite a bit. I wish there was an easy way to monitor when its on vs off. I thought about splicing in a relay that powered a light, but I'd rather not cut into the wiring. In any case, I need to get the temp back down so I can go ahead with the aero mods and such.
Well, it got above 40°F today, so I was out working on the Paseo. I took a lookg between the bumper and the deflectors I had initially planned on making are going to be a bit tougher than originally thought. The contours inside the bumper cover are not exactly easy to replicate. There is also no way to mount the deflectors. Here is why. The red line indicates where the deflector would go. On both sides there are a few obstructions.
So, I'm going to need to think about how I'm going to do those some more.
In the mean time. I did something else that'll also help. I took some of our favorite piping insulation and stuffed it all around the radiator so as to create a seal around it. Now, very little air should be able to go around the radiator instead of through it. This should reduce the amount of air needed to pass through the grill, and allow me to close more of it off. Here are the pics.
Before. Its hard to see, but theres roughly a .25 - .5 inch gap between the radiator and the support member.
This is by no means a replacement for the deflectors. As you can see in the 2nd to last picture there is a big opening where the headlight is (look in the lower right). The deflector would go between the radiator and headlight opening so air can't just go through that hole. However, its a start. It'll be interesting to see if this has any effect on the coolant temperature.
Speaking of coolant temperature, I picked up my 192°F thermostat (180°F is stock) this Saturday when I was out and about for emissions testing. I'll have to get that in, but I would like to see what this does to the setup as it currently is.
The front end of the Insight could use a LOT of cleaning up in this way. You'll definitely find me underneath it fabbing up better underbody panels this summer, and tweaking the front grill.
I finally got pictures of my grille block. Click on My Rides to see.
Its been about a week now, but I do have the 192°F thermostat in. It appears that the original thermostat was not a problem as the scangauge now shows that my coolant temp is 12°F higher than it was before (original thermostat was 180). The scangauge now shows my coolant temp around 211-213, yet the radiator fan doesn't kick in (and its supposed to kick in at 201). So, I know something is messed up. It looks like the coolant temp sensor may be shot. Luckily this isn't a very expensive part either.
On top of figuring that out, another problem has arisen. I've had a small exhaust leak near the back of the car for a while now where it goes up and over the rear axle. I just haven't had the time until last week to fix it. So, I got it all welded back up and this quieted down the car. However, I can now hear another problem! The front brakes are dragging a fair amount. So, add that to the checklist of things to do.
Its good to know something can be fixed and my mileage will increase, but its bad to know theres more maintenance to do.
Well, I did the brake job last night (sorry, no pics) and everything went fine. The Paseo now has brand new pads and rotors. So, I went to bed in the new brakes and low and behold the noise is still there. I'm a bit annoyed as I'm now thinking its probably a wheel bearing. Its a bit noisy when going straight, but when I turn right it gets louder on the right side. I'll be checking this out this weekend hopefully.
In the mean time I have hit my best tank despite the problems. I must say I'm a bit surprised that I pulled off 53.7 with these problems.
The saga of maintenance continues.
Tonight I pulled the hub off the Paseo to replace the front passenger wheel bearing. Not too much to it and it went easier than I thought. Tomorrow I'll be taking the hub in to get the bearing pressed out and new bearing installed. This time I got pics.
Everything pulled off.
The bearing and seals.
A new, thinner headgasket will increase your compression some if you're still looking to do that.
Thanks, but I can't get a thinner head gasket. The stock one is only .5mm thick.
What about changing your tires for the low rolling resistance tires used on the Honda Insight or others?
I'll definitly be looking into LRR tires when I need new ones. The ones on the car have about 30,000 miles on them and are in great shape still.
Well, the hub is back on the car and it rolls NICE now. The downside was the press work cost me $40 (almost the cost of the bearing). Pretty steep for a few minutes of work IMO. In any case, I'm sure it was a lot cheaper than taking it in. Plus, it was fun.
I'm glad it worked for you! I'll bet that 60mpg segment won't be long in showing up now, either!
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