Blower Motor Upgrade Kit

brcorp · brcorp's Garage

Has anyone tried this yet? Or even better has anyone figured out a short cut? How about a disassemble view?

ScottB chime in here....

rusnak · 07-11-2007, 11:22 AM

hey bill, can you post a link? Where did you find that?

brcorp · brcorp's Garage

Here is the Link to RetroAir: http://www.retroair.com/

BTW, the "Click To Enlarge" buttons in the above picts don't work - LOL

mthomas58 · 07-11-2007, 12:45 PM

Bill, this won't work on a 1987. Box cover and motor mounting changed in 1986. I talked with Rock (owner of Retroair) about this during last year's sweaty season!

DaddyGlenn · DaddyGlenn's Garage

But it will work on a '78. So....

Quote:

Originally posted by brcorp
Has anyone tried this yet? Or even better has anyone figured out a short cut? How about a disassemble view?....

brcorp · brcorp's Garage

Quote:

Originally posted by mthomas58
Bill, this won't work on a 1987. Box cover and motor mounting changed in 1986. I talked with Rock (owner of Retroair) about this during last year's sweaty season!

I had the same conversation with him, that's why I'm looking for a DIY here or info on the RetroAir unit so I can create a copy

JeffreyNMemphis · 07-11-2007, 03:03 PM

I am not unhappy about the volume of air CFM that comes through the vent, I just with it could be about 20 degrees colder. This after installing a new drier and converting to 134a (it was just air before, now it is cool air). The little resistor knob? Seems to have zero effect on the temperature.

scottb · 07-11-2007, 03:27 PM

Quote:

Originally posted by brcorp
ScottB chime in here....

Why, I'd be glad to!

I know Griffiths sells a variable speed fan control that doesn't limit you to three speeds, and I think it will work on the later model cars. I haven't seen any other products to increase the fan motor size or speed for the later model cars, however. You might give Charlie Griffiths or Ron Maxwell at Rennaire a call and see what they have to say about increasing the motor size.

Also, several people (Jim Sims, Hugh R., and others) have installed a muffin fan over the resister pack in the passenger floorboard. Apparently the extra airflow into the evaporator helps with cooling.

HTH

Scott

rusnak · 07-11-2007, 03:51 PM

jeffrey, the knob controls the frequency of the compressor clutch engagement. I found that the best ac cooling occurs on even freeway cruising at about 70mph because the compressor is spinning at about 2500 rpm and the motor is not throwing out much heat.

I wonder if you have dirty evaporator fins? I get 42F vent temps on a 80-85F dergree day.

mthomas58 · 07-11-2007, 04:16 PM

Quote:

Originally posted by scottb
Why, I'd be glad to!

Also, several people (Jim Sims, Hugh R., and others) have installed a muffin fan over the resister pack in the passenger floorboard. Apparently the extra airflow into the evaporator helps with cooling.

HTH

Scott

I'm one of the referenced "others" who has experimented with fans at the evaporater inlet. I don't know how much a performance impact you will notice.....but it certainly can't hurt!

Evap assist fan install in floorboard

DaddyGlenn · DaddyGlenn's Garage

Quote:

Originally posted by scottb
....Also, several people (Jim Sims, Hugh R., and others) have installed a muffin fan over the resister pack in the passenger floorboard. Apparently the extra airflow into the evaporator helps with cooling.

HTH

Scott

Now that sounds like an easy modification. Perhaps Jim or Hugh will share their parts list.

Hugh R · 07-11-2007, 07:55 PM

I just went to a computer surplus place and bought three 12V muffin fans (DC of course) and screwed them into the front of the evaporator inlet behind the passenger floor board. My car didn't have A/C from the factory, so my ventilation system is very different. The A/C was an aftermarket add on, which I converted to R-134a. BTW the fans cost about $2 each. Here's a pic. Also, I don't have the bowtie thingie and the only intake to the evaporator box is the one you see. I think other 911s with factory air have another intake for the A/C. BTW. I get A/C air from my top, center and underdash vents, I think most of our vintage 911s get it from the center vents only. I also don't get squat for air velocity from the vents.

brcorp · brcorp's Garage

Thanks for the responses.

Let me restate my question. I want more velocity/cfm out of my vents, this will come at the expense of some cooling as the air will spend less time at the evaporator but I'm guessing it will be a trade off as the more air will be hitting me in the face. So is there an an existing motor / squirrel cage that would fit with some modifications?

BTW, ScottB how's that additional condenser?

DaddyGlenn · DaddyGlenn's Garage

Bill,

It seems to me that these inlet fans would increase the throughput of your system and are a relatively easy modification.

scottb · 07-12-2007, 09:07 AM

Quote:

Originally posted by brcorp
BTW, ScottB how's that additional condenser?

Bill: My car has turned into such a garage queen, I frankly don't know how the a/c is doing these days. I'm scheduled to use it tomorrow and through the weekend, and I'll try the a/c then. Last time I used it, though, it was working great.

The latest mod being considered is to install a rear fenderwell condenser in front of the left rear wheel, away from the exhaust system. If I ever have to do work on my system and have the R12 evacuated, I think that's the next step I'm going to take.

Scott

dmwallace · dmwallace's Garage

I have the Kuel variable speed fan controller on my '89 3.2 - I was trying to both improve the velocity and also be able to better control the fan noise. The product works well for both.

Regards,
David.

scottb · 07-12-2007, 04:38 PM

David: Was the installation of the variable speed control difficult?

scottb · 07-13-2007, 12:00 PM

Quote:

Originally posted by brcorp
BTW, ScottB how's that additional condenser?

Bill: I just went out to the garage and fired up the car and the a/c. The garage is at least 85 degrees, and pretty humid. After about five minutes, I'm getting 40 degree vent temps. Keep in mind that this is with NO airflow over the rear condenser (the car isn't moving). So, to answer your question -- I guess that additional condenser is pretty damn good!

Scott

shbop · 08-22-2007, 06:17 AM

http://www.unwiredtools.com/utboost.html

Careful with these guys. Customer service is terrible, oh, and the product doesn't work as advertised. Save your money

scottb · 08-22-2007, 07:09 AM

Quote:

Originally Posted by shbop

http://www.unwiredtools.com/utboost.html

Careful with these guys. Customer service is terrible, oh, and the product doesn't work as advertised. Save your money

It's an interesting concept. Basically, it seems like the device adds voltage to the input on the fan, thereby increasing its speed. My assumption is that it also increases the risk of the fan motor burning out.