Okay guy\'s..So I am currently playing around with options of where to fit my water rad, intercooler and oil in my 20B set-up..
I wanted to get some thoughts on the options I am playing with as I am sure each has pro\'s and cons and mainly I want to try and get the best cooling option.
I am thinking some kind of v-mount set-up. This gives me two options rad top or bottom? I could also have the rad at the bottom but in a more stock FD position and place IC or oil cooler somewhere else? Maybe flat with some ducting to it? Other options is a nearly vertical mounted (Traditional) rad and front mount?
Here are some pics or each..
More traditional rad mounting.
(http://i157.photobucket.com/albums/t59/Leeroy_25/Mazda%20RX7%2020B/RadFit1_zpsfbb64e26.jpg)
Front would need lifting some more I think.
A vague oil cooler option to go with this..
(http://i157.photobucket.com/albums/t59/Leeroy_25/Mazda%20RX7%2020B/RadFit3_zps1c47f57c.jpg)
Some room for fans but I think I will get slimline ones
(http://i157.photobucket.com/albums/t59/Leeroy_25/Mazda%20RX7%2020B/RadFit5_zps0fb0c073.jpg)
Vertical Rad
(http://i157.photobucket.com/albums/t59/Leeroy_25/Mazda%20RX7%2020B/RadFit9_zps638e1ea5.jpg)
Now with the bumper fitted you get the idea of how the venting might work.. The first pic would definitely need the front end of the rad lifted a close to the slam panel as possible as air will just not get to the rad properly I don\'t think?
(http://i157.photobucket.com/albums/t59/Leeroy_25/Mazda%20RX7%2020B/RadFit7_zps43a15da5.jpg)
With the front end lowered for a more v-mount set-up it gets better but I am a little nervous about the front of the rad being so low?
Also heat rises and I guess this set-up is forcing the hot air down. I guess it will work well when moving but stationary I bet not so well?
(http://i157.photobucket.com/albums/t59/Leeroy_25/Mazda%20RX7%2020B/RadFit8_zps5a118382.jpg)
What do people reckon?
At the moment I plan to run two separate intercoolers where the stock oil coolers fit and mount one or two oil coolers around the radiator somewhere. That is what I am thinking anyway.
Thank you
Lee
That black bar your horn is mounted too in the first pic would need removed to get it all in right
Fur that front piece off where you bonnet attaches. You will have to reroute the wiring though. If your using 2 intercoolers then put the rad vertical. Best air flow IMO. Do not lay it flat as you will require to have the fans on all of the time to get air flow through it.
Put one large oil cooler or 2 smaller oil coolers in front of the radiator. Again it will have best air flow, plus the rad fans will suck air through them when temps activate the fans.
Any reason you are wanting 2 ICs?? I don\'t think it will create any lag, not noticeable on a 20B anyway, but it means routing of pipe work. What size pipe work are you going for? 2.5"?
why not try and get a dual pass i/c if possible?
You wont need to remove the bit the bonnet catch is attached too
Thanks for the replies guys.. Quite a difficult decision really as it marks a turning point in the build I feel!
So first of all.. Why do a couple of you suggest I remove the main front support bar? Surely that is the one doing all the work holding the front end together. and support the bonnet latch so it does not wang around in the breeze! The upper bar is pretty flimsy without? Or would you just replace said bar with a smaller box section or angle?
Also if you are all suggesting vertical rad position then Is the removal of the bar just to get added flow through the rad? Sounds like we have not got any real fans of the V-mount set-up then? I certainly would not place it horizontal.. I think I can get a near stock angle by lowering the rear of the rad and raising the front as much as possible. Possibly steeper. If I went that route I would plan to create a decent duct from the bumper and then good size opening out through the bonnet on the other side. I think this option would give the most space issues with fitting the other coolers around though?
Regarding IC piping I will go for at least 2.5" possibly 3" depending on the cooler. At least 2.5" keeps it all nice and constant from end to end.
Reason for two coolers is I thought it was a different option that I have not seen before that could offer a decent cooling solution for both air and water which I would say are more of the cooling issue?
I don\'t think the front cross piece offer much structural strength chassis wise anyway. With the strut brace on your car you have the strength between strut towers, anything forward of that doesn\'t really offer chassis strength. IMO.
Cutting the piece away gives you more space to mount things.
The only v mount worth doing is with rad and IC leaving oil coolers in the stock locations.
I would go with front mount oil cooler and rad giving the best airflow through the coolers and the ICs where you said if you are wanting to run a different setup in tha regard. It leaves you plenty of room to run piping across to the second cooler and back to the engine
If you cut that piece out just get some bonnet clips to hold the bonnet down
That is an option I guess Grant although I would say it does add strength and stiffness to the chassis. Especially in the event you have a shunt god forbid! Currently I don\'t have a strut brace fitted either as I will need to make something that fits around the 20B plenum!
Think I am going to try the set-up I was talking about. Only way to do it is get a couple of intercoolers and see if they fit! That will be the clincher. If I can get the intercoolers in then I am laughing. if not I might have a couple going spare!
Cheers
Lee
Just to be sure... When I am looking at intercoolers - for which I have about 3 options I can see at the moment..
If 1 intercooler is rated at 400bhp for instance does it stand to reason that 2 of these intercoolers would be rated to 800bhp? Or as I suspect is it not quite that simple? Do I need worry more about CFM flow and pressure drop? I presume I could increase CFM by increasing the inlet and outlet pipe sizes if need be?
Thank you
Lee
I did this when i fitted my fmic, gave me heaps of extra room to work with, might give you some ideas too
(http://i848.photobucket.com/albums/ab48/wolfie1_bucket/DSC_0542.jpg)
(http://i848.photobucket.com/albums/ab48/wolfie1_bucket/DSC_0547.jpg)
Thanks Wolfie, I will keep that in mind.. Nice set-up.. What front mount are you using?
Cheers
Lee
This 1 http://www.extremeturbosystems.com/ETS-93-95-Mazda-RX7-FD-Intercooler-Kit.html