Tom's GTLIMITED
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This section of the forum is a great resource if you're looking for ideas, and it's a cool way of obtaining technical information that may otherwise not have been posted. (Members can use the Search functionality at top right of the forum to speed up finding things) Please respect others' contributions and don't diss anyone - keep comments helpful, factual, positive and polite. One thread per vehicle or owner please - don't start lots of threads about just one car. And if you need assistance with your car and want to host a spanner day, please use the appropriate section of the forum: http://mr2.org.nz/phpbb3/viewforum.php?f=35 Thank you.
This section of the forum is a great resource if you're looking for ideas, and it's a cool way of obtaining technical information that may otherwise not have been posted. (Members can use the Search functionality at top right of the forum to speed up finding things) Please respect others' contributions and don't diss anyone - keep comments helpful, factual, positive and polite. One thread per vehicle or owner please - don't start lots of threads about just one car. And if you need assistance with your car and want to host a spanner day, please use the appropriate section of the forum: http://mr2.org.nz/phpbb3/viewforum.php?f=35 Thank you.
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- Club Member - MR2OCNZ
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- Joined: Wed Aug 10, 2011 9:26 pm
- Stomping Ground: Hawkes Bay
- Prime Mover: SW20
- First name: Tom
Re: Tom's GTLIMITED
Got the exhaust all wrapped and turbo beanie on
Car can now come off the hoist while I sort out loom, ECU, injectors and other things like coolant hoses, radiator etc..
Still a while yet but I'm happy with the progress I've made in the past few months
Really need to paint the rest of the car too
Car can now come off the hoist while I sort out loom, ECU, injectors and other things like coolant hoses, radiator etc..
Still a while yet but I'm happy with the progress I've made in the past few months
Really need to paint the rest of the car too
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- First name: Tom
Re: Tom's GTLIMITED
Has to pull the dash out, the wiring in this car is a bit dodgy. There was an immobilizer installed which is now gone
Pulled a lot out which isn't being used
All speakers and sound system wiring gone
I need to fix the dash board up before I reinstall it
I tucked the body loom away under the centre console, mounted fuse box in behind passenger seat, extended and rerouted tail light loom to go through the rear fender.
Oh, I've also realized I haven't mentioned in this thread I did install a KAAZ LSD a couple years ago
Love it, definitely worth the money
Pulled a lot out which isn't being used
All speakers and sound system wiring gone
I need to fix the dash board up before I reinstall it
I tucked the body loom away under the centre console, mounted fuse box in behind passenger seat, extended and rerouted tail light loom to go through the rear fender.
Oh, I've also realized I haven't mentioned in this thread I did install a KAAZ LSD a couple years ago
Love it, definitely worth the money
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- First name: Tom
Re: Tom's GTLIMITED
Started doing more dumb shit
Always wanted to vent the radiator through the hood.
If you've ever been over 200km/h in your 2, you will know that front end starts floating...
Even the chicane at Taupo track can induce under steer with enough speed
Needed to reduce that lift! Perhaps even create front end downforce
Having proper ducting and flow will also aid in cooling, not that mr2's have much trouble in that department with all the coolant capacity but I'm still using that to convince myself this is a good idea
As always, i start working away and forget to take photos, but here is where I'm at:
Used the old radiator to mock up mounts out of alloy, and cut up some spare rad hose I had lying about.
Factory fans will no longer fit, but they are far too heavy anyway so will be purchasing some slim 10" ones
Leaned forward quite a bit..
The bottom sits about the same height as the old rad support (which is now removed via drilling out spot welds)
I will be making an undertray/ducting that seals to the bumper
And provide protection to the radiator itself as the car is very low
I've cut the bulkhead, 450x250
Not a huge hole, but hopefully enough to expell what is consumed
I wanted to make the exit ducting as straightforward as possible, and I didn't want a huge vent in the hood.
The ramp will start outside the frunk, so any rain water will not pool up in the wheel well and just land on the undertray
The hood cutout will be 450 wide too, but most likely a little taller
I figure with a raised section (like a gurneyflap) in front of the hood vent, the negative pressure zone will 'suck' the excess pressure being built up in front of the bulkhead just after the radiator and make up for the small vent size and such large radiator and entry
...but only time will tell
New radiator arrived
Onto the ducting next, before I take the scary step of cutting the hood up
Always wanted to vent the radiator through the hood.
If you've ever been over 200km/h in your 2, you will know that front end starts floating...
Even the chicane at Taupo track can induce under steer with enough speed
Needed to reduce that lift! Perhaps even create front end downforce
Having proper ducting and flow will also aid in cooling, not that mr2's have much trouble in that department with all the coolant capacity but I'm still using that to convince myself this is a good idea
As always, i start working away and forget to take photos, but here is where I'm at:
Used the old radiator to mock up mounts out of alloy, and cut up some spare rad hose I had lying about.
Factory fans will no longer fit, but they are far too heavy anyway so will be purchasing some slim 10" ones
Leaned forward quite a bit..
The bottom sits about the same height as the old rad support (which is now removed via drilling out spot welds)
I will be making an undertray/ducting that seals to the bumper
And provide protection to the radiator itself as the car is very low
I've cut the bulkhead, 450x250
Not a huge hole, but hopefully enough to expell what is consumed
I wanted to make the exit ducting as straightforward as possible, and I didn't want a huge vent in the hood.
The ramp will start outside the frunk, so any rain water will not pool up in the wheel well and just land on the undertray
The hood cutout will be 450 wide too, but most likely a little taller
I figure with a raised section (like a gurneyflap) in front of the hood vent, the negative pressure zone will 'suck' the excess pressure being built up in front of the bulkhead just after the radiator and make up for the small vent size and such large radiator and entry
...but only time will tell
New radiator arrived
Onto the ducting next, before I take the scary step of cutting the hood up
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- Club Member - MR2OCNZ
- Posts: 356
- Joined: Wed Aug 10, 2011 9:26 pm
- Stomping Ground: Hawkes Bay
- Prime Mover: SW20
- First name: Tom
-
- Club Member - MR2OCNZ
- Posts: 356
- Joined: Wed Aug 10, 2011 9:26 pm
- Stomping Ground: Hawkes Bay
- Prime Mover: SW20
- First name: Tom
Re: Tom's GTLIMITED
This was revision 3 of the exit ducting
Thought it was okay
Sat to far back though so got cutting again and this is revision 4
I think this will be the final design, I'm pretty happy with how it turned out
Might paint it at some stage, or maybe just wrap it
Still got to get some fans
And make the inlet ducting, I'm out of material now though.
Not quite sure what I'll do with this, maybe a two story fin setup. Help push flow in the right direction
I don't want it to be too complicated though, and undo all the weight reduction I've done
Thought it was okay
Sat to far back though so got cutting again and this is revision 4
I think this will be the final design, I'm pretty happy with how it turned out
Might paint it at some stage, or maybe just wrap it
Still got to get some fans
And make the inlet ducting, I'm out of material now though.
Not quite sure what I'll do with this, maybe a two story fin setup. Help push flow in the right direction
I don't want it to be too complicated though, and undo all the weight reduction I've done
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- Club Member - MR2OCNZ
- Posts: 356
- Joined: Wed Aug 10, 2011 9:26 pm
- Stomping Ground: Hawkes Bay
- Prime Mover: SW20
- First name: Tom
Re: Tom's GTLIMITED
I'm getting better at taking photos of things I've done, kind off haha
Cut the rough outline of the bonnet, still a lot to do
Undertray is done, fans are in, front bumper is boxed
And still have some fab to do in the engine bay before wiring begins
Cut the rough outline of the bonnet, still a lot to do
Undertray is done, fans are in, front bumper is boxed
And still have some fab to do in the engine bay before wiring begins
- Benckj
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Re: Tom's GTLIMITED
Like your design and interested in final result once car painted, etc. Front bonnet air duct should be interesting to see. Others with a similar design have had it collect loads of leaves & debris when car not in use. Depending on your garage storage it might be wise to install a trap door to flush clear.
Is screamer pipe going to stick out though engine lid or do you have other plans to conceal? I seem to recall that its legal to have a screamer as long as its located behind passenger cabin.
Is screamer pipe going to stick out though engine lid or do you have other plans to conceal? I seem to recall that its legal to have a screamer as long as its located behind passenger cabin.
Jim Benck
90 rev 1 parts car
98 rev 5 GT- all the mods
90 rev 1 parts car
98 rev 5 GT- all the mods
- 85AW20v
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- First name: Simon
Re: Tom's GTLIMITED
With those fans, you can cut out every second concentric ring to give more flow through them. They're quite restrictive - do a bit of calculation and you'll see what I mean.
You also need to make sure your opening is enough to let all the air through. I'm thinking that anything less then the size of the radiator won't be enough. I was talking to a guy at the 8 hour trackday I did on 1 November at Taupo, who races an SW20 in Lemons. They've done the same thing as you thinking it would hep with cooling but they now have overheating issues. By not having the opening the same size as the radiator, you are effectively reducing the size of the radiator to the size of the opening you've got. Well - that's my thoughts anyway!!
You also need to make sure your opening is enough to let all the air through. I'm thinking that anything less then the size of the radiator won't be enough. I was talking to a guy at the 8 hour trackday I did on 1 November at Taupo, who races an SW20 in Lemons. They've done the same thing as you thinking it would hep with cooling but they now have overheating issues. By not having the opening the same size as the radiator, you are effectively reducing the size of the radiator to the size of the opening you've got. Well - that's my thoughts anyway!!
See ya
Simon
AW11 Racecar - 860kg
Simon
AW11 Racecar - 860kg
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- Club Member - MR2OCNZ
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- Stomping Ground: Hawkes Bay
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- First name: Tom
Re: Tom's GTLIMITED
Id say it won't catch more it did before, but I do expect it to require maintenanceBenckj wrote: βMon Nov 16, 2020 1:10 pmLike your design and interested in final result once car painted, etc. Front bonnet air duct should be interesting to see. Others with a similar design have had it collect loads of leaves & debris when car not in use. Depending on your garage storage it might be wise to install a trap door to flush clear.
Is screamer pipe going to stick out though engine lid or do you have other plans to conceal? I seem to recall that its legal to have a screamer as long as its located behind passenger cabin.
Not sure what I'm doing with the screamer yet, looking to get a muffler for it for the tuning. Would be bloody annoying on the Dyno haha
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Re: Tom's GTLIMITED
Good advice, I will look into that85AW20v wrote: βMon Nov 16, 2020 7:11 pmWith those fans, you can cut out every second concentric ring to give more flow through them. They're quite restrictive - do a bit of calculation and you'll see what I mean.
You also need to make sure your opening is enough to let all the air through. I'm thinking that anything less then the size of the radiator won't be enough. I was talking to a guy at the 8 hour trackday I did on 1 November at Taupo, who races an SW20 in Lemons. They've done the same thing as you thinking it would hep with cooling but they now have overheating issues. By not having the opening the same size as the radiator, you are effectively reducing the size of the radiator to the size of the opening you've got. Well - that's my thoughts anyway!!
The exit is something that had concerned me, but I'll have to figure it out once driving.
Thought it's better to start it small and I can always make the exit ducting bigger
- GDII
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Re: Tom's GTLIMITED
I guess you want to create a lower pressure behind the radiator, not a higher pressure so it will allow air to flow though it less restricted.
1990 SW20 MR2 G-Limited (GEN4 3SGTE Installed)
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2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
- Malcolm
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Re: Tom's GTLIMITED
The rule of thumb for sizing radiator inlets and outlets is 40% of the radiator frontal area for the inlet, and 60% for the outlet. The rationale is:
- the tubes and fins of the radiator restrict airflow to something around 40% of what you'd expect for the same area if there was no radiator there
- once the air has been through the radiator it should be a good 20-60 degrees warmer than when it came in, so to allow for this expansion you need more area than you did on the inlet.
Having said that, my similar setup has an outlet that is probably 40% of the frontal area of the radiator and I've not had a single issue with cooling. It's a fairly mild 3SGTE and I haven't done any track work though so take with a pinch of salt.
- the tubes and fins of the radiator restrict airflow to something around 40% of what you'd expect for the same area if there was no radiator there
- once the air has been through the radiator it should be a good 20-60 degrees warmer than when it came in, so to allow for this expansion you need more area than you did on the inlet.
Having said that, my similar setup has an outlet that is probably 40% of the frontal area of the radiator and I've not had a single issue with cooling. It's a fairly mild 3SGTE and I haven't done any track work though so take with a pinch of salt.
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Re: Tom's GTLIMITED
I've also taken into consideration that the air leaving the radiator is much hotter, therefore less dense and easier to remove
A sort of gurney flap at the beginning of the hood exit will create a negative pressure zone (similar to our the engine lid/roof line works) and help pull the hot air out from the radiator pocket
But this is all theory and I won't know till I take it out, but keep the info coming
A sort of gurney flap at the beginning of the hood exit will create a negative pressure zone (similar to our the engine lid/roof line works) and help pull the hot air out from the radiator pocket
But this is all theory and I won't know till I take it out, but keep the info coming
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- First name: Tom
Re: Tom's GTLIMITED
Drew up some ideas last night and brought it to life this afternoon
Figured Louvres, especially at the rear of the hood cut (and the front apron) will stop any airflow trying to lift the hood
And it looks kinda cool I think, I'll have it tacked underneath and seal it with urethane after paint maybe
Still deciding
But I took some pictures again, I'm getting better at remembering. I usually just get stuck in with the music loud haha
E30 boot lid laying about, cut it up to make this
Bent louvres straight at first, but decided on a roll as well
Used some 2.5inch pipe we had
Very happy with how it's coming out
And it's cost my under $100 for the whole thing
I needed a new radiator anyway so not included in price haha
Still need to make an apron for it, not sure what I'll do there yet
Figured Louvres, especially at the rear of the hood cut (and the front apron) will stop any airflow trying to lift the hood
And it looks kinda cool I think, I'll have it tacked underneath and seal it with urethane after paint maybe
Still deciding
But I took some pictures again, I'm getting better at remembering. I usually just get stuck in with the music loud haha
E30 boot lid laying about, cut it up to make this
Bent louvres straight at first, but decided on a roll as well
Used some 2.5inch pipe we had
Very happy with how it's coming out
And it's cost my under $100 for the whole thing
I needed a new radiator anyway so not included in price haha
Still need to make an apron for it, not sure what I'll do there yet
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- First name: Tom
Re: Tom's GTLIMITED
attachment=3]IMG_20201120_180255.jpg[/attachment]
Had to take it right back to metal, it's been sprayed a few times. Interesting to see what the rest of the car will be like
Smear bog it and prime it again then leave it till I'm ready to paint the rest of the car