Lighter is better!
06-15-06, 12:00 PM
#51
NorCal 7's Co-founder
383Mazda, please try to have some working knowledge of airflow and of how cooling systems work before you open your mouth. The majority of people in this thread are trying to help BlackS5 out, not offer up incorrect assumptions on what will or will not work.
I have seen VERY SIGNIFICANT differences in both water and oil temps while running a reverse vented hood. If they weren't effective then why would so many professional race teams use them on their cars?
I have seen VERY SIGNIFICANT differences in both water and oil temps while running a reverse vented hood. If they weren't effective then why would so many professional race teams use them on their cars?
06-15-06, 12:33 PM
#52
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Originally Posted by 383Mazda
BlackS5... What's the waight difference in the rear window swap? I'd like to do that to mine also. And about the hood, do what you want! I really doubt you'd see ANY differnce in any of your guages as far as water temp goes if you had a hood scoop or not, and if you stuck a "boost guage" under your hood, you wouldn't see a difference in there either. If it really did raise engine bay temps enough to warm up the rediator, your thermostat would just open sooner, that's all 
That's also why they design radiator fans and shrouds, you could drive with your hood off and you're not going to see a major difference! They make it seem like you'll run 500º with a hood scoop!
And if people keep complaining about "ricing up" your rx7 (which was made in japan, isn't it???) Just stick a V8 in there, it's the opposite of "rice," it shoudl keep them happy right?
Good luck with YOUR car.
That's also why they design radiator fans and shrouds, you could drive with your hood off and you're not going to see a major difference! They make it seem like you'll run 500º with a hood scoop!And if people keep complaining about "ricing up" your rx7 (which was made in japan, isn't it???) Just stick a V8 in there, it's the opposite of "rice," it shoudl keep them happy right?
Good luck with YOUR car.
http://grannysspeedshop.com/
for more info.
06-15-06, 12:39 PM
#53
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Originally Posted by BoostedRex
BlackS5, I can appreciate what you are doing. As long as you do take care in stripping weight off of your car then you can reverse that process if/when you feel like it. And yeah, lexan rear hatch and windows would surely shed some weight off of your car. Also, a nice fiberglass or CF hood will also help to shed some weight off of the front end.
Now here is my take on the hood issue. Granted I'm bias towards the 5one5 Innovations vented hood, but my argument is a solid one. A TII hood will over pressurize your engine bay and will seriously hinder your cooling systems abilities. It doesn't matter what other benefit you might gain here, it's not worth it. Our engines run hot enough as it is and hindering the cooling system at all is a bad idea. Now a vented hood like the one from 5one5 will help with engine bay temps and will also improve the efficiency of the cooling system. There will be a low pressure area created over the vents in that hood. That low pressure area will naturally draw more air out of the vents to try and neutralize the pressure differential, thus drawing more fresh air in through the nose of the car and more hot air out of the engine bay. And what is directly in between the nose of the car and the engine bay? The radiator! So you'll see increased airflow through the radiator while at speed. And last but not least, the 5one5 hood is made out of fiberglass so it will be significantly lighter than a stock TII hood.
While I am also a purist when it comes to the '90 GTUs model, this isn't my car. So I do wish you the best of luck in turning your GTUs into the car that you truly want. And I hope that everyone else will let you be a big boy and make up your own mind as well. If there is anything I can do to help then just let me know. And if you are interested in any of the parts from 5one5 just let me know. Good luck bro and I'll be looking forward to meeting you at one of the NorCal events.
Zach
Now here is my take on the hood issue. Granted I'm bias towards the 5one5 Innovations vented hood, but my argument is a solid one. A TII hood will over pressurize your engine bay and will seriously hinder your cooling systems abilities. It doesn't matter what other benefit you might gain here, it's not worth it. Our engines run hot enough as it is and hindering the cooling system at all is a bad idea. Now a vented hood like the one from 5one5 will help with engine bay temps and will also improve the efficiency of the cooling system. There will be a low pressure area created over the vents in that hood. That low pressure area will naturally draw more air out of the vents to try and neutralize the pressure differential, thus drawing more fresh air in through the nose of the car and more hot air out of the engine bay. And what is directly in between the nose of the car and the engine bay? The radiator! So you'll see increased airflow through the radiator while at speed. And last but not least, the 5one5 hood is made out of fiberglass so it will be significantly lighter than a stock TII hood.
While I am also a purist when it comes to the '90 GTUs model, this isn't my car. So I do wish you the best of luck in turning your GTUs into the car that you truly want. And I hope that everyone else will let you be a big boy and make up your own mind as well. If there is anything I can do to help then just let me know. And if you are interested in any of the parts from 5one5 just let me know. Good luck bro and I'll be looking forward to meeting you at one of the NorCal events.
Zach
Thanks boosted. Im hoping that ill be able to show up next weekend at the meet on treasure island. I live 20 miles south so it would be a shame if i didn't. Hope to see you all there!
06-15-06, 12:44 PM
#54
NorCal 7's Co-founder
We can talk some more about airflow and what would help to both lighten your car up and improve the performance. Just look for me there, I'll be pretty easy to spot. 
I'll be the guy who pretty much knows everybody there. haha. But seriously, just ask for me by my forum name or my real name and most anyone there will be able to point you in the right direction.
Zach
I'll be the guy who pretty much knows everybody there. haha. But seriously, just ask for me by my forum name or my real name and most anyone there will be able to point you in the right direction.Zach
06-15-06, 12:45 PM
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Originally Posted by robtechfabrications
and the 5one5 hood mentioned above isnt ricey...it's functional...ricey would be if the vents had absolutely no performance gain...but they do so its very functional.
06-15-06, 01:02 PM
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Originally Posted by BoostedRex
What would you consider to be ricey? I'm curious to hear that explanation.
06-15-06, 01:26 PM
#59
Originally Posted by blacks5
The speedglass will save roughly 45 lbs for the front and rear windows each. Check out
http://grannysspeedshop.com/
for more info.
http://grannysspeedshop.com/
for more info.
Rear window with the hatch frame is 45........but the front windshield is not.
06-15-06, 01:43 PM
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Originally Posted by classicauto
A windshield doesn't wiegh 45 lbs.....more like 25-30
Rear window with the hatch frame is 45........but the front windshield is not.
Rear window with the hatch frame is 45........but the front windshield is not.
06-15-06, 02:27 PM
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Originally Posted by blacks5
Ahh, sorry for the misinformation. Im just going by what the web site stated.
"...Lightweight Speedglass racing windows now available for '86-'95 RX-7's...pre-formed "high optical quality" GE Lexan windows are a great way to shave some weight from your RX-7. Available in thicknesses from .093" to .250", you can save 50%-75% of the weight of your stock glass. These windows are hard coated, highly scratch and chemical resistant, even resisting vigorous rubbing with steel wool! The patented anti-scratch coating is so effective that you can even run wipers! Available individually or in complete sets that include the windshield, right & left door, and rear hatch window replacements. Here are some comparison examples...
2nd gen RX-7 factory windshield 65lbs vs Speedglass at 20lbs for 1/8” material (25lbs for 3/16”), a savings of 45lbs on the windshield alone!
3rd gen RX-7 factory windshield 62lbs vs Speedglass at 19lbs for 1/8” material (23lbs for 3/16”), a savings of 43lbs on the windshield alone! "
06-15-06, 02:31 PM
#62
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Originally Posted by blacks5
Ahh, sorry for the misinformation. Im just going by what the web site stated.
06-15-06, 02:39 PM
#63
Originally Posted by blacks5
grannysspeedshop.com
"...Lightweight Speedglass racing windows now available for '86-'95 RX-7's...pre-formed "high optical quality" GE Lexan windows are a great way to shave some weight from your RX-7. Available in thicknesses from .093" to .250", you can save 50%-75% of the weight of your stock glass. These windows are hard coated, highly scratch and chemical resistant, even resisting vigorous rubbing with steel wool! The patented anti-scratch coating is so effective that you can even run wipers! Available individually or in complete sets that include the windshield, right & left door, and rear hatch window replacements. Here are some comparison examples...
2nd gen RX-7 factory windshield 65lbs vs Speedglass at 20lbs for 1/8” material (25lbs for 3/16”), a savings of 45lbs on the windshield alone!
3rd gen RX-7 factory windshield 62lbs vs Speedglass at 19lbs for 1/8” material (23lbs for 3/16”), a savings of 43lbs on the windshield alone! "
"...Lightweight Speedglass racing windows now available for '86-'95 RX-7's...pre-formed "high optical quality" GE Lexan windows are a great way to shave some weight from your RX-7. Available in thicknesses from .093" to .250", you can save 50%-75% of the weight of your stock glass. These windows are hard coated, highly scratch and chemical resistant, even resisting vigorous rubbing with steel wool! The patented anti-scratch coating is so effective that you can even run wipers! Available individually or in complete sets that include the windshield, right & left door, and rear hatch window replacements. Here are some comparison examples...
2nd gen RX-7 factory windshield 65lbs vs Speedglass at 20lbs for 1/8” material (25lbs for 3/16”), a savings of 45lbs on the windshield alone!
3rd gen RX-7 factory windshield 62lbs vs Speedglass at 19lbs for 1/8” material (23lbs for 3/16”), a savings of 43lbs on the windshield alone! "
Its like the CAI's that claim 20hp for your Civic - haha
06-15-06, 03:44 PM
#64
Argh, too much technobabble.
A hood scoop will make your engine bay cooler. Why? Because it let's cold air in. Warm air gets forced through the bottom. How much cooler? Not much. A scoop isn't that big. That's my explanation as an engineer. If you really want power from cold air, try a cold air intake with seals to keep hood air away from your intake.
I've read that the RX-7 has 200lbs. of upholstery, from someone who actually gutted his '7. This includes floor covering, miscellaneous plastic, the dash, door covers, the passenger seat (the whole thing, not just upholstery), etc. Would I myself take any of it out to save weight? No. I might consider Lexan in the future, though.
18lbs. = 1 HP on a stock N/A
13.5lbs. = 1HP on a stock turbo or heavily upgraded N/A
8.75lbs. = 1HP on a heavily upgraded turbo, or an insane N/A
5 lbs. = 1 HP on an insane turbo
146 lbs. = 1 mpg city
Why? Performance = horsepower / weight. Decreasing weight by X% is the same as increasing horsepower by X%. Dumping your girlfriend will give you 9HP and over 1mpg, which is better than a cold air intake.
A hood scoop will make your engine bay cooler. Why? Because it let's cold air in. Warm air gets forced through the bottom. How much cooler? Not much. A scoop isn't that big. That's my explanation as an engineer. If you really want power from cold air, try a cold air intake with seals to keep hood air away from your intake.
I've read that the RX-7 has 200lbs. of upholstery, from someone who actually gutted his '7. This includes floor covering, miscellaneous plastic, the dash, door covers, the passenger seat (the whole thing, not just upholstery), etc. Would I myself take any of it out to save weight? No. I might consider Lexan in the future, though.
18lbs. = 1 HP on a stock N/A
13.5lbs. = 1HP on a stock turbo or heavily upgraded N/A
8.75lbs. = 1HP on a heavily upgraded turbo, or an insane N/A
5 lbs. = 1 HP on an insane turbo
146 lbs. = 1 mpg city
Why? Performance = horsepower / weight. Decreasing weight by X% is the same as increasing horsepower by X%. Dumping your girlfriend will give you 9HP and over 1mpg, which is better than a cold air intake.
Last edited by ericgrau; 06-15-06 at 03:53 PM.
06-15-06, 10:53 PM
#65
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the website stated that if you replace all your glass with speed windows you'll shed about 100 lbs. which if true would be awesome but at 850 for the whole set i think i'll hold off for awhile but definately good to knwo where i can find them in the future...does anybody know if the side windows slide right and and still roll up and down? i assume the would?
also i'll be at the treasure island meet next weekend...the white FC with a huge grenade on the hood (my company logo) or just ask for rob or robtech.
also i'll be at the treasure island meet next weekend...the white FC with a huge grenade on the hood (my company logo) or just ask for rob or robtech.
