(ENGINE) 20B First Gen RX-7
07-21-06, 01:15 AM
#102
S3 RX-7 - 20BT 450 RWHP
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Well just got home from picking the car up down the coast.
What a difference!
The car is a LOT more responsive, a little harder to get off the line quickly
Cannot roll and floor it in first otherwise wheelspin & rev limit, same with change from 1st to second
It has a little less torque down low, not hugely noticable, but the way the car revs now is very noticable, same with the throaty induction it now has
Quite a lot of people have messaged me asking about costs etc, even thought its na, you'd want to have a spare 20k or so for the complete conversion
Here are a couple of pics of the new setup
What a difference!
The car is a LOT more responsive, a little harder to get off the line quickly
Cannot roll and floor it in first otherwise wheelspin & rev limit, same with change from 1st to second
It has a little less torque down low, not hugely noticable, but the way the car revs now is very noticable, same with the throaty induction it now has
Quite a lot of people have messaged me asking about costs etc, even thought its na, you'd want to have a spare 20k or so for the complete conversion
Here are a couple of pics of the new setup
03-24-07, 12:59 AM
#107
haha .. I've got those same batteries ... they're awesome ... that quite the litte monster of a turbo there. What do you think your HP numbers will be with that? So lets see if you can actually race with this or not ... I'm betting you won't even move cause all your tires will be doing is spinning.
03-24-07, 11:48 AM
#112
Terrified.
That is insane. I am really curious as to the horsepower expectations with the turbo, and also really wanting to see videos and pictures of the car after the turbo is in there.
03-24-07, 07:17 PM
#114
S3 RX-7 - 20BT 450 RWHP
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Thanks for the comments guys
have u changed the rear end yet? still stock S3
How do you plan on getting 3 exhaust ports into 2 turbine housing inlets? Custom exhaust manifold.
That is insane. I am really curious as to the horsepower expectations with the turbo, and also really wanting to see videos and pictures of the car after the turbo is in there
So am I, it should see 400+ at moderately low boost (10 psi). For the time being I will be running the na 2.5" exhaust, which will restrict the hp a bit. Will be going 3" after I get back from a business trip to China. I'll get some pics up.
looking good!
gotta make a dyno video after your finished so we can see the beast!
Thanks mate. Will do, not sure if I'll get a chance to get a vid of it being dyno'd first up.
Here's a dyno vid of it na. It did a best of 295rwhp on a dyno dynamics here (read 15% lower than dynojet) this particular day it was 104f and around 80% humidity, not the best for top hp.
http://www.rotary20b.com/craig-dyno1.mpg
have u changed the rear end yet? still stock S3
How do you plan on getting 3 exhaust ports into 2 turbine housing inlets? Custom exhaust manifold.
That is insane. I am really curious as to the horsepower expectations with the turbo, and also really wanting to see videos and pictures of the car after the turbo is in there
So am I, it should see 400+ at moderately low boost (10 psi). For the time being I will be running the na 2.5" exhaust, which will restrict the hp a bit. Will be going 3" after I get back from a business trip to China. I'll get some pics up.
looking good!
gotta make a dyno video after your finished so we can see the beast!
Thanks mate. Will do, not sure if I'll get a chance to get a vid of it being dyno'd first up.
Here's a dyno vid of it na. It did a best of 295rwhp on a dyno dynamics here (read 15% lower than dynojet) this particular day it was 104f and around 80% humidity, not the best for top hp.
http://www.rotary20b.com/craig-dyno1.mpg
03-24-07, 07:26 PM
#115
S3 RX-7 - 20BT 450 RWHP
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Originally Posted by dj55b
haha .. I've got those same batteries ... they're awesome ... that quite the litte monster of a turbo there. What do you think your HP numbers will be with that? So lets see if you can actually race with this or not ... I'm betting you won't even move cause all your tires will be doing is spinning.
At this stage just planning on lowish boost, until I get used to it. It should put out 400+ though. I've been in a RX3 with 370rwhp & a 400+hp Series 6 and they were bloody quick, this should be around the same given the weight differences.
Yeah.. its going to be a handful, open diff with 7" wheels isn't the best combo, I'm working on it though.
03-24-07, 08:32 PM
#117
S3 RX-7 - 20BT 450 RWHP
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Originally Posted by Blackula
before the turbo, did you have ITB's??
I'll be going back to the stock 20B intake as it will easily make the power I'm after
The ITBs went to a NA 20B in New Zealand, waiting to hear the results
03-24-07, 10:16 PM
#118
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you should have just kept them and made a aluminium box to go over them that would have bin bad ***.
P.S. I am glad you have changed your mind about selling it
.
P.S. I am glad you have changed your mind about selling it
.
04-03-07, 09:08 AM
#120
I am glad you decided to keep your car. Its one of the very few interesting 1st gen projects I've seen and liked. I also own a RHD 1st gen in Trinidad. I have a 20B on the ground that I was considering whether to put it in or get a HB Cosmo and slip it in there. But I am most impressed with your HP at 6psi !!! Damn, that is HOT ! Can you tell me what the turbo exh. manifold costed you and where you got it? What tranny/clutch are you using? You will really need to upgrade both your tranny & rear end soon, looking at the HP you're already making.... Can you send me pics of under the engine bay, how exactly you mounted the motor in there etc ?
04-03-07, 05:15 PM
#121
S3 RX-7 - 20BT 450 RWHP
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Originally Posted by spanner
I am glad you decided to keep your car. Its one of the very few interesting 1st gen projects I've seen and liked. I also own a RHD 1st gen in Trinidad. I have a 20B on the ground that I was considering whether to put it in or get a HB Cosmo and slip it in there. But I am most impressed with your HP at 6psi !!! Damn, that is HOT ! Can you tell me what the turbo exh. manifold costed you and where you got it? What tranny/clutch are you using? You will really need to upgrade both your tranny & rear end soon, looking at the HP you're already making.... Can you send me pics of under the engine bay, how exactly you mounted the motor in there etc ?
Go for it I reckon
Exhaust manifold was made by Dyson Rotary www.dysonrotary.com.au and cost $650 I think it was Australian $ (around $530 USD).
Just running a stock S2 box and a button clutch at the moment, will be upgrading to a S4/5 turbo box soon.
Not sure about the diff yet, I changed the 4.4s back to stock gears hoping it will help a bit with reliability (less torque). Still deciding what to do there..
I will dig up some photos for you. Any pics of your beast?
Andrew
04-04-07, 03:27 PM
#122
S3 RX-7 - 20BT 450 RWHP
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Some photos sounds & vids of the new setup
http://www.rotary20b.com/turbo20bna.wma
http://www.rotary20b.com/turbo20bna.wmv
http://www.rotary20b.com/turbo20bna1.wmv
http://www.rotary20b.com/turbo20bna.wma
http://www.rotary20b.com/turbo20bna.wmv
http://www.rotary20b.com/turbo20bna1.wmv
