20B First Gen
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S3 RX-7 - 20BT 450 RWHP
Joined: Dec 2004
Posts: 312
Likes: 0
From: Brisbane, Australia
I just got off the phone to my engine tuner.
Had custom intake fitted which was for sale on here, car has just made 295 rwhp.
Previous best was 245 rwhp, this is on a Dyno Dynamics, so although it might not sound much to you US guys, our dynos do read 15-20% less than Dyno Jets etc which would put it up around the 340 rwhp mark.
Will write up a bit later after I have driven the car to compare the differences
Had custom intake fitted which was for sale on here, car has just made 295 rwhp.
Previous best was 245 rwhp, this is on a Dyno Dynamics, so although it might not sound much to you US guys, our dynos do read 15-20% less than Dyno Jets etc which would put it up around the 340 rwhp mark.
Will write up a bit later after I have driven the car to compare the differences
I am so glad you have that sucker on and dyno'd already! Please post the dyno chart, I am eagerly waiting to see the graphs!! Has it been final tuned, or does he think more is in it?
Thread Starter
S3 RX-7 - 20BT 450 RWHP
Joined: Dec 2004
Posts: 312
Likes: 0
From: Brisbane, Australia
Originally Posted by GtoRx7
I am so glad you have that sucker on and dyno'd already! Please post the dyno chart, I am eagerly waiting to see the graphs!! Has it been final tuned, or does he think more is in it?
This would be equal to around 354 rwhp on a dynojet, going on the loss difference
How do the dyno dynamics compare to a Mustang dyno. Because the mustangs dyno about 10% less than a dynojet I think? And the mustang is what I did all my runs on.
Also, DAMN, you gained over 50-60 rear wheel horsepower!!!
Also, DAMN, you gained over 50-60 rear wheel horsepower!!!
Last edited by GtoRx7; Jul 19, 2006 at 11:14 PM.
Thread Starter
S3 RX-7 - 20BT 450 RWHP
Joined: Dec 2004
Posts: 312
Likes: 0
From: Brisbane, Australia
Originally Posted by GtoRx7
How do the dyno dynamics compare to a Mustang dyno. Because the mustangs dyno about 10% less than a dynojet I think? And the mustang is what I did all my runs on.
Also, DAMN, you gained over 50-60 rear wheel horsepower!!!
Also, DAMN, you gained over 50-60 rear wheel horsepower!!!

Not sure mate, I haven't heard of the Mustang dyno's over here.
What diff gearing are you gonna use next? I remember your video entering the freeway. You went through the gears and when you reached 5th, you weren't going very fast.
Reminded me of my REPU with its 4.625.
Reminded me of my REPU with its 4.625.
Thread Starter
S3 RX-7 - 20BT 450 RWHP
Joined: Dec 2004
Posts: 312
Likes: 0
From: Brisbane, Australia
Originally Posted by Jeff20B
What diff gearing are you gonna use next? I remember your video entering the freeway. You went through the gears and when you reached 5th, you weren't going very fast.
Reminded me of my REPU with its 4.625.
Reminded me of my REPU with its 4.625.
It has plenty of top end, don't worry about that

Here's a video of top end going, 4th gear, had to back off, but it was well over 200 km/h
This is before the new intake too (50 rwhp less)
http://www.rotary20b.com/20b-top.wmv
Thread Starter
S3 RX-7 - 20BT 450 RWHP
Joined: Dec 2004
Posts: 312
Likes: 0
From: Brisbane, Australia
Originally Posted by Jeff20B
Have the coolant and oil temps gone up any? What is your normal temp range?
You lose a bit of low end, with the tripple tb's it is very responsive, a bit harder to drive on light throttle than before.
But the mid & top end difference is huge, my engine builder is a well know drag racer and rotary shop over here, he's stating it would run 120 mph down the 1/4, I will take it down the 1/4 to find out what it does.
Thread Starter
S3 RX-7 - 20BT 450 RWHP
Joined: Dec 2004
Posts: 312
Likes: 0
From: Brisbane, Australia
Originally Posted by NOPR
is that the new cast stainless hotside? it doesnt look like iron.






