RB REV TII Claims?
RB REV TII Claims?
So the other day, I was considering exhaust options again and reread the product description for Racing Beat's REV TII Turboback system.
(REV TII Exhaust System for 87-91 TURBO II - Racing Beat)
10psi out of a 1987 RX7, and 59HP for something that only came with 182HP stock? Most cars I see here on the forums take a bit more work than a turboback to get to 240+HP, so I was a little skeptical about these claims. I emailed Racing Beat to ask if the cars tested had any preliminary work done on them to dramatize the effect (i.e. free flowing intake, porting, wastegate porting, fuel pump, etc.). Tech support just emailed me back to tell me:
I don't doubt the possibility, but I'd like to know if anyone out here on the forum has ever replicated these results on their car? Otherwise, what have you guys done to get to similar power figures? (Of course, factoring in the age of most of these motors)
(REV TII Exhaust System for 87-91 TURBO II - Racing Beat)
10psi out of a 1987 RX7, and 59HP for something that only came with 182HP stock? Most cars I see here on the forums take a bit more work than a turboback to get to 240+HP, so I was a little skeptical about these claims. I emailed Racing Beat to ask if the cars tested had any preliminary work done on them to dramatize the effect (i.e. free flowing intake, porting, wastegate porting, fuel pump, etc.). Tech support just emailed me back to tell me:
The horsepower number quoted is correct. A fuel cut controller is required. Bear in mind that the exhaust system delivered on this chassis proved to be very restrictive. Accepting the fact that the chassis is now no longer emissions-legal with the removal of the catalytic convertor and associated emissions controls, the unassisted boost level increases from the factory-limited setting to approximately 10-11 psi (chassis specific). The exhaust evaluation processes were performed on "healthy", low mileage engines configured within our engine dynamometer facility.
Joined: Oct 2003
Posts: 1,600
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From: Norcal/Bay Area, CA
They are comparing the stock 5 psi to 10 psi. That's the main reason it makes more power.
On the stock turbo, increasing the boost by 1 psi will net you about 10 whp.
Increasing the boost by 5 psi gets you about 50 hp. Add a little for improved turbo efficiency with a less restrictive exhaust and a 59 hp gain is reasonable.
However at that point, you are pushing old, stock systems (ecu, injectors, fuel pump, etc) pretty close to their maximum output.
On the stock turbo, increasing the boost by 1 psi will net you about 10 whp.
Increasing the boost by 5 psi gets you about 50 hp. Add a little for improved turbo efficiency with a less restrictive exhaust and a 59 hp gain is reasonable.
However at that point, you are pushing old, stock systems (ecu, injectors, fuel pump, etc) pretty close to their maximum output.
They are comparing the stock 5 psi to 10 psi. That's the main reason it makes more power.
On the stock turbo, increasing the boost by 1 psi will net you about 10 whp.
Increasing the boost by 5 psi gets you about 50 hp. Add a little for improved turbo efficiency with a less restrictive exhaust and a 59 hp gain is reasonable.
However at that point, you are pushing old, stock systems (ecu, injectors, fuel pump, etc) pretty close to their maximum output.
On the stock turbo, increasing the boost by 1 psi will net you about 10 whp.
Increasing the boost by 5 psi gets you about 50 hp. Add a little for improved turbo efficiency with a less restrictive exhaust and a 59 hp gain is reasonable.
However at that point, you are pushing old, stock systems (ecu, injectors, fuel pump, etc) pretty close to their maximum output.
Joined: Mar 2001
Posts: 31,837
Likes: 3,233
From: https://www2.mazda.com/en/100th/
pretty much everyone who has gone from completely stock to completely stock + FCD and the turbo back exhaust has done it....
i would suggest that the 182hp is flywheel, and your 240hp number is rear wheel. an S4 T2 is more like 150rwhp, so the rwhp number with the exhaust is 210, which is about what they do
i would suggest that the 182hp is flywheel, and your 240hp number is rear wheel. an S4 T2 is more like 150rwhp, so the rwhp number with the exhaust is 210, which is about what they do
pretty much everyone who has gone from completely stock to completely stock + FCD and the turbo back exhaust has done it....
i would suggest that the 182hp is flywheel, and your 240hp number is rear wheel. an S4 T2 is more like 150rwhp, so the rwhp number with the exhaust is 210, which is about what they do
i would suggest that the 182hp is flywheel, and your 240hp number is rear wheel. an S4 T2 is more like 150rwhp, so the rwhp number with the exhaust is 210, which is about what they do
It needs to be a legal crime for not specifying wheel or flywheel hp.
Still, that's a hell of a bump in power output. Would most catbacks paired with a presilencer/high flow cat and a 3" downpipe see those sorts of gains? IIRC Racing Beat said their TII Power Pulse catback only increases HP by 7-10 by itself. That's a pretty staggering difference.
Still, that's a hell of a bump in power output. Would most catbacks paired with a presilencer/high flow cat and a 3" downpipe see those sorts of gains? IIRC Racing Beat said their TII Power Pulse catback only increases HP by 7-10 by itself. That's a pretty staggering difference.
Like said above, this allows more boost (with an FCD, RTek, etc) and that helps increase boost and that's where the gains are.
Any companies 3" turboback will do this. Racing Beats just doesn't look ricey and is quiet, hence why so many brothers like it.
Joined: Mar 2001
Posts: 31,837
Likes: 3,233
From: https://www2.mazda.com/en/100th/
Ah, of course it comes down to that.
It needs to be a legal crime for not specifying wheel or flywheel hp.
Still, that's a hell of a bump in power output. Would most catbacks paired with a presilencer/high flow cat and a 3" downpipe see those sorts of gains? IIRC Racing Beat said their TII Power Pulse catback only increases HP by 7-10 by itself. That's a pretty staggering difference.
It needs to be a legal crime for not specifying wheel or flywheel hp.
Still, that's a hell of a bump in power output. Would most catbacks paired with a presilencer/high flow cat and a 3" downpipe see those sorts of gains? IIRC Racing Beat said their TII Power Pulse catback only increases HP by 7-10 by itself. That's a pretty staggering difference.
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Look at most boosted 4 cylinders you can buy today, and putting on full exhaust plus turning up the boost will get you 30-50 horsepower and similar torque gains. They're typically marketed as "stage 2" upgrades.
I made 200hp & 199tq at 10psi.
I run RB 2.5 downpipe & 2.5 presilencer. Then a custom 2 1/4 dual exhaust.
They're claims are all about freeing up exhaust so you can run 10psi and make those numbers.
I run RB 2.5 downpipe & 2.5 presilencer. Then a custom 2 1/4 dual exhaust.
They're claims are all about freeing up exhaust so you can run 10psi and make those numbers.
I believe the claims based on my experience.
I dynoed @ 191HP with these mods:
RTEK 1.7
3" TID
Stock downpipe
2.5" high flow cat
RB non-turbo cat back
5-6PSI
DYNO THREAD
Later I swapped to just the RB REV TII catback and it was a whole lot faster even with the boost at the same level.
Vince
I dynoed @ 191HP with these mods:
RTEK 1.7
3" TID
Stock downpipe
2.5" high flow cat
RB non-turbo cat back
5-6PSI
DYNO THREAD
Later I swapped to just the RB REV TII catback and it was a whole lot faster even with the boost at the same level.
Vince
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