Dynorun with Powerengineering exhaustmanifold
31 January 2001, 11:47 AM
#1
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THE FACTS!
Car: Subaru Impreza MY98
Results:
-before (with Ramairfilter and scoobysport backbox): 248Lbft/ 3670 rpm and 173.7 kW/ 5860 rpm
-now (scoobysport backbox, standard airfilter, Powerengineering exhaust manifold
Car: Subaru Impreza MY98
Results:
-before (with Ramairfilter and scoobysport backbox): 248Lbft/ 3670 rpm and 173.7 kW/ 5860 rpm
-now (scoobysport backbox, standard airfilter, Powerengineering exhaust manifold
04 February 2001, 06:16 PM
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Has anyone reading tried the HKS tuned manifold? Apparently its less than a grand (before VAT?) and should make a bit of a difference to torque and top end power... Non-equal length, so it shouldn't kill the boxer note. 
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23 June 2001, 01:20 AM
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I can concur with turboke's results. I've just had one fitted to my UK99MY.
I gained more than 30lbft of torque across the rev range.
The noise level inside the car is much reduced, though is more tinny. No more headache inducing throb from my full exhaust system. The engine tone is very smooth all the way to the rev limiter.
You can see my dyno run results at
I gained more than 30lbft of torque across the rev range.
The noise level inside the car is much reduced, though is more tinny. No more headache inducing throb from my full exhaust system. The engine tone is very smooth all the way to the rev limiter.
You can see my dyno run results at
25 June 2001, 05:08 PM
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Ok, it's a simple question... If an equal length exhaust manifold works with PPP, and if it produces overboost, detonation or any other engine problems. There is nobody to answer my question? Nobody? Thanks to all...
25 June 2001, 05:24 PM
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cripes - just seen the price of the PE manifold £1500 fitted roughly!
Has anyone had one fitted to an sti - Bob Rawle tried the BPM ones - but they did not work
May go down the HKS route - should save about £200 + should be able to get it fitted a lot cheaper than that!
Has anyone had one fitted to an sti - Bob Rawle tried the BPM ones - but they did not work
May go down the HKS route - should save about £200 + should be able to get it fitted a lot cheaper than that!
26 June 2001, 02:16 PM
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Steve M.
I know of one car that has the MRT headers fitted (exhaust ports on manifold were matched to the heads during fitting) where it made a _BIG_ difference to the car... it needed a _lot_ more fuel added in the map because of the increase in efficiency... the exhaust note is different, but still boxer... I am seriously considering these headers for my rebuild.
Moray
Moray
I know of one car that has the MRT headers fitted (exhaust ports on manifold were matched to the heads during fitting) where it made a _BIG_ difference to the car... it needed a _lot_ more fuel added in the map because of the increase in efficiency... the exhaust note is different, but still boxer... I am seriously considering these headers for my rebuild.
Moray
Moray
26 June 2001, 06:19 PM
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Hmmmm interesting
I may have to go that route.
I can see a big spend coming up once I'm back from a worrk stint in the States
Can I ask a question about your Motec?
Do you have to rev the engine at the start to get it going due to lack of 'choke control' - this is the only thing that is putting me off this? - Is it worth me bothering or should I stick with the Link? - you can answer off line if you wish
I may have to go that route.
I can see a big spend coming up once I'm back from a worrk stint in the States
Can I ask a question about your Motec?
Do you have to rev the engine at the start to get it going due to lack of 'choke control' - this is the only thing that is putting me off this? - Is it worth me bothering or should I stick with the Link? - you can answer off line if you wish
03 July 2001, 03:37 PM
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Sorry for the delay in replying - I've been in the US.
My car peaked at 14.5 PSI of boost and held 13PSI. The guys at PE attached an OBD monitoring unit to the car during the run. The car was still running a healthy 10% CO, so the fuelling is nowhere near it limits yet. Retardation was also minimal, so the engine was not seeing any appreciable knock.
Boost is regulated by the ECU. The MAP & MAF sensors (Mainfold Absolute Pressure & Air Flow Sensors respectively) allow the ECU to do this regardless of the exhaust.
The Maxim Racing manifold from Power Engineering is the only _EQUAL-LENGTH_ product mentioned so far. The other version are not - 2 pipes are shorter than the others. Equal lengths equals better resonance - the exhaust gases are effectively sucked out of the cylinders at resonance - check the dyno runs on my site and look at the midrange torque.
The exhaust note is quieter because the pressure waves from each cylinder travel down the exhaust in an evenly distributed fashion. With a non-equal length manifold, the pressure waves collide at certain RPMs, hence the boominess. It really is much quieter! The exhaust nore is higher pitched, but less boomy. Perhaps the manifold makes a standard exhaust louder, since it damps the lower frequencies better, and you don't hear them anyway.
As for fitting to an STI, I have been told that the improvements are just as good for these higher spec cars. Speak to Mervin Carroll at Power Engineering - he dyno tests them all the time, and seriously impressed me with his knowledge.
Is PPP Prodrive Performance Pack ? If so...These upgrades only change the back box on the exhaust system, so fitting a manifold isn't going to involve removing any of your prior investment. Check with PE about performance, but I'm pretty sure you'll still get +20 BHP - I know it seems hard to believe, but it does work wonders.
Regs.
Steve
My car peaked at 14.5 PSI of boost and held 13PSI. The guys at PE attached an OBD monitoring unit to the car during the run. The car was still running a healthy 10% CO, so the fuelling is nowhere near it limits yet. Retardation was also minimal, so the engine was not seeing any appreciable knock.
Boost is regulated by the ECU. The MAP & MAF sensors (Mainfold Absolute Pressure & Air Flow Sensors respectively) allow the ECU to do this regardless of the exhaust.
The Maxim Racing manifold from Power Engineering is the only _EQUAL-LENGTH_ product mentioned so far. The other version are not - 2 pipes are shorter than the others. Equal lengths equals better resonance - the exhaust gases are effectively sucked out of the cylinders at resonance - check the dyno runs on my site and look at the midrange torque.
The exhaust note is quieter because the pressure waves from each cylinder travel down the exhaust in an evenly distributed fashion. With a non-equal length manifold, the pressure waves collide at certain RPMs, hence the boominess. It really is much quieter! The exhaust nore is higher pitched, but less boomy. Perhaps the manifold makes a standard exhaust louder, since it damps the lower frequencies better, and you don't hear them anyway.
As for fitting to an STI, I have been told that the improvements are just as good for these higher spec cars. Speak to Mervin Carroll at Power Engineering - he dyno tests them all the time, and seriously impressed me with his knowledge.
Is PPP Prodrive Performance Pack ? If so...These upgrades only change the back box on the exhaust system, so fitting a manifold isn't going to involve removing any of your prior investment. Check with PE about performance, but I'm pretty sure you'll still get +20 BHP - I know it seems hard to believe, but it does work wonders.
Regs.
Steve
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