400whp turbo setup from NZ
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Re: 400whp turbo setup from NZ
and to what revs will the kit run to ?
as personally I'll fight to the death to defend my 9000 rpm capabilty
as personally I'll fight to the death to defend my 9000 rpm capabilty
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Re: 400whp turbo setup from NZ
Well ...it would run to 9000 if I wasn't doing the tuning. If I do the tuning, I'd be cutting you off at 8500 at least ...maybe lower. There are a few good reasons for this.
If a 9000 rev limit and going slow is what you want ... don't turbo it
FWIW I own an N/A (220whp) and a turbo (415whp) RX8. I also do a lot of windy road driving as well as track days. I pretty much never drive the N/A fast anymore ...it's just for cruising. It actually feels like hard work to drive it fast because you have to keep the revs so high to get anywhere. The turbo on the other hand just begs to go fast , it's almost relaxing to go at a pace the N/A would find impossible (while not doing more than 6500rpm). Maybe it's just me getting older ... :dunno:
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Re: 400whp turbo setup from NZ
With that rev limit the motor should get older with you!
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Re: 400whp turbo setup from NZ
for me the 9000rpm is a large part of the engines appeal, so it's a shame to lose that ceiling
what are your reasons for limiting the rpm? is it just to help seal life ?
what I'm getting at is there's no reason why the turbo shouldn't still work at those rpm but I do understand why limiting the rpm is good ide on an otherwise stock engine once boosted
what are your reasons for limiting the rpm? is it just to help seal life ?
what I'm getting at is there's no reason why the turbo shouldn't still work at those rpm but I do understand why limiting the rpm is good ide on an otherwise stock engine once boosted
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Re: 400whp turbo setup from NZ
I suspect that peak power, and definitely peak torque, is reached at a much lower rpm with a turbo.
The Renesis is somewhat exhaust gasflow limited, so this becomes a roadblock as the revs increase.
A turbo engine should produce more power at 9krpm than a NA engine, but it would have already produced its maximum earlier.
Leaving the rev limit at 9k therefore just increases stress for no power benefit.
If I fitted a turbo I'd also consider swapping to the 5-speed 'box, as they appear to be more robust and the ratios are probably a better match for the power/torque curve.
The Renesis is somewhat exhaust gasflow limited, so this becomes a roadblock as the revs increase.
A turbo engine should produce more power at 9krpm than a NA engine, but it would have already produced its maximum earlier.
Leaving the rev limit at 9k therefore just increases stress for no power benefit.
If I fitted a turbo I'd also consider swapping to the 5-speed 'box, as they appear to be more robust and the ratios are probably a better match for the power/torque curve.
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- Milos_Balunovic (Mon Jul 12, 2021 12:31 pm)
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Re: 400whp turbo setup from NZ
Firstly , as warpcoil pointed out , the power is dropping away from about 7500 on good setups anyway so there is no gain in doing so. A sign of a poor setup , is that it makes it's power much later. We see this on setups with decent sized turbos but high backpressure from pipework/exhaust/IC etc.
More important is the reason why power drops away, which I believe is due in part to increased exhaust gas carryover from the inability of the ports to expel all the exhaust gas at high mass flows. This leads to added risk of detonation at high rpm.
Lastly the loads on the bearings increase exponentially as rpms increase. The N/A engine is built for N/A loads but when those loads increase the added stress on the bearings at high rpm will wear them out at a much faster rate.
Warpcoil .... agree re the 5 speeed . That's what I've run for years.
More important is the reason why power drops away, which I believe is due in part to increased exhaust gas carryover from the inability of the ports to expel all the exhaust gas at high mass flows. This leads to added risk of detonation at high rpm.
Lastly the loads on the bearings increase exponentially as rpms increase. The N/A engine is built for N/A loads but when those loads increase the added stress on the bearings at high rpm will wear them out at a much faster rate.
Warpcoil .... agree re the 5 speeed . That's what I've run for years.
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Re: 400whp turbo setup from NZ
Bret
You know the car I have
What’s your view on wedging the APV open ?
Cheers Wayne
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You know the car I have
What’s your view on wedging the APV open ?
Cheers Wayne
Sent from my iPhone using Tapatalk
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Re: 400whp turbo setup from NZ
Is your car the one Flameshades built ? I do remember his APVs stopped working at some stage. Wedging them open isn't a great idea . Apart from the low rpm power drop , you get a LOT of blowback into the uim which will heat it up a lot and cause it to clog up over time.
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Re: 400whp turbo setup from NZ
I do have that car , yes .Brettus wrote:Is your car the one Flameshades built ? I do remember his APVs stopped working at some stage. Wedging them open isn't a great idea . Apart from the low rpm power drop , you get a LOT of blowback into the uim which will heat it up a lot and cause it to clog up over time.
But it’s a different kit I’m referring to which has ran like a bag of sh*t since I’ve had it .
It’ll be going to be mapped soon , and it’s cable tied open . So Best cut them off then ?
So asking your opinion
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Re: 400whp turbo setup from NZ
I wouldn't leave them open myself ..... pretty sure there are people that do though. As to how bad the drawbacks are .... I really don't know.
Edit : although ...you just said it runs like a bag of sh*t so ......... that's the first thing I'd do towards getting it running well.
I do remote tuning BTW
Edit : although ...you just said it runs like a bag of sh*t so ......... that's the first thing I'd do towards getting it running well.
I do remote tuning BTW
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- Milos_Balunovic (Mon Jul 12, 2021 12:33 pm)
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Re: 400whp turbo setup from NZ
Prototype cast stainless manifold is done ...... hope to test soon.
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Re: 400whp turbo setup from NZ
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Re: 400whp turbo setup from NZ
like this
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Re: 400whp turbo setup from NZ
Saw this on Facebook, looks like the Renesis engine responds well to Meth
Turbo looks comically large but seems to fit into the engine bayYou do not have the required permissions to view the files attached to this post.
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- 30405 (Sun Jul 11, 2021 8:37 am)
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Re: 400whp turbo setup from NZ
I think you mean it is comically large
my oh my it looks ridiculous still - would be interesting to see how it's done. Then again, it's only 5k miles so you'd damn well hope it's intact
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Re: 400whp turbo setup from NZ
Or to quote the legendary "Banks" air density is all that mattersMadTaz wrote: ↑Mon May 10, 2021 3:57 pm....
For those looking at the boost pressure quoted in PSI, please note that comparing boost pressure from one turbo compressor to the next or even a supercharger is not possible, boost pressure in terms of system power is irrelevant and what matters is Total System Flow not pressure.
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Re: 400whp turbo setup from NZ
That setup was built for a landspeed attempt and doesn't spool up till 6000ish rpm with a 1000rpm power band (so far) . Very cool project but it's the polar opposite to what I'm doing with mine. Not sure why it's posted on this thread ?
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Re: 400whp turbo setup from NZ
The road miles must have been challenging!
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Re: 400whp turbo setup from NZ
Brettus very nice to see you here also. I learned so much from you on other forum you share so much knowledge ect.
Will be nice to see the manifold, I hope it gets to production!
Will be nice to see the manifold, I hope it gets to production!
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Re: 400whp turbo setup from NZ
Probably just putting around with the occasional .... OH [edited] !!!! moment .
Last edited by qwakers on Tue Jul 13, 2021 7:13 am, edited 1 time in total.
Reason: Autocensor dodge
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Re: 400whp turbo setup from NZ
While we're slightly off tangent here...
In the late 1970's I used to moonlight for Gus Kuhn Motorcycles, doing various things behind the scenes for their race workshop.
Originally this was with Norton Commandos but later with BMWs, where they would enter they're own team in Endurance Racing, and prepare bikes for other race customer teams.
It was always fun being given a road-going BMW R90S, with a fully tuned racing engine, some spare oil strapped on the back seat and a fuel card in the back pocket, with orders to put a few hundred miles on it before breakfast the next day.
I can confirm that I would have a few "occasional .... OH !!!! moments" when the engine would come on-cam half way around a greasy roundabout, or when they'd taken the tuning or "adding lightness" too far and an engine seized at a hundred and plenty on the A3
In the late 1970's I used to moonlight for Gus Kuhn Motorcycles, doing various things behind the scenes for their race workshop.
Originally this was with Norton Commandos but later with BMWs, where they would enter they're own team in Endurance Racing, and prepare bikes for other race customer teams.
It was always fun being given a road-going BMW R90S, with a fully tuned racing engine, some spare oil strapped on the back seat and a fuel card in the back pocket, with orders to put a few hundred miles on it before breakfast the next day.
I can confirm that I would have a few "occasional .... OH !!!! moments" when the engine would come on-cam half way around a greasy roundabout, or when they'd taken the tuning or "adding lightness" too far and an engine seized at a hundred and plenty on the A3
Last edited by warpc0il on Tue Jul 13, 2021 11:05 pm, edited 2 times in total.
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Re: 400whp turbo setup from NZ
Cast manifold is installed for testing . Very happy with what I'm seeing so far !
Better spoolup
Zero boostcreep
Good boost control
Great power
Better spoolup
Zero boostcreep
Good boost control
Great power
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Re: 400whp turbo setup from NZ
What’s not to like about that? Well done mate.
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