New Car Project
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From: Leeds - It was 562.4bhp@28psi on Optimax, How much closer to 600 with race fuel and a bigger turbo?
Graham,
Theres nothing to be had.. been there tried that.
Theres around 1.5kg in the door bar iirc.
David
Theres nothing to be had.. been there tried that.
Theres around 1.5kg in the door bar iirc.
David
Really?OK, I was trying the bar out, the inner skin off, window regs out except for the drivers/pass doors where a manual regulator from an RA would be used.
Plastic 'glass' in all doors (Peanuts knows a good supplier) but keeping the steel door skin to ensure good door seal contact for the road.
Made much progress David?
Must be painted by now.
Graham
Graham - plastic glass in the pillarless Impreza makes for a very rattely experience as they shake themselves silly at speed....never been there of course, it's just what I heard....
Yes, Ive seen some recently on a gutted Cossie at a hillclimb. He had his 'braced' by small dia thin wall tubing which was very effective.
Just thinking to gut my doors and make light rather than messing with glass doors.
Where is Wallis' bloody car?
Has he found a pretty girl at his new place of toil?
Graham
Just thinking to gut my doors and make light rather than messing with glass doors.
Where is Wallis' bloody car?
Has he found a pretty girl at his new place of toil?
Graham
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From: Leeds - It was 562.4bhp@28psi on Optimax, How much closer to 600 with race fuel and a bigger turbo?
I wish, too busy doing work and not having spare time or cash at the moment, soon progress will be made.
Thanks Martin:
I will spend a morning hacking out the inner skin and all the other junk and see what happens, but as David has tried this alread...and bought some plastic doors after, I think this is the way to go really to save the weight.
Graham
I will spend a morning hacking out the inner skin and all the other junk and see what happens, but as David has tried this alread...and bought some plastic doors after, I think this is the way to go really to save the weight.
Graham
Wish I could finally bring myself to gut it David and go plastic everywhere, but I would loose a year with the car off the tracks.
I feel it happening soon though.
Any progress?
Ready to drop the box tonight so in a spanner mood.
I feel it happening soon though.
Any progress?
Ready to drop the box tonight so in a spanner mood.
Thread Starter
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From: Leeds - It was 562.4bhp@28psi on Optimax, How much closer to 600 with race fuel and a bigger turbo?
Right,
Bought two new 38mm external wastegates and two cheap tacky blow off valves..
David
Bought two new 38mm external wastegates and two cheap tacky blow off valves..

David
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From: Leeds - It was 562.4bhp@28psi on Optimax, How much closer to 600 with race fuel and a bigger turbo?
Its all money and time dependant, I need to find more sponsorship
to fund inlet pipework, exhaust pipework, intercoolers, wiring, dyno time, paint, seats, harnesses, fluids...
Or I need to work my **** off, and then on weekends and evenings still try and earn money...
So need to find some time!
to fund inlet pipework, exhaust pipework, intercoolers, wiring, dyno time, paint, seats, harnesses, fluids...Or I need to work my **** off, and then on weekends and evenings still try and earn money...
So need to find some time!
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From: ECU Mapping - www.JollyGreenMonster.co.uk
David,
Do you think there is an advantage in keeping the two banks separate to the turbo?
I assume the turbo exhaust housing has one inlet with the two scrolls in..
The same or similar size turbo I have seen did.. went onto a 5cylinder engine.. boost control with one wastegate on a collector just before the turbo where it bleed exhaust gases mainly off 1 cylinder. I didn't have trouble with boost creap etc. and was able to control the boost with no problems.
Ignoring the crap boost controller problems but wastegate problems were non-existant.
I presume your collector for want of something to call it will meet with the exhaust housing separating the banks but welded to one flange and the gases from each bank lining up with the separate scrolls?
Surely a single wastegate on one bank would be enough to divert gas flow away to control boost? allowing you to free up some cash and space and work welding up exhaust pipework? The second wastegate will impeed flow unnessarily when wastegates are closed? also boost control will be more complicated with two wastegates?
just thoughts..
Simon
Do you think there is an advantage in keeping the two banks separate to the turbo?
I assume the turbo exhaust housing has one inlet with the two scrolls in..
The same or similar size turbo I have seen did.. went onto a 5cylinder engine.. boost control with one wastegate on a collector just before the turbo where it bleed exhaust gases mainly off 1 cylinder. I didn't have trouble with boost creap etc. and was able to control the boost with no problems.
Ignoring the crap boost controller problems but wastegate problems were non-existant.
I presume your collector for want of something to call it will meet with the exhaust housing separating the banks but welded to one flange and the gases from each bank lining up with the separate scrolls?
Surely a single wastegate on one bank would be enough to divert gas flow away to control boost? allowing you to free up some cash and space and work welding up exhaust pipework? The second wastegate will impeed flow unnessarily when wastegates are closed? also boost control will be more complicated with two wastegates?
just thoughts..
Simon
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From: Leeds - It was 562.4bhp@28psi on Optimax, How much closer to 600 with race fuel and a bigger turbo?
Simon, theres effectively two seperate entries to the one turbo via one flange, so Yes I think it will make a difference.
The wastegates shouldnt impede flow as they arent at an excessive angle on the collectors..
Paul (zen) uses twin scroll to good results on his car, AndyF also suggested it should work well.. so Ill give it a go
David
The wastegates shouldnt impede flow as they arent at an excessive angle on the collectors..
Paul (zen) uses twin scroll to good results on his car, AndyF also suggested it should work well.. so Ill give it a go

David
Bad thoughts!
Twin scroll turbos work far better for response, the turbo is big enough for power, so we need response.
With a totally divided manifold, putting a WG on one bank will result in unbalanced flow on boost, meaning there will be one pair of cylinders running lean, not good.
The flange is divided too.
Paul
Twin scroll turbos work far better for response, the turbo is big enough for power, so we need response.
With a totally divided manifold, putting a WG on one bank will result in unbalanced flow on boost, meaning there will be one pair of cylinders running lean, not good.
The flange is divided too.
Paul
Originally Posted by Jolly Green Monster
David,
Do you think there is an advantage in keeping the two banks separate to the turbo?
I assume the turbo exhaust housing has one inlet with the two scrolls in..
The same or similar size turbo I have seen did.. went onto a 5cylinder engine.. boost control with one wastegate on a collector just before the turbo where it bleed exhaust gases mainly off 1 cylinder. I didn't have trouble with boost creap etc. and was able to control the boost with no problems.
Ignoring the crap boost controller problems but wastegate problems were non-existant.
I presume your collector for want of something to call it will meet with the exhaust housing separating the banks but welded to one flange and the gases from each bank lining up with the separate scrolls?
Surely a single wastegate on one bank would be enough to divert gas flow away to control boost? allowing you to free up some cash and space and work welding up exhaust pipework? The second wastegate will impeed flow unnessarily when wastegates are closed? also boost control will be more complicated with two wastegates?
just thoughts..
Simon
Do you think there is an advantage in keeping the two banks separate to the turbo?
I assume the turbo exhaust housing has one inlet with the two scrolls in..
The same or similar size turbo I have seen did.. went onto a 5cylinder engine.. boost control with one wastegate on a collector just before the turbo where it bleed exhaust gases mainly off 1 cylinder. I didn't have trouble with boost creap etc. and was able to control the boost with no problems.
Ignoring the crap boost controller problems but wastegate problems were non-existant.
I presume your collector for want of something to call it will meet with the exhaust housing separating the banks but welded to one flange and the gases from each bank lining up with the separate scrolls?
Surely a single wastegate on one bank would be enough to divert gas flow away to control boost? allowing you to free up some cash and space and work welding up exhaust pipework? The second wastegate will impeed flow unnessarily when wastegates are closed? also boost control will be more complicated with two wastegates?
just thoughts..
Simon
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From: Leeds - It was 562.4bhp@28psi on Optimax, How much closer to 600 with race fuel and a bigger turbo?
Plan is also to have some decent thermocoupes in each port too.. and also one in the downpipe
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From: ECU Mapping - www.JollyGreenMonster.co.uk
Originally Posted by Zen Performance
Bad thoughts!
Twin scroll turbos work far better for response, the turbo is big enough for power, so we need response.
With a totally divided manifold, putting a WG on one bank will result in unbalanced flow on boost, meaning there will be one pair of cylinders running lean, not good.
The flange is divided too.
Paul
Twin scroll turbos work far better for response, the turbo is big enough for power, so we need response.
With a totally divided manifold, putting a WG on one bank will result in unbalanced flow on boost, meaning there will be one pair of cylinders running lean, not good.
The flange is divided too.
Paul
I know what you mean about a twin scoll responding well etc.. but is it really going to gain much having the banks separated?
I assume you have on your car Paul?
Just an interesting subject..
I suppose with twin scroll with a bank on each scroll then pulse wise at least one of the scrolls has a pulse pretty much at any time.. with them into a collector then both scolls would have a pluse at any one time.. but slower gas speed I guess.. so probably does make sense to keep them separate then..

Simon
Last edited by Jolly Green Monster; Dec 14, 2006 at 09:25 AM.
Both David and I have already pointed out the very divided nature of the twin scroll setup. Having a common collector completely defeats the object of doing it.
CAN'T YOU READ SIMON?!!?!
Must be near to christmas and you're getting too excited.
paul
CAN'T YOU READ SIMON?!!?!
Must be near to christmas and you're getting too excited.

paul
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From: Leeds - It was 562.4bhp@28psi on Optimax, How much closer to 600 with race fuel and a bigger turbo?
It moves...
If you push it... now has 4 drift wheels and tyres on thanks to ScoobyBits | Subaru Specialists // New & Used Parts // Repairs & Servicing (space savers!)
It has rear diff and suspension kind of mounted now (trailing arm's need the nuts rewelding and attaching properly.
Bonnet is sat in place..
Garage has been swept
If you push it... now has 4 drift wheels and tyres on thanks to ScoobyBits | Subaru Specialists // New & Used Parts // Repairs & Servicing (space savers!)
It has rear diff and suspension kind of mounted now (trailing arm's need the nuts rewelding and attaching properly.
Bonnet is sat in place..
Garage has been swept



