Supra MKIV Aerotop V8 turbo project
02-25-2008, 04:13 PM
#91
Formula One Spin Doctor
Rennlist Member
Rennlist Member
Its really a matter of back pressure not capability. Of course you can make over 450WHP with a 4' exhaust, I have seen a mate make 750WHP on his straight through 4". At 4" Mr Edgar found 375Kw was acheivable with less that 2psi back pressure. Its really about trying to minimise losses where you can in my opinion. Im running the 3.5" system while NA, and will keep it when turbo charged but run a seperate system for the wastegate... like I did with my 944. I found a 6psi pressure drop in the exhaust when I ran a seperate WG system, from just over 6psi to just under 1psi. Depending on the size I go for the effective size of the total system will be brought up to circa 4.25"-4.5". Im really trying to make 500-600WHP with as little boost as possible 
Hoping for under a bar, and with the exhaust I have planned I should be able to do that with less than 2psi back pressure in the system post turbo.
Hoping for under a bar, and with the exhaust I have planned I should be able to do that with less than 2psi back pressure in the system post turbo.No back pressure , no ear drums
02-26-2008, 04:14 AM
#92
Drifting
Join Date: May 2006
Location: Melbourne
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there is realy no piont descussing exhuast pipe size on a turbo car when you have more than 400 hp any increase in pipe size pays off if not topend in turbo response . you will always run out of space . Also it seems that it doesnt make much difference were the smallest part is it just matters how small and how long that small bit is . . just fill the space available if you still wonder put several joins in it so you can drop half it off
04-20-2008, 01:26 AM
#93
Race Director
Thread Starter
Just a wee update...
Got the spare heads getting some bigger valves in, and decompressed by taking a couple of cc's out. Have flow benched them and picked up 40CFM on the intake and exhaust side. Pretty happy for a backyard garage port job.
Got cometic heads gaskets.
Got an HKS T45 turbo with .72 compressor AR and .90 turbine AR, v-band, twin scroll turbo, and 4" inlet.
Got an intercooler
Next step flip the headers to bring forward for the turbo'ing and drill hole is sump for oil return.
Got the spare heads getting some bigger valves in, and decompressed by taking a couple of cc's out. Have flow benched them and picked up 40CFM on the intake and exhaust side. Pretty happy for a backyard garage port job.
Got cometic heads gaskets.
Got an HKS T45 turbo with .72 compressor AR and .90 turbine AR, v-band, twin scroll turbo, and 4" inlet.
Got an intercooler
Next step flip the headers to bring forward for the turbo'ing and drill hole is sump for oil return.
07-14-2008, 05:09 AM
#97
Race Director
Thread Starter
hmmm there is a video on page 6 I think... thats pretty much as complete as is it... motor in bits for the turbocharging at the moment. Good times.
08-31-2008, 10:20 PM
#99
Race Director
Thread Starter
Mmmmmmm Volk TE37 goodness (7.2kg a rim) and 4 pot big brake kit
Wastegates are mounted, exhaust finished bar a V-band clamp on the way from the US.
IC piping all done just needs to be coated.
ikeya formula traction rods on their way from Hong Kong... ummm next pics will be of it going
Wastegates are mounted, exhaust finished bar a V-band clamp on the way from the US.
IC piping all done just needs to be coated.
ikeya formula traction rods on their way from Hong Kong... ummm next pics will be of it going
09-01-2008, 05:16 AM
#102
Rennlist Member
Mmmmmmm Volk TE37 goodness (7.2kg a rim) and 4 pot big brake kit
Wastegates are mounted, exhaust finished bar a V-band clamp on the way from the US.
IC piping all done just needs to be coated.
ikeya formula traction rods on their way from Hong Kong... ummm next pics will be of it going
Wastegates are mounted, exhaust finished bar a V-band clamp on the way from the US.
IC piping all done just needs to be coated.
ikeya formula traction rods on their way from Hong Kong... ummm next pics will be of it going
Those Volks are nice but I couldn't find any that were wide enough. They're all made narrow so as to lose traction, but nice all the same.
09-01-2008, 09:05 AM
#104
Rennlist Member
I was toying with the idea of 11's and 12's but that was on trackcar. I would have thought 9.5" is too narrow for your project?
How is it going to be changing belts where your turbo is located ? I imagine some pretty serious heat shields going in. Keep us posted. Look forward to the videos.
How is it going to be changing belts where your turbo is located ? I imagine some pretty serious heat shields going in. Keep us posted. Look forward to the videos.
09-01-2008, 04:15 PM
#105
Race Director
Thread Starter
I am planning on running the Porsche 270 wide slicks. So the 9.5 inch wheel is fine. The offsets become a problem much wider sadly... the work emotion XD9's in 10" might have been a better option, but these are so light.