What's the most boost used
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- Posts: 422
- Joined: Tue Apr 01, 2014 1:26 am
Re: What's the most boost used
The only difference in small vs large turbo is heat?
Pressure is pressure, so there is no more air volume with a big turbo.
My “small” 57mm old Garret was backed up by a huge ice water intercooler to fix the heat issue..
New “big” 57mm turbo should run a lot cooler, and the IC core is the same..
Pressure is pressure, so there is no more air volume with a big turbo.
My “small” 57mm old Garret was backed up by a huge ice water intercooler to fix the heat issue..
New “big” 57mm turbo should run a lot cooler, and the IC core is the same..
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2165cc on a Borg Warner S257 SXE, DTA S60 on E85.
Boost was created only to make people smile, and make power!
10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018
2165cc on a Borg Warner S257 SXE, DTA S60 on E85.
Boost was created only to make people smile, and make power!
10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018
- Wally
- Posts: 4563
- Joined: Mon Oct 28, 2002 12:01 am
Re: What's the most boost used
Euh... no and...no (sorry)
This is also in reply of previous question/remark by Ruben regarding the benefits of a bigger turbo:
- a big turbo is much more kind for the engine as boost at low RPM (small turbo's) is much harder on engines and gearboxes.
- 25psi seems the same as 25psi, but from the engine's point of view (the topic we discussed) its not really: the difference of course being backpressure! Small turbo's usually have smaller turbine housing, so the same 25psi with 25 psi backpressure of 50 psi backpressure (yes, you have those) makes all the difference! Thats also where the extra 'heat' is coming from in those two examples. High back pressure gives more heat on your exhaust valves, deliveres LESS horsepower and raises temps in general. Yes, you get a bit quicker spool, but not all aircooled engines can take that..
In summery, you forgot the turbine side in all this.
Imho turbine side may even be more impotant then compressor side, which we usually focus the most on. Thats also part why I love Borg Warner airresearch turbo's over Garrets: Garrets always have (had) relatively small turbine wheels and they are only just recently - with their new line of turbo's -'catching up' on BW in that aspect. Thats a huge part of the the physical reason why your new BW will run cooler then your same (compressor)sized old Garret and make more power at the same boost.
But...thats all just my opinion of course .
T4T: 2,4ltr Type 4 Turbo engine, 10.58 1/4 mi
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
www.apfelbeck.nl
"Mine isn't turbo'd to make a slow engine fast, but to make a fast engine insane" - Chip Birks
- rubenski
- Posts: 2033
- Joined: Mon Jun 30, 2014 3:28 am
Re: What's the most boost used
I'm not a pro in that kind of knowledge. It was just a logical assumption.
(At least in my head it sounded logic)
Verstuurd vanaf mijn SM-A515F met Tapatalk
(At least in my head it sounded logic)
Verstuurd vanaf mijn SM-A515F met Tapatalk
Better to be blown than to suck!
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- Posts: 422
- Joined: Tue Apr 01, 2014 1:26 am
Re: What's the most boost used
Yes, I was talking about the intake side. 97.2% of us just measure that pressure side..
Back pressure and strain on the engine “from that side” is of course a whole new side of the boost coin.
Back pressure and strain on the engine “from that side” is of course a whole new side of the boost coin.
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2165cc on a Borg Warner S257 SXE, DTA S60 on E85.
Boost was created only to make people smile, and make power!
10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018
2165cc on a Borg Warner S257 SXE, DTA S60 on E85.
Boost was created only to make people smile, and make power!
10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018
- buguy
- Posts: 6209
- Joined: Wed Jan 26, 2005 8:53 pm
Re: What's the most boost used
I think I'm going to put a sensor on each side and log some measurements.
And maybe a temp sensor before the intercooler too so i have that data as well.
And maybe a temp sensor before the intercooler too so i have that data as well.
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- Posts: 422
- Joined: Tue Apr 01, 2014 1:26 am
Re: What's the most boost used
I added a pre intercooler bung for IAT. Just to see how effective the double chinese intercooler is.
Should probably also do a back pressure gauge.
Should probably also do a back pressure gauge.
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2165cc on a Borg Warner S257 SXE, DTA S60 on E85.
Boost was created only to make people smile, and make power!
10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018
2165cc on a Borg Warner S257 SXE, DTA S60 on E85.
Boost was created only to make people smile, and make power!
10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018
- buguy
- Posts: 6209
- Joined: Wed Jan 26, 2005 8:53 pm
Re: What's the most boost used
Back pressure sensor would be interesting.
- richie,uk
- Posts: 353
- Joined: Sun Jun 16, 2002 12:01 am
Re: What's the most boost used
Mag case 4 studs per cylinder[normal "thin wall" 94mm cylinders] & regular UK available petrol max 26psi with water to air intercooler in my 1303 road car, yes it could probably go higher but it is already just about undrivable on full boost on normal roads!!!
The other street car has seen well into 40psi range on track with better fuel
The other street car has seen well into 40psi range on track with better fuel
- richie,uk
- Posts: 353
- Joined: Sun Jun 16, 2002 12:01 am
- Chip Birks
- Posts: 4006
- Joined: Wed Mar 12, 2008 5:59 pm
Re: What's the most boost used
I did this a few years ago, got some pretty cool data. Back pressure, temp before and after intercooler. I have a recipe for back pressure sensor stuff if interested. Part numbers and sources and such.
- buguy
- Posts: 6209
- Joined: Wed Jan 26, 2005 8:53 pm
Re: What's the most boost used
I am definitely interested. I need to get my car back on the road though! I'm getting some bad ideas with all this down time! I only have 15 miles on this engine, i can't be replacing stuff already! Luckily i have a 4 day weekend next week so i hope to bang out a lot of it. My wife had knee surgery last Friday, so i had to sit home all last weekend. Way behind. I did manage to take a few minutes after work one day and got half of the rear apron cut free. Only 150 more spot welds to drill to get the other side free.
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- Posts: 422
- Joined: Tue Apr 01, 2014 1:26 am
Re: What's the most boost used
Do you question the dyno, or mock the driver?
Yes. 501whp and 667wnm.
As you can see, the turbo is out of breath, and the peak rpm drops when applying more boost.
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2165cc on a Borg Warner S257 SXE, DTA S60 on E85.
Boost was created only to make people smile, and make power!
10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018
2165cc on a Borg Warner S257 SXE, DTA S60 on E85.
Boost was created only to make people smile, and make power!
10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018
- buguy
- Posts: 6209
- Joined: Wed Jan 26, 2005 8:53 pm
Re: What's the most boost used
Am i misreading it, or does that say 368hp? Which to me is still impressive!
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- Posts: 422
- Joined: Tue Apr 01, 2014 1:26 am
Re: What's the most boost used
kW
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2165cc on a Borg Warner S257 SXE, DTA S60 on E85.
Boost was created only to make people smile, and make power!
10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018
2165cc on a Borg Warner S257 SXE, DTA S60 on E85.
Boost was created only to make people smile, and make power!
10.626 @ 132mph SCC2016
10.407 @ 134mph SCC2017
10.221 @ 135mph SCC2018