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2056 EFI - what is my weakest point
Posted: Sun Aug 21, 2022 11:51 pm
by grueng
Have a 2056 type4 in bay-bus with ms2 EFI.
It runs great, but supposed I got even more hp's from this setup.
Want to find out whats the next step to gain even more.
MS 2 EFI with wasted spark coil
stock type 4 2,0FI plenum and inlet
One modern electronic throttlebody (oversized)
European motorworks type C cam
8,5:1 compression ratio
2.0 heads ported / modified by proffessionals
39 mm inlet valve, stock exhaust valve.
Stock rockers
stock heat-boxes, vintage speed exhaust (up to 150hp) with broad-band lambda.
The map are optiomized on dyno.
Get 82hp at 4600 and 150NM at 2700 (on wheels). I suppose this is close to 100 on engine.
What is the weakest point related to hp here?
-Are the stock 2.0 FI plenum, runners and inlet large enough?
-What about the rockers?
Re: 2056 EFI - what is my weakest point
Posted: Tue Aug 23, 2022 1:16 pm
by grueng
Today I take a look at the intake runners on a 2,1WBX. They have much larger diameter than the runners on 2,0 Type4.
Is it possible I need larger runners when I now have 35% increased horsepower compared to stock 2,0?
Re: 2056 EFI - what is my weakest point
Posted: Wed Aug 24, 2022 1:32 am
by Bruce.m
Have you got a plot of the torque from the dyno?
That might suggest if it’s a flow limitation or something else.
Re: 2056 EFI - what is my weakest point
Posted: Thu Aug 25, 2022 11:33 am
by raygreenwood
As Bruce notes...could be several points of restriction.
The WBX runners are larger as are the 2.0L 914 runners. I also remember that Jake Raby noted long ago that on his 2056's ...the larger 914 runners are almost a requirement. With the larger bus plenum as compared to the 2.0 914 plenum you "may" not need to go to a larger TB. Ray
Re: 2056 EFI - what is my weakest point
Posted: Fri Aug 26, 2022 10:23 am
by Clatter
Do you run the '75-'78 F-pipe type exhaust?
The '72-'74 style flow better.
I'd also try a Thunderbird/CSP/S&S header.
Even though the VST exhaust is advertised at a certain horsepower rating,
It's not an extractor exhaust with a collector, and won't provide the flow a true tuned exhaust would.
Especially in a bus, you want exhaust heat sent out the back and not stacked up into the motor.
Re: 2056 EFI - what is my weakest point
Posted: Fri Sep 30, 2022 12:24 am
by grueng
Bruce.m wrote: ↑Wed Aug 24, 2022 1:32 am
Have you got a plot of the torque from the dyno?
That might suggest if it’s a flow limitation or something else.
Here is the dyno chart
Re: 2056 EFI - what is my weakest point
Posted: Fri Sep 30, 2022 12:26 am
by grueng
raygreenwood wrote: ↑Thu Aug 25, 2022 11:33 am
As Bruce notes...could be several points of restriction.
The WBX runners are larger as are the 2.0L 914 runners. I also remember that Jake Raby noted long ago that on his 2056's ...the larger 914 runners are almost a requirement. With the larger bus plenum as compared to the 2.0 914 plenum you "may" not need to go to a larger TB. Ray
Do you mean the 2,0 914 runners ar larger than 2,0 bus runners?
I use 2,0 bus plenum and runners today.
Re: 2056 EFI - what is my weakest point
Posted: Mon Oct 03, 2022 10:01 am
by raygreenwood
grueng wrote: ↑Fri Sep 30, 2022 12:26 am
raygreenwood wrote: ↑Thu Aug 25, 2022 11:33 am
As Bruce notes...could be several points of restriction.
The WBX runners are larger as are the 2.0L 914 runners. I also remember that Jake Raby noted long ago that on his 2056's ...the larger 914 runners are almost a requirement. With the larger bus plenum as compared to the 2.0 914 plenum you "may" not need to go to a larger TB. Ray
Sorry for the delay in reply. Yes, the 914 2.0 runners are larger than 2.0 bus.
Ray
Do you mean the 2,0 914 runners ar larger than 2,0 bus runners?
I use 2,0 bus plenum and runners today.