DJ Wilmas 111S S2 T series 400bhp Elise
Discussion
OK results are in and dont know whether to be happy or sad.......i should be happy looking at the curve, i really really should be
Anyway.......
It’s a mixed bag of news
The engine wanted to boost, way above the 11psi set in the actuator. So the dyno removed one of the two springs and got this down to 20psi. The spring should set actuator pressure to 4psi so need to find out why this is happening.
It may be connected to the vacuum pump, this was disconnected and open to atmosphere and caused the crankcase to pressurise. Once disconnected, or sealed up, the engine was fine. Took a while to find out why but hey ho its not been done before.
Weirdly the std gdi injection was ok at 410bhp, auxillary wasnt needed (was tested and wasnt great when injects as the injector opens to much for the need) but does work if needed. Theory is 350wbhp so 400bhp is the limit, which its not as they still had some headroom.
But the major issue was detonation, at 20psi (1.4bar) the sensors were detecting knock, so the ignition was retarded to a point where the egt's got too high......This though should not happen, inlet temps were 30C so even if the compressor was blowing hot air (which its not according to the comp curve) this shouldnt effect detonation.
A theory, which i need to confirm, is that the pistons are higher than the 9.3:1 they should be. This is because i used the 2.3 crank and rods, and the 2.0 pistons. The std 2.0 and 2.3 have the same comp ration, so longer stroke and short rod should ,ake the same as they share (i hope i am right) the same piston diameter. However, the 2.3 and the 2.0 use different heads so i dont know if the volumes change to compensate.
As is normal here Dyno session finished late, so i will get more information tomorrow.
So it may 410bhp, 300lbft at 3000rpm and 350lbft of torque with a flat chunky curve with lots of room under the curve.
So i should be happy, right
Anyway.......
It’s a mixed bag of news
The engine wanted to boost, way above the 11psi set in the actuator. So the dyno removed one of the two springs and got this down to 20psi. The spring should set actuator pressure to 4psi so need to find out why this is happening.
It may be connected to the vacuum pump, this was disconnected and open to atmosphere and caused the crankcase to pressurise. Once disconnected, or sealed up, the engine was fine. Took a while to find out why but hey ho its not been done before.
Weirdly the std gdi injection was ok at 410bhp, auxillary wasnt needed (was tested and wasnt great when injects as the injector opens to much for the need) but does work if needed. Theory is 350wbhp so 400bhp is the limit, which its not as they still had some headroom.
But the major issue was detonation, at 20psi (1.4bar) the sensors were detecting knock, so the ignition was retarded to a point where the egt's got too high......This though should not happen, inlet temps were 30C so even if the compressor was blowing hot air (which its not according to the comp curve) this shouldnt effect detonation.
A theory, which i need to confirm, is that the pistons are higher than the 9.3:1 they should be. This is because i used the 2.3 crank and rods, and the 2.0 pistons. The std 2.0 and 2.3 have the same comp ration, so longer stroke and short rod should ,ake the same as they share (i hope i am right) the same piston diameter. However, the 2.3 and the 2.0 use different heads so i dont know if the volumes change to compensate.
As is normal here Dyno session finished late, so i will get more information tomorrow.
So it may 410bhp, 300lbft at 3000rpm and 350lbft of torque with a flat chunky curve with lots of room under the curve.
So i should be happy, right
Toltec said:
Looks like you should get over 300bhp through the gears so I suspect it will be quite quick
Realistically what speed/gear will you be happy not to be be able to spin the wheels at?
with that curve it will be rapid yes, but its still not quite thereRealistically what speed/gear will you be happy not to be be able to spin the wheels at?
Car had 400 plus bhp with the engine before and i never had traction issues. Mainly as its fitted with 4 wheel traction control
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