![]() It would certainly reduce the power needed by the blower I had considered swapping the turbo and blower order to reduce the power needed to drive the turbo but i felt the extra restriction on the exhaust (because the turbo would be working harder than it used to) would likely end up making less power, as the exhaust back pressure would then be much higher. I would like to hear any views and comments on my findings so far. The engine itself is built to produce 1000hp 'reliably'. Looking at the RR graphs and data we collected the other day, we monitored the pressure from the turbo and combined total and can clearly see a multiply of the turbo by the blower very close to 2:1 from 1800rpm to 4000rpm but we couldn't control the turbo and it looked like it would have carried on climbing which would have killed the engine or the blower.īecause the engine already had the big turbo and supporting mods to make good power, we hope to see some good figures once the issues are ironed out. I think we're almost there and hope to have it mapped on the larger pulley with the extra wastegate fitted for turbo control. The combined air then goes through a very good intercooler and reduces the final temps to 16c (this is Scotland remember.!) at the plenum. I hope to keep the turbo around 1.5 bar so the outlet temps don't fry the blower seals. The outlet temp of 80c from the turbo at 1.5bar was logged, which is about the limit of the blower seals. Despite this, we saw 460ft/lbs torque and 360hp at 4000 and 2.9bar which confirms there's definatley power to be made! Obvously slowing down the blower will mean the turbo will need to be producing more to reach our goal of 2.5bar total. Space is at a premium so 32mm is the widest i can go and still have a chassis leg. If it doesn't then i have another modification i can do to run a shorter belt on the blower and split the ancilliaries onto 2 separate belts but i'd like to try this again with the reduction in drive frst before i go to the trouble of a re-design of the belt drive. I have a larger pulley (100mm) which i'll be fitting over the weekend and hope the longer wrap around of the belt on the larger pulley and the reduction of the drive ratio should sort out the issue of the drive. It seems the belt starts to jump when the turbo reaches 1.5bar and the drive simply cannot cope with the power needed to increase boost by a factor of 2. I'll have that done by next week RR session so we have control of the turbo boost and can carry on mapping. We also had issues with controlling the turbo boost and decided i need to install another wastegate to allow better control of the boost. The system i have uses a 32mm toothed belt but the length of the belt seems to be an issue as it's stretching and allowing it to jump over the pulley when the turbo spools up. We saw some impressive torque figures but had to cut the session short due to belt slip on the blower pulley when the turbo reached 1.5bar. I have the blower mounted and all pipework finished and finally had her on the rolling road a few days ago. ![]() The blower has a 75mm pulley and the crank 150mm pulley so a ratio of 2:1. The system is compound compression with the turbo feeding the blower. This is the turbo that gave us 650hp previously, but on a 0,63 housing. I'm using a Harrop HTV 1320 blower and the existing turbo which is a hybrid T04Z with 0.82 housing. Twincharging seemed the most sensible option for the car to eliminate the lag and hopefully produce a torque curve with spool much lower in the rev range. The state of tune of the car is such that we were producing around 650hp, but with the big turbo at 2.6bar, lag was always an issue. Some background on this: I have a 1997 Mitsubishi Lancer Evolution 5 which i've used for sprints and hillclimbs in Scotland for a few years now. ![]() I have to say, the thread and contributions from forum users was very good and informative, which gave me a direction to follow for my own twincharger build. Hi guys, i subscribed to this forum because i found the thread (referenced above) on twincharging while doing a Google search for information on this subject. Thread71-174690: twincharging estimated results ![]()
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