One of my goals to keep true to in building on this project car is to use prefab parts, and fabricate as little as possible to save time on sorting out what works and what does not.. for me time is more valuable than keeping a low budget.
I have done minor modifications to adapt parts.. added a barb here and there and cut the lengths of pipes/hoses and such.. other than that it is strictly a composition of bolton parts. |
Welcome! Good to see another outside-the-box project that made it passed the sniffing-butt phase.
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Originally Posted by Ted75zcar
(Post 1576633)
Welcome! Good to see another outside-the-box project that made it passed the sniffing-butt phase.
I had a minor setback with my turbo today.. the impeller seems to be stuck.. but i guess it's one of the two.. either the lump of meat holding the wrench (me) f*cked it up.. mounting.. (but still with purchase parts including oil feed lines and everything) or this turbo was at fault from the get go.. Either way.. now to troubleshoot and then call the turbo supplier for some discussions on how to get a turbo in the car again.. :D Everything cannot be success all the time so why not a little bit of challenges.. |
Glad there's an English version of a build thread for the car now!
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This expired token thing on this forum drives me crazy..
Here i go again.. Tore down turbo setup today, did some tests.. found the culprit.. it was thread tape leftovers that was stuck in the hole from the plug i used and put there 1,5 years ago.. tomorrow i will talk with the turbo shop about what to do next.. here.. pictures.. https://cimg7.ibsrv.net/gimg/www.mia...bb19a3db8c.jpg Culprit https://cimg8.ibsrv.net/gimg/www.mia...c2d6cc0759.jpg Hungry feed line.. |
I want to share another tip i got today:
The ports on the sandwhich gives unfiltered oil, so do not use them as a feed. Rather use the traditional t-solution at the pressure-sensor |
Ouch! Well at least you have found the problem. Perhaps this was also causing the late spool on the turbo.
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Originally Posted by oreo
(Post 1576741)
Ouch! Well at least you have found the problem. Perhaps this was also causing the late spool on the turbo.
Now i will see what they say.. i don't think they will be able to restore/fix it.. perhaps to much damage to things.. and if it is so.. i will try to order a gtx2860r instead.. to broaden my torque-curve a little like i intended to do from the beginning.. |
An 0.86 AR hotside 2871 will not spool below 4k on a 1.8. At 5280 ft altitude an 0.86 ar hotside gtx2867R spools at 5000-5200. A 0.64 is around 4500. At sea level these numbers will reduce by ~12-15%.
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Originally Posted by Ted75zcar
(Post 1576750)
An 0.86 AR hotside 2871 will not spool below 4k on a 1.8. At 5280 ft altitude an 0.86 ar hotside gtx2867R spools at 5000-5200. A 0.64 is around 4500. At sea level these numbers will reduce by ~12-15%.
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Yeah, at 5-6 psi I would expect the spool to go down ~30% for a turbo not riding the compressor surge line.
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There certainly should be.
The supercharger creates more exhaust flow, and the turbo helps fill the blower rotors. They should help each other, and pressure ratios multiply not add. It may require a smaller turbine housing, and/or a smaller supercharger pulley, but both are fairly easy to change. |
Originally Posted by Ted75zcar
(Post 1576753)
Yeah, at 5-6 psi I would expect the spool to go down ~30% for a turbo not riding the compressor surge line.
Originally Posted by Warpspeed
(Post 1576754)
There certainly should be.
The supercharger creates more exhaust flow, and the turbo helps fill the blower rotors. They should help each other, and pressure ratios multiply not add. It may require a smaller turbine housing, and/or a smaller supercharger pulley, but both are fairly easy to change. Of course, please correct me if i am wrong!.. i am really just a novice in this field.. ! |
Unfortunately, with a super-turbo, I don't think you get a compound effect. Increasing the PR across the turbo decreases the PR across the SC. That said, you are correct, the SC does provide a pseudo displacement multiplier from an exhaust energy perspective.
The SC is still a win, and you are not limited to a lower total PR by the SC like you would be with a compounding turbo-super. |
I intentionally ride the surge line, it is why I run an 0.64 hotside and what makes the gtx2867r gen 2 a fantastic turbo for my application.
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Originally Posted by Ted75zcar
(Post 1576756)
Unfortunately, with a super-turbo, I don't think you get a compound effect. Increasing the PR across the turbo decreases the PR across the SC. That said, you are correct, the SC does provide a pseudo displacement multiplier from an exhaust energy perspective.
The SC is still a win, and you are not limited to a lower total PR by the SC like you would be with a compounding turbo-super. Twincharged is more exciting though.. and challenging.. and odd :D |
Originally Posted by Ted75zcar
(Post 1576757)
I intentionally ride the surge line, it is why I run an 0.64 hotside and what makes the gtx2867r gen 2 a fantastic turbo for my application.
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I have built several of these turbo/blower compound systems over the years, and as Ted says, the supercharger multiplies engine capacity as far as the turbo goes.
The turbo does not "know" the engine is supercharged, it just sees flow. So if you add a supercharger run at a drive ratio that provides for example a 1.5 density ratio, a 1.86 Litre engine looks like a 2.79 Litre engine to the turbo. Now maybe a 2.79 Litre engine (or whatever it works out to be) is still not big enough to spool the turbine you have. So you get two choices, drive the blower faster, or reduce the turbine A/R. The whole thing needs to build up enough flow to the point where the turbo can begin to work, otherwise not much is going to happen. It certainly does compound, and spectacularly so. The most noticeable effect is how rapid boost can build, especially in the lower gears, and the absence of lag. Its almost working, but not quite yet. |
Originally Posted by Warpspeed
(Post 1576760)
I have built several of these tubo/blower compound systems over the years, and as Ted says, the supercharger multiplies engine capacity as far as the turbo goes.
The turbo does not "know" the engine is supercharged, it just sees flow. So if you add a supercharger run at a drive ratio that provides for instance a 1.5 density ratio, a 1.86 Litre engine looks like a 2.79 Litre engine to the turbo. Now maybe a 2.79 Litre engine (or whatever it works out to be) is still not big enough to spool the turbine you have. So you get two choices, drive the blower faster, or reduce the turbine A/R. The whole thing needs to build up enough flow to the point where the turbo can begin to work, otherwise not much is going to happen. |
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