Ct9 Hybrid
- Thread starter GT*star
- Start date
Toplap
Lifer
I see Dave's point in all this, though i have known quite a few turbo builders/experienced ppl here locally that have had a lot of success with sticking with the standered turbine when creating a hybrid set up.....though none on CT-9's. Id like to see actual proofs of both theory's, but unfortunately that would require having both turbo's on the exact same car, the same day, location etc etc etc
Dave does have a point, but he is wrong.
Because with the standard turbine can hold 1.2bar fine and you won't need anymore boost than that so your just increasing lag.
Also there is the issue with it being very expensive to modify in this way as there are no easy options. I think dave will tell you the hybrid he has isn't economical to build, his i believe was kind of an experiment and a favour if i remember correctly.
Because with the standard turbine can hold 1.2bar fine and you won't need anymore boost than that so your just increasing lag.
Also there is the issue with it being very expensive to modify in this way as there are no easy options. I think dave will tell you the hybrid he has isn't economical to build, his i believe was kind of an experiment and a favour if i remember correctly.
TurboDave
Member +
Yes you are correct although less resistance to the flow by having a bored turbine housing and a larger wheel does make a massive difference and I know because I have experienced it first hand with my Turbos so I am not wrong. Also in my case it has not increased lag it has in fact decreased it due to the size and design of the exducer on the turbine wheel sucking and scavenging the exhaust gasses out which in turn helps to accelerate the wheel and help it come on boost.
A factor to also consider is the effect the small turbine wheel and restrictive wheel housing will have on temperature as the gasses are forced through it.
When I get mapped next month ill stick my Dyno up and you can see when I get 1.2 bar (before 2600rpm).
TurboDave
Member +
Yes but the original question was that the huge compressor wheel on the hybrid in question would work much more efficently if it could effectivly remove the extra air it sucks in and expell it through a larger turbine wheel and machined housing.
I have got some ideas now, stupid turbos I was happy until this afternoon I want a bigger compressor wheel now and a bigger again turbine wheel!
I have got some ideas now, stupid turbos I was happy until this afternoon I want a bigger compressor wheel now and a bigger again turbine wheel!
I think on your turbo the machining is what is helping rather than the larger turbing as the smaller it is the quicker it spools also the actual design of your turbine wheel is probably better the fins are probably cut back more and maybe more of them. Plus you aren't getting any gain at top end because you aren't going to high enough boost too make a difference.
TurboDave
Member +
I am running 1.3 bar thats plenty high enough.
You dont seem to be accepting that the larger turbine wheel does not decrease spool time in my case because the wheel scavenges the exhaust gasses better and is able to expell them more efficently than a smaller wheel.
How can you possibly claim I am not getting any top end gain when I know fully well I have?
You dont seem to be accepting that the larger turbine wheel does not decrease spool time in my case because the wheel scavenges the exhaust gasses better and is able to expell them more efficently than a smaller wheel.
How can you possibly claim I am not getting any top end gain when I know fully well I have?
TurboDave
Member +
Have you been drinking earlier your posts made sense but now they are a bit iffy ?
If the exhaust gasses can escape the turbo faster through the turbine housing then there is an increase in top end power, Cut backs on the turbine wheels (clips) help top end power aswell, as there is less resistance for the exhaust gasses on their way out. I cant go into depth now because it is late and I need my Beauty sleep but I will happily explain it all tomorrow.
Dave
?If the exhaust gasses can escape the turbo faster through the turbine housing then there is an increase in top end power, Cut backs on the turbine wheels (clips) help top end power aswell, as there is less resistance for the exhaust gasses on their way out. I cant go into depth now because it is late and I need my Beauty sleep but I will happily explain it all tomorrow.
Dave
Guye
Lifer
@TurboDave your turbo sounds fantastic! I am wondering if you don't mind telling which part of it is still the orginal ct9. I'm guessing the housing and internals are stock but modified, but the business ends (turbine & compressor wheels) are both changed? Your turbo seems to have more put into it than what I would call your typical hybrid. Are you developing such units for sale by any chance?