thanks for the reply John.Now if i'd have looked at the rest of the topic before i'd posted i could have got most of my answers...
Did Richard ever get those centre jet aluminium castings done?
The thing is that injecting into the centre of the turbo on this application would be quite difficult without something of that nature being used.......unless i use a 90deg piece of tubing that turns close to the impeller...then that would restrict the airflow i guess... maybe i'll get my machinist to knock something up...
Btw John,turbo is 10" across on the inlet,cup is normal... :lol:

Red,

How do you find the Holset turbos for spool up and do you think their legendary durability makes them better suited to this type of pre turbo injection?

Paul

I'll tell you when they are running..... I picked Holset for 3 reasons.Firstly they are on a million diesel engines that last forever,and they were able to custom build and size for my application,and they are here in the UK........
IMO the 360deg bearing that is in these turbos is so much more durable than any roller bearing.It's force fed with a constant oil supply for starters.

how is the car getting on ? Are you still injecting pre turbo ?

Scott

I was a bit wary of posting this since this is a water injection specific thread, but this is something very relevant to me so I wanted to ask you guys since you are very knowledgeable.

I have in my possession a propane injection kit that was put together for me by a very well known injection specialist best known for their nitrous systems.

Having read through this thread I was wondering how effective it would be to inject propane pre turbo. Injected as a liquid under pressure it would turn gaseous 'instantly' especially since it boils at less than zero (centigrade). Whilst it may not offer much cooling as a result, it would consequently have no opportunity to condense in the intercooler, would offer a denser air mixture at the turbo, increase octane content, would not interfere with a hotwire MAS in blow through and could theoretically be used in tandem with water/methanol injection at the throttle body.

What do you guys think?

That's not a bad idea. Anyone else want to comment on that?

Propane is normally injected as a gas once it leaves the nozzle (restrictor). Almost turns to gas instantly due to pressure drop on the other side of the orifice.

Propane in gaseous form has little or no coolng effect. The resultant charge temperature will be the ratio of propane mass and air mass. Since you will not be injecting a huge amount of propane relative to air (mass% <10P/90A), the drop in charge air temperature is not that great - most people are reading into the marketing hype too much.

The flash point is at its most explosive when the A/P mixture is at around stoichometic and feeding the mixture pass a hot wire sensor can be risky. I am not an expert on this but I would ask the propane injection specialist first before implementing the set up on your car.

Richard

This article towards the end mentions pre-compressor injection considered for hypersonic planes of the future. :lol:

http://www.afa.org/magazine/dec2003/1203spaceplane.asp

I guess we're on the right track, eh?

Excellent find.

I will gibve them a call :lol:

This is some very interesting reading.