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[Mk2] [Turbo] Water/meth injection
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Tsia




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1995 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Mon Oct 16, 2017 4:13 pm    Post subject: Reply with quote Reply with quote including images

I thought progressive kits only responded to boost level? I.e. you dial in minimum and maximum boost and it just changes the flow accordingly, irrespective of RPM.

Edit: therefore if true, 1.3 bar @ 3500 or 7000rpm will have the same water/meth injection, even with progressive?
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jimGTS
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1997 Toyota MR2 Mk2 Turbo Rev4

PostPosted: Mon Oct 16, 2017 4:33 pm    Post subject: Reply with quote Reply with quote including images

shinny wrote:
jimGTS wrote:
unless you have progressive BOOST, then no its not valid.

once you hit 1.3bar, it injects the same amount, no matter at 3k rpm or 7k rpm.
so no its not the same as fuel injectors.


But 1.3bar boost at 3500rpm is only consuming air at half the rate as 1.3bar at 7000rpm. So if you're injecting the same rate of water/meth for both then you're actually injecting twice as much per cylinder stroke at the lower RPM than at the higher rpm... right? Or are non-progressive kits still reading the engine RPM and reacting to that?


not injecting twice as much, just ingesting the same amount much more quickly?
very few kits, if any (i havent done a search), inject based on rpm.
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Tsia




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1995 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Mon Oct 16, 2017 6:05 pm    Post subject: Reply with quote Reply with quote including images

And one more question - what sort of cc/min nozzles are you guys running? With the AEM kits I'm seeing an option of 250, 500 or 1000 and haven't the foggiest which I'd need to use.
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shinny
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1994 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Mon Oct 16, 2017 9:53 pm    Post subject: Reply with quote Reply with quote including images

jimGTS wrote:
shinny wrote:
jimGTS wrote:
unless you have progressive BOOST, then no its not valid.

once you hit 1.3bar, it injects the same amount, no matter at 3k rpm or 7k rpm.
so no its not the same as fuel injectors.


But 1.3bar boost at 3500rpm is only consuming air at half the rate as 1.3bar at 7000rpm. So if you're injecting the same rate of water/meth for both then you're actually injecting twice as much per cylinder stroke at the lower RPM than at the higher rpm... right? Or are non-progressive kits still reading the engine RPM and reacting to that?


not injecting twice as much, just ingesting the same amount much more quickly?
very few kits, if any (i havent done a search), inject based on rpm.


I've not really investigated injection kits, so I'm just thinking it through. My point is, however, that given a constant injection rate and a constant boost, the amount of water/meth actually in the cylinder during a single ignition decreases as the RPM increases.
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Dale_V




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PostPosted: Tue Oct 17, 2017 10:29 am    Post subject: Reply with quote Reply with quote including images

shinny wrote:
jimGTS wrote:
shinny wrote:
jimGTS wrote:
unless you have progressive BOOST, then no its not valid.

once you hit 1.3bar, it injects the same amount, no matter at 3k rpm or 7k rpm.
so no its not the same as fuel injectors.


But 1.3bar boost at 3500rpm is only consuming air at half the rate as 1.3bar at 7000rpm. So if you're injecting the same rate of water/meth for both then you're actually injecting twice as much per cylinder stroke at the lower RPM than at the higher rpm... right? Or are non-progressive kits still reading the engine RPM and reacting to that?


not injecting twice as much, just ingesting the same amount much more quickly?
very few kits, if any (i havent done a search), inject based on rpm.


I've not really investigated injection kits, so I'm just thinking it through. My point is, however, that given a constant injection rate and a constant boost, the amount of water/meth actually in the cylinder during a single ignition decreases as the RPM increases.


yup

or if you want to look at it from the other way... is too much before the rpm increases [Shhh]
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androo007
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PostPosted: Tue Oct 17, 2017 5:51 pm    Post subject: Reply with quote Reply with quote including images

I use a 500 cc nozzle. Light mist at 8psi and full spray at 20psi+

There are progressive kits but cost a lot but imo would only get if I was mapping with safeguards etc. I just have it fo safety.


It reduces torque a little and power in reality......but worth it as a safety net.
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Tsia




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PostPosted: Tue Oct 17, 2017 6:25 pm    Post subject: Reply with quote Reply with quote including images

Thanks - I'll opt for a 500cc then. Thing is, I'm running 1 bar currently, which I'd like to bump up to 1.2 post WI, so overall it'd be a net gain in power I'd like to think [Smile]
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jimGTS
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PostPosted: Tue Oct 17, 2017 8:18 pm    Post subject: Reply with quote Reply with quote including images

Guides advise on nozzle sizes based on power output.
Not sure of size of mine specifically, but I got the size rated for 300ish hp.
Though I believe Iím running a bit more than that.

Am sure a google youíll find the size you need.
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Dale_V




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PostPosted: Wed Oct 18, 2017 6:25 am    Post subject: Reply with quote Reply with quote including images

I made 20bhp from a 500cc nozzle, it allowed the timing to be advanced a couple of degrees, and that was before I took out some injector fuelling to compensate for the meth richening the map up. that was at 450bhp. increasing the jet to 1000cc didnt give any gains, except waste water/meth.
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androo007
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PostPosted: Mon Oct 23, 2017 9:50 pm    Post subject: Reply with quote Reply with quote including images

Ah so yours is mapped in then dale?

I just have mine for hot days where iat may climb
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