20bt S2 Rx7

[bernie-rx7]

Never really posted this up before. Has kinda been a little ongoing project of mine for the last couple of years. Done most of the work myself - Now its nearly at the stage where I'll let people have a look. I cant let you know all my secrets but lets just say I'm looking forward to debut at next years summer nats Dyno comp.

Enjoy!

[Zac]

whoa... methanol?
why no intercooler?

[bernie-rx7]

yeah ran a 10' PWR water to air intercooler. found it a little restricting down low seeing as though the exhaust housing is pretty big. So i ripped it off and decided to go methanol injection along the compression pipe and water injection through the turbo. has gained a few ponies. not to say the Water to Air wasn't good just the turbo is quite large.

[Zac]

I see! is that legal (to HP Heroes rules)?

btw, are you injector methanol by engine load or rpm? and what are you using to inject it?

[bernie-rx7]

Using mercedes benz injectors that are methanol safe. boost actuated not rpm. even without methanol injection I do believe that sumernats allow water injection which is quite ok to still do an impressive dyno run on pump fuel..

[Zac]

Cool, what is different about them that makes them methanol safe? I presume they might even be water safe.

[Datman]

That is simply awesome

Awesome job dude...hope it goes well at the Summer nats....do you think it will be ready for any other shoot outs prior to the summer nats?

[bernie-rx7]

They're stailess steel injectors with a special neoprene seal. and yes they are water safe also.

[Zac]

Nice, do you recall which model car they were from? do you have any other specification like flow, impedance, etc. Was the neoprene seal fitted yourself?

[bernie-rx7]

That is simply awesome

Awesome job dude...hope it goes well at the Summer nats....do you think it will be ready for any other shoot outs prior to the summer nats?

Thanks for the kind words. I really don't know if i will. I kinda like the idea of plodding along quietly and rolling up fairly unknown.

[Rhys]

Pretty impressive Bernie well done. More importantly does it chirp second?

[bernie-rx7]

Nice, do you recall which model car they were from? do you have any other specification like flow, impedance, etc. Was the neoprene seal fitted yourself?

Actually I really don't know. A cluey friend of mine informed me of them and suggested that they would be perfect to run off a couple of mt2 computers. So we just made up a rail and put them in. and then went to the dyno to tune the feed.

I could try to find out for you though.

[bernie-rx7]

Pretty impressive Bernie well done. More importantly does it chirp second?

third, forth and fifth. I think the box might be the next thing to go though. Series 5 won't hold up long if I get some decent tyres

[Zac]

I could try to find out for you though.

I'd appreciate that if it isn't too much trouble.
I've never actually tested an injector with water or methanol but 'they' say that the injector will rust or sieze.

[bernie-rx7]

I'd appreciate that if it isn't too much trouble.
I've never actually tested an injector with water or methanol but 'they' say that the injector will rust or sieze.

thats because most are mild steel. they also have rubber seals which deteriorate with methanol. I'll ask my friend later on in the week when I see him next.

[Zac]

Thanks, I'd almost given up on load-based non-fuel injection given that a typical injector will rust.

[bernie-rx7]

Thanks, I'd almost given up on load-based non-fuel injection given that a typical injector will rust.

Are you looking to ditch the intercooler idea also??

[Zac]

No, just compliment it. My intercooler won't be enormous but I might end up running upwards of 20psi.
I would also like to test for myself whether a load based water or water/meth injection is still viable. I have thought out a system that will operate load based rather than just 'on/off'.
Sounds like what you have done with the microtech.

[bernie-rx7]

I run 1 x LTX12 for fuel and ignition and 2 x MT2's one for for meth one for water. 4 methanol injectors and 2 water. Seems to work pretty good.

Apparently the merc injectors are called a Bosch 403.

You can find specs on this site. As I found out the washers are nylon not neoprene as I previously mentioned. I knew what I meant though

http://wwwrsphysse.anu.edu.au/~amh11...l_injector.htm

[Zac]

Thanks, and nice webpage but they're the wrong ohms! I'll investigate high impedance Bosch injectors. Maybe Bosch models are stainless steel and jap ones are stainless. Must be that 'superior german engineering' again

[Zac]

I forgot to ask, how much did you have to pull back on fuel (if at all) when you started injected the water/meth?

[bernie-rx7]

The meth and water injectors simply start pulsing more with higher boost load complimenting the normal fuel mix, a little fuel needs to be pulled from the LTX12 mix but not a great deal cause i still might drive it without meth and I dont want it to lean out too much if pushed. When the meth and water tanks are empty lights come up on the dash telling me that I should shut off one or both of the MT2 computers. It runs well without any water or meth at all I just don't push it too hard. Mind you if you do its hard to get the power down anyway.

[Zac]

Interesting, thanks. I was expecting to run dual timing maps - one for water, one without, but perhaps the injection won't have as much of an effect as I expect.

[bernie-rx7]

Don't get me wrong it is hard to get right. The Dyno tuner was treading very carfully with my engine and it did take a long time to get it to the point where I was comfortable. It is running quite fat at the moment and I have given up a few ponies for some engine safety.

[Zac]

Yes, I see. Trying to find the right balance.
What kind of pump do you use to push the methanol?

[bernie-rx7]

A mallory 110FI

[Ben Wilson]

zac - According to this thread on Toymods, you can add a little coolant to a water/methanol mix and that will stop normal fuel pumps and injectors from corroding...

[Zac]

Thanks Ben. I wonder if one of those Flojet pumps could handle a 90%water 10% methanol mixture. They look pretty hardy.

[Grunt]

lovely...

completly understated interior and thats even better!!

Congrats...

[Grunt]

lovely...

completly understated exterior and thats even better!!

Congrats...