Okay.. I am starting on my 20B project any week now and have been rounding up bits for some time.. I am hoping to make around 650bhp flywheel power on a single turbo conversion. What I want to know is what injectors I will need to get there. Will putting 1000cc secondary injectors give me enough juice with the support fuel modifications? Hoping I can leave the Sock primaries in to keep the low now running nice and clean? I assume they run 550cc same as the 13B?

 

I make 525 WHP at 12 PSI and 650 at 18 PSI on a T78 Dual BB turbo. I have 850ccs in the primaries and 1600ccs in the secondaries. I use a Microtech and the idle is very nice and streetable.

I also use two Denso Supra pumps with one coming on with the car and the other, activating under boost.

I'd recommend something like this for your setup as I think you'll run out of fuel with a smaller setup. Hope this helps.

 

Thanks for the reply there David,
I did wonder if I could get the 1000cc and put in 850's for the primaries to get enough fuel? If the power output is roughly scaled compared to a 13B then that should be plenty of fuel.. Pump wise I was thinking twin Bosch or something similar.
I would like to run 1bar boost to minimise stress on the motor so at least from your numbers I reckon I am in the right ball park? Those are some good numbers!
I have a microtech ECU also..

 

^ I am sure someone on here knows how to work out the numbers. Not sure what advantage there is to using the smaller secondary injectors except right at the stage in point I guess they would be easier to control.

My advice is to always over engineer because you are always going to want more I'd go with larger secondaries. However, you should have no problems making your goal HP just watch the duty cycle on the secondaries.

Finally, I highly recommend a water injection kit to keep things nice and cool. I have the AEM kit and it works just fine. I also own a 20B Aquamist kit which is more sophisticated, so much so my tuner wanted something easy so I went AEM. The Aquamist pump makes a great paperweight!

 

Water injection.. Hmm.. Does it really make a lot of difference? even if you have a vented bonnet and nice ducted air feed to the induction?
Injecting water into your engine always sounded a bit odd to me! But I guess it is only a tiny amount?

Cheers
Lee

 

Go 850/1600 or larger.

Water injection has been used on aircraft since WWII, to reduce detonation and increase fuel octane rating. I have the AEM WI setup on my 20B also.