re[6]: Injector sizes

Mathew · Post by **Mathew** » Tue May 06, 2003 2:41 pm

Lou, Contacts on the SebringMiata email list have told me that as the LINK works with the standard fuel pressure I'd need new ones that flow a whole lot more. They recommend a minimum of 370cc for mildly boosted engines.

Jeff, All those Japanese add-on electronics are a bit too pricey for me (even second-hand) and by the time I get enough of them to cover all the different functions, its almost as much as a LINK.

John, have you checked with Ross at mx5mart to see if he's got any secondhand number plate holders?

M@

Grant Schou · Post by **Grant Schou** » Tue May 06, 2003 4:09 pm

M@ for the money you would spend on all these bits, presumably for a bit more squirt, why not buy the JR boost upgrade for $449 US - guess you would then need an intercooler though huh ?

Grant

lou Girardin · Post by **lou Girardin** » Wed May 07, 2003 8:43 am

How do 2 extra injectors reduce charge temps and larger injectors don't?
The only way to reduce charge temps in this manner is to run a sufficiently
rich A/F ratio with either set-up, not good for max power or engine life. (
Unburnt fuel washes the cyl walls).
Granted, the MX engines are very knock resistant anyway, but there are better
ways to reduce charge temps, eg; intercoolers and my particular favourite,
water injection.
WI will allow 12 degrees base timing even at 8 - 10psi boost without other
knock control measures.
Lou

From k.jones@auckland.ac.nz Fri Apr 27 16:44:13 2007
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The extra injectors firing into the manifold gives time for the latent
heat of evaporation of the petrol to cool the incoming air. The standard
injector placement just upstream of the inlet valves gives very limited
time for cooling to have any effect.
I will be doing some testing in the next month or so measuring charge
temperatures upstream of the injectors, ie, after the intercooler, and
in the plenum downstream of the extra injectors so should be able to
quantify the effect on the MX engine then.

Keith

lou Girardin · Post by **lou Girardin** » Wed May 07, 2003 2:38 pm

MessageAnother factor to bear in mind is that the standard fuel rail allows
No. 4 cyl to run lean at high boost, not a problem at 7psi though. Most US
tuners use a dual feed rail and have reported problems with fuel distribution
using single or dual add on injectors, apparently Brant at BR performance may