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Posted by: orangecrate Nov 7 2014, 10:47 AM

Randon question for the future. How big can you go before the D-jet literally does not supply enough fuel ? And is an injector upgrade possible? Just curious.

Posted by: SirAndy Nov 7 2014, 10:57 AM

I know of a 2056 with a mild cam running a stock D-Jet setup making about 125hp.


For anything bigger or a more aggressive cam profile, the stock D-Jet is not the right choice.

Posted by: orangecrate Nov 8 2014, 09:30 PM

Spanks the stock what? 80 hp Thanks. I could probably live with that for awhile!

Posted by: r_towle Nov 8 2014, 10:29 PM

2.4 liter

Posted by: saigon71 Nov 9 2014, 11:15 AM

QUOTE(r_towle @ Nov 9 2014, 12:29 AM)

Posted by: orangecrate Nov 9 2014, 08:58 PM

Yes please enlighten us. That,s a big jump!

Posted by: rhodyguy Nov 10 2014, 08:28 AM

More likely than not, dual fi throttle bodies, fuel management, GOOD linkage, dif spark source, an exhaust, not stock heat exchangers, to meet the flow needs...parameters really change when jumping to 2270 and up. Bring money and a big pile of it.

Posted by: Bleyseng Nov 10 2014, 09:27 AM

QUOTE(saigon71 @ Nov 9 2014, 09:15 AM)

QUOTE(r_towle @ Nov 9 2014, 12:29 AM)

2.4 liter

What mods (if any) are required to the D-Jet system to support a 2.4 liter? Bigger fuel injectors and MPS tuning?

Thanks.

Posted by: orangecrate Nov 10 2014, 09:44 AM

I'm well aware of the old hot rodder saying "Horsepower cost money,how fast ya wanna go??" Goes along with " No replacement for displacement." I'm a poor boy. Just curious how many cc's I can stuff under a stock well sorted out D-jet. I'm just looking at a DD and long distance touring car. When I want an adrenalin rush I just twist my wrist!! The bike takes care of that.

Posted by: 914bub Nov 10 2014, 10:36 AM

QUOTE(orangecrate @ Nov 10 2014, 07:44 AM)

I'm well aware of the old hot rodder saying "Horsepower cost money,how fast ya wanna go??" Goes along with " No replacement for displacement."

Posted by: aircooledtechguy Nov 10 2014, 11:03 AM

I can speak as to the ability of the stock injectors to handle larger, more powerful engines. The Megasquirt2 I previously powered the 2056cc in my Squareback was running the smaller yellow-top D-jet injectors (26#p/hr) out of a VW Squareback (1600cc) with absolutely no problems going lean due to lack of fuel flow. Tons of power available. The stock green-top injectors on a 914 2.0L flow just over 37#p/hr. That's a lot more capability than most folks realize.

The cam and its effect on the MPS will be what stops you with D-jet. If a programmable MPS was available, D-jet could be run on virtually anything up to the point at which the TB/plenum/runners became the restriction. Seems as though Jake mentioned that the 2.0L plenum became an issue above 2270 or so on his dyno but I could be wrong on that. . . He would have the empirical data on that better than anyone.