 D-Jet, How big an engine can it support? |
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| orangecrate |
 Nov 7 2014, 10:47 AM
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#1
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Member  Group: Members Posts: 152 Joined: 16-September 13 From: Apache Junction AZ Member No.: 16,394 Region Association: Southwest Region  |
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.
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Replies(1 - 10)
| SirAndy |
Nov 7 2014, 10:57 AM
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#2
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Resident German Group: Admin Posts: 41,688 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
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. (IMG:style_emoticons/default/smile.gif) |
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| orangecrate |
Nov 8 2014, 09:30 PM
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#3
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Member Group: Members Posts: 152 Joined: 16-September 13 From: Apache Junction AZ Member No.: 16,394 Region Association: Southwest Region |
(IMG:style_emoticons/default/biggrin.gif) Spanks the stock what? 80 hp Thanks. I could probably live with that for awhile! (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif)
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| r_towle |
Nov 8 2014, 10:29 PM
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#4
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Custom Member Group: Members Posts: 24,591 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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2.4 liter
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| saigon71 |
Nov 9 2014, 11:15 AM
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#5
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Advanced Member Group: Members Posts: 2,000 Joined: 1-June 09 From: Dillsburg, PA Member No.: 10,428 Region Association: MidAtlantic Region 
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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. |
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| orangecrate |
Nov 9 2014, 08:58 PM
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#6
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Member Group: Members Posts: 152 Joined: 16-September 13 From: Apache Junction AZ Member No.: 16,394 Region Association: Southwest Region |
(IMG:style_emoticons/default/blink.gif) Yes please enlighten us. That,s a big jump!
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| rhodyguy |
Nov 10 2014, 08:28 AM
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#7
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,098 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
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.
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| Bleyseng |
Nov 10 2014, 09:27 AM
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#8
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
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. Yes, to both. |
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| orangecrate |
Nov 10 2014, 09:44 AM
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#9
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Member Group: Members Posts: 152 Joined: 16-September 13 From: Apache Junction AZ Member No.: 16,394 Region Association: Southwest Region |
(IMG:style_emoticons/default/biggrin.gif) 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.
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| 914bub |
Nov 10 2014, 10:36 AM
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#10
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Member Group: Members Posts: 433 Joined: 16-August 13 From: Modesto CA. Member No.: 16,260 Region Association: None |
QUOTE(orangecrate @ Nov 10 2014, 07:44 AM) (IMG:style_emoticons/default/biggrin.gif) 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." The way I heard it was,"Speed cost money, how fast do wanna spend?"... Same idea though. (IMG:style_emoticons/default/biggrin.gif) |
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| aircooledtechguy |
Nov 10 2014, 11:03 AM
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#11
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The Aircooledtech Guy Group: Members Posts: 1,966 Joined: 8-November 08 From: Anacortes, WA Member No.: 9,730 Region Association: Pacific Northwest |
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. |
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