Upgrading injectors where to find? 4.2sc Jaguar XKR

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Mar 11, 2021 | 10:47 PM

AlexJag

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Upgrading injectors where to find? 4.2sc Jaguar XKR

Planning an e85 full conversion. Any info on which injectors can be used will be greatly appreciated!
07-09 XKR

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2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 112.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 SC (Alpha Jag ECU, TCU tune, crank pulley), 600+ HP, 11.6 sec 1/4th mi 122mph, 7.6sec 1/8th mi
2018 Jaguar F-Type (AlphaJag ECU TCU, lower upper pulleys intake) 10.77 ,131mph ,700hp

Mar 12, 2021 | 05:13 AM

guy

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why?
https://www.caranddriver.com/researc...at-is-e85-gas/

Mar 12, 2021 | 07:25 AM

gkubrak

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Dont let CA emissions and Nancy Pelosi take you down this path!!

Mar 12, 2021 | 01:30 PM

AlexJag

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Quote:

Originally Posted by guy

why?
https://www.caranddriver.com/researc...at-is-e85-gas/

your realy asking why? It's only the most common power adder on forced induction cars these days
https://www.google.com/search?q=why+...obile&ie=UTF-8

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Last edited by AlexJag; Mar 12, 2021 at 01:34 PM.

Mar 12, 2021 | 01:39 PM

Cee Jay

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Quote:

Originally Posted by AlexJag

your realy asking why? It's only the most common power adder on forced induction cars these days
https://www.google.com/search?q=why+...obile&ie=UTF-8

A lot of Mustang guys get E85 tunes and gain a LOT of power.

Mar 12, 2021 | 04:46 PM

V7Sport

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From: South County Rhode Island

Very interesting! Was aware of Indy cars and speedway bikes on alcohol. Very high engine performance.
But E85 was hard on alcohol intolerant road car components except Flex fuel cars so personally never considered it. And I don't think it is available locally anyway. Please keep us posted on your higher performance pursuit.

Mar 12, 2021 | 07:15 PM

AlexJag

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Quote:

Originally Posted by V7Sport

Thanks, I love the persuit of power ! If you follow my threads ,I have one of the highest dyno 4.2 sc xkr cars around as well as fastest 0-60 and 1/8 mi times, also just finished tuning the fastest 5.0 XFR on the world recently , so far at 11.4 but likely it will be even lower than that soon

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Mar 13, 2021 | 05:51 AM

XJR-99

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You can go quite far with stock injectors, but next step could be Bosch EV14 49mm 630cc @3bar., 0280158298

Last edited by XJR-99; Mar 13, 2021 at 10:54 AM.

Mar 13, 2021 | 10:09 AM

AlexJag

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Quote:

Originally Posted by XJR-99

You can go quite far with stock injectors, but nexy step could be Bosch EV14 49mm 630cc @3bar., 0280158298

Thank you! How about the capability of the stock fuel pump?

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Mar 13, 2021 | 11:13 AM

#10

XJR-99

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Quote:

Originally Posted by AlexJag

Thank you! How about the capability of the stock fuel pump?

I am not very familiar with 4.2 single pomp ( returnless fuelling system), but what I know from 4.2 TS installs, the pump has some limitations and you can not control the duel pressure. I have rails from 4.2 but the have modded with return line and 2 x 255 Walbro. KB Boost-A-Pump can be used to increase pump capacity at WOT. My injectors are quite big ones... But big airpump needs a lot of fuel 😎 E85.

Mar 13, 2021 | 12:10 PM

#11

AlexJag

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Quote:

Originally Posted by XJR-99

I tried testing the capability of the stock injectors and I think they are running out of room at 34% ethanol mixture. I can control the fuel pressure in the ECU but it appears they adjusts on demand per AFR requirements anyway or I'm misunderstanding on how it works. I have seen it as high as 75 psi at wide open throttle and at around 44 PSI at idle.

Mar 13, 2021 | 02:50 PM

#12

XJR-99

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Quote:

Originally Posted by AlexJag

Idle = base pressure - vacuum
Wot = base pressure + boost

Mar 13, 2021 | 03:20 PM

#13

steve_k_xk

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Quote:

Originally Posted by AlexJag

I've looked on dragtimes and I haven't seen your runs listed for the xfr ???
Did you not run these times at a actually drag strip

Mar 13, 2021 | 03:27 PM

#14

AlexJag

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Quote:

Originally Posted by steve_k_xk

I've looked on dragtimes and I haven't seen your runs listed for the xfr ???
Did you not run these times at a actually drag strip

Expecting better results at the drag strip. Dragy was used on the back streets . If you're not familiar dragy is dead on accurate uses 10 GHz gps device for measurements simalar to Race Logic.

Last edited by AlexJag; Mar 13, 2021 at 03:39 PM.

Mar 13, 2021 | 03:35 PM

#15

AlexJag

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Quote:

Originally Posted by XJR-99

Idle = base pressure - vacuum
Wot = base pressure + boost

I guess I have to look into that more , but I can't be making 31psi of boost so I wonder how that works

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Mar 13, 2021 | 06:47 PM

#16

steve_k_xk

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Quote:

Originally Posted by AlexJag

Expecting better results at the drag strip. Dragy was used on the back streets . If you're not familiar dragy is dead on accurate uses 10 GHz gps device for measurements simalar to Race Logic.

so these times are technically unofficial ..a back road in the middle of no where does not make this officially the fastest xfr that can't be claimed- please get it to a drag strip (don't take this the wrong way)

Last edited by steve_k_xk; Mar 13, 2021 at 07:40 PM.

Mar 13, 2021 | 08:47 PM

#17

AlexJag

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Quote:

Originally Posted by steve_k_xk

Steve I got nothing to prove to you

I can tell you this though , I go drag racing regularly And most of my buddies have Draggy devices as well and Track time slips are always nearly identical to Dragy time slips down to hundreds of a second. By the way most magazines use these sort of GPS devices for testing and not the actual track slips.

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Mar 13, 2021 | 11:39 PM

#18

XJR-99

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Quote:

Originally Posted by AlexJag

I guess I have to look into that more , but I can't be making 31psi of boost so I wonder how that works

Base pressure for 4.2 is 55PSI, so you have 11PSI vacuum and 20PSI boost if those readings are right.

Mar 14, 2021 | 01:18 AM

#19

MoscowLeaper

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Quote:

Originally Posted by steve_k_xk

Anyway, there was a 50shot of cheating, so thats not a "fastest" car, it's a cheating car

Mar 14, 2021 | 03:32 AM

#20

AlexJag

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From: San Diego CA

Quote:

Originally Posted by XJR-99

Base pressure for 4.2 is 55PSI, so you have 11PSI vacuum and 20PSI boost if those readings are right.

There is no way I have 20psi of boost more like 11- 12, so I wonder how that works out

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