So first trying to figure out exact injector size on our 07-09 Xkr cars to see how much room we have on maximum Ethenol content. Going by the super rich factory AFR at WOT it appears that there will be some room for more Ethenol with leaned out WOT.
Flex kit installed by anyone?
Specs on our injectors ?

 

Isn't the max recommended ethanol content rated at 15% due to fuel line, injectors, seals, and tank corrosion tendencies? I'll admit that a higher alcohol content with a much richer mixture will result in improved performance, the lines and seals may degrade much sooner and cause all sorts of problems unless preventive measures were included.

 

The R does have an uprated higher pressure fuel pump as well as uprated larger injectors. I have often thought about giving this a try however I do fear what could possibly degrade as you say from exposure to higher alcohol levels.

 

If they are original injectors I would get them serviced, cleaned and calibrated as from previous experience with other marques at 5yrs they'll be running 10-15% off optimal. When they are off you can check the capacity of em

Why not go for methanol/water injection, no perceptible damage to components and a cleaner engine to boot?

 

I have a Snow meth kit. While it does allow room to tune a bit more power it is more about managing IATs and heatsoak, helping maintain consistent power rather than creating more.

I am at the point where more power is going to start costing big $$$$ so considering a less costly option, nitrous somewhere between 50 shot and 100 shot.

 

The right methanol kit along with the tuning to use it correctly can easily add 100+ hp to a V8, especially a forced induction one.
As a glorious side effect, the Water/Meth cleans the backside of the intake valves, so BONUS

 

Why didn't you say this on your post 2, also it just kinda repeats what poster 4 said...I guess just like the sound of your own posts?

 

But you could also try H2O/CH3OH introduced into the intake runner.

 

There are type of 4.2 injectors. 03-05 green ones and 06-09 red ones. I have not flowed them but there is indication that at 43.5PSI ( 3bar ) they flow just 330cc, but since base pressure has been set
for 55PSI the actual flow is 370cc. At the 65PSI those injectors flow a bit over 400cc. I have tested 4.0 R injectors, AJ 26S and AJ27S, and they flow 360cc at 43.5PSI - but since base pressure is just 45PSI, they flow less than 4.2 ones. 4.2 injectors can be replaced by Bosch EV14 - forexample 530cc or 630cc. Since you are able to tune the fuel maps the size is not a problem even with normal fuel. There are a couple of problems with 4.2 fuelling system ( if not also the fuel pump ): The system is retunless, so you might want to modify it to be with retunline and add FPR to set desirable fuel pressure. Also, for E85, the fuel damper gaskets may start to leak because of the rubber they have used as OEM. If you would have return line - you do not 100% need the dampers. I have used this route. There are very good E85 flexfuel kits available nowdays. I used one 2016-2018 and fuelling was just fine at any ethnaol & - driven 5-85%. Now I have fuelfuel function in the aftermakert ECU, so no need for separate box.

EDIT: "Stock flow on these injectors matches the OE specifications.

330CC/MIN 100% Duty Cycle @ 43.5 PSI
https://www.ebay.co.uk/itm/SET-of-8-...-/201820425788

 

As much as I would have like to have an easy 100HP increase, we did not see this on my car. Cooler IATs and consistent engine temps however are there as well as the bonus of cleaning everything. I did speak with several tuners and the consensus was that water/meth itself does not really offer much of a direct power increase, in addition to temp reduction, it's more about being able to advance timing a bit more than without it and being able to increase boost both of which will increase power on their own.

 

XJR-99 That was some post, I'll not quote you (as seems to be favoured by many when they're posting directly after).

If I wore one I'd doff my cap to you sir...also dispels the myth propagated by some that 100bhp is achievable. I saw a 8% dyno increase in my SC'd MX-5 which would be circa 35bhp on 500bhp engine...and courtesy of an ECU controller was able to see a 23 degree reduction in intake temps.

Thank.you again for your post

 

Yeah, I said water/meth AND a tune. That would also aid in advanced timing, denser and cooler intake charge, and higher octane fuel. Easy to get 100 hp from all that with a V8 5 liter forced injection engine. Hecks, a very MILD tune (XKR-S?) gets the bonus 50HP right off the bat.

 

Thanks for the tips, I was hoping that our stock red ones flow at least 420 or so CC. I guess I can always log and calculate the duty cycle of the injectors to see how much e85 I can push.

 

Cee Jay I wish this was true I would be all over a Methanol kit on my Xkr . Unfortunately results are inconclusive and appear minimal even with tuning with a Methanol kit. I had one on my 335i make around 480hp crank , Methanol def helped with temperature but didn't see much difference with power though.

 

A cooler intake charge could theoretically gain over 20hp on our engines. Yes, your 4.2 is different than my 5.0, but still the numbers should be somewhat similar. These things DO run hot, indicated by your own cooler thermostat and better pump.
The XKR-S tune on a 5.0 gains an easy 50hp, so therefore the cooler intake charge combined with that very safe and proven mild -S tune can net a good 70hp alone. A BETTER tune, like you have with your cooler temps, better timing curve and different fuel trims could easily get another 20hp.
End result with a good tune and water/meth, at least 90hp.
Are my musings really that far off?

 

I think you're missing the point that I already have a good tune and cooling and near maximum gains possible. Methanol will help with temperatures to keep timing in check from being pulled but as far as gains from adding methanol ,not so much.. and just to point out I think cooling setup in a 4.2sc in factory form is pretty good as it is, and even with added pulley it does it's job. With my setup additional fan programing, lower temp thermostat, Bosch 010 helps to keep cooling even better in check...
For more consistency and octane benefits I would prefer e85 conversion instead, it's just kind of unexplored territory with the Jaguar community .

 

I heard rumors of a flexfuel kit on an S-Type Jaguar and it was fine, it ran e65 though ..

 

Alex, no I wasn't missing that point. I was talking from stock. Hellz, it's not like meth would add anything to a blown 682 hemi at 15:1 compression running 90% nitro.
Still though, I'd add meth injection just cuz Cleans Valves.

 

I think I just found what I'm looking for in the ECU file itself. 90% confidence... Good news if correct 👍

 

Well there ya go. But, 50 lb/hr seems a bit on the low side for alcohol. Will that be enough? I truly have no idea, myself. Course, E85 doesn't need as much as 100% alcohol.