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+--- Thread: Squeezing more power out of an already maxed out 11mm bosch pump (/showthread.php?tid=35814)
Squeezing more power out of an already maxed out 11mm bosch pump - Paul_13 - 09-04-2017
Need to try and squeeze more fuel out of my 11mm which has pretty much been maxxed out. It's boosting around 35psi and it's clear on boost. I've got a nice free flowing system and intercooler.
Bits I've already done :
I've turned it back a spline on the arm
Modified the arm to allow it to travel round further.
Idle screw is fully backed off and fuel screw to suit
Pretty harsh lda grind, plastic limiter washer removed
Just wondering if there's any other internal pump mods I can carry out. Going to strip the pump and rebuild it at some point
Squeezing more power out of an already maxxed out 11mm bosch pump - bashbarnard - 09-04-2017
Bang it back another spline. Have you actually cut the bit on the pump where the throttle limiter screws in. As youll notice itll knock against that otherwise. Cut that bit and youll get more. Can also change the delivery vanes as well. From memory i think terrano ones will also give a bit more as well. Few bits for you to think about there
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RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Paul_13 - 09-04-2017
Terrano 2 delivery valves. Was going to try and get a set.
I'll knock it back another spline, see how that goes
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Paul_13 - 09-04-2017
![[Image: 20170409_201802_zps63igzbhy.jpg]](http://s1224.photobucket.com/user/paul13205/media/20170409_201802_zps63igzbhy.jpg.html)
![[Image: 20170409_201815_zpsuarcnldp.jpg]](http://s1224.photobucket.com/user/paul13205/media/20170409_201815_zpsuarcnldp.jpg.html)
Squeezing more power out of an already maxxed out 11mm bosch pump - bashbarnard - 09-04-2017
![[Image: 61eb3959cdcbfb2f0847eceefa353747.jpg]](https://uploads.tapatalk-cdn.com/20170409/61eb3959cdcbfb2f0847eceefa353747.jpg)
Cut it off youll get more travel may have to do something about the manual cut off as well although ive never had an issue with that bit
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Piggy - 09-04-2017
Check throttle pedal position vs arm position... I would put money on not having enough travel in the pedal to go full throttle...
especially due to the position of the cable on the throttle arm
...not mentioned gov'nr mod unless I missed it... you shimmed that puppy hard?
Also, about the splines, I managed knocking back 3 splines on my 11mm in the end.
You say the 11mm is maxxed out... as in, more max fuel and the revs hang?
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - zx_volcane - 09-04-2017
transit gov cradle has shorter throw on it iirc - don't have to much about grinding the pump, get more lever movement for same pedal movement.
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Piggy - 09-04-2017
Yeah good shout
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Dave - 10-04-2017
Delivery valves are a must, I used to use the Transit delivery valves gives heaps more fuel, you can actually grind the stock ones down too, just have a few spare incase you f*ck it.
Transit cradle, harsh Govmod, 11mm head, advajnce piston grind, you can modify the LDA swining arm inside to allow a further throw when the LDA drops, this will give you more on/off boost fuel. Grind out the inlet ports, add an extra 2 slices into the valve pump,
Have good free flowing fuel lines, and filter (probably best sack stock filter off).
There are heaps more mods you can do get at it with the grinder.
You must have a fairly heroic setup be be maxxed out with an 11mm pump, good one! Get an internal pump gauge on there so you can see what its doing - if your pump is clean it would be good to know what IPP is, and if it drops after a hard pull. Mine used to pull hard, then empty itself IPP die and have to play catch up with the fuel lines.
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - darrenjlobb - 10-04-2017
What LDA pin is in it? A totally stock pump with 11mm head and LDA pin is normally enough fuel to blow Coal from Cornwall to scotland....
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Paul_13 - 10-04-2017
![[Image: IMG-20131026-WA0001_zps3bf91c6d.jpg]](http://s1224.photobucket.com/user/paul13205/media/IMG-20131026-WA0001_zps3bf91c6d.jpg.html)
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - welshpug - 10-04-2017
moving the cable clamp fitting closer to the pivot will change the ratio.
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Paul_13 - 10-04-2017
Could you elaborate on the advance piston grind please
(10-04-2017, 07:26 AM)welshpug Wrote: moving the cable clamp fitting closer to the pivot will change the ratio.
Cheers, did that last night. It catches on the stop lever. It's at a funny angle cos of the boost pipe
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - zx_volcane - 10-04-2017
(10-04-2017, 07:27 AM)Paul_13 Wrote: Could you elaborate on the advance piston grind please
(10-04-2017, 07:26 AM)welshpug Wrote: moving the cable clamp fitting closer to the pivot will change the ratio.
Cheers, did that last night. It catches on the stop lever. It's at a funny angle cos of the boost pipe
You can remove material from one end of the advance piston to enable it to move further and gain more advance - although tbh without a test bench you don't know if you're getting full advance as it is.
There are advance piston cover spacers available off the shelf which achieve same.
Roller wear on the case can be an issue too if you push past stock and there are grooves in the pump you can wind up with the cage getting stuck.
You're in the dark though with these mods as to what you're gaining, what they're doing - without a test bench.
Same with any lever / lda mods - bit too heavy with the grinder or in the wrong place and you will loose control of idle, or smoke control ..etc ..etc
Not convinced on DV valves, don't think they're much of an issue on IDI motors.
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Chris_90 - 10-04-2017
(10-04-2017, 12:28 AM)Dave Wrote: Delivery valves are a must, I used to use the Transit delivery valves gives heaps more fuel, you can actually grind the stock ones down too, just have a few spare incase you f*ck it.
How do you go about grinding the standard delivery valves just out of intrest?
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - zx_volcane - 10-04-2017
(10-04-2017, 07:47 PM)Chris_90 Wrote:(10-04-2017, 12:28 AM)Dave Wrote: Delivery valves are a must, I used to use the Transit delivery valves gives heaps more fuel, you can actually grind the stock ones down too, just have a few spare incase you f*ck it.
How do you go about grinding the standard delivery valves just out of intrest?
I'll bet a fiver it was with a 9 inch grinder knowing Dave
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Dave - 10-04-2017
(10-04-2017, 07:54 PM)zx_volcane Wrote:(10-04-2017, 07:47 PM)Chris_90 Wrote:(10-04-2017, 12:28 AM)Dave Wrote: Delivery valves are a must, I used to use the Transit delivery valves gives heaps more fuel, you can actually grind the stock ones down too, just have a few spare incase you f*ck it.
How do you go about grinding the standard delivery valves just out of intrest?
I'll bet a fiver it was with a 9 inch grinder knowing Dave
Hehe Tom you do have more of a systematic approach to pump mods. The DVs on my first pump did make a huge difference to fuel delivery. As long as you don't kill the seat there is only gains to be had if you see how restrictive the origice is on original ones round stock DVs
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Paul_13 - 13-04-2017
Going to knock the arm back a spline and I'm off to a scrap yard on Saturday to find some Terrano delivery valves
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Paul_13 - 14-04-2017
Will unscrewing this as shown allow me to increase fuel?
![[Image: IMG-20170414-WA0000_zpsddpn6qka.jpeg]](http://s1224.photobucket.com/user/paul13205/media/IMG-20170414-WA0000_zpsddpn6qka.jpeg.html)
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Mattcheese31 - 14-04-2017
well i'm just thinking coz that pic is back to front but yes, if the idle came down which i think it will, you can squeeze a bit more out yes
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Paul_13 - 14-04-2017
It's not back to front?!
That's the front of the pump. The stop lever is shown
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Mattcheese31 - 14-04-2017
(14-04-2017, 03:31 PM)Paul_13 Wrote: It's not back to front?!
That's the front of the pump. The stop lever is shown
ahh shit, there's me thinking it was the idle, thought it looked weird, in that case no, i don't think so mate, can't see why that would make a difference, wouldn't that raise it if anything?
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Paul_13 - 14-04-2017
Need to turn the boost down its doing 45psi in 4th :/
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Mattcheese31 - 14-04-2017
(14-04-2017, 05:44 PM)Paul_13 Wrote: Need to turn the boost down its doing 45psi in 4th :/
nice, you got uprated head studs n shit?
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Paul_13 - 14-04-2017
Yeah arp's
RE: Squeezing more power out of an already maxxed out 11mm bosch pump - Mattcheese31 - 15-04-2017
(14-04-2017, 07:08 PM)Paul_13 Wrote: Yeah arp's
was gonna say, my tdo4 lifted the head at about 26psi lol
RE: Squeezing more power out of an already maxed out 11mm bosch pump - Paul_13 - 15-04-2017
Just picked up the 9mm spare bosch pump I had and give it a go at rebuilding it
RE: Squeezing more power out of an already maxed out 11mm bosch pump - Dum-Dum - 07-05-2017
Having a look at your pics i have a few suggestions.
You still have both hot and cold idle screws, certainly the hot one can go and will allow you to add more fuel and bring the idle down.
You also still have the minimum throttle stop screw and its out a turn or 2, again, remove this entirely and again it'll drop the idle and let you bring the fuel up. Likewise you can remove the bit that hits the minimum throttle stop from the arm with a grinder so you have even further minimum travel.
I might be mistaken but your lines look like they are only 8mm, upgrade to 10mm with a proper sized filter. The outlet from the tank is 10mm on the 306.
RE: Squeezing more power out of an already maxed out 11mm bosch pump - Paul_13 - 07-05-2017
I'll have a look at that.
10mm lines and a fuel filter off a train engine