My Kenne Bell Boost a pump unit arrived and before I tear into the wiring I want / need to know if I have the correct unit. The one sent to me is for a single driver for both pumps.

The boost-a-pump, when activated at full throttle, delivers 17.5 volts to the pumps to substantially increase their output.

Thank you again in advance

 

If I understand your question, there are two different circuits for the two pumps. The second kicks at 3000 rpm, as I recall. And what pray tell, do you need such a boost for? The pumps are such a PITA to change, I sure wouldn't do anything to stress them unless I needed to.

 

I need to confirm which Boost a pump product I need for my application...

I need the extra pressure because my stock injectors will be maxed out to match all the extra air that will be moving through my engine with the many modified parts I'm adding

92mm mass air
3.5" or 4" intake tube
Maxbored TB
Ported and polished Elbow, intake manifolds, heads with larger valves, exhaust mods, HUGE ram air, maybe +3lb pulley later, fuel pressure regulator set higher like 55 psi vs 43. etc

The stock injectors may not be up to task otherwise. The Boost a pump products are proven to be reliable and not stress and kill the stock pumps.

 

Take a look at the pump to relay, and pump to ground wiring. Increasing the wire gauge is going to get you more than boosting the voltage. Take a look at any tuner site.

Then decide whether you really need a boost-a-pump or better pumps.

And how can you deliver 17.5 volts out of a 14.0 volt system?

 

It looks like a DC-DC converter of some sort. Basically it converts the input voltage to high frequency AC internally, steps it up, then rectifies it back to DC and regulates the output at a higher voltage.

 

Well of course it is. It's just a very bad way to do things though.

 

DC-DC converters are the most common way of stepping up a DC voltage. With modern switching MOSFET's they're actually highly efficient. I've dabbled with them & built my own-they typically give conversion efficiencies of 90% or over.

The biggest concern with the main engine power mods to the XJR is the extra driveline stress-the differential in particular is a weak point on the XJR's. The diff on the X308's is not like the over-engineered units on earlier Jags, it's a different type & not as strong-it doesn't have a big overload margin for modified XJR's.

Jaguar were under pressure to rush the X308 into production, so they specified the same diff for the XJR models as on the regular XJ8 models-look in the vehicle's own handbook specifications to confirm this. The only difference between the models is the ratio on the smaller-engined 3.2L version.

If you're going to seriously increase the engine power, then repeated full-throttle standing starts in 1st gear will severely stress the standard diff & also stress the gearbox.

 

Let's see what happens to my diff next summer when go to the strip with 15PSI soft wall drag radials. Hopefully Quaife LSD helps a bit. Gearbox/torque converter should be almost bulletproof.

 

Waiting to see the results

 

Got a flak suit?

 

Have you read this carefully? http://kennebell.net/KBWebsite/Commo...elpumptech.pdf

 

I did get the KB89069 which I think is the correct one..in the PDF you posted it shows as the '03 cobra with stock dual pumps.


So what is single driver vs dual driver??