You can see that those terribly clogged intercoolers are not anymore intercoolers (very restrictive 4.2 core on the right) . They are just empty boxes. I would say they are big plenums and moves all the airflow that massive TS has created

 

Very interesting, am curious to the pressure difference without the cores, and new noise levels ;-)

 

A non-intercooled XJR

 

What happened to the 5 liter intercooler setup you had shown pix of earlier?

 

X300 XJRs (1995-1997) are the most reliable of the bunch, but it’ll be tough finding one with low mileage at this point. Mine has almost 200k on it. Most of the time, unless it was owned by an enthusiast, there will be a lot of Kodi nox deferred maintenance.

 

E85 + water/meth. Half throttle launch. One day this goes FAST

 

Itäs off-season now. .. E85 cold start. 3" catless pipes with ported SS manifolds and X-pipe. Walbos keep some noise and well as KB under the hood

 

Sounds great!

 

I know you're running a vacuum pump for crankcase ventilation, right? If not, you should be. Guaranteed power bump. I'd guess between a 8 - 10hp bump in your case.
If you are, is it mechanical or electrical?
Actually, if you want to, you could install a mechanical one that pulls over 20inHg of vacuum and run it just long enough to make a run and you could maybe do another 5hp on top of the 8-10. Install a regulator to keep it at no more than 16inHg the rest of the time tho.
I'm sure you're already on this tho. You can't be serious about making power and not be running a vacuum pump right?
I'm curious how much you shaved off your 1/4mile time pulling how much vacuum?

 

This one with BIG hoses:

 

Yeah, thats a nice catch can. Looks to be of similar quality to my Add1 can. Except my ADD1 can has 2 clean side(vacuum) ports.
But it's not a vacuum pump. Neither is your can. You need to run a vacuum pump to evacuate that blow by better than just passively for one but also to maintain a vacuum in the crankcase to promote better ring seal, thus reducing blowby and increasing hp.
If you're running it to atmosphere, you're not running any vacuum even from the intake. Which is fine. It doesn't produce much vacuum under load anyway and this is where you really need it. But youre running in a constant positive pressure enviroment. You need a pump on the clean side before the filter. It's the vacuum that frees up power by allowing the pistons move freely and not fight against positive pressure and promote better ring seal. In fact you COULD run low tension rings given you maintain an acceptable vacuum.
It can be a mechanical vacuum pump that runs off a belt or an eletrical pump like the one I run that's in my ultimate crankcase breather thread.
if you're not running your crankcase at a minimum of 8 to 10inHg of vacuum, you missing out on some easy, relatively cheap power. Especially with that boosted engine. I would bet a good 10hp. Definitely a sizeable bump across the entire RPM range. A nice bump that WILL bring a quicker 1/4 mile time.
You would gain even more running 20inHg of vacuum but would require coated wrist pins for starters.
Your best bet is just run between 10 to 16inHg of vacuum.
I can't make it any clearer. You're missing out on some easy power.

Here, check this out...

Here's a link to my Ultimate crankcase breather mod.

 

just using a chiller and meth instead?

 

Just E85 and proggressive water/meth spray before and after the supercharger. Now all the boost we see goes into the engine.
Before there was up to 7psi difference before and after IC cores. The best solution for daily drivings would be BIG IC cores system.
Cusotm made of course.

 

You get even more blowby with that setup I bet. How long have you been running it?

 

Wow, that's a lot of difference, worth the try for sure. I was never able to measure the pressure after the IC properly, the values with how I measured where to erratic values being it so close to the valves. How much did the pressure drop before the IC?

 

We got 1.7bar before and 1.2 after the IC cores. I believe that even bigger SC made the problem more noticeable. It's interesting that 4.0 coolers would be better in hardcore using. ( you can through the cires ) 4.2s are more efficient for sure but the cores are too dense material for free airflow. I think they work fine with stock SC and 400-450hp. 0.1 - 0.2bar boost drop is normal drop for any good intercooler.

 

Thanks, I misunderstood how was measured, but this is a big difference. Not sure how much hp it would deliver, but 0.5 bar less pressure means less power losses from the SC, at minimum I would guess it should be very noticeable that you have more power on the wheels

Looking forward to next season !

 

Actually we saw 1.9bar ( 28PSI ) just one pull before the 15HU diff went broken That was with empty and a bit ported charge cooler boxes and cool weather. That was bad luck - again. Ignition system is the final one to modify. Stock coils and those small booster boxes can not handle such a cylinder pressures.

 

I'm going to assume you have no idea what I'm talking about with the crankcase vacuum vs positive pressure so I'll leave ya to it.
Good luck in your quest...

 

Different COPs (never found ones that cold it though) or Boost a Spark would indeed be helpful here, for the latter, best to check what the optimal voltage is they can handle, as at some point higher voltage will not aid anymore and only generate more heat reducing the life of the cop.