Jump to content
SAU Community

Recommended Posts

4) intercooler has the inlet on the top half of the core, but the outlet on the bottom half of the core, and i'm not sure this is the best for flow...

There is a good reason to be doing this. It helps ensure that all the runners inside the intercooler get equal airflow. So by makign sure air passes through the intercooler evenly you are maximising its effeciency. A good example is an EVO intercooler. Look at how many big HP EVO cars run the std cooler. Hell you see EVOs running sub 58s laps at Tsukuba so that general desing has to have merits (Ditto cooler on LeMans cars etc)

even easier .. T it into your BOV pressure feed .. done

Your BOV normally gets its signal from the inlet manifold. Generally it is recommended that you get your boost signal from the intercooler pipes or pre throttle body. Why thats the case i dont know, but most instruction manuals state thats how to do it. And also i suspect a pressure signal off a BOV would pulsate or be unstable pending what the BOV and the throttle are doing?!?!?

SO just get a threaded barb and carefully drill a hole and tap a hole. Hell if the pipe is alloy and you use a stainless barb etc you wont even need to tap it, just use a neat bit of thread tape. (Saves welding one)

Your BOV normally gets its signal from the inlet manifold. Generally it is recommended that you get your boost signal from the intercooler pipes or pre throttle body. Why thats the case i dont know, but most instruction manuals state thats how to do it. And also i suspect a pressure signal off a BOV would pulsate or be unstable pending what the BOV and the throttle are doing?!?!?

SO just get a threaded barb and carefully drill a hole and tap a hole. Hell if the pipe is alloy and you use a stainless barb etc you wont even need to tap it, just use a neat bit of thread tape. (Saves welding one)

this is true roy, but a pressure feed is a pressure feed..

running a boost crontrol from the thing where boost is measured makes more sense to me.

just say in a higher boost situation where the intercooler is not working efficiantly then you will see a drop in pressure at the inlet plenum and possible rise turbo side of the cooler.. which would cause the wastegate to open further and reduce boost pressure at the plenum .. hence why alot of cars drop boost down the rev range.

thats my reasoning for using a plenum based feed for the boost control..

Edited by Craved

Yeh i suppose it depends on your form of boost control? If its electronic you can still run the MAP sensor straight off your inlet manifold. But the line you use to cheat the wastegate can be the outlet of the turbo or anywhere before the throttle body

If its a mechanical means of boost control then fair enough. But again running a t-piece from the BOV line may mean you end up with 450mm or so of tube, and generally the shorter the hose the more accurate the boost control (I assume thats why they run it off the compressor cover as std on RB20s)

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • For once a good news  It needed to be adjusted by that one nut and it is ok  At least something was easy But thank you very much for help. But a small issue is now(gearbox) that when the car is stationary you can hear "clinking" from gearbox so some of the bearing is 100% not that happy... It goes away once you push clutch so it is 100% gearbox. Just if you know...what that bearing could be? It sounding like "spun bearing" but it is louder.
    • Yeah, that's fine**. But the numbers you came up with are just wrong. Try it for yourself. Put in any voltage from the possible range and see what result you get. You get nonsense. ** When I say "fine", I mean, it's still shit. The very simple linear formula (slope & intercept) is shit for a sensor with a non-linear response. This is the curve, from your data above. Look at the CURVE! It's only really linear between about 30 and 90 °C. And if you used only that range to define a curve, it would be great. But you would go more and more wrong as you went to higher temps. And that is why the slope & intercept found when you use 50 and 150 as the end points is so bad halfway between those points. The real curve is a long way below the linear curve which just zips straight between the end points, like this one. You could probably use the same slope and a lower intercept, to move that straight line down, and spread the error out. But you would 5-10°C off in a lot of places. You'd need to say what temperature range you really wanted to be most right - say, 100 to 130, and plop the line closest to teh real curve in that region, which would make it quite wrong down at the lower temperatures. Let me just say that HPTuners are not being realistic in only allowing for a simple linear curve. 
    • I feel I should re-iterate. The above picture is the only option available in the software and the blurb from HP Tuners I quoted earlier is the only way to add data to it and that's the description they offer as to how to figure it out. The only fields available is the blank box after (Input/ ) and the box right before = Output. Those are the only numbers that can be entered.
    • No, your formula is arse backwards. Mine is totally different to yours, and is the one I said was bang on at 50 and 150. I'll put your data into Excel (actually it already is, chart it and fit a linear fit to it, aiming to make it evenly wrong across the whole span. But not now. Other things to do first.
    • God damnit. The only option I actually have in the software is the one that is screenshotted. I am glad that I at least got it right... for those two points. Would it actually change anything if I chose/used 80C and 120C as the two points instead? My brain wants to imagine the formula put into HPtuners would be the same equation, otherwise none of this makes sense to me, unless: 1) The formula you put into VCM Scanner/HPTuners is always linear 2) The two points/input pairs are only arbitrary to choose (as the documentation implies) IF the actual scaling of the sensor is linear. then 3) If the scaling is not linear, the two points you choose matter a great deal, because the formula will draw a line between those two points only.
×
×
  • Create New...