intercoolers and boost pressure

[wbski007]

Anyone know about how much more HP a intercooler will add to a 2.5?, also what kind of boost pressure should I have,I'm running about 9lbs now,what is tops for my 2.5??

[BUSHPIG]

hey m8 if the 2.5 is any thing like the 2.8 with a liltle adjustment of the injector pump,intercooler and a good 2 1/2" exhaust its safe to runn it to about 15psi.
my 2.8 bighorn got a switch iv put in to change boost from factory to 15psi at the flick of a switch. verry handy for towing if you come across a bigg hill or if you just pulling a shit load of weight.

[geeves]

Why bother switching. Even on 15 pound boost the turbo only creates the boost it needs so at light throttle cruizing it will still only be creating 5 pound or so

[wbski007]

I,ve turned my injector pump in one full turn,does that sound about rite to you guys or could I go more,I don't want to go to crazy with the fuel tho, when I'm pulling a hill with my camper the most I get on my boost gauge is 9lbs. Here is a photo of my wastegate,it has no vacuum line going to it,so how would I adjust it for more boost??

cheers, Wayne

[turnturn]

I'm not sure about actual HP gain figures but I liken the change after fitting an intercooler to what I call "about half a gear".
On hills that you formerly were in no mans land between 4th and 5th you will probably now get up them in 5th.
Of course intercoolers are only any good with airflow through them so changes are most notable in the higher gears/higher speeds.
I think that it probably increased my fuel economy slightly as well.
The above info is based on a 2.8 (4jb1t).

[BUSHPIG]

Why bother switching. Even on 15 pound boost the turbo only creates the boost it needs so at light throttle cruizing it will still only be creating 5 pound or so

im switching it because im running a custom exturnal wastegate dumping into a 2 1\2" exhaust set up for boost control. so im hitting 10 psi even on verry light throttle and it just holds 10 with no spike or boost drop even under full load. so if i dont flick switch back to 10psi im running 15psi even on light throttle and under full load to.

the power increese if verry noticabull hitting the full 10psi on light throttle make's it verry good for towing my race cars.
Oh btw im hitting full boost by 1870rpm and it holds all the way thro to 3850rpm then drops 1 1\2psi by 4000rpm

ill get a photo of my set up when i get my cammera back.

[98Rodeo]

Hi Wayne,
I ahve a manual boost controller in my Rodeo (Pickup) and have wound it and am now running 12PSI
it connects to the actuator line off a t-peice between the turbo and the wastgate actuator.
http://cgi.ebay.com.au/Turbotech-manual ... 286.c0.m14

there is a link to the one i bought. not sure if you could get it delivered to over there.

Geoff

[geeves]

You full throttle boost speeds are about the same as mine but with a restrictor in the boost gauge line I only show 14psi. Without it shows 17 but at idle the gauge makes more noise than the stereo.

[wbski007]

OK guys,everything you said was good,but how do I get more boost out of mine,I have no vacuum line going to my wastegate,it just has a plastic cap on the end????? see photo,and has any of you turned up your IP, I gave my fuel screw one full turn in,I didn't want to go too far,I'm used to working on 5.9 Cummins,I can turn IP fuel screw in 2 1/2 times on them, but I don't know how far I can go with this 2.5?

cheers Wayne

[pig75]

There might be some kind of adjustment under that cap?
What is the number of the turbo?

[geeves]

Best way to tweak this is a little at a time like you are doing then after each adjustment give it a full thottle run. When you get lots of smoke back it off till the smoke stops.

[wbski007]

OK PIG75,turbo is a IHI, spec# VICI/9809, part# 8971656450 don't know if that helps any? I'm going to try and get plastic cap off today,hopefully it won't break,wish me luck mates.
Geeves,I think I went far enough with 1 turn,when I really get into it now I get pretty good smoke,nothing crazy tho,just about rite. thanks to you both,Wayne

[wbski007]

OK fellows,got the plastic cap off,looks like it is adjustable,almost the same setup as the fuel adjustment on the IP pump,I'll try going in first and see what that gives me ??
Photo is not to clear,but I think you get the idea,small set nut with adjustable screw.

[wbski007]

Well that didn"t work,seams it was all the way in already,I loosened the nut but screw won't go in any,just out but that puts less pressure on spring so I don't see that working??? The metal disc you see in the photo pushes in easy with very little spring tenison, any ideas anyone??
Wayne

[wbski007]

I guess I'm going to answer my own question, after some thought the nut only holds the spring on its really not adjustable after all,probably have to get a spring with more tension ?,that should be fun finding one of those, I took the nut and cap off and there was just a spring behind it,added two flat washers between spring and cap and put it back together,cross your fingers. Gosh this is just too much fun.
Two washers did the trick,just got back from test run,now have 14 lbs of boost, it runs like a raped ape, God I love when things work,yeppie cy yea Wayne

[jezza]

Why don't you use a die and thread the rod slightly more so you can screw it down more?

[wbski007]

Don't have to jezza,but thats a hellava good idea,why didn't I think of that,but anyway the two flat washers behind the cap did the trick,but I just might take your advice and do that anyway,that way I can adjust it with out taking it apart thanks mate,cheers ,Wayne

[gomulletgo]

Why bother switching. Even on 15 pound boost the turbo only creates the boost it needs so at light throttle cruizing it will still only be creating 5 pound or so

im switching it because im running a custom exturnal wastegate dumping into a 2 1\2" exhaust set up for boost control. so im hitting 10 psi even on verry light throttle and it just holds 10 with no spike or boost drop even under full load. so if i dont flick switch back to 10psi im running 15psi even on light throttle and under full load to.

the power increese if verry noticabull hitting the full 10psi on light throttle make's it verry good for towing my race cars.
Oh btw im hitting full boost by 1870rpm and it holds all the way thro to 3850rpm then drops 1 1\2psi by 4000rpm

ill get a photo of my set up when i get my cammera back.

10psi at light throttle?! full boost by 1870rpm!!!

That sounds awesome I've checked out your members rigs page, not much info on your setup, could you please tell us all your engine mods? pictures of your setup? Why have you gone for an external wastegate? How have you got the thing boosting so high at such low rpm? I would be wrapped to have full boost that low in the rpm range and 10psi at light throttle would be great too What turbo are you running? Please tell me your secrets