Topic: Turbochargers

[whyjay94]

if that breather solved the problem then the baffles in your valve cover are plugged badly, so you might want to clean those out as this way you'll get gasses in there

Got H2O/meth injector installed, cooler plugs, changed out tstat to 180 dgr. Took to tuner/dyno guy, spent 4 hrs with him on dyno ( only charged me $200), got everything pretty close. tweaked it more today and I'm happy with it. running approx. 30% meth/water. got approx. 120 HP @ wheel.  Funny thing is I'm running my stock MAP still connected, could'nt get it to stay running good with it unhooked. I tryed it several times, had to disconnect ground and clear ECM.  Got rid of detenation, think that eliminated my blow by, cause its not doing it anymore. got it to 75mph without much trouble and had some left. its pretty sweet.

[sharpxmen]

Got H2O/meth injector installed, cooler plugs, changed out tstat to 180 dgr. Took to tuner/dyno guy, spent 4 hrs with him on dyno ( only charged me $200), got everything pretty close. tweaked it more today and I'm happy with it. running approx. 30% meth/water. got approx. 120 HP  (at)  wheel.  Funny thing is I'm running my stock MAP still connected, could'nt get it to stay running good with it unhooked. I tryed it several times, had to disconnect ground and clear ECM.  Got rid of detenation, think that eliminated my blow by, cause its not doing it anymore. got it to 75mph without much trouble and had some left. its pretty sweet.

so the dyno guy tuned it with the stock map connected? i'm confused, why do that for, you'll need to do it all over again.

[whyjay94]

I had it unplugged for dyno/tuning. after I left it began having problems starting.  I plugged stock map sensor back in with PSC1 piggybacked to it and it does good? I have to turn key on and let check engine light go out and then engage starter. I don't really know why, I read somewhere on a thread where it maybe has to check barometric pressure before start up to set up ECM each time? Its probably 95% and I am enjoying driving it. will be tweaking it as I go from here. 

[sharpxmen]

I had it unplugged for dyno/tuning. after I left it began having problems starting.  I plugged stock map sensor back in with PSC1 piggybacked to it and it does good? I have to turn key on and let check engine light go out and then engage starter. I don't really know why, I read somewhere on a thread where it maybe has to check barometric pressure before start up to set up ECM each time? Its probably 95% and I am enjoying driving it. will be tweaking it as I go from here. 

you have to set the 500rpm cells to match the psc output you would put out with the stock map sensor, see pages 5 to 7 in this doc http://www.splitsec.com/technotes/Fuel-Engine_in_Boost_using_2-bar_Map_Sensor.pdf

[whyjay94]

Thanx, Sharp. When your this close to getting everything running good , its hard to remember all the little details about tuning.

[sharpxmen]

Thanx, Sharp. When your this close to getting everything running good , its hard to remember all the little details about tuning.

no problem, i'm a little worried of you running the stock map in line with the PSC, you'd have a voltage differential between the stock map output towards the PSC map output as the first will always have a higher voltage being 0-1 bar absolute compared to whatever you set your PSC (if i gathered correctly would be something like 1.35 bar or so for 6psi of boost). Not sure if that can "fry" the PSC, but just to be careful (it's not meant to have a voltage input on that line).

[rodgar]

whyjay94 if you dont mind me asking what turbo is that your running?

[whyjay94]

its a Garrett T3 (TB036 out of a late late 80's Volvo 2.3 )

[Rhettq]

Pretty new to all this, so if i ask a stupid please be forgiving.  First, has anyone used a megasquirt EMC?  If so can i get your basic programing?  Second has anyone modified the Cyl Head such that the static CR dropped from 9.2 to about 8.2?  How did it work out?  Thanks

[sharpxmen]

Second has anyone modified the Cyl Head such that the static CR dropped from 9.2 to about 8.2?  How did it work out?  Thanks

i started working on this, but you can't do much on the cyl head side and would have to be on the piston side like the stroker guys do. I did a test on my mill/drill machine with an old piston and came out ok, however that brings up a different issue, since you're making the piston top thinner you'll need better cooling to the pistons so cooling oil nozzles would probably be a good idea. that's as far as i got. the test piston increased chamber gave something like 8.5CR if i remember correctly, all this was just a machining test, i didn't actually built a motor using it.

from the head you'd have to remove way too much material to get it where you want for 8.2CR, you could sink the valves a little but it won't be enough and probably result in loss of performance unless you increase the valve lift by how much you're sinking the valves.

If you search for stroker modded pistons there's tons of info on which you can get and even probably be able to buy a custom kit without the issue of having a piston top that's not as thick as the stock one.

[dwtaylorpdx]

One possibility,, have a set of rods bored offset .020 (Or whatever the CR calculator gives you...) 
So the piston drops in the bore.. Add deep dished pistons. Should be able to get a good drop.


Dave

[sharpxmen]

One possibility,, have a set of rods bored offset .020 (Or whatever the CR calculator gives you...) 
So the piston drops in the bore.. Add deep dished pistons. Should be able to get a good drop.


Dave

if you do that you'll be reducing the quench and with that the chamber efficiency, best to use 2228c Silvolite pistons and dish them to 24cc, that would give you 8.2CR, or 25cc for +30 pistons for the same result. Apparently these are the only pistons you can safely do that as they have thick heads but i have no idea what that is (thickness i mean) - the stroker guys use the 2229 piston which is the corresponding p/n for the 6 cyl.

[ECjeep]

Pretty new to all this, so if i ask a stupid please be forgiving.  First, has anyone used a megasquirt EMC?  If so can i get your basic programing?  Second has anyone modified the Cyl Head such that the static CR dropped from 9.2 to about 8.2?  How did it work out?  Thanks

I was wondering when I was going to see mega squirt on here , petty amazing little computer but a hefty price compared to a Psc and a great deal more knowledge required

[BoringDave]

HOLLY CRAP! I just read all 35 pages.

So, if a guy didn't care about running on gasoline. What would be the problem of running a turbo blowing though a CA225 propane mixer? Other then in stock form impco claims they only handle 5psi boost. I have read that they can be modified to handle 8psi in blow though. Also what about just drawing though one?  I understand why drawing though gasoline carburetors don't work well. Because of the poor atomization of liquid fuel, but propane will always stay in a gas state after the converter valve. Also draw though there would be no way in hell to cool the boost charge.

Dave

[BoringDave]

Also has anyone thought of adding a head gasket spacer? I had to install one the other day on a 3.0l Mitsubishi v6 in a cat GP40 lift truck. My thoughts were instead of installing one to repair a bad head it could be just to lift one up? .020 plus some piston machining get close? I understand that one would need adjustable push rods also.

Dave

Occasionally, a technician may have to machine a cylinder head that's already been machined one or more times. This can cause such problems as mechanical interference of the valves and pistons, detonation or valve timing retardation in overhead-cam engines. The corrective method here is to add a spacer shim between the head gasket and the block to raise the head up to the original specification. Most shims are .020 inch thick, but other sizes may be available, depending on the block.