How much is involved in a twin turbo conversion? What all is there besides the two turbos, two intercoolers, various ducting and BOV's and wastegates?

How much boost can a stock engine take? How much before a lot of tuning is involved?

Since no one makes a kit for my car, I would be piecing it together myself.

Will the MAP work correctly with a positive pressure in the intake?
thanks

 

lots and lots of stuff dude, too much stuff, i dont know but you'd need some serous fabrication hookups

our map does not compensate for boost

and properly tuned i've heard of around 8psi on pump gas., but the psi depends on the turbo/intercooler size.

<small>[ February 06, 2003, 08:56 PM: Message edited by: MIGHTYMOUSE ]</small>

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MIGHTYMOUSE:
<strong> our map does not compensate for boost
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I am not worried about the custom fabrication. I think I can handle that.

Since the MAP controlls injector pulse width, what do you have to do to get it to work correctly when under boost?

 

speed inc. sells the CAS twin turbo kit. Looks like a top quality kit, better then the incon too.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by smokinHawk:
<strong> speed inc. sells the CAS twin turbo kit. Looks like a top quality kit, better then the incon too. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Too bad they don't make one for a 1970 corvette.

 

ah, that explains it, did you put an ls1 in your 70 vette? Maybe speed inc will sell you the headers if its an ls1.

but a good bood to read if your attempting your own build is corky bell's "maximum boost"
should have about all you need to know in there.

ALso noticed your from washington turbo tech (www.turbotechnologyinc.com) does custom installs at there shop, they should be able to make you a kit if you bring your car there.

<small>[ February 07, 2003, 08:53 AM: Message edited by: smokinHawk ]</small>

 

thanks guys. I picked up Maximum Boost and it has only made me want a turbo that much more.

What is the best way to compensate the MAP for having a positive pressure in the intake?

 

The computer mostly uses the MAF sensor. As long as you dont go outside the range of the MAF the computer will no how much air is going into the engine. AT WOT you tweak the PE tables to add extra fuel. Not the best but plenty of cars out there doing it.

Gary

 

Email Tom at Speed Inc. he had a set of turbo headers made for his 69Z perhaps he will sell them since he does not plan to turbocharge that car.

 

I think a rising rate regulator is probably the easiest. It adds 1 lb. of fuel pressure for ever 1 psi of boost. Pretty simple, and pretty reliable.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> How much is involved in a twin turbo conversion? What all is there besides the two turbos, two intercoolers, various ducting and BOV's and wastegates?
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You have turbos, intercoolers, headers, downpipes, then the associated vaccume lines... Basically very straight foward.
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> How much boost can a stock engine take? How much before a lot of tuning is involved?
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Honestly this is just dictated by your ability to curb detonation. If this is solved then the motor should handle quite a bit. I feel most loose their motors cause they are trying to get by with a stock computer when in all reality they need an aftermarket EFI system. I take my views on this from my learning curve and listening to people I really respect. Look at the GN guys for instance. They worked for years with the stock computer and had problems etc.. went through blowing head gaskets etc.. Some started to use fel pro's, accell computers etc... and there headgasket issues are solved... I look at it like this You spend 2-3 k on a aftermarket dfi system... How much does a motor cost?
I have tons of pictures in my web site of turbo systems look around through them and get yourself a simple plan and figure where you can shove things.

Have fun if you decide to build the car up.

Steven <img border="0" alt="[driving]" title="" src="graemlins/gr_driving3.gif" />

 

What are the limitations of with the stock computer? Can't you just tune the computer with something like LS1edit? Is it really necessary to go to an aftermarket EFI system?

 

I personally feel with a turbo system a stock computer would limit your wants from a turbo system and won't come close to getting the turbos in their sweet spots. The major problems come in that it doesnt see boost, so the car will have to be tuned for an area guessing what boost will be there. I am not 100% sure on the ls1 edit and how it works as i have not run it so don't want to make a boat load of guesses, but you are going to either have to run fat when not in boost or lean when in boost as it is not a linear system that you can say raise fuel across the map as easy as it would be to tune a blower car. Another problem comes when you are under load. At highway speeds and up your car will load the turbo more so tuning could get picy there. Just some stuff to look at. I would first start to read when people blow up there combo's what they found, and there reasoning why it blew. I am fairly certain that there has been a few on here that have exploded there motors. (which really stinks)


Just saw you are from gig harbor very nice, if you need any help if you do this give a hollar (just up in bellingham)

 

Now we come to a topic that has been kicking my ***...

Here is are the limits in which we much work:
-Can only run up to 50lb injectors
-Can only run so much fuel pressure
-Only have so much MAF range

So based on my research most of us are limited to ~650rwhp. I'm not sure how much rwhp we can safely run with 50 lb injectors and say 65 lbs of fuel pressure. I'm not sure 700rwhp is a safe number with 50's. To boost fuel pressure I'd probably have to run two fuel pumps and have one come on around 4000 rpms.

 

70ls1, unless you are planning on going all out, the stock computer will serve its purpose like red 99 said.. the maf will cover you for about 4psi of boost, then you have to add fuel in the wide open table for the rest... just keep an eye on things with a diagnostic scanner like a-tap.

rob raymer ran 707rw on msd 50# injectors,stock computer but that doesnt mean that anybody can lol.

psj: -both speed inc. and y2khawk sell injector drivers that work with our stock computers to run the big a$$ injectors no problem
-your going to run out of maf at about 500rwhp no matter what you do unless you trick the computer with an overly large maf housing or a custom maf like y2khawk did from pro m.. they can sell you the exact same thing that will work just fine with the stock computer as well... just needs tinker time in edit. everybody that does not do this will just have to tune in the wot table in edit.. which isnt that big of a deal, just have to be careful as you go.
-you dont want to run more than 70-75psi of fuel for sure, its difficult for the injectors to work properly/consistently, but lots of 7 second cars running fuel injected, so thats not our problem <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

So the stock MAF is good to about 500rwhp? That is my goal. 450-500rwhp. I have done a few calculations and it looks like that will require 8-10 lbs of boost. Are these realistic numbers? I would like to do all of the tuning with LS1edit. How do you determine what size injectors to run? I am assuming the stock ones are no where even close to being enough.

The mechanics of the whole turbo project will be no problem. I think most of my difficulties will be with the fuel delivery and the tuning.

I appreciate all your comments and thanks.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Pro Stock John:
<strong> Now we come to a topic that has been kicking my ***...

Here is are the limits in which we much work:
-Can only run up to 50lb injectors
-Can only run so much fuel pressure
-Only have so much MAF range

So based on my research most of us are limited to ~650rwhp. I'm not sure how much rwhp we can safely run with 50 lb injectors and say 65 lbs of fuel pressure. I'm not sure 700rwhp is a safe number with 50's. To boost fuel pressure I'd probably have to run two fuel pumps and have one come on around 4000 rpms. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">impedence converter
harlan tuning

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by neat:
<strong> I think a rising rate regulator is probably the easiest. It adds 1 lb. of fuel pressure for ever 1 psi of boost. Pretty simple, and pretty reliable. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Well, in doing this, you aren't adding any more fuel. You raise fuel pressure 1psi per 1psi of boost, the main reason for this is that the fuel injectors now have to inject fuel into a pressurized manifold. The increase in fuel pressure accounts for this. If you want to go to an FMU setup, eventually you'll find you'll be pushing fuel pressure pretty high, and the pump output will drop off at that point.