Posted by zakaron on July 12, 2000 at 20:17:29:
In Reply to: Need advice with a 91 n/a!!!!!! Literally days from becoming a turbocharged n/a posted by alx954 on July 12, 2000 at 13:12:41:
: Well i have finally fabricated exhaust manifold for the turbo ill be putting in my 91 n/a...The thing is that Im going to run about 3-4lbs of boost and wondering how much HP that will give me. Also Ive set up a Starion FMIC that I picked up at the junk yard last week so the boost temp should not be to much of a problem for the engine.Also one quick question is will i have to run some type of oil lines to the turbo or any other things that i have to run to it???
: thanx for any help...Ill postup some pictures as soon as its done and will keep you informed on how it runs.Thanx again
: P.S. its a small turbo for every day driving and occasional drag racing, only light to light though
First of all good luck with this conversion. You are one brave soul :)
The Nelson/Paxton supercharger kit that Chuck and Infini both put out 6.5 psi of non-intercooled boost. With the intercooler you should be able to run a few more psi of boost thru there, but you must be cautious of the high compression rotors. Once you get a feeling of that turbo spooling up and only knowing it is at 4 psi you will be *soooo* tempted to keep turning it up to see how much you can get. You must resist! Or risk blowing something up. Did you put some type of BOV in your setup. I hear good things about finding cheap $40 BOVs from early 90's Eclipses at junkyards. You can easily weld one in the IC piping of your setup. Does that turbo have an internal wastegate? That's something also to consider. Any turbos that I've seen require some type of oil lines to be run through them for cooling (although some superchargers have an enclosed oil system, but I never seen a turbo with that). I'm not sure how you'll do this but on most setups there is a line from the oil pan and one from the oil filter neck. I would also highly recommend hooking up a good boost guage and air/fuel mixture monitor. That way you can see if your getting enough fuel. I would, however, recommend larger injectors- I know that Chuck has 550s in his secondary and still had some ping up around 6K rpm. This is where something like Apexi AFC or some other computer unit would be helpful. That way you can set a/f mix and timing properly. I almost forgot-- you will probably also need a good fuel pressure regulator to push more fuel through the injectors (the Nelson/Paxton SC kit came with one). Also I believe Chuck put a higher flowing fuel pump in to get more fuel through the lines. I hope I got everything... now for HP numbers. Chuck has a cone filter, header & dynomax cat-back for exhaust, and of course the 6.5 psi SC. He is putting 210hp to the rear wheels (~260 @ flywheel). This is on his '88 SE (stock of 146). Since you fabricating your own exhaust manifold, I take it your also putting a custom exhaust one there too? If you have the stock air box and at 4 psi on a stock 160hp engine you may be looking at around 220 at the flywheel (180 rwhp). Now this is just a guess, I could be totally wrong here as I don't have one formula to take into consideration of all variables in your setup. One thing's for sure- you'll be faster than stock!
Again, good luck with your project.
-zakaron