twisselman1968

I've bought a 749 computer and the pocket romulatour and I'm going to run a medium sized turbo on my 91Z that has 246K on it. But I don't think it is the original motor because it runs really good no smoke even at start up and it does not leak any oil. The only mods I've done soo far are LT1 injectors,removed the complete intake and had it hot tanked ,because it was really nasty because the EGR valve was stuck open when I bought the car, while i had the intake off I cut the EGR bumps out from behind the throtle body and I opened the holes in the upper plenuem up and I opened the lower intake up a little with a carbide tree and hit it with a cross buff to polished it up inside real nice . As far as I know the bottom end is stock but??? I have no idea, Is there any one out there who is runnin 6-8 lbs of boost on a stock tune port rotating assembly? And can anyone tell me if 30lbs an hour injectours will keep up with 8 lbs off boost? any info or links would be awsome I just haven't hade any luck with the search engines on this......hope some one can help me

Abird4u2nv1

iTrader: (-1)

If I were you, I'd hook a oil pressure gauge to that motor and see what you have, then use a compression test and test all your cylinders, find out how your motor is. You don't wanna throw a turbo at a motor with that many miles unless your positive its a low mileage engine. I'd hate to see all that work go into the car then the motor blows....

Crazy Firebird Kid

It actually wouldn't be that bad of an idea. He can fab everything up and bolt it on, and if he blows the motor then he just unbolts everything, pulls the motor, puts a new motor in and bolts everything back up.

89JYturbo

Yeah, learning the tuning and turbo tricks on a tired motor is fine. If you goof up, at least you haven't lost an expensive engine.

I'm a big fan of turbocharging stock engines. My TT IROC L98 is bone stock from the plenum to the pan. Even the exhaust manifolds are stock, but modified to mount the turbochargers, It has 97k miles on it, and it is my original engine (numbers match, I checked back when I was still somewhat concerned about orginality- my priorities obviousely changed). Its not a real power house, but drives like stock and runs 12.5's at 115mph all day with just 6psi of boost. Not to mention over 20mpg! It uses 24# injectors and a stock ECM, fuel is added under boost with a Vortech SFMU. I have anothe rpost on here, documenting my progress at at getting it to go 11's in street trim on a stock L98. I'm convinced I will achieve my goal by the end of the summer, but I want to do it in an organized fashion, without just throwing money at it.

I also turbocharged the stock 2.8 in my '89 Z24 with over 180k miles on it. It ran many low 14's and a lone 13.9, with a best trap speed of 103MPH (10psi boost). Then I swapped in a 3400 V6 from a '02 Venture mini van (again, stock) and it ran mids 12's 20+ passes and I drove it daily for a year (14k miles or so) before it broke a piston skirt. Stock stuff runs with a little boost! Oh, and the Z24 now has over 198,000 miles on it and it still has the original tranmission and axles, the trans was never even opened up. I am in the process of building a new 3400 for the Z24 to take boost reliably. My daily driver need to be as reliable as a brick, which is hard to do in a car making around 3 times the power it was originally designed for

superirocz

iTrader: (5)

Last summer I put 10k on my stock L98 with HSR intake
ran a FAST ecm lots of fuel and 13psi with 3:08 rear and 6-speed ran 12 flat at 123 all day long engine never failed
Twin t-70s
3350# with out driver

twisselman1968

89JYturbo I actually came across your home page a while back on accident and its what gave me the idea of doing this I didn't even know you were on this website but when you started talking about the turbo 3400 swap and stuff I checked your homepage and couldn't believe it, I'm going to check my cylinder pressure and a friend of mine is going to let me use his leak down tester to see how the rings are but the oil pressure is about 15lbs idling warm and about 50-55lbs going down the road so I think the bottom end is in good shape I'm running Mobil 1 5W30 in it but I'll be switching to 15W50 know that its getting warmer out

twisselman1968

thanks for the feedback so far though and anything else keep it coming. I think I'm going to try running my 1227749 computer and a set of either 24 or 30 lbs injectors and I found two turbo coupes when I was shopping today at the junk yards and got a good deal on the inter coolers so I think I'm going to run both of them and see how it works just have to find some where to put them any suggestions on any of this stuff I would appriciate...and is there anyway my trans is going to hold it still scratches second and it will shift from third to fourth at wide open throttle at about 115 mph, everything I've always read about these 700R4's said they wouldn't shift to fourth wide open but mine does...every once in a while I'll have to lift just barely but once it shifts I can put it back on the floor??? I'm a little confused about this... but if anyone can shed some light please do thanks

ttypecamaro

iTrader: (2)

My stock (rebuilt) 700r4 lasted two months behind the turbo motor. My best 1/4 was 13.2@109 because it wouldn't shift to 3rd unless I totally let go for a second or two.
I used two Turbocoupe intercoolers on both of my twin turbo setups. They were suprisingly efficient. Here are some pictures of them mounted behind the bumper. They fit pretty well.

twisselman1968

thank for the pics man I like that I think thats how I'll try to do it

ttypecamaro

iTrader: (2)

On my car they were actually 1/4" too wide (combined) to fit there, so I ground 1/4" off of one of the flanges to fit them like that.

twisselman1968

no problem I can handle that thanks for the heads up though