Turbo Meister Posted March 8, 2004 Share Posted March 8, 2004 The engine is back in my 72 Z after replacing the 10:1 CR pistons with more "Turbo Friendly" 8.3:1 CR ones. Unfortunately, this will reduce max power but it will be acceptable if the car's drag strip performance becomes more consistant and predictable. The lid has been left off the pressurized intake air box for the photo so that the placement of the carb in the box can be seen. Hanns Quote Link to comment Share on other sites More sharing options...
j260z Posted March 8, 2004 Share Posted March 8, 2004 that looks amazing. what size exhaust are you running? Quote Link to comment Share on other sites More sharing options...
silicone boy Posted March 8, 2004 Share Posted March 8, 2004 You were running 10:1 compression without intercooling and you got away with it?! What were you running? Jet fuel? I was so worried about 9.8:1 that I recently ordered a set of cylinder heads with a larger chamber volume to lower the SCR to 9:1 (my current heads have never been run, so I can sell them and come out almost even). Maybe I was a little rash in my decision, but I sure feel a lot more secure, so I guess it's worth the trouble. Quote Link to comment Share on other sites More sharing options...
Turbo Meister Posted March 8, 2004 Author Share Posted March 8, 2004 that looks amazing. what size exhaust are you running? I'm running a full 3" dual exhaust from the down pipes all the way over the rear end into big FlowMaster mufflers and out the back. I drive real slow over Speed Bumps because the exhaust is low. Hanns Quote Link to comment Share on other sites More sharing options...
Turbo Meister Posted March 8, 2004 Author Share Posted March 8, 2004 You were running 10:1 compression without intercooling and you got away with it?! Ben,What makes you think I got away with it. I have had to replace some molten pistons when my ignition timing was too high and I also learned to dump in plenty of fuel to keep the engine happy. The Z runs good on the street on 91 0ctane but I dont often punch it without some 108 in the tank. You are better off with the 9:1 CR you have now because it will provide some margin for error. How is the exhaust fabrication coming? I thought about your turbo placement and believe you could duct the turbo intakes under the cowl area to pick up cool air. I saw a V8Z that had the air cleaner to the carb ducted to that area. Hanns Quote Link to comment Share on other sites More sharing options...
silicone boy Posted March 8, 2004 Share Posted March 8, 2004 Hanns, Nice to know that Ii'm not such a nervous nellie after all. Great idea about the intakes. I may just do that. The project is delayed a bit cause I'm moving, but I'll get back to it soon. By the way, how are you feeding that beast with fuel? I'll have to upgrade my fuel delivery system I'm sure. Quote Link to comment Share on other sites More sharing options...
John Scott Posted March 8, 2004 Share Posted March 8, 2004 The engine is back in my 72 Z after replacing the 10:1 CR pistons with more "Turbo Friendly" 8.3:1 CR ones. Unfortunately, this will reduce max power but it will be acceptable if the car's drag strip performance becomes more consistant and predictable When I was dabbling with the supercharger, reducing comp ratio would allow more max hp by allowing more boost. A little less on the bottom, but much bigger gains on the top end. Regardless, that is a beautiful set up. Hope you're good friends with the tire store! John Quote Link to comment Share on other sites More sharing options...
Turbo Meister Posted March 9, 2004 Author Share Posted March 9, 2004 how are you feeding that beast with fuel? Ben, I'm using an Aeromotive 350 gal per hour pump with bypass and it's cranked up to 28 psi for racing but only 15 psi on the street. It is easily adjusted while the car is running. However, you will have to use a high pressure pump for you FI engine. Hope you get moved quickly so that you can get back to what's important...building your TT monster. Remember there are guys waiting for your prototype system Hanns Quote Link to comment Share on other sites More sharing options...
stony Posted March 9, 2004 Share Posted March 9, 2004 that is the best thing about a turbo motor is its drivability when not under booste. Hanns you can get the same if not better performance buy lowering the compression and turning up the booste.... good luck. Quote Link to comment Share on other sites More sharing options...
Turbo Meister Posted March 9, 2004 Author Share Posted March 9, 2004 that is a beautiful set up. Hope you're good friends with the tire store! John,Thanks for the complement. I agree about cranking up the boost being a benefit of lower compression. I'm currently searching for affordable and smaller Turbine housings so that the total boost can be increased. Yes, I already need new rear tires but I don't know why they wear out so fast. Hanns Quote Link to comment Share on other sites More sharing options...
Turbo Meister Posted March 9, 2004 Author Share Posted March 9, 2004 that is the best thing about a turbo motor is its drivability when not under booste. Stony,You are correct about the driveability. When I'm on the freeway at 70 mph I'm not under boost unless I punch it, and just cruising around, the Z acts like it only has a naturally aspirated engine. Hanns Quote Link to comment Share on other sites More sharing options...
Guest Siddhartha Posted April 20, 2004 Share Posted April 20, 2004 Turbo Meister, do you have info about your build on a webpage? Quote Link to comment Share on other sites More sharing options...
Turbo Meister Posted April 21, 2004 Author Share Posted April 21, 2004 Turbo Meister, do you have info about your build on a webpage? No, I don't, however if you search for my postings you will find several entries where I listed information. If you can't find anything you can post questions on specific info you need and I will gladly answer them. Hanns Quote Link to comment Share on other sites More sharing options...
Guest Siddhartha Posted April 21, 2004 Share Posted April 21, 2004 Hehehe, I found it shortly after I posted, thanks. Man, that's pretty sweet! DSM turbos, huh. I can get those REAL cheap here in Orlando. Quote Link to comment Share on other sites More sharing options...
Turbo Meister Posted April 21, 2004 Author Share Posted April 21, 2004 DSM turbos, huh. I can get those REAL cheap here in Orlando. No, those are 14 year old Rajay turbos, which have been popular in the past for Airplane engines. These were given to me by a friend but there was lag due to too large turbine housings. Still, I ran 116 mph in the 1/8th mile at Irwindale Raceway, 3 weeks ago. I just installed smaller turbine housings and now I have almost instant boost. I haven't raced it since the installation but it should be even faster if The Z hooks-up. Hanns Quote Link to comment Share on other sites More sharing options...
Guest Siddhartha Posted April 21, 2004 Share Posted April 21, 2004 what would you recommend, this is a first time project for me, wait for an ls1 and go N/A or go for the lt1 and TT it? Quote Link to comment Share on other sites More sharing options...
Turbo Meister Posted April 21, 2004 Author Share Posted April 21, 2004 what would you recommend, this is a first time project for me, wait for an ls1 and go N/A or go for the lt1 and TT it? What is your goal with the car? If it's a daily driver and occasional racer you can't lose with the LS1. Although I enjoy driving my TTZ on the street, I cannot find anywhere but the dragstrip to safely jump on it because there is too much torque to hook-up on the street. The installation also requires custom exhaust system and mine is very primitive due to budgetary constraints. But for pure power there is nothing like a TT setup. Hanns Quote Link to comment Share on other sites More sharing options...
Guest Siddhartha Posted April 21, 2004 Share Posted April 21, 2004 It's going to be a daily driver that's taken to the strip fairly often and driven on the highway alot. Actually, I've been looking at the sr20det recently also. Quote Link to comment Share on other sites More sharing options...
Turbo Meister Posted April 21, 2004 Author Share Posted April 21, 2004 It's going to be a daily driver that's taken to the strip fairly often and driven on the highway alot. Actually, I've been looking at the sr20det recently also. Well, I like V8's, so I would recommend the LS1. Although the sr20det can be made powerful, it has to work so much harder and consequently wears so much more especially for a daily driver. Hanns Quote Link to comment Share on other sites More sharing options...
Guest Siddhartha Posted April 21, 2004 Share Posted April 21, 2004 this is true, but srs are quite durable, and I figured the powerband would be AWESOME for a Z.... **** it, I can't resist something that sounds like satan himself!!! Quote Link to comment Share on other sites More sharing options...
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