schwiplarkin Posted April 29, 2005 Share Posted April 29, 2005 my latest l28 turbo project is almost ready to go and i am courious about what boost levels some of you are running. I plan on running around 20lbs once everything is tuned correctly. Quote Link to comment Share on other sites More sharing options...
Sparks280zt Posted April 29, 2005 Share Posted April 29, 2005 I hope you have forged pistons, i dont think the stock ones can take 20lbs for a long time. What is your set up? Quote Link to comment Share on other sites More sharing options...
schwiplarkin Posted April 29, 2005 Author Share Posted April 29, 2005 well my setup is alittle different, so its kind of an experiment, its a 83 l28et rebuilt with arp rod bolts and head bolts, 2mm steal head gasket, comp = 7.85:1, big ported head with insky cam, modified intake, water injection, t3/t4 turbo,tial wastegate, and here is the fun part, a holley 750 draw through carb.a direct port nitrous system that i have will be added in the future, and to answer your question yes they are stock pistons, i know thats not the smartest thing but im so broke. i wish i could post pics but i dont know how.. Quote Link to comment Share on other sites More sharing options...
Guest DoTheDrew888 Posted April 29, 2005 Share Posted April 29, 2005 You'll be even more broke if you blow that engine up and have to start all over. It sounds like a pretty cool setup but be careful man. Quote Link to comment Share on other sites More sharing options...
schwiplarkin Posted April 29, 2005 Author Share Posted April 29, 2005 yeah yeah yeah,,, ive argued with myself about that, and i lost!! i am going to take it slow,, start with ten then creep up Quote Link to comment Share on other sites More sharing options...
slownrusty Posted April 29, 2005 Share Posted April 29, 2005 I am about 45minutes away in Colorado Springs...I am running 10psi safely on my 145,000mile L28ET on my ZXT and will eventually not go more than 12-14psi for reliability and for the sake of keeping the rods in the engine and not blown out on the road. At 10psi my car is pretty darn quick too. Not trying to be an *** but: 1) you make no mention of an intercooler??? 2) 20psi...??? that is a freaking lot of psi - are you for real? 3) Why didn't you get the ARP stud conversion kit instead of the bolts? 4) Can the Holley carb take that much boost with a draw through set-up. 5) You make no mention on your bottom end, forged , stock???? 6) Ported intake, which intake, how is it ported??? PLUS Nitrous!!!.... Good luck...hope you don't end up making a paperweight or boat anchor out of your engine. Quote Link to comment Share on other sites More sharing options...
schwiplarkin Posted April 29, 2005 Author Share Posted April 29, 2005 thanks for actually replying slownrudty,, i really do want to know what boost levels people are running. anyways,, yes i am serious,, remember this is an experiment, this is not a daily driver, for the track only , and when it breaks i have two others to drive. to answer your questions, 1 it is not safe to run an intercooler with this system because it is a carb system, the turbo , intercooler, and the intake will all be full of fuel,, if it were to backfire BOOM! 2. i know that is alot, im going to work my way up as far as possible, i want to take it to the limit.3. i honestly thought that the bolts were better, am i wrong?? 4.yes they can, my brother runs a 54 vw bug at bandimere 10.8 @134 with the same exact setup, a guy i work with runs a bug at28lbs,, honestly.. the carb just has to be boost referanced. 5. the bottom end ,, yes i know it is a bad idea but it is stock. i know a guy that is running 14lbs on a stock block that has never been rebuilt. 5. the intake is just a 76 n/a that i cut up and welded , by ported i ground out the runners to match the big head intakes. I'll post pics and videos once i learn how,, by the way i was headed to the springs yesterday with my boss the pick up a bunch of motor cores, we got stuck right before monument hill for two hours because of all the wrecks,,, later!! Quote Link to comment Share on other sites More sharing options...
schwiplarkin Posted April 29, 2005 Author Share Posted April 29, 2005 i forgot to add that i am running a water/alcohol injection insted of intercooler Quote Link to comment Share on other sites More sharing options...
Corzette Posted April 29, 2005 Share Posted April 29, 2005 10.8 at 134??? That bug must get no traction to speak of because I ran a 10.9 at only 122.....please explain... Quote Link to comment Share on other sites More sharing options...
schwiplarkin Posted April 29, 2005 Author Share Posted April 29, 2005 i just got off the phone with my brother and it was actually a 10.34 at 133 and that is a mile high,,, Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted April 29, 2005 Share Posted April 29, 2005 20 psi for 1/4 mile with the proper setup (NO PINGING) should give you a few runs. Dont expect to do it regularly. One little detonation and kiss goodbye to the piston, the rod, the block, the head, and/or all of the above. Have fun and video tape it PLEEEEZ! Quote Link to comment Share on other sites More sharing options...
ww Posted April 29, 2005 Share Posted April 29, 2005 On 104 octane I run up to 25 psi but I have all forged internals... nearly everything. I've contemplated forging a dip stick just for the sake of consistency... On California pump gas, I won't go over 15 psi and usually run at 10 psi. It'll still smoke most cars at 10 psi and when someone gets cocky it goes up to 15 psi. No one has been cocky enough to make me want to take it up to 25 psi on the street. Draw throughs are cooler as a result of the fuel coming into the compressor side with the air charge. The fact that your doing water/alcohol injection will help even more. The drawback is that you get fuel pooling in the bottom of the turbo compressor housing... I prefer a blow-through setup with intercooler, but that has it's own set of problems. Quote Link to comment Share on other sites More sharing options...
schwiplarkin Posted April 29, 2005 Author Share Posted April 29, 2005 it'll be on video i promise Quote Link to comment Share on other sites More sharing options...
510six Posted April 30, 2005 Share Posted April 30, 2005 Remeber that on nitrous there is always some amout of boost creep. With 20psi on stock pistons it sounds like a receipe to put a rod through a block.If the motor is setup correctly the N20 should make a great intercooler. Quote Link to comment Share on other sites More sharing options...
Guest 73Turbo240z Posted April 30, 2005 Share Posted April 30, 2005 With my motor, (coatings, forged pistons, polished l24 rods, l28 crank, arp hardware throughout, NPR intercooler, MegaSquirt n' Spark, MSD 6AL *unless i find a alternative subsitute to be a dual stage rev limiter*, AZ car flywheel, JSK rail, AZ car spacer, 60mm tb, SVO injectors, AZ car pulleys, and a undecided combo head, i'll be aiming for 17-18psi on a 60-1 or holset HX35y street, with 25psi on 114 for track... that's if the clutch/trans/rear end/driveshaft/halfshafts survive Quote Link to comment Share on other sites More sharing options...
jeffp Posted April 30, 2005 Share Posted April 30, 2005 Well I consistantly have run 20psi of boost with the car. The highest boost level I have run is 27psi on the turbo I built and then it was out of air. You will be happy with 20-23psi of boost. That level should take just about anything factory, or on the street. Quote Link to comment Share on other sites More sharing options...
slownrusty Posted April 30, 2005 Share Posted April 30, 2005 Jeff but you have a completely built super solid bottom end! Quote Link to comment Share on other sites More sharing options...
drzed Posted April 30, 2005 Share Posted April 30, 2005 I run 19 psi on a stock bottom end with 225 000 km on it. Put fresh bearings and rings in it and its ready to go. I'm sure that the first thing to go will be one of the factory cast pistons but so far so good. It's got 70 - 80 passes at the track and several thousand street miles on it. Last night it ran an 11.67 at 116 with a used set of slicks I picked up at the swap meeting last fall - traction is great! When it fails I'll let everyone know what it was. Next stop 21 psi. Quote Link to comment Share on other sites More sharing options...
slownrusty Posted May 1, 2005 Share Posted May 1, 2005 Wow 19psi on a stock bottom end...you guys have much bigger cahonies than me! Yasin Quote Link to comment Share on other sites More sharing options...
pallnet Posted May 1, 2005 Share Posted May 1, 2005 I have run 12psi without any problems. the air was 55' in my intake and I was running 93 octane. I tool around at 6.7-8psi and set it at 10psi if the air is in the 60's. The weather is changing and soon it will be 100' around here in southern Louisiana so, the boost levels will be low. The engine is has stock flat top pistons shaved this that and the other, a few tricks here and there. I'm running SDS, 8.9-1 compression and traction is a major issue. I know the boost levels don't sound like much but you have to factor in my compression.. Quote Link to comment Share on other sites More sharing options...
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