Z-Gad Posted February 2, 2010 Share Posted February 2, 2010 How do the other pistons/ringlands look? Was it isolated to that one piston? Your timing was uber conservative, so I would suspect fuel... maybe that particular injector, or wiring connector. If is was isolated to that one slug, then perhaps a flawed cast piston... Might be worth a set of forged pistons (then you can set your compression ratio where you like...I prefer 8:1 giving me some cushion to run higher boost on straight pump gas) Regards, Mike Quote Link to comment Share on other sites More sharing options...
dustin280zx Posted February 2, 2010 Share Posted February 2, 2010 There is no knock control with the MS unfortunately, but I do have data logs. I was running 10 psi of boost, and roughly 8 - 9* of timing at that boost level. With a splash of 100 octane for insurance. I'm debating on weather or not I want to build the LS1, or go find a 5.3 stocker to throw in... Decisions decisions. What's the compression ratio? Find a 5.3 to throw so you can play more and get the tuning down while building your other LS1. I know a complete 5.3 can be had around here for 500 or less. Then you'll have the tuning down so when your ready to drop in your built motor you can really make some power and won't have to worry about hurting a motor you have some money in. Quote Link to comment Share on other sites More sharing options...
Cable Posted February 2, 2010 Share Posted February 2, 2010 What's the compression ratio? Find a 5.3 to throw so you can play more and get the tuning down while building your other LS1. I know a complete 5.3 can be had around here for 500 or less. Then you'll have the tuning down so when your ready to drop in your built motor you can really make some power and won't have to worry about hurting a motor you have some money in. Stock LS1's have 10.0:1 CR. I agree about going with a 5.3 for the time being. 5.3's have 9.4:1 compression so they are a little more 'boost friendly' vs a stock LS1. If you wanted to lower the compression even more you could put your stock LS1 heads on the 5.3 and drop the compression even more. Another reason I like 5.3 for boosted apps is because they have the thickest cylinder walls of any production Gen III/IV, minus the LSx block. Plus if you desired, 5.3's can be punched to LS1 bore size so aftermarket pistons are much easier to come by. Either way you go, you have plenty of options. Quote Link to comment Share on other sites More sharing options...
ColtGT4g63 Posted February 3, 2010 Author Share Posted February 3, 2010 Thanks for the input and option suggestions. I have located a 5.3 long block that I will be picking up this weekend. I will be throwing my Ported heads off my LS1 onto it and throw it back in the car. I am pretty capable of tuning the car already, but of course the more time spent tuning the the better off you are with it. My AFR at WOT 5-6psi of boost was 11.0-11.2:1, as boost went up to 10psi the AFR goes down to 10.2-10.4:1 and holds steady to red line. Too bad the spare 5.3 motor that I had intended on using as a back up for the Datsun, went into my truck! haha Quote Link to comment Share on other sites More sharing options...
yessir Posted February 4, 2010 Share Posted February 4, 2010 Are your steam tubes blocked?( aluminum tubes that run from one head to the other) Quote Link to comment Share on other sites More sharing options...
Cable Posted February 4, 2010 Share Posted February 4, 2010 Are your steam tubes blocked?( aluminum tubes that run from one head to the other) I seriously doubt that had anything to do with it. Although this often a hotly debated issue, especially on LS1Tech, I have yet to hear of a first hand experience where some damage was done to their motor directly (with no other related issues) because of not having the steam tubes hooked up correctly. I have run two GEN III's without the the steam tube hooked up to the radiator for thousands and thousands of miles without any bad results. Just my 2 cents. Quote Link to comment Share on other sites More sharing options...
ColtGT4g63 Posted February 4, 2010 Author Share Posted February 4, 2010 Why in the world would they call that thing a steam tube??? And how would that cause, in any way, damage to the engine? Quote Link to comment Share on other sites More sharing options...
yessir Posted February 4, 2010 Share Posted February 4, 2010 Ive been told by a few people that the #7 cyclinder naturally is the hottest on gen 3 engines and if you block off the tubes it amplifies the heat issue. Hot cyclinder=detonation= above pictured piston. Quote Link to comment Share on other sites More sharing options...
ColtGT4g63 Posted February 5, 2010 Author Share Posted February 5, 2010 I see, I have several holes drilled in my T stat, warmest temps I saw at the track were.. 180* roughly. Quote Link to comment Share on other sites More sharing options...
ColtGT4g63 Posted February 8, 2010 Author Share Posted February 8, 2010 Well... Picked up my 5.3 iron motor over the weekend. Need to get some head gaskets and arp hardware, then its re-assembly time. This time when it goes back in, it will be auto and have a different turbo hanging off the front. Quote Link to comment Share on other sites More sharing options...
Blown77Z Posted February 8, 2010 Share Posted February 8, 2010 We should call you Mr. Moneybags O.o Can't wait to see the new setup! What tranny are you going to be using? Quote Link to comment Share on other sites More sharing options...
dustin280zx Posted February 8, 2010 Share Posted February 8, 2010 Are you using the s475 you had? Quote Link to comment Share on other sites More sharing options...
ColtGT4g63 Posted February 9, 2010 Author Share Posted February 9, 2010 We should call you Mr. Moneybags O.o Can't wait to see the new setup! What tranny are you going to be using? Haha! The entire long block with both manifolds, fuel injectors / rails, throttle body, coils, all sensors, flex plate, alternator, ect... cost me 350$ Which I may be able to get close to back after selling off all the crap I don't use. I purchased the BorgWarner turbo a while back off of "theturboforums" for 450$ shipped. I will be using a TH350, I have already disassembled it, replace all the clutch's / seals, and installed a shift kit. This will be my first time experiencing a high horse power automatic car. Are you using the s475 you had? I picked up a BW S400 with the 75mm compressor a little while back. Exhaust side is a 1.32 with T6 housing. Quote Link to comment Share on other sites More sharing options...
ColtGT4g63 Posted February 13, 2010 Author Share Posted February 13, 2010 So I pulled apart the LS1 a little more, found another piston in there with broken off ring lands. #7. Quote Link to comment Share on other sites More sharing options...
ColtGT4g63 Posted February 26, 2010 Author Share Posted February 26, 2010 Teaser pic of the new set up! Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted February 26, 2010 Share Posted February 26, 2010 Don't be surprised if that 1.32 a/r T6 housing is a little laggy. Tighten up the harness and have the car pointed straight when it comes on Quote Link to comment Share on other sites More sharing options...
ColtGT4g63 Posted March 6, 2010 Author Share Posted March 6, 2010 Its aliiiiiiivee!!!!! Here is the extent of my exhaust! Surprisingly not that loud. Quote Link to comment Share on other sites More sharing options...
sq_creations Posted March 12, 2010 Share Posted March 12, 2010 Looks awesome. Make a video. I want to hear that thing. Quote Link to comment Share on other sites More sharing options...
ColtGT4g63 Posted March 12, 2010 Author Share Posted March 12, 2010 Hey Thanks! It drives around pretty good, and the turbo sounds amazing! So far the trans hasn't taken a dump either. I plan to race the car next Friday night, so there will be some video' after that. Quote Link to comment Share on other sites More sharing options...
ColtGT4g63 Posted March 20, 2010 Author Share Posted March 20, 2010 6.96 @ 103mph. 1.7 60ft. Here's a little youtube video: http://www.youtube.com/user/ColtGT4g63?feature=mhw4 Quote Link to comment Share on other sites More sharing options...
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