240Z Turbo Posted March 6, 2004 Share Posted March 6, 2004 22psi on pump gas Tim is going to buy a new GT4240R from me very soon. This car will make 600hp@wheels with the new turbo and cam. Quote Link to comment Share on other sites More sharing options...
Guest ON3GO Posted March 6, 2004 Share Posted March 6, 2004 dear god... on pump gas!!!! what cam is he gonna go with? mike Quote Link to comment Share on other sites More sharing options...
Drax240z Posted March 7, 2004 Share Posted March 7, 2004 Damn, and I thought TimZ's engine was all show! Great stuff TimZ! Talk about a sleeper! Quote Link to comment Share on other sites More sharing options...
jgkurz Posted March 7, 2004 Share Posted March 7, 2004 Congratulations Tim! I strive to come within a fraction of that kind of power.... It's interesting that every BIG HP turbo L28 that I've seen make all their power under 6000 RPM's. I'm guessing the reason is in the design of the cylinder head. I have a fairly large ISKY turbo cam and my peak power came in at 5250 RPM last time I was on the dyno. Quote Link to comment Share on other sites More sharing options...
speeder Posted March 7, 2004 Share Posted March 7, 2004 Yup, definitely room for improvement..... Quote Link to comment Share on other sites More sharing options...
TimZ Posted March 7, 2004 Share Posted March 7, 2004 Thanks, guys... The weather cleared up here this last week, and the forecast was for dry weather today, so I scrambled for some dyno trime, and then to get my car put back together I really wanted to get a baseline with the new setup, so I could tell what additional changes (turbo, cam...) helped and how much. Anyway, the cam that I am using is still the Isky L475 grind - the mildest turbo cam that Isky has. Flow bench tests showed that I could keep gaining flow out to about .530 lift, so I should be able to get pretty good results with a new cam. Haven't decided on a grind just yet. Quote Link to comment Share on other sites More sharing options...
Guest Cronic Posted March 7, 2004 Share Posted March 7, 2004 Anyone else realize the incredibly lean condition? 14:1? you're going to be damaging shit. Quote Link to comment Share on other sites More sharing options...
v8dats Posted March 7, 2004 Share Posted March 7, 2004 man that is awesome! do u have to do any special work to the head other than springs to make that cam work? Quote Link to comment Share on other sites More sharing options...
TimZ Posted March 7, 2004 Share Posted March 7, 2004 Anyone else realize the incredibly lean condition? 14:1? you're going to be damaging dodo. That particular run was leaner than I would normally like, but the 14:1 was just a transient lean spot as boost was starting to build. When the boost hit, went back down into the 13's and then into the 12's. On subsequent runs, I fattened the mixture up until it was right at 12:1 through the boost range. Cost me a few hp though - the last run was only 462, but I did gain about 0.5 lb-ft... EGTs were in check (~1400degF) and it wasn't detonating, so I didn't feel too bad showing that run. As I mentioned I was just trying to establish a baseline today. Here was the last run of the day: Quote Link to comment Share on other sites More sharing options...
slownrusty Posted March 7, 2004 Share Posted March 7, 2004 Simply incredible! Congrats...I tip my hat to you... Yasin Quote Link to comment Share on other sites More sharing options...
Ben Posted March 7, 2004 Share Posted March 7, 2004 Where is your EGT being taken from? 1400F is a nice after-turbo temp considering the BMEP that thing would have.... Quote Link to comment Share on other sites More sharing options...
Clifton Posted March 7, 2004 Share Posted March 7, 2004 What turbo. Compressor, turbine trim, and a/r? Clifton Quote Link to comment Share on other sites More sharing options...
TimZ Posted March 7, 2004 Share Posted March 7, 2004 What turbo. Compressor' date=' turbine trim, and a/r? Clifton[/quote'] It's a Turbonetics T64 - the turbine side is o-trim with a .84 ar split tangential housing. The EGT is at the turbine inlet. The temps may have gone a bit higher than 1400, but I'm certain they never went over 1500F. They were starting out at about 1300 at the onset at boost and were slowly creeping up as the run went on, and seemed to stabilize at around 1400, maybe a little over. Kind of hard to watch everything while you are doing the pull. : On the head - I had it redone and flow benched this last time around. When the new factory Nissan valve guides arrived, they were steel - apparently the brass ones aren't avalable. So I had new brass guides made - my head guy said that I could go as high as .540 lift with this setup. Quote Link to comment Share on other sites More sharing options...
Ben Posted March 8, 2004 Share Posted March 8, 2004 In that case then, contrary to the A/F on the dyno graph. it certainly isn't showing up as a dangerously lean mix with before-turbo temps of 1400F. I get around 1250F after turbo on my 8psi powerplant at 12.5:1 AFR.... FWIW - I was able to get brass guides from Malvern Racing. Lovely work, something to aim for! Quote Link to comment Share on other sites More sharing options...
mobythevan Posted March 8, 2004 Share Posted March 8, 2004 oh my.... Quote Link to comment Share on other sites More sharing options...
scottyMIz Posted March 8, 2004 Share Posted March 8, 2004 congrats tim knew that thing was making some real power Hey i'll definately take that cam off your hands when your done with it Quote Link to comment Share on other sites More sharing options...
Z-Gad Posted March 8, 2004 Share Posted March 8, 2004 Thanks for posting the #'s and the graph. Very impressive Quote Link to comment Share on other sites More sharing options...
Afshin Posted March 8, 2004 Share Posted March 8, 2004 Gorgeous graph. You should make a custom frame for it 8) Unfortunately for me, it seems like the Yoga master will kick the sumo wrestler's @ss Quote Link to comment Share on other sites More sharing options...
fl327 Posted March 9, 2004 Share Posted March 9, 2004 Very nice, inspiring like. Quote Link to comment Share on other sites More sharing options...
Sparks280zt Posted April 15, 2018 Share Posted April 15, 2018 Ballpark cost into this build? Quote Link to comment Share on other sites More sharing options...
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