nish Posted June 18, 2007 Share Posted June 18, 2007 Just a little thread to announce the success and pseudo completion of my turbo conversion. I couldn't have done it without this site, thanks to those who run it. I have added a Holset HY35 to my stock N42 L28, gritty details can be seen here - NA to HY35 build diary I can highly recommend this turbo, it seems like a perfect match to the l28. BigPhil, you were definitely my inspiration, though I hope to keep mine together longer . I'm currently running 10PSI and that coupled with 8.3 CR and the HY35's efficiency leaves me well pleased. I have more tuning to do but the thing is impressive already. I can't wait to get some sort of benchmark. So far I only have the logs to go by. They show that stomping 3rd at 50mph turns into 90mph in 4 seconds. Here is a run down of what came together in this build: Stock N42 block/N47 head 2003 Holset HY35W 6"x18"x3" vertical intercooler 3" mandrel turbo back exhaust Megasquirt2 with EDIS ignition 450cc DSM injectors LC1 wideband I'll post some kill stories and such as things go on. Quote Link to comment Share on other sites More sharing options...
v8dats Posted June 18, 2007 Share Posted June 18, 2007 sweet combo congrats! Quote Link to comment Share on other sites More sharing options...
gearheadstik Posted June 18, 2007 Share Posted June 18, 2007 Dude, I love the heat shields.I have to do me one too...I bought a blanket but hate to cut a hole for the wastgate act.... I have almost the same setup..Are those the ford injectors? 38lbs? Mine are and that blue color. Mine did great till I had some 25psi detonation problems...haha...Good work Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted June 18, 2007 Share Posted June 18, 2007 WoW. Very nice and it really shows what the L28ET side of HybridZ is all about! Excellent writeup and photos. Got video? Quote Link to comment Share on other sites More sharing options...
TravRMK Posted June 18, 2007 Share Posted June 18, 2007 Very nice! Quote Link to comment Share on other sites More sharing options...
nish Posted June 18, 2007 Author Share Posted June 18, 2007 Thanks for the kind words. gearheadstik: those are 450cc DSM injectors, now I realize that wasn't mentioned anywhere else. cygnusx1: we're going to have to do some information sharing on MSII tuning I'm going to try and share any insights I learn along the way that go against traditional Z thought. Like how I can be pig rich (if I so choose) at 6k and 10 psi with the old stock fuel pump. I have a better one but haven't needed it yet. Quote Link to comment Share on other sites More sharing options...
big-phil Posted June 18, 2007 Share Posted June 18, 2007 Hey thanks! I'm sure you will love the hy35 as much as I do. I hope my new turbo motor will handle the abuse I'm going to give it. I'm this close to ordering some Ross forged pistons!!!. Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted June 19, 2007 Share Posted June 19, 2007 beautiful work my friend Quote Link to comment Share on other sites More sharing options...
nish Posted June 19, 2007 Author Share Posted June 19, 2007 Thanks Prox. Last night I felt pretty fast. There is a 4 lane road near me with a 6% grade that lasts for about 3/4 mile. I was pulling out at the bottom of the hill from a side road. Before I was even half way up the hill I was passing the last car that had come by at a 100 mph. The Z was going as fast up that hill as it does on a flat. Wee Quote Link to comment Share on other sites More sharing options...
wigenOut-S30 Posted June 19, 2007 Share Posted June 19, 2007 Do you holset guys find the turbo pretty laggy? first boost up and during shifts? at what RPM are you getting say 15psi of boost? I have started researching turbo's for when it is time for me to upgrade mine.. I really like how I get 15psi in my stock T3 by 25-2800rpms. and during shifts.. it boosts back up very quick.. Lets hear some Holset Data.. Quote Link to comment Share on other sites More sharing options...
nish Posted June 20, 2007 Author Share Posted June 20, 2007 Shhhh, don't talk like that, you'll get TonyD on you about boost threshold. I looked through my logs and couldn't find anywhere that I was trying to boost much below 3000. It takes ~1.5 sec to reach 12 psi from 3000 rpm vacuum based on current logs. From memory, I don't think I get more than 7psi too much below 3000. However, after about 3k it's like a runaway freight train right up to the rev limiter. I'm curious now for logs on the low end. I'll stand on 5th at 2500 rpm and see what I get. Quote Link to comment Share on other sites More sharing options...
GrayZee Posted June 20, 2007 Share Posted June 20, 2007 Shhhh, don't talk like that, you'll get TonyD on you about boost threshold. I looked through my logs and couldn't find anywhere that I was trying to boost much below 3000. It takes ~1.5 sec to reach 12 psi from 3000 rpm vacuum based on current logs. From memory, I don't think I get more than 7psi too much below 3000. However, after about 3k it's like a runaway freight train right up to the rev limiter. I'm curious now for logs on the low end. I'll stand on 5th at 2500 rpm and see what I get. I haven't gotten mine up and running yet (I'll have a very similar setup) but I am guessing that 10psi on that Holset will feel just as strong as 15psi on the stock T3.. would that be a fair statement? Quote Link to comment Share on other sites More sharing options...
Slow_Old_Car Posted June 20, 2007 Share Posted June 20, 2007 looks good, when you get bored, to gain some additional clearance for downpipe service, grind down the lower ridge from what i remember them calling a detroit diesel flange. that little 1" diameter gain is alot more useful than you'd think. Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted June 20, 2007 Share Posted June 20, 2007 10psi on the holset would be comparable to 13psi on the stock T3. that was my initial feeling... but then again im not at sea level.. so 15psi could be a close estimate Quote Link to comment Share on other sites More sharing options...
stagefumer11 Posted June 21, 2007 Share Posted June 21, 2007 10psi on the hy35 would not even be reaching the optimin effincy.would be around 50%..at 10psi. the stock t3 would be close or past to its limits of peak effincy at 13psi. Quote Link to comment Share on other sites More sharing options...
nish Posted June 26, 2007 Author Share Posted June 26, 2007 wigenOut-S30, Here is some data on boost threshold for my setup: Flooring it at 2500 rpm 2500 = 4psi 2600 = 5psi 2700 = 6psi 2800 = 7.5psi 2900 = 8psi 3000 = 9psi 3100 = 10psi The wastegate was set to 10 psi. I think you would have to wait until 3500 rpm to see 15 psi. These numbers would probably improve with an EBC. The response between shifts is very quick if you're shifting where the next gear leaves you above 3500 (and I would think you would be when driving hard). The power builds in a nice linear fashion and lets me hammer each gear after 1st without cooking the tires too bad. More is better, but this is nice currently since I'm operating inside of what the tires can handle (215/60/14). The Mega Log Viewer lets you put in your drive train ratios to display MPH. I logged a full effort blast through the gears and found the following: 0-60 mph = ~5 sec. (the tail end of second gear) 0-100 mph = ~ 12 sec. (the beginning of fourth) I'd like to see those times lower and I think there is a little more to squeeze out of this setup yet. Quote Link to comment Share on other sites More sharing options...
wigenOut-S30 Posted July 1, 2007 Share Posted July 1, 2007 wigenOut-S30,Here is some data on boost threshold for my setup: Flooring it at 2500 rpm 2500 = 4psi 2600 = 5psi 2700 = 6psi 2800 = 7.5psi 2900 = 8psi 3000 = 9psi 3100 = 10psi The wastegate was set to 10 psi. I think you would have to wait until 3500 rpm to see 15 psi. These numbers would probably improve with an EBC. The response between shifts is very quick if you're shifting where the next gear leaves you above 3500 (and I would think you would be when driving hard). The power builds in a nice linear fashion and lets me hammer each gear after 1st without cooking the tires too bad. More is better, but this is nice currently since I'm operating inside of what the tires can handle (215/60/14). The Mega Log Viewer lets you put in your drive train ratios to display MPH. I logged a full effort blast through the gears and found the following: 0-60 mph = ~5 sec. (the tail end of second gear) 0-100 mph = ~ 12 sec. (the beginning of fourth) I'd like to see those times lower and I think there is a little more to squeeze out of this setup yet. Thanks very much for the data.. thats very helpfull!!.. Quote Link to comment Share on other sites More sharing options...
SonOfZZZap Posted July 2, 2007 Share Posted July 2, 2007 thats good stuff man! turbos are so much fun! Quote Link to comment Share on other sites More sharing options...
WizardBlack Posted August 1, 2007 Share Posted August 1, 2007 Has anyone raised the boost beyond 10 psi on stock N42 bottom end and felt comfortable it'll hold together? (N42/N47 here with holset and MS2 on hand; collecting various other parts now...) Quote Link to comment Share on other sites More sharing options...
gearheadstik Posted August 2, 2007 Share Posted August 2, 2007 Yes, mine and big-phils were at 20psi before detonation took over...mine would have been fine I believe, but had problem with edis causing timing not to change....Which I had no clue of till afterwards. Quote Link to comment Share on other sites More sharing options...
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