280z-racer Posted October 14, 2002 Share Posted October 14, 2002 OK IM RUNNING THE N42 MOTOR WITH A TURBO CONVERSION TO A T3/T4B, 440CC INJECTORS, LIGHTENED FLYWHEEL, LIGHTENED PULLY, 7.8:1 COMPREESION WITH THE ZX TURBO TRANNY AND A VOLVO INTERCOOLER, AND WILL SOON HAVE THE SDS. WITH ALL OF THESE DOES HIGH 11'S SOUND RIGHT?? Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted October 14, 2002 Share Posted October 14, 2002 You did not say what the car weighs (w/driver) but lets assume 2,850lbs w/driver. To go 11.95 @ 116 you will need about 350+RWHP. That assumes you can launch the car pretty good and cut 1.90 60' times AND you have that puppy fine-tuned. If you want to dip into the 11s and cannot cut those 60' times, you better have a ton of HP to try and make up on the top-end. IMO, thats pushing it for a non-turbo engine and (I will probably get slammed for saying this) that Volvo I/C is going to be a major detriment. To make that kind of HP you will need to be pushing around 18psi boost or more and you just cannot try to do it with an I/C designed for half that power output. The more boost you run to make that HP, the more restrictive the I/C gets, the more heat you are putting into that non-turbo engine. Do not take my post personal, but if you want to get into the 11s with a turbo, you cannot skimp on the I/C. I still have doubts about 350+RWHP with a non-turbo engine, but a top-quality I/C will sure help you get there safer. Work your way up the HP ladder slowly and once you start making good power you will also need to run octane to protect that engine as it cannot withstand much turbo detonation. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted October 14, 2002 Share Posted October 14, 2002 I agree with Scottie, especially about the Volvo intercooler. You want to run the TO4B up that high, a good intercooler is a must, as the B is less efficient than the TO4E, and you need more cooling to keep your intake charge cool. Quote Link to comment Share on other sites More sharing options...
TimZ Posted October 14, 2002 Share Posted October 14, 2002 Originally posted by Scottie-GNZ: I still have doubts about 350+RWHP with a non-turbo engine, but a top-quality I/C will sure help you get there safer. If you are talking about the limitations of the cast pistons, then I agree. However, my gut feeling is that the cast turbo pistons aren't really much better. Ring lands are still the weak link. As far as the block itself, I'm running an N42 block and head (ported head, and forged pistons, of course), and have had no block-related problems, FWIW. Ditto on the intercooler. Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted October 14, 2002 Share Posted October 14, 2002 Yup, the ring lands are the weak point. The one I have experience with made about 305RWHP (12.32 @ 114 in a 2600LB 240Z) and was punished with about 150+ passes, hard passes with an improperly setup JWT but a big Spearco helped it live longer. BTW, it had a stock P90 head. The switch to SDS and a stock F54 netted another 50hp (11.74 @ 119, 1.82 60') with a couple more psi of boost. Quote Link to comment Share on other sites More sharing options...
Guest Ian turbo240 Posted October 15, 2002 Share Posted October 15, 2002 I totally agree on the info in the above posts. I'm running a modified Starion intercooler and it's the weak link in my system. I have done a best of 12.66@113 with a 1.87 60'. I don't think you'll have problems with the block or head. Like Scottie and Tim stated, the pistons are the weak link. With delicate tuning and a good intercooler, I think 11's are possible with the rest of your setup. Ian P.S. I'm on the quest for 11's myself, and I'm gonna try it with the i/c I have. We'll see if it happens! Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted October 15, 2002 Share Posted October 15, 2002 No slamilization from Lj re the volvo intercooler. You are pushing the stock pistons in that engine, not to mention the rings are thicker, which means more friction. Be conservative with the SDS and you will be safer. BTW, why are you yelling? Quote Link to comment Share on other sites More sharing options...
SHANE Posted October 15, 2002 Share Posted October 15, 2002 oops Quote Link to comment Share on other sites More sharing options...
Ivan280zt Posted October 15, 2002 Share Posted October 15, 2002 shane f54 is the block that came in 79-83 zx (not 100% sure about years) and n42 would be your non-turbo block. i am about to be done with my setup (for right now) which is n42 block from 77z and p90 head from 82 turbo. i just hope that it hoolds until i can get turbo block. Quote Link to comment Share on other sites More sharing options...
yo2001 Posted October 15, 2002 Share Posted October 15, 2002 F54 came on late 280zx which is 81-83. F54 came with web supports which suppose to hold the boost better but I've not seen a hard proof of that except the fact all GT turbo cars used F54 blocks. Quote Link to comment Share on other sites More sharing options...
Ivan280zt Posted October 15, 2002 Share Posted October 15, 2002 dang i was close. one more question. will n42/p90 combo with 8-10 pounds of boost max, 3 inch down pipe and exhaust (mandreal beant sp) upgraded ignition, upgraded fuel pump, 240sx tbody and 75 shot of nos (wet kit). lets say that n42 is low milage too. so would this thing hold together and what hp range would it be in. Quote Link to comment Share on other sites More sharing options...
yo2001 Posted October 15, 2002 Share Posted October 15, 2002 Originally posted by Ivan280zt:dang i was close. one more question. will n42/p90 combo with 8-10 pounds of boost max, 3 inch down pipe and exhaust (mandreal beant sp) upgraded ignition, upgraded fuel pump, 240sx tbody and 75 shot of nos (wet kit). lets say that n42 is low milage too. so would this thing hold together and what hp range would it be in. I think that'll all depends. Different turbo will flow different amount of air with same amount of boost. I guess you got to put it together and tell us what kind of power you can put out You'll have more HP than me in mt N/A L6 Quote Link to comment Share on other sites More sharing options...
Ivan280zt Posted October 15, 2002 Share Posted October 15, 2002 ok i forgot to mention that its stock t3 but the only good news is that its gonna work on external wastegate but will see how all this works out if it blows then we are gonna know not to go that far Quote Link to comment Share on other sites More sharing options...
z ya Posted October 15, 2002 Share Posted October 15, 2002 Hey scottie , I ran some numbers though the rwhp calculator and it came up with 309rwhp for an 11.99. This is with a total weight of 2700 pounds. Are those things pretty accurate? Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted October 15, 2002 Share Posted October 15, 2002 You should be ok with the N42 block. Quote Link to comment Share on other sites More sharing options...
Z-Gad Posted October 15, 2002 Share Posted October 15, 2002 It'll handle 8-10 lbs of boost, but here in lies the problem... Once you start turning up the boost, you'll get greedy. When you get greedy, you'll want to "just turn it up a little more". Just know your limits. My .02 Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted October 15, 2002 Share Posted October 15, 2002 Z Ya, depends on which formula you use. Many of the ones on the Net do seperate HP calcs for ET and MPH. Since you said "for an 11.99" and did not mention MPH, I assume you did it just for ET. Remember that you can greatly improve your ET w/o adding a single HP by improving the 60' time. However, to greatly improve MPH (unless you have an extremely slow launch) you need to add HP. MPH is the true indicator of HP, so if you are calculating HP, you must factor in MPH. The formula I use factors in ET, MPH and weight w/driver. It might not be the best or most accurate, but it is the only one I use for consistency, especially when comparing HP numbers with other cars. Quote Link to comment Share on other sites More sharing options...
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