80LS1T Posted February 10, 2003 Share Posted February 10, 2003 Well most guys are saying that the 11:1 compression that I want to run is too high for what I have as a set up!? So what should I run? Here's what I have for a set up... *93 LT1 .030 over 355cid *LT4 "HOTCAM" kit(and yes I know that the hotcam is not a big cam!) *58mm Holley TB *Updated Optispark to 95+ vented style *58cc Stock Heads that are being Ported & Polish by Jeff Ondo of Ondo Performance(http://www.ondoperformance.com/) and the intake runners are also being enlarged. I don't have any flow numbers though. *Bosch 36lbs injectors *Computer Tuning will be done by Street & Performance unless anyone can recommend someone better! I am running a Speed Density system not MAF I am looking to get about 400HP at the crank with this set up. Can it be done? What should I run for compression to get me to 400HP? Also can someone run this on Desktop Dyno for me? Thanks, Guy Quote Link to comment Share on other sites More sharing options...
zgeezer Posted February 10, 2003 Share Posted February 10, 2003 Ok, my brother (the Ford guy) has run desktop dyno for me on the following LT1 configuation. '96 350, 95 Camaro aluminum heads, 11:1 compression (Aluminum heads with thin head gasket (an Impala/Caprice part for iron heads), and the ZZ3 cam from early Chevy crate engine. A mild cam. He predicts 365 hp @ 4500 rpm. Stock static CR for F body cars is 10.5 for LT1. LT4 advertised 10.8. I don't think you'll have any problems running 11:00 with the "hot" cam. I think 400 hp will be more a function of cam than compression in your configuation. gw Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted February 10, 2003 Share Posted February 10, 2003 if you do truely have a static 11"1 cpr your DYNAMIC cpr WITH THE HOT CAM will be about 8.5:1 which may cause problems if you get less than 93 octane gas on hot days even with aluminum heads.(UNLESS YOU INSTALL IT RETARDED ABOUT 6 DEGREES)and even then its close to the limit, swapping to a CRANE #109831 installed 4 degrees retarded will get you down around 8:1 where youll run just fine on 92 octane PLUS my computer makes its wild guess at 394hp/450 tq peak with the hot cam and 415hp/470 tq peak with the crane cam but the crane cam requires a 2500 stall converter or a manual transmission http://dab7.cranecams.com/SpecCard/DisplayCatalogCard.asp?PN=109831&B1=Display+Card same cam but for early block http://dab7.cranecams.com/SpecCard/DisplayCatalogCard.asp?PN=119831&B1=Display+Card but as always CALL AND TALK TO CRANE BEFORE PURCHASING THE CAM and ask LOTS OF QUESTIONS Quote Link to comment Share on other sites More sharing options...
80LS1T Posted February 10, 2003 Author Share Posted February 10, 2003 Well should I run something like 10.8:1 then or even 10.5:1? Also if I just bought the crane cam would it be too big for the rest of the LT4 Cam kit? Another words would I have springs binding with the LT4 Springs and the Crane Cam? Thanks, Guy Quote Link to comment Share on other sites More sharing options...
Mudge Posted February 10, 2003 Share Posted February 10, 2003 Its not too high, but there is no reason at all with such a whimpy cam. I ran 11.4:1 on 91 MTBE craptane. The LT4 springs are marginal at .525", they were for the LT4 originally NOT the Hotcam, some people find that they are too close to coil bind and dont use them even with the "Hotcam." Quote Link to comment Share on other sites More sharing options...
Tim240z Posted February 10, 2003 Share Posted February 10, 2003 Will the PCM not compensate and just retard the ignition timing if it 'senses' detonation? Tim Quote Link to comment Share on other sites More sharing options...
Mudge Posted February 10, 2003 Share Posted February 10, 2003 Originally posted by zgeezer:He predicts 365 hp @ 4500 rpm I have Desktop Dyno 2k and Engine Analyzer as well, however even the stock cam peaks at 5200, not a measly 4500 RPM, it is not a flat tappet setup which sounds like what your brother set it up as. Quote Link to comment Share on other sites More sharing options...
Mudge Posted February 10, 2003 Share Posted February 10, 2003 The PCM can compensate yes, but retard is BAD. Retard takes time to go away, a fairly long time, and once it starts it just gets worse, in other words a retard situation resulting in 2º too much timing could result in 8º or so of retard, and last several long seconds to go away. If someone needs programming help I can try to lend a hand, something as mild as the Hotcam should be piss simple to setup. BTW, with a Hotcam if the heads are decent, you should hit 400 crank HP or better, I've seen as much as 365/370 RWHP with a decent set of LT1 heads and Hotcam. This is with about a 13% drivetrain loss with a T56. Quote Link to comment Share on other sites More sharing options...
Tim240z Posted February 10, 2003 Share Posted February 10, 2003 Mudge, Then I suppose just editting the timing curve manually by a degree or so will preclude the knock response. If I remember correctly you are also using TunerCat? Tim Quote Link to comment Share on other sites More sharing options...
Mudge Posted February 10, 2003 Share Posted February 10, 2003 Yessir, I use Tunercat. I know some guys in the southern area that might be available as well. What I started out with was street tuning, basically you try to smooth out the low RPM tables so that you dont have too much timing changes from cell to cell (there is interpolation however), especially since a rough idle will bounce it around the MAP range. Low end tuning is definately the toughest, although I ran a plenty larger cam. Low end is definately an area of fine tuning, not sweeping massive changes. So fine tuning cell by cell is not unheard of, although generally I'd be playing with 2 or 3 cells at a time. If I could have had better gas to work with, I would have one mother f'er of a stump puller, I was making AWESOME off idle torque but was getting pinging and could not get rid of it while retaining my TQ, I ended up making 385 peak RWTQ, I think 325 @ 2500 RPM but I can't connect to my webspace to look at my dyno sheet... Do you have any Hotcam base files to look at? AF is easy, timing is where the work and fine tuning comes into play... Quote Link to comment Share on other sites More sharing options...
Mudge Posted February 10, 2003 Share Posted February 10, 2003 BTW, some stations claim to have 92 octane (BP here does), and some (76) dont use MTBE. Quote Link to comment Share on other sites More sharing options...
Tim240z Posted February 10, 2003 Share Posted February 10, 2003 Originally posted by Mudge:BTW, some stations claim to have 92 octane (BP here does), and some (76) dont use MTBE. Yeah, apparently 76 has made the switch to ethanol already!Tim Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted February 11, 2003 Share Posted February 11, 2003 I dont think you'll have too much trouble. If you want more power go with standard bolt ons or a larger exhaust and headers 4" single with spintech muffler are good combo with chevy smallblocks. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted February 11, 2003 Share Posted February 11, 2003 I ran the HOT CAM with the LT4 vavletrain 1.6 rockers on some nice vortecs. I put 340hp 424tq. Rear Wheel which is like unheard of for this combo. I love the torque curve this was the best street motor I've ever experianced, for a small block. It pushed a 7.7 at 94mph 1/8 with a ugly 2.1X 60 ft. didn't make it to the track on tires . I shifted at 5800, never had a valvetrain problem in over 2 years with that motor. Honestly I never took the valvecover off the engine after assembly, till I sold it. Quote Link to comment Share on other sites More sharing options...
Mudge Posted February 11, 2003 Share Posted February 11, 2003 That is monsterous torque, L98 like, but us LT1 guys will never see those kind of numbers without a mean solid roller or a blower. There was an L98 stroker, 373 RWHP and 490 RWTQ, NA 383! No HP but gobs of TQ. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.