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| General Turbo Buick Tech Technical discussions |
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Mike,
I know someone up in Flint that was shifting at 6800 rpm. He was running a 224 or 230 cam. Brian
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87 Turbo T, Silver with maroon interior, and 35K miles. PTE 61-52E, CAS V-4, 42lb inj, 65mm t-b and HEMCO upper, TINMAN cold air kit. Powered by ALKY control. 11.77 @ 114, 23 psi (resting on jackstands )87 Turbo T, Blue on blue, ex DEA car, 9.5 PTC N/L 2800 @ 0 boost conv, Champion ported heads and intake, stock cam and bottom end w/ 117K, ESP front mount, PT62-65DBB, 55 inj, Hemco, 3.42 gears with a locker, 10.82 @ 125 @25 psi 1.61 60ft on Hoosier drag radials. Need a Hi Perf trans? Email me... hipsibri@cs.com |
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Lots of variables, but 5400-5800 range sounds "safe"
HTH
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Well, I know this is an old thread but, there may be an “updated point of view”
. So, as of March 2009, what is the consensus on RPM limit with a stock bottom end?
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HA Specific Chip With Wideband Tracking By Turbo Tweak -"Very Simple, Yet VERY Effective" |
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i dont think you can really compare whats safe based just on rpm , hp has some bearing on whether it will live at high rpm
at a little over 600rwhp ive been shifting and trapping little over 6,000 (129+ on 28" slick) , has been to 6350 a few times on shifts , can tell you i dont feel comfortable running over 6k and with with my hyd flat tappet cam (212/208) im off the power band at 5800 or so , a tighter converter would help a lot more than spinning it up
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paul - MAGNA NJ rep the 86GN bests 1.41 6.57 105 10.41 129.8 bone stock shortblock ,71GTQ, msbc-1, V2, ported irons ,tt6.0wb 75# ... now extremeauto th400 w/brake , vig converter, FAST, 83s =cracked #3 piston the 87GN , 11.31 ,120.9 TE44, duttneck, weber CNC raceport irons w 1.65 T+D, msbc-1, tial38, hi-pro,protorque, TT 55# through aerochambers big thanks to julio at alkycontrol.com eric at turbotweak.com A little fun with the GNs at Atco video |
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So pauly just to be clear, you say 6k is where you feel comfortable but not more.
I ask because I'm putting in a 218 218 roller now while we're freshing up the motor.
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Collin Hundley 87 GN - 10.76@126 1.60 60' 86 T-type Primered with bench seat OH YEAH!!!!! 11.70@116 with a sucky 60' But the car has gone 7.03@96 in the 1/8th with a 1.47 60' - Parted out |
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I pulled 5750 in 3rd at the drag strip and wasnt comfortable at all.
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www.ottosperformance.com |
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colin, stock bottom i like to go no bigger than 212/212
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paul - MAGNA NJ rep the 86GN bests 1.41 6.57 105 10.41 129.8 bone stock shortblock ,71GTQ, msbc-1, V2, ported irons ,tt6.0wb 75# ... now extremeauto th400 w/brake , vig converter, FAST, 83s =cracked #3 piston the 87GN , 11.31 ,120.9 TE44, duttneck, weber CNC raceport irons w 1.65 T+D, msbc-1, tial38, hi-pro,protorque, TT 55# through aerochambers big thanks to julio at alkycontrol.com eric at turbotweak.com A little fun with the GNs at Atco video |
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I think weight and weather it is NA or Huffed is a big factor as well, I would push a stocker bottom past 5750 in a stock bodied car...... or really anything over 3300lbs, with or without boost.
but i have pushed a stocker NA 4.1 rotating assembly to 6500 in a 2500lb body. Kinda scary sounding, but it has held multiple times.... **** - I'll do it on the way home from work tonight!! might beable to grab 7 if i can get somebody to hold the camera. A.j.
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http://www.youtube.com/watch?v=ykgDNjeTa0gAlmost Complete: 79 Buick LUV, 6-71 Supercharged 274ci Stage 2. Just Starting: 79 Buick LUV, Draw Thru Turbocharged 231ci Stage 1. |
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have to keep in mind that if you're running on chip... most chips have rev limiters that cutoff fuel.
highest they can set them is 6350 ... might be set lower!... you'll have to check by either asking you chip guy or do a breakdown of the chip on a pocket programmer straight gas or race gas wont have a problem with the limiter , spraying denatured and water mix is not too bad because its not a fuel but meth is and if injectors are cutoff at that rpm under boost meth still sprays and will be lean and go pop and you'll be looking for a head gasket . make sure your chip has the limiter removed ,
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paul - MAGNA NJ rep the 86GN bests 1.41 6.57 105 10.41 129.8 bone stock shortblock ,71GTQ, msbc-1, V2, ported irons ,tt6.0wb 75# ... now extremeauto th400 w/brake , vig converter, FAST, 83s =cracked #3 piston the 87GN , 11.31 ,120.9 TE44, duttneck, weber CNC raceport irons w 1.65 T+D, msbc-1, tial38, hi-pro,protorque, TT 55# through aerochambers big thanks to julio at alkycontrol.com eric at turbotweak.com A little fun with the GNs at Atco video Last edited by pacecarta; March 10th, 2009 at 11:01 AM. |
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