Shift extension question
Shift extension question On my 98 Z28 with an YPT4000 and 3.23 gear my 1-2 and 2-3 shifts take place at 6200rpm and the rpm drops to 5500 after each shift. If I lower the shift points will that reduce the shift extension?
The reason I want to do this is because the car pulls like mad between 5500 and 5900 with a real sweet spot at 5700. I can feel it drop off quickly when it hits 5900. I currently have the shift points set at -1mph on the 1-2 shift and -4mph on the 2-3 shift with the rev limiter set at 6400. I have them set this low because I was hitting the rev limiter.
Thanks
John
The reason I want to do this is because the car pulls like mad between 5500 and 5900 with a real sweet spot at 5700. I can feel it drop off quickly when it hits 5900. I currently have the shift points set at -1mph on the 1-2 shift and -4mph on the 2-3 shift with the rev limiter set at 6400. I have them set this low because I was hitting the rev limiter.
Thanks
John
Re: Shift extension question Thanks for the reply. I thought that would be the answer. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
But just to be sure I will lower the shift points and see how much it changes. If I can lower the extensions by a few hundred RPM then I will be happy. And maybe a 1/10 faster! <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />
Thanks
John
But just to be sure I will lower the shift points and see how much it changes. If I can lower the extensions by a few hundred RPM then I will be happy. And maybe a 1/10 faster! <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />
Thanks
John
Re: Shift extension question You want a high shift extension; not only are you making near peak HP, the converter is multiplying torque.
I'm not saying that lowering your shift points won't work; but higher shift points let the gears multiply torque. The 1-2 shift has a big gear drop. If you have headers and a good exhaust, I'd experiment with a 6200 shift point too, even if it doesn't pass your SOTP test.
I'm not saying that lowering your shift points won't work; but higher shift points let the gears multiply torque. The 1-2 shift has a big gear drop. If you have headers and a good exhaust, I'd experiment with a 6200 shift point too, even if it doesn't pass your SOTP test.
Re: Shift extension question Shift extension is more dictated by engine torque than rpm. Lowering shift points will not lower your shift extension very much unfortunately.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
