Matching converter to bigger cam?
Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 387
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From: Casselberry, FL.
Matching converter to bigger cam? I was curious what the opinion was of the experts at LS1tech about what converter would be the best match for the Thunder 224 cam @ 114 ? I am currently running a vig3200 and I am experiencing some shudder around 40-45 mph. If this shudder is something I am going to have to live with I may want to go with something bigger.
Thanks guys. <img border="0" alt="[hail]" title="" src="graemlins/gr_hail.gif" />
Jim
Thanks guys. <img border="0" alt="[hail]" title="" src="graemlins/gr_hail.gif" />
Jim
Re: Matching converter to bigger cam? I would think your converter is perfect for that particular cam. I have a very similar combination. TR224 112LSA cam, Yank ST3500 converter, 3.73 gears. No shuddering at all, in fact, I've lowered my lock-up to occur at 35 mph in OD (and I may go even lower). It pulls like a freight train at anything above 1200 rpms. I'm not sure if it's your converter.
When you say shudder, do you mean it's kinda like clutch chatter or is the car bucking (good lockup, but car jerks around?). Clutch chatter is a converter problem. Bucking could be a rear end with too much slop in it or it could be a cam installed in a valve timing position the motor doesn't like.
When you say shudder, do you mean it's kinda like clutch chatter or is the car bucking (good lockup, but car jerks around?). Clutch chatter is a converter problem. Bucking could be a rear end with too much slop in it or it could be a cam installed in a valve timing position the motor doesn't like.
__________________
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.
Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 387
Likes: 0
From: Casselberry, FL.
Re: Matching converter to bigger cam? Patrick. Your second option seems to be what I am experiencing. I have had the cam in since November and it worked perfect with my SY3500. In January I installed a TP4400 and it started the shuddering/bucking problem. I then installed a vig3200 and it didn't change anything. The converter locks up fine but then I get the bucking effect. All the mechanics I have talked to say it is cam surge at to low of an rpm. My problem with this answer is that it does it in third gear with the rpm up around 1900-2100. I can't believe that is not a high enough rpm.
Jim
Jim
Re: Matching converter to bigger cam? My old '98 Camaro did this after it was wrecked. The body shop put in a used rear end (out of a '99 F-body) to replace the trashed rear end. There was tons of slop in the ring and pinion (pretty common with a lot of the '99 Torsen rear ends) and it would rattle like crazy. I think your problem may have always been there, but the lockup clutch on the Super Yank 3500 is a viscous clutch that cushions the locking and unlocking (like they use in a Northstar Cadillac). The lock-up clutch in the YPT4400 and Vig3200 is a direct clutch and there would be no cushioning effect to soften any driveline clashing (from things like a loose rear end).
This could be totally ring and pinion related like it was in my old Camaro. I hated that replacement rear end.
This could be totally ring and pinion related like it was in my old Camaro. I hated that replacement rear end.
__________________
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.
Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 387
Likes: 0
From: Casselberry, FL.
Re: Matching converter to bigger cam? Thanks for your help Patrick.
I had the rear checked when it was at the dealer using the chassis ears and the mechanic who races corvettes said that the rear end lookes fine. I was wondering why it would only occur around a certain mph if it is rear end related?
Jim
I had the rear checked when it was at the dealer using the chassis ears and the mechanic who races corvettes said that the rear end lookes fine. I was wondering why it would only occur around a certain mph if it is rear end related?
Jim
