Blowing through converter?
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Blowing through converter? We are in Louisiana this weekend at the last Super Chevy event of the year. Our C5 is a cam only with bolt-ons and makes 429 to the wheels. We also have a Nitrous Outlet kit with a stand alone , NANO kit and all the bells and whistles. It will make 600 on 150 jets.
Tonight we ran 11.33 @ 119 with a 1.53 60' NA. When I try to spray it, even with the progressive controller set to come on 2 seconds after I leave, it still bangs the Rev limiter in each gear all the way through the run. Is our Yank SS4000 too loose for the nitrous ?
Scott
Tonight we ran 11.33 @ 119 with a 1.53 60' NA. When I try to spray it, even with the progressive controller set to come on 2 seconds after I leave, it still bangs the Rev limiter in each gear all the way through the run. Is our Yank SS4000 too loose for the nitrous ?
Scott
Its possible your bolwing through the converter some but probably not enought to worry about once tune is adjusted. My guess is the nitrous is loosening up the converter 2-300rpm and is allowing the motor to hit the rev limiter before the shift mph is met. When I set up my trans tune I usuall set my shift mph 3mph slower than the equivalent mph for my shift rpm. I then set my rev limiter 200 rpm above the shift rpm. Doing it this way allows you to notice a slipping trans as soon as it starts going instead of completely frying the trans right away.
If you have the capabilities I'd drop the the shift mph and rpm and log a couple runs to get the tune right then you'll be able to see if the converter is holding or not. If you have a log and want to compare efficiency let me know and I can post up mine with the SS4000.
If you have the capabilities I'd drop the the shift mph and rpm and log a couple runs to get the tune right then you'll be able to see if the converter is holding or not. If you have a log and want to compare efficiency let me know and I can post up mine with the SS4000.
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Its possible your bolwing through the converter some but probably not enought to worry about once tune is adjusted. My guess is the nitrous is loosening up the converter 2-300rpm and is allowing the motor to hit the rev limiter before the shift mph is met. When I set up my trans tune I usuall set my shift mph 3mph slower than the equivalent mph for my shift rpm. I then set my rev limiter 200 rpm above the shift rpm. Doing it this way allows you to notice a slipping trans as soon as it starts going instead of completely frying the trans right away.
If you have the capabilities I'd drop the the shift mph and rpm and log a couple runs to get the tune right then you'll be able to see if the converter is holding or not. If you have a log and want to compare efficiency let me know and I can post up mine with the SS4000.
If you have the capabilities I'd drop the the shift mph and rpm and log a couple runs to get the tune right then you'll be able to see if the converter is holding or not. If you have a log and want to compare efficiency let me know and I can post up mine with the SS4000.
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Thanks.
Scott
Sprayed well over a 200 shot with my SS4000 w/o an issue, but my tranny has been rebuilt.
Like Tug686 stated, get your tune adjusted by moving the rev limiter up 3-400+ rpms past your shift points.
Is your tranny stock?
Like Tug686 stated, get your tune adjusted by moving the rev limiter up 3-400+ rpms past your shift points.
Is your tranny stock?
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IIRC the shift points are set around 6200 and the rev limiter is 6900 so it's already about 700 rpm above the shift points.
I spoke with Dave at Yank yesterday and he said for this converter to work with what I'm doing the car would have to pull to 7400+ rpms. He suggested having the stall redone to 3400 and felt that would wake the car up on nitrous.
Scott
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Give Greg @ FTI shout. They have a 3800 nitrous converter that works good NA and is great on Nitrous. I think the 3400 will leave quite a bit on the table NA if you are concerned with that.
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This sounds weird but we actually want to do that. Before the cam when we were bolt-on only the car ran about 11.60. I've been racing for 30+ years but my wife is new to drag racing and likes to drive the car too. I don't want her going low-11s @ 119 and prefer to slow it back down to upper 11s @ 115 and will feel much more comfortable.
Scott
Sounds like your tranny is slipping and can't handle that size shot.
Dave @ yank is right regarding shifting higher to benefit for that size stall on the shot, but I wouldn't do that until you get a beefier tranny. I'm shifting at around 7K.
Dave @ yank is right regarding shifting higher to benefit for that size stall on the shot, but I wouldn't do that until you get a beefier tranny. I'm shifting at around 7K.
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Scott
