Converter for 87 Iroc; 3000 too big?!?!
06-05-2004, 12:00 AM
#1
Converter for 87 Iroc; 3000 too big?!?! I have a buddy with a 87 Iroc that is wanting a higher stall in his car, he says everyone is telling him that 2500 is as big as he needs but I called BS. I am in the middle of installing a 3500 in my car which he thinks is a bit too big. I told him to not be a ***** and at least get a 3000. What do yall think about stalls for this application. Thanks in advance.
06-05-2004, 10:36 AM
#3
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Different engines with different characteristics need different converters.
As already mentioned, the LS1 which loves a converter is a different animal than the TPI. While 3500 isn't uncommon for an LS1, it would be way to high for a mainly street car TPI. I'm not sure if 3000 is too high, but I wouldn't go much higher.
I daily drive on a ~4200 in an LS1.
As already mentioned, the LS1 which loves a converter is a different animal than the TPI. While 3500 isn't uncommon for an LS1, it would be way to high for a mainly street car TPI. I'm not sure if 3000 is too high, but I wouldn't go much higher.
I daily drive on a ~4200 in an LS1.
06-05-2004, 10:42 AM
#4
What is done to the car? The old motor that was in my 86' - 350 tpi, small cam, all bolt ons, liked a 3000-3200 stall the best. I tried 3 different converters before settling on the 3000-3200. I ran 13.00's on BFG drags, full weight - no weight reduction, and pulled low 1.7 60' times. HTH
06-05-2004, 11:25 AM
#5
Power makes a diffence in stall to; what does a old IROC 350 put out? 250 hp? What does a typical LS1 put out? 350 hp? What stalls at 2500 in his car may stall at 3000+ in a LS1 (assuming you could swap them directly). Hence the drivability issue people warned him about. His converter would need to be looser to stall up to 3000; thus feeling looser for everyday driving.
Oh yeah, idealy you want to choose a stall close to peak tq. Where is that at in a stock TPI? I'm sure it's not much more than 3K if that. Of course a cam would probably move that up.
Oh yeah, idealy you want to choose a stall close to peak tq. Where is that at in a stock TPI? I'm sure it's not much more than 3K if that. Of course a cam would probably move that up.
06-05-2004, 11:34 AM
#6
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Like the other guys are saying.....What mods does he have?? Cam and gears would make a difference... For a huge difference you should tell him him to get an aftermarket intake....They'll rev to a little over 6k... With an intake you should be able to run a 3k stall....
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06-05-2004, 01:20 PM
#8
Originally Posted by BriancWS6
he has 4.10 gears, flowmaster, no cats, and K&N filters, thats about it. 2500 may be about right for his car, but I wouldn't go any lower in my pinion.
I'll assume it's not a TPI car then. Is it even a 350 in the car?
06-07-2004, 02:46 PM
#9
Originally Posted by 86 IROC
4.10's? I'll assume it's not a TPI car then. Is it even a 350 in the car?
I'll assume it's not a TPI car then. Is it even a 350 in the car? Whats wrong with having 4.10s in a TPI car? And yes it is a 350. I don't get what you meant with your above quote. Of course the gears aren't the stock ones, he put them in.
06-07-2004, 03:33 PM
#10
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If he has full torque up to 5500+ RPM then
a 3K stall is not too much. With a stock late
'80s cam & heads, though, he's likely not so
strong up top. But that can all be fixed too.
What really makes a higher stall livable, is
the lockup clutch and an overdrive tranny.
But a 4000RPM stall and a 5000RPM powerband
would be a little bit mismatched.
a 3K stall is not too much. With a stock late
'80s cam & heads, though, he's likely not so
strong up top. But that can all be fixed too.
What really makes a higher stall livable, is
the lockup clutch and an overdrive tranny.
But a 4000RPM stall and a 5000RPM powerband
would be a little bit mismatched.
06-07-2004, 04:32 PM
#12
Originally Posted by BriancWS6
Whats wrong with having 4.10s in a TPI car? And yes it is a 350. I don't get what you meant with your above quote. Of course the gears aren't the stock ones, he put them in.
