got some dyno numbers on T67/403 mis-matched combo
08-12-2007, 10:39 PM
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got some dyno numbers on T67/403 mis-matched combo and the little turbo is hating me
it made 595 RWHP right around 4800 to 5000 RPM and 660 RWTQ at 3500 RPM but the boost was all over the place then it fell off pretty quick which, I think, means I am all out of turbo, but I knew that going in and was planing of a upgrade
that was at a really fat 10.0 to 1 AFR so it should have just a little more in it
it was making 12 PSI at peak TQ but had fell of to around 8.5 or so by 5000 RPM
I guess the T67 GTQ is just way to small for a 403 CID engine
so I guess it just needs a friend
I was spinning the engine up to around 6000 RPM and between 5000 and 6000 it would loose around 100 RWHP at the same boost level
now I just need 2 T67 turbos and a better fuel system and I should be able to put down 900+ to the tires with my six speed, if I dont switch over to the dark side and put an auto in it
it made 595 RWHP right around 4800 to 5000 RPM and 660 RWTQ at 3500 RPM but the boost was all over the place then it fell off pretty quick which, I think, means I am all out of turbo, but I knew that going in and was planing of a upgrade
that was at a really fat 10.0 to 1 AFR so it should have just a little more in it
it was making 12 PSI at peak TQ but had fell of to around 8.5 or so by 5000 RPM
I guess the T67 GTQ is just way to small for a 403 CID engine
so I guess it just needs a friend
I was spinning the engine up to around 6000 RPM and between 5000 and 6000 it would loose around 100 RWHP at the same boost level
now I just need 2 T67 turbos and a better fuel system and I should be able to put down 900+ to the tires with my six speed, if I dont switch over to the dark side and put an auto in it
Last edited by Darren P; 08-12-2007 at 10:51 PM. Reason: my spelling sucks
08-12-2007, 11:03 PM
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Originally Posted by RealQuick
Well, the results are to be expected, but its good you made the post. If you can attach the graph of the dyno run it would be cool.
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(Or twin 67s) 
08-13-2007, 03:34 PM
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Originally Posted by Zombie
Who picked the turbo for the setup? Q trim on a 403 is just asking for trouble. Backpressure city. Twins on the other hand, that could work nice.
then I lost compression then I got carried away with the engine
but I did it with plans to do a twin t66/ 60/ or 70 setup
just have not started the twin setup yet
it should be on the car in a couple months or so
