what the hell should I look for??
05-20-2009, 03:58 PM
#1
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what the hell should I look for?? Again my car does a very low number at a decent boost level
08 Z06 427 warhawk with TTi kit (bigger turbos)
at 8PSI the car did 585RWHP on a dynoDynamics thats calibrated to read like a dynojet, yes the weather wasnt freezing outside and the runs were back to back, but still doesnt sound right
This is a number id expect from a 3xx CI engine with the same boost level, my previous supercharged 06 Z06 did 600+ RWHP at 5PSI of boost (STOCK ENGINE).
What should I look for, here are the flow numbers for the World Products 6bolt handported heads, can this be the culprit?
4.125" test bore
Intake
.100 .200 .300 .400 .500 .600 .650 .700 .750
72 144 215 280 327 351 358 364 373
50 102 151 189 223 246 252 256 259
Exhaust
Other than that I can only think of a VERY small exhaust leak beside the turbo, too small I took it forgranted and im not sure if it could cause an issue. Piping out of the turbo is 2.5inches and steps up to 3inches all the way to the rear, and its hooked to a true dual Corsa exhaust system.
Tests were done using 93octane fuel, running mid 11 AFR and 16-17 degrees of timing.
Engine was built by SpeedInc so no worries there, other than the fact that im worrying I did something that F-ed the engine lol. Engine also has a custom turbo cam that Jim designed.
Any help, suggestion would be greatly appreciated!!
08 Z06 427 warhawk with TTi kit (bigger turbos)
at 8PSI the car did 585RWHP on a dynoDynamics thats calibrated to read like a dynojet, yes the weather wasnt freezing outside and the runs were back to back, but still doesnt sound right
This is a number id expect from a 3xx CI engine with the same boost level, my previous supercharged 06 Z06 did 600+ RWHP at 5PSI of boost (STOCK ENGINE).
What should I look for, here are the flow numbers for the World Products 6bolt handported heads, can this be the culprit?
4.125" test bore
Intake
.100 .200 .300 .400 .500 .600 .650 .700 .750
72 144 215 280 327 351 358 364 373
50 102 151 189 223 246 252 256 259
Exhaust
Other than that I can only think of a VERY small exhaust leak beside the turbo, too small I took it forgranted and im not sure if it could cause an issue. Piping out of the turbo is 2.5inches and steps up to 3inches all the way to the rear, and its hooked to a true dual Corsa exhaust system.
Tests were done using 93octane fuel, running mid 11 AFR and 16-17 degrees of timing.
Engine was built by SpeedInc so no worries there, other than the fact that im worrying I did something that F-ed the engine lol. Engine also has a custom turbo cam that Jim designed.
Any help, suggestion would be greatly appreciated!!
05-20-2009, 05:05 PM
#4
I agree, but that is low IMO. I have friends with a similar setup making more off the same boost level. Can you turn up the boost a lb and see what results you get? You might have a MAJOR boost leak. I had 3 boost leaks that were not so obvious and when I fixed them I picked up almost 200rwhp at 13lbs. One leak was a bad BOV. The other was a loose intercooler clamp and the other was a leak at my meth connection.
05-20-2009, 06:56 PM
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What size is the turbo? Did I read it right that it comes out of the turbo 2.5" and then
3" all the way back? Sounds like a very restrictive exhaust for any kind of big hp.
3" all the way back? Sounds like a very restrictive exhaust for any kind of big hp.
05-20-2009, 11:34 PM
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those turbos were designed for the stock c.i.d right? You have almost 100 more cubes.
datalog it like jim said. You should let him figure it out, he's a turbo guru.
datalog it like jim said. You should let him figure it out, he's a turbo guru.
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05-21-2009, 12:24 AM
#8
Got me som I think he have bigger turbos.
Ayousef get the dyno graph please something wrong for sure and the wheather and fuel have nothing to do with I'm in Jeddah Same wheather as Dubai maybe hotter made number in my sig with 346ci small STS GT28s.
good luck man.
Ayousef get the dyno graph please something wrong for sure and the wheather and fuel have nothing to do with I'm in Jeddah Same wheather as Dubai maybe hotter made number in my sig with 346ci small STS GT28s.
good luck man.
05-21-2009, 10:35 AM
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"at 8PSI the car did 585RWHP on a dynoDynamics thats calibrated to read like a dynojet"
Not really possible...Inertia vs Load Cell....I've used both machines on turbo cars...DynoDynamics factory is only 4 hours away from me...DD is much nicer to use to tune a turbo car since you can go wide open and command it to hold the car at a given rpm (sounds wild...holding a turbo car wot at say 5000 rpm...but it's great ...especially to build a VE table without driving the car on the street) DynoJet is a cool tool also.
DD will always hurt your feelings if you're just looking for a big number though..
Find a DynoJet dyno and try it again before you start pulling parts off the car.
Not really possible...Inertia vs Load Cell....I've used both machines on turbo cars...DynoDynamics factory is only 4 hours away from me...DD is much nicer to use to tune a turbo car since you can go wide open and command it to hold the car at a given rpm (sounds wild...holding a turbo car wot at say 5000 rpm...but it's great ...especially to build a VE table without driving the car on the street) DynoJet is a cool tool also.
DD will always hurt your feelings if you're just looking for a big number though..
Find a DynoJet dyno and try it again before you start pulling parts off the car.
05-21-2009, 07:47 PM
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I agree, but that is low IMO. I have friends with a similar setup making more off the same boost level. Can you turn up the boost a lb and see what results you get? You might have a MAJOR boost leak. I had 3 boost leaks that were not so obvious and when I fixed them I picked up almost 200rwhp at 13lbs. One leak was a bad BOV. The other was a loose intercooler clamp and the other was a leak at my meth connection.
05-21-2009, 07:51 PM
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Jim, badluck as usual for me lol, the guy's printer is broken, seems ill have to buy him one 
However, the car made a LITTLE more, like 10 more rwhp after i switched the axle back from stock to a Corsa. I wanna add an x-pipe to make the car sound smoother, and change the down-pipe to a full 3 inch, as opposed to 2.5 >> 3. That might help a little bit.
My concern however is that no one seemed to mention anything about the head flow numbers, can the head be the bottle neck here?
Shall I take the risk of "PROPERLY" porting the turbo's exhaust flanges and housing attempting for a bigger a/r? should drop backpressure and shift power curve to the right if done properly, im not too concerned about low-end.
However, the car made a LITTLE more, like 10 more rwhp after i switched the axle back from stock to a Corsa. I wanna add an x-pipe to make the car sound smoother, and change the down-pipe to a full 3 inch, as opposed to 2.5 >> 3. That might help a little bit.
My concern however is that no one seemed to mention anything about the head flow numbers, can the head be the bottle neck here?
Shall I take the risk of "PROPERLY" porting the turbo's exhaust flanges and housing attempting for a bigger a/r? should drop backpressure and shift power curve to the right if done properly, im not too concerned about low-end.
05-21-2009, 08:20 PM
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"at 8PSI the car did 585RWHP on a dynoDynamics thats calibrated to read like a dynojet"
Not really possible...Inertia vs Load Cell....I've used both machines on turbo cars...DynoDynamics factory is only 4 hours away from me...DD is much nicer to use to tune a turbo car since you can go wide open and command it to hold the car at a given rpm (sounds wild...holding a turbo car wot at say 5000 rpm...but it's great ...especially to build a VE table without driving the car on the street) DynoJet is a cool tool also.
DD will always hurt your feelings if you're just looking for a big number though..
Find a DynoJet dyno and try it again before you start pulling parts off the car.
Not really possible...Inertia vs Load Cell....I've used both machines on turbo cars...DynoDynamics factory is only 4 hours away from me...DD is much nicer to use to tune a turbo car since you can go wide open and command it to hold the car at a given rpm (sounds wild...holding a turbo car wot at say 5000 rpm...but it's great ...especially to build a VE table without driving the car on the street) DynoJet is a cool tool also.
DD will always hurt your feelings if you're just looking for a big number though..
Find a DynoJet dyno and try it again before you start pulling parts off the car.
05-21-2009, 09:38 PM
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Those heads are fine. What's the Turbine ar now? Chasing parts is going to net very little HP gain on your combo. If the tune is good you're fine. Find a DynoJet.
Jim, badluck as usual for me lol, the guy's printer is broken, seems ill have to buy him one
However, the car made a LITTLE more, like 10 more rwhp after i switched the axle back from stock to a Corsa. I wanna add an x-pipe to make the car sound smoother, and change the down-pipe to a full 3 inch, as opposed to 2.5 >> 3. That might help a little bit.
My concern however is that no one seemed to mention anything about the head flow numbers, can the head be the bottle neck here?
Shall I take the risk of "PROPERLY" porting the turbo's exhaust flanges and housing attempting for a bigger a/r? should drop backpressure and shift power curve to the right if done properly, im not too concerned about low-end.
However, the car made a LITTLE more, like 10 more rwhp after i switched the axle back from stock to a Corsa. I wanna add an x-pipe to make the car sound smoother, and change the down-pipe to a full 3 inch, as opposed to 2.5 >> 3. That might help a little bit.
My concern however is that no one seemed to mention anything about the head flow numbers, can the head be the bottle neck here?
Shall I take the risk of "PROPERLY" porting the turbo's exhaust flanges and housing attempting for a bigger a/r? should drop backpressure and shift power curve to the right if done properly, im not too concerned about low-end.
05-22-2009, 02:06 AM
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Try another dyno 1st thing.
05-22-2009, 06:55 AM
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05-24-2009, 07:23 PM
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you still have not posted the exhaust manifold back press???
the t3 stg 3 turbine is the problem
i had a 355 sbc , and it made boost at 1200 rpm, same turbos as your 427 cube deal...
the 355 cube fell over at 5500 rpm too...
the t3 stg 3 turbine is the problem
i had a 355 sbc , and it made boost at 1200 rpm, same turbos as your 427 cube deal...
the 355 cube fell over at 5500 rpm too...