Max Power Standard Cams dyno problems help needed
Quick rundown on my setup in my 2004 msm
Full built motor forged wiescos aftermarket rods arp bolts etc Ported head with upgrade fm valve springs. VVT flat top manifold with larger throttle body < match ported to head Log style manifold < match ported to head 3071r internal gated full 3 inch exhaust no cat 1 muffler 4 inch intake of turbo with large k&n filter Usual size inter cooler piping and decent size inter cooler up front. 1000cc injectors and upgraded full fuel system LS3 style coils Pump 93 fuel Seems like we hit a bottle neck on dyno car does not want to make anymore power no matter what boost or timing we put into it 21 psi 22deg of timing 24psi 18deg of timing car gains like 3-4hp at the back wheels ? Besides the standard cams i cant think of what else could be causing it any idea ? Car pulls strong to 7200rpm red line |
What intercooler piping size are you working with?
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What power level are you at now?
What brand of turbo? 21-24 psi on a 3071r should be a shitload of power. I'm using one of these (a real Garret) on a 91 MR2 turbo. At that boost level I'll be on E85 and making 450+ at rear wheels. It would waste my completely forged bottom end on pump gas. At 15 psi I'll be on 93 making 325 at rear wheels, which will be more than enough for street use. Way more than a Mazda transmission can hold (even a six speed). What is your turbine inlet pressure? (in exhaust manifold before the turbo) A log style manifold may be far above its total flow capacity with that turbo at those boost pressures. Size of everything in the system matters at these flow levels. |
psyber_optix i will have to check size but outlet of turbo is same size as piping maybe 2 inch or 2 1/4 inch
Other side of intercooler to throttle body is 2.5 inches i think Technicalninja Genuine garrett gt3071r But the t2 flange rear one but with the largest .86 rear housing. Not using the smaller .64 |
Show us a Dyno chart and a log.
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Max power and at what afr?
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Not a usa dyno so already lower didnt get copy of dyno sheet i was there whole time car was on dyno
was around 270 whp on 21 psi 24 psi was like 274whp AFR was around 11.8 on boost on 21psi Around 11.8 on 24 psi Dyno area was around 65f room temperature so not hot and ecu was not hitting any kind of iat over temp etc timing reductions etc |
Not a usa dyno so already lower |
Originally Posted by 18psi
(Post 1571791)
:laugh:
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hehehehehe
better watch it il get banned soon :) |
Originally Posted by Turbo2004
(Post 1571783)
Not a usa dyno so already lower didnt get copy of dyno sheet i was there whole time car was on dyno
was around 270 whp on 21 psi 24 psi was like 274whp AFR was around 11.8 on boost on 21psi Around 11.8 on 24 psi Dyno area was around 65f room temperature so not hot and ecu was not hitting any kind of iat over temp etc timing reductions etc Have you checked the timing gears to make sure they are timed correctly? It's hard to explain where that power is going, is your clutch slipping, wheelspin on the Dyno? It just doesn't make sense |
Do you at least have a log of the dyno pull?
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Have checked timing and everything lines up as it should
No wheel spin on dyno as strapped car well Dont have any logs |
So had a look at car today and thought something wasnt right. Got another timing light and base timing supposed to be 10 deg when locked in ecu
Flashing around 6 deg. Looks like old timing light i used has seen better days |
Would the Log Manifold choke it? Cause too much engine back pressure? Is this the sort of mani you are running
https://www.enginebasics.com/Advance...omanifold3.jpg |
Yeah similar to your picture gr124
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Originally Posted by GR124
(Post 1571861)
Would the Log Manifold choke it? Cause too much engine back pressure? Is this the sort of mani you are running
https://www.enginebasics.com/Advance...omanifold3.jpg |
Yeah i didnt think the log manifold would be holding me back that much
Thanks shuiend At what point is it worth changing to say a 264 cam size or so on setup like mine and what kid of WHP gain would i expect ? |
You need to state your goals. It is much more likely that a different turbo choice is the right way to go. A 3071 w 0.86 A/R will be a poor performer on a miata for all except a very select few applications.
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Originally Posted by Turbo2004
(Post 1571879)
At what point is it worth changing to say a 264 cam size or so on setup like mine
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