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Only 120 hp after tune - looking for some help

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Only 120 hp after tune - looking for some help

 
Old 03-16-2019, 05:28 PM
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Default Only 120 hp after tune - looking for some help

I've got a 1999 ST5 car. I'd like to make about 160 hp, naturally aspirated. I thought I had the right combination of bolt ons to get to at least 140 hp, but it only dyno's at 120.

Please help me find the missing power. What am I doing wrong?

Specs:
BP4W rebuilt by me (could be part of the problem) - recent cold compression test (187, 182, 190, 170) - all valve clearances recently checked
Racing Beat Header - this is getting ceramic coated
Springfield dyno inspired exhaust
22" intake runner with k&n cone filter - adding an airbox to shield it from the headers - tuning shop found 5 hp by just adding a cardboard shield to the engine bay
skunk2 intake manifold
MS3PNP
Innovative wideband

I'm attaching my logs from a recent race, and my current tune. I had it dyno tuned by a shop. Before the ecu, tune, and intake manifold, it made 116 hp/116 torque. After tune and intake manifold, it makes 120 hp/109 torque.

Can I get any more hp through tuning? Do I need to aggressively deck the cylinder head? After that, do I chase power through the valvetrain or pistons? I'd like to do this as efficiently as possible.

Thanks! This forum is awesome.
Attached Files
File Type: msq
CurrentTune.msq (284.3 KB, 12 views)
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Old 03-16-2019, 06:08 PM
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I'd say something's wrong. You've got decent compression, but that's about 5-7 degrees more advance than I'd typically run. I may not be getting all of the power out of my naturally aspirated builds, but I also get 135hp out of bone stock junkyard VVTs and stock headers. A now illegal Spec Miata head, RB header, and nothing nearly as loud as your springfield dyno exhaust netted me 148hp. That was a VICs intake manifold too. What was your break-in procedure and how does your oil look?
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Old 03-16-2019, 09:28 PM
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Same dyno? Both runs weather corrected?
Did you touch the timing belt at all?

Are you running stock cam gears or are they adjustable???
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Old 03-18-2019, 11:23 AM
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Curly, thanks for the reference data. It's been years since I broke in the motor. If I remember correctly, I did a series of 2nd gear pulls. The oil has the occasional metal shavings. I had a hard time sealing up the head gasket, after the initial build, so I went with an MLS and added ARP head studs.

The 116 hp dyno run was in Houston, the 120 hp run was in Cresson. I'm not sure about weather correction. I'm running stock cam gears. The timing belt was refreshed during the rebuild, and I'm fairly certain that it's correctly installed. I checked again when I did my valve clearances over the winter.

So, aside from just swapping in a junkyard VVT, what can be done? Could there be power loss in the bottom end? Do I need to pull it apart and blueprint/balance it? Maybe my timing belt is incorrectly installed.

I'm all ears. I've got a few months until the next race, so I've got some time. Thanks.
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Old 03-18-2019, 11:34 AM
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you have something out of time I bet. that is a really crappy number for your mod list. balance is not the culprit here.
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Old 03-18-2019, 11:48 AM
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What kind of dyno? (Im assuming dynojet since youre doing it for classification, but just checking)
Definitely double check mechanical timing and base ignition timing.

Also, do you have a copy of the dyno chart? What RPM did it make peak power, and how high did the dyno operator take it?
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Old 03-18-2019, 05:30 PM
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$20 says you mis-timed the belt
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Old Yesterday, 09:12 AM
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Thanks for all the feedback. I'm definitely going to verify my timing, again. I found this wild dude on YouTube that has a good walk through. It sounds like I'm off a tooth on my intake cam.


Here's my latest dyno. This is with the intake manifold and current tune.

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Old Yesterday, 09:27 AM
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You don’t even make 120! Your sorta make 115 and then at the end it coughs and sputters out an extra 5hp briefly.

That flat hp curve is indicative of...something. Either a major restriction, or really crappy timing.
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