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Why doesnt my motor make power?

 
Old 07-29-2016, 04:23 PM
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Default Why doesnt my motor make power?

Ok... I have an LQ9 in my 2nd gen Camaro. The spec of the car and motor is in my signature.

Thing is it doesn't perform any where near like I think it should or compared to others.

My best run in the car is in this video. [email protected] with 1.80 60' (street tyres). I've run faster at 105.4, but higher ET. I was expecting the mph number to be more like 112/114.


The ECU is megasquirt 3. Ignition advance is 25deg from 2200rpm up. Compression ratio is 10.5:1 WOT AFR is stable at 12.6/12.7

I've verified the advance with a timing light and know it's correct. I've also checked cam timing.

Anyone with any input of where I should look?
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Old 07-29-2016, 04:29 PM
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Wow yeah that's not right lol. What exhaust and intake do you have?
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Old 07-29-2016, 05:07 PM
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What converter?
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Old 07-30-2016, 01:57 AM
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Stainless long tube headers with 1 7/8" primaries. Rest of it was 2.5" with x-pipe and thrush mufflers. I've just ripped that out and fitted a 3" pypes system with race pro mufflers. Haven't run it with that yet to see if there's any difference.

Intake is a sheet metal one, same as the TSP one. 102mm throttle body. And it definitely gets full throttle.

Converter is an FTI SRLT 4000rpm stall hard hit.
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Old 07-30-2016, 09:13 AM
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Man I'm at a loss. I run a LQ9 with a cam almost identical to yours, and am WAY faster than that lol.
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Old 07-30-2016, 01:35 PM
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I'm completely stumped...

It sounds healthy and runs OK. I've bumped the ignition timing up to 27 deg ready for my first pass tomorrow. My last was at 25. I went out on a local private road and did some playing. The shot below is from the datalog. AFR at 12.7, 26.9 deg advance.

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When I got home I puled #1 plug to have a look. Large image in the link below.

http://s5.photobucket.com/user/flak_...dmfio.jpg.html

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Old 07-30-2016, 03:22 PM
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Here's my current ignition table

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Old 07-31-2016, 01:47 PM
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I found some of that missing power....

Best run today:
[email protected]

That's with a 1.77 60', lots of wheel hop and street tyres.


I gradually increased the timing over 6 runs, 1 degree at at time until I stopped picking up speed and then backed it off a degree.

My first run with the timing table I previously posted was [email protected] but I had 20yds of wheel spin out of the hole.

I saw steady increases in the MPH as I increased the advance. It's now 30deg from 3500rpm and up and it seems to be OK...

I'll post a video of the run when it's uploaded
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Old 07-31-2016, 02:01 PM
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Old 08-08-2016, 07:38 AM
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Is that all that you've changed? 3* does not seem like a lot for 8/10th and 6-8MPH. I'm right around 29* as well but top end is a bit different. Don't have a strip nearby though. :-/
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Old 08-08-2016, 07:47 AM
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Started at 24 deg and ended up at 30 deg for the quickest run. Also fitted a 3" exhaust system with turbo style mufflers rather than the 2.5" chambered ones I had previously fitted.

My AFR is a bit low at 12.4, so pulling a bit of fuel out of the VE table should help pick up a few more MPH.
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Old 08-08-2016, 09:48 PM
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One question, did you degree the cam in, and make sure it was correct? Just guessing, but sounds like the cam is off. If I had not degreed in my cam, it would have been ~4* off.
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