gothic_sera

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. 13.08@103.44 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?

HCI2000SS

iTrader: (2)

Wow yeah that's not right lol. What exhaust and intake do you have?

2xLS1

iTrader: (25)

What converter?

gothic_sera

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.

HCI2000SS

iTrader: (2)

Man I'm at a loss. I run a LQ9 with a cam almost identical to yours, and am WAY faster than that lol.

gothic_sera

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.



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

gothic_sera

Here's my current ignition table

gothic_sera

I found some of that missing power....

Best run today:
12.24@111.38

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 13.12@108.30 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

gothic_sera

Exidous

iTrader: (11)

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. :-/

gothic_sera

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.

rpturbo

iTrader: (47)

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.