As for power from cat removal or higher flow, I have seen on TV of a LS1 'maro dynoing - it only gained a meager ~3%. You won't get the same result w/ a 4 banger w/o any FI work.

 

Alright I got every tuned and ready. I'll post the sheet later on today. I never got around to doing on Sat. There was a decent gain after tuning. I hit 129HP and 120TQ without tunning and 133 HP and 126TQ with tunning. Plus huge increases in usuable power from start to redline. I gained back all the TQ plus more after installing the header. First and second gear feel really nice. 3rd and 4th pull nice to redline and 5, well 5 is a passing gear and alway's will be. Hahaha. Let's get your comments after I post the dyno's.

 

damn thats a little under where i'd thought they'd be... did you try getting the cam gear and adjusting cam timing as well. Usually to get the most out of the cam you have to use the cam gear to degree it in.

 

No, I havn't messed with the cam timing yet. The only thing I've tuned is the A/F. The guy at the shop said he could probably squeeze another 4-5 HP with a adjustable cam gear. I actually like the way these numbers feel. I get on it and after 3500 it just sits you back on your seat. Of course not like a turbo would or anything but it has alittle kick back now.

 

Ok here's the dyno sheet as promised. I know it looks like i'm running lean but it should be within acceptable ranges. We checked for knock with a stethascope and didn't hear anything on any of the runs.

Let me know what you guy's think. Just to let anybody Know Mac Autosports is where I had my cam installed and they have been doing all the dynos for me. A great group of guys. They even gave me a discount on the tuning since it was my birthday.
Oh ya one other thing, if you can't figure it out, the blue run is with the RPW header and down pipe and the red run was with the cam installed but no header.
Look at how my entire power band is improved. That's what I was looking for.


Now without further adu!!

 

as for the hi flo cat, you can get a universal catco one and just get flanges welded on and that would be much cheaper, ca get the cat for 60 and welded for maybe 30, and install yourself, thast 60 under the rrm pricing.

 

good dyno... nice results accross the band. I still think that there are some spots in the lower rpms where you're to rich and the tail end of the run to lean. Even though you aren't hearing any detonation your temps are probably getting you close to pre-ignition... that's the silent killer that doesn't break pistons, it melts them and puts a nice divit in your cylinder wall. There is usually no way to repair a motor that has had a failure from preignition since it torches the cylinder wall so badly even .060 over won't take it out.

Ask the dyno shop if they'd be willing to pay for a new motor and install if the engine fails. If they say no then get that tail end down to 13:1 max. Trust me... i'm not banging your setup just trying to avoid you a loss when you have put in so much effort/cash. A good dyno shop should be willing to correct that for free since they let you leave like that.

 

Very nice gains there - just proof once again when we say that fitment of the camshaft should be one of the last mods you do to the car after you have done everything else.

Also nice proof that our headers are one of thebest on the market. Great results.

 

boe what temps should he be looking at?

 

I agree the air/fue ratio right on from 5500 rpm are starting to get a little too lean. Would be wortwhile richenign it up slightly and getting it back to a flat line.

 

With an NA car it's more about the AFR than the temps... this is due to the fact that you're not over atmospheric in the chamber prior to compression so the compression ratio is exactly what it's supposed to be 9.5:1... The motor can handle temps a lot better at that rate without knocking or grenading on pump gas.

I've pulled cars upwards of 900c on NA applications and they've lasted... but that was on motors pulling 11:1 with race gas... just tune to AFR and listen for knock. Just because you don't hear knock doesn't mean you can exceed the AFR. 13:1 on pump gas or you're going to have problems... been tested, tried and trued for years. 13.5:1 on the race gas is acceptable. Hell i've done 13.8/14:1 on C116 NA but that motor didn't last very long... it eventually just quit and after teardown two pistons had holes in them and one was welded to the cylinder wall... no wonder it wouldn't crank.

Trust me tune it down... you may find your hp drop a little but torque should increase a bit so it is a give and take.