Big oof, if it's like that, discretion is advised. Bearings could be on the edge.

 

Well you never know

 

Well...I stand corrected then. If you have no swirl plates, and you're pulling a vacuum at WOT, I'd guess that the TB's need to be bigger. I guess I'd make one more test w/no air filter to ensure that the filter isn't causing the vacuum.

 

Yeah thanks for your input Tom. I don’t plan on doing much more to this car. If I can find a second set of throttle bodies cheap I might have a tinker, but at this stage I will just work on refining the tune. The car is a daily driver so making it drive nicely in most conditions is the priority.

 

I understand and agree with that thinking. Fun is king, so if it runs great...mission accomplished.

 

Thanks, never got a dyno sheet on it. She ran hard but I didn't want to tune one again lol
Have a 355 that will get a renegade intake but I'll have it in a stock ecm. Luna grind similar to the old Crane power max. Got to get the trans back in and freshen up the suspension and some wear items

 

Mine didn’t go as well as I had hoped with the standard ECM and I thought I had chosen a pretty mild cam, that's why I ended up getting an EBL Flash. I really do like that ECM but I wish there were some canned tunes that were a bit closer to my set up. Tuning is time consuming and probably never ending.

 

Just gave my 84 road car some love

 

My little corvette made 270hp on the rear wheels today on a Dynodynamics eddy current dyno. I’m pretty happy with that. The dyno has some sort of conversation algorithm to convert to flywheel HP and that number was 330HP.

 

Here is the footage for your viewing pleasure. It’s nice when the hear the sound of the small block Chevy over the whine of the dyno.

https://drive.google.com/a/martin.id...w?usp=drivesdk


https://drive.google.com/a/martin.id...w?usp=drivesdk

Edit: links should be accessible now.

 

I was very confused about the steering wheel location for a minute. Then I remembered.

 

Haha yeah it was RHD converted in about 1991 when it was imported.

 

Greg was that over at Ben's garage by chance? Sounded good.

 

No Tom we found a guy who will hire out a dyno for $80 an hour or $500 for the day (day can be as long as you want). We took one of our racing BMWs down to get the Haltech ECU dialed in. Then we put my corvette on the dyno to sort out its fuel map. Interestingly Ben and this guy know each other, they have the same dyno (Dyno Dynamics) and share software versions and notes. Ben has fixed the computer on this blokes dyno in the past.

So getting back to the tune we found that the fuel tables were very rich in the low and mid range and a bit light on at full power. A/F in the lower range was 10-12 so way too rich. I had to leave a bit of fuel in around idle or it would hunt but generally I pulled about 5% out of the table. Then up at full noise I added about 5% or so. We had the A/F trace up on the dyno and we managed to get it level where previously it started rich and finished lean. The funny thing was I tried some VE learns on the dyno because it’s perfect for moving from load cell to load sell but the results were wrong. I could see on the dyno it was very rich 10ish and the learn was suggesting to add fuel. So my WBO2 may need replacing or recalibrating. The engine does like the timing all in at 36 deg. We pulled 2 deg out and it lost 2.5hp so we put it back. The engine recorded 2 knock counts on the pull so that probably right where we want to be.

 

OK, thanks. I thought maybe that was Ben's shop. I use a DD as well with my car in Lake Havasu. $80 US would be VERY cheap per hour and could only wish that is that much, even though the shop does give me a good rate since I was a former student at EFI University. Yeah, 10-12 is kind of fat, idle would be around 14.7 same for cruise, WOT you should shoot for 12.6 -13.2ish, whatever the motor wants/likes best. It should dip down a tad at tip-in then rise to where you want and hold that AFR all the way out or close to it. Your WB may be a bit wonky, hard to say on this end. My timing is 35* and seems to like it there. Just a reminder, that learn mode will learn the up side and the down side, hence the spike peaks and valleys. Which will also effect DFCO table. I think you are beyond learn mode now and would stop using it. Just go by WB, AFR and power/torq data. Move in four cell increments as you make the changes ie.. four cells that are around the one you are changing, up and down.

 

Good advice there Tom I think I’m pretty close now. I just pulled the plugs out and they had that lovely biscuit colour, so I put a set of iridiums in and called that job done.

I should have got some photos in Ben’s shed (well concrete building really) it was like Aladdin’s cave. Everywhere I looked there was something cool; his 84 Vette, 66 mustang, a two door valiant that you guys would know as a Dodge Dart, an AMG C63, mini copper S, there were other cars too but I can’t remember. Everywhere I looked there was something, LS engine, SBC, Holder 308 V8, etc, etc. oh and I almost forgot a Honda CBX 1000 across the frame six cylinder.

 

See PM.

 

Today I was talking to my friend who did the dyno tune on this car originally. Just to recap he has a whole lot of toys in a shed including a dyno and a very fast 84 corvette.

Anyway he tells me that when he updated the software on the dyno he didn’t copy the calibration files over properly and the result is that it reads 50+ HP under. So the original HP figure of 210HP was at least 50HP short. OK so that explains why the car could pull 270RWHP last weekend run after run with fairly minimal change to the tune.

There are always lots of questions on this forum centered around what mods will yield what sort of HP improvements. So I thought I would remind everyone that my HP improvements are basically bolt on. The bottom end is untouched, the throttle bodies are not bored and the fuel system is basically stock although the pressure is 15psi or so.
Here is a list of the mods:

Crane Cams Hydraulic Flat Tappet Z-256-2
Edelbrock Cylinder Heads Alloy E-Street ED5089
Comp Cams Roller Rockers High Energy Alloy 1.6 Ratio
Renegade Intake Manifold
Pacemaker Headers Primary Pipes 1 3/4 “ Collector 3"
DUI Distributor
Exhaust 2 1/4" Cat Delete
AIR Pump Delete
EGR Valve Delete

So these mods can deliver 270HP or so on the rear wheels.

 

So in theory I'm making atleast 270 to the wheels then? also, God damn is that a baby cam!

 

Isn't CFI a wondrous thing with the right mods? You are yet another happy CF owner that has made it work with bolt on equipment and a tune-able ECM. Nice job to you both!