2 years on my msd blaster and still kickin

 

Wouldn't a .40 over motor with a 6" rod be more than 357 cubes?

 

No.

 

Try an OBDI computer and KS.

 

That looks certainly like a ignition related issue. Check for stored DTC codes, just cus the light isnt on, doesnt mean they are not there.

If you have a ignition box, disconnect it and re dyno. Then go to coil, swap it out if needed. Also checking for grounds in the wiring harness or chassis to block ground straps. Before i forget, check the spark plug wires and other basic stuff.

Worse comes to worse you may need a ICM modual or your opti is dying (it has happend to new units)

 

Going to run 11.8:1 on my daily driven 93/94 octane car... :-)

 

One thing to reemmber, is that I think it was like 90 somthing degrees that day, wasn't it? I wasn't there, but i think i heard one of the local board members say it was pretty freakin hot early on in the day.

I'm sure you'll put up over 400 when you get the ignition straigtened out, and dyno on a cooler day. I think we are going to have another dyno day in a month or few.

 

If your car is still OBDII then you should think about switching to OBDI.
I had a similar problem at 5,200 and the fix was OBDI. Check this out:

Dyno Run

After switching to OBDI the curve is smooth. I agree with SS MPSTR 100%.

 

93turbo5oh,

Whose bench did you see my heads flow less on?

Lloyd Elliott
972-617-5671

 

No kidding. turbo5oh, Couldn't it be a possibility that the bench they were flowed on was actually not set up properly and flowed less than real numbers. People are always so quick to bash.

 

I think your valve train is floating. What springs are you running, and lifters and what are your valves set to, ie Per Comp Cams recommendations?
There are 2 articles on the market, Sept Corvette Fever and new issue of Popular Hot Rodding, talking about too much spring pressure causing lifters collapse, and how the Beehives are stopping that. Good articles. You may be experiencing this valvetrain issue.
A friends 383 has big fat springs on his 565 lift cam, and he is collapsing at around 5700 rpm.
Something to look at. IMHO

 

With out tearing back into the engine, just re checking the valve setting and some good hands on tuning will help alot. Just getting that graph smoothed out should get you in the 390 RWHP range. Maybe 395 or over with a good tune.

If you were tearing back in the engine, get some more compression (free horse power) and make sure that cam is the best choice.

My comment for 93turbo5doh was more about him seeing the heads flowed. Just making sure that he saw them flowed and not just repeating someone elses words that says they saw them flowed. You know how these things spread, LOL. Most of my stock valved heads flow about 255-260 cfm and the larger valved heads flow about 265-275 cfm depending on application. I can assure you the heads are not the limiting factor here, LOL. Kryckter made 415 RWHP with the stock valved heads and a "correctly designed" much smaller cam although he did have more compression.

Lloyd Elliott
972-617-5671
Eportworks.com

 

did you replace the opti during the buildup?


many people with bad optis have experiend high end breakup/misfire looking like that on the dyno sheet.

 

I agree... heads are far from the problem here.

 

That makes me feel good going for my 430rwhp n/a goal... :-)