Who can guess what mod my car NEEDS next?

[Drifting Thunda]

Just thought I'd kinda quiz y'all. I already know the answer. Here's my dyno chart which indirectly gives you the answer sort of:

 

[Omnis]

an air filter or a new transmission?

 

[TheCracker]

A new driver?

 

[Drifting Thunda]

What the heck!? Hehehe, not even close.

 

[bleurabbit7]

It looks like you need to remap the ECU and get those curves to come later. Hitting your max before 3 grand and seriously dying off like that.

 

[Omnis]

It looks like you need to remap the ECU and get those curves to come later. Hitting your max before 3 grand and seriously dying off like that.

yeah. that's what hit me in the face like 5 minutes after i posted my "humorous-substitutes". total brainfart, there...so i couldn't just say nothing. 👍 lol.

 

[Drifting Thunda]

Well the horsepower doesn't "die off" too bad... The torque is steep like that because of the overdriven roots supercharger. Closer, but not quite it.

Okay here's a hint: It has to do with the way the line gets all zig-zaggy after 3,800 rpms.

 

[Omnis]

an oil change? new cams? lol. this is for your '94 car?

 

[Drifting Thunda]

Yes, the '94. It's a pushrod V6 so only one cam, but that's not what it needs (though that sure as hell would wake this thing up a lot!).

 

[///M-Spec]

I don't know much about tuning FI cars, but the power drop between the 1st and 2nd pull would concern me a little. Maybe you want to upgrade your intercooler or do some water injection?

Is that spike at 3800 RPM normal? The 2nd pull doesn't have it. Maybe the ECU retarded the timing due to heatsoak on the 2nd pull?

Just guessing here.

Dude... your dyno is almost 4 years old If the sheet is showing a problem, maybe you should get around to finally fixing it?


M

 

[Famine]

Two most important upgrades on any car:

1. Driver.
2. Tyres.

 

[Omnis]

oh, i figured it out...



install v-tec.

 

[Drifting Thunda]

I don't know much about tuning FI cars, but the power drop between the 1st and 2nd pull would concern me a little. Maybe you want to upgrade your intercooler or do some water injection?

Is that spike at 3800 RPM normal? The 2nd pull doesn't have it. Maybe the ECU retarded the timing due to heatsoak on the 2nd pull?

Just guessing here.

Dude... your dyno is almost 4 years old If the sheet is showing a problem, maybe you should get around to finally fixing it?


M

I'm not sure about why exactly the power dropped between the pulls. They did only wait 11 minutes for it to cool down though.

In the first pull, the knock sensor noticed the air/fuel runs lean once the boost is to a certain point (I think about 14 psi at that rpm) and adjusts timing in a power robbing manner which shows up as those spikes on the chart. The car cannot pump fuel fast enough for the boost. I need a better fuel pump and possibly a new fuel filter to match the overdrive pulley on the supercharger. The intercooler(s) should be good with the huge fan behind them.

The dyno is old because this car was retired as a project by the previous owner in 2002. I'm picking it back up.

I at least plan to upgrade fuel pressure and get a bigger cam and install a shorter gear this summer, and possibly port heads and port-match blower inlet to the throttle body. Then I'd like to retune.

 

[///M-Spec]

Gotcha. Nice to know I was at least in the right neighborhood. Maybe it's leaning out because of the injectors as well? Is it normal to use the stock injectors on the car when upping the boost or would a new pump cover it?


M

 

[Drifting Thunda]

oh, i figured it out...



install v-tec.

Yeah... just--yeah...

 

[Drifting Thunda]

Gotcha. Nice to know I was at least in the right neighborhood. Maybe it's leaning out because of the injectors as well? Is it normal to use the stock injectors on the car when upping the boost or would a new pump cover it?


M

Yeah your thoughts on it were very good I thought.

Normally injectors could very easily be an issue but the '94 and '95 SCs came stock with 36# injectors, which should be good until I go higher than 18 psi I think.