Stock 91-93 Dyno Chart?

[LQ1Fiero]

I have done a number of searches on this forum looking for a stock 91-93 dyno chart that I can use as a baseline to compute volumetric efficiency.

The only dyno charts that I can find are charts of modified engines and one chart from a 96 engine.

Could someone provide me a link to a stock 91-93 dyno chart?

[LQ1Fiero]

I found a stock dyno chart for a 96 engine so I ran my numbers based on it.

This all assumes:

• Drivetrain loss = 15%
• A/F ratio was 12.5:1
• BSFC of .45 lb/hr of fuel per hp

Based on the stock 96 dyno chart here:

http://fiero.cc/fiero-tdc/members/mws/intake/index.html

I came up with:

2000 rpm 84%
2500 rpm 82%
3000 rpm 86%
3500 rpm 81%
4000 rpm 95%
4500 rpm 93%
5000 rpm 92%
5500 rpm 84%
6000 rpm 78%
6500 rpm 67%

On the modified engine from the same page:

2000 rpm 81%
2500 rpm 82%
3000 rpm 83%
3500 rpm 77%
4000 rpm 79%
4500 rpm 81%
5000 rpm 92%
5500 rpm 100%
6000 rpm 101%
6500 rpm 100%
7000 rpm 93%
7500 rpm 83%

[LQ1Fiero]

The numbers based on this custom cam:

SPECS ARE AT .050
Custom:
INTAKE:
Lift: 396
Duration: 220

EXHAUST:
Lift: 411
Duration: 228


3000 90%
3500 93%
4000 96%
4500 99%
5000 105%
5500 111%
6000 102%
6500 95%
7000 85%

[LQ1Fiero]

I ran the numbers on Steven Snyder's chart from here:

http://60degreev6.com/forum...highlight=dyno+sheet

The results were very impressive for stock cams and timing. This was taking into account that he is overbored to 208 ci from the stock 204:

2500 rpm 102%
3000 rpm 104%
3500 rpm 102%
4000 rpm 104%
4500 rpm 107%
5000 rpm 101%
5500 rpm 104%
6000 rpm 97%
6500 rpm 88%


I am starting to see that if you want to get to 300 hp without forced induction, then the engine is going to have to rev to at least 7000 rpms with 100% VE at 7000 rpms or rev to 7500 rpms with 92% VE. All of the setups that I have seen so far drop off sharply at 7000 rpms.

It appears that take to get to 300 hp would take a big intake such as Michael Smith's along with custom cams with .400-.410 lift and slightly extended duration. Michael Smith was at 280 hp at the flywheel so if he had better cams, I think he would have gone all the way to 300. That speaks a lot about the potential of the engine.

I think I know what I will be doing over the next couple of years.

[fieromadman]

Interesting number crunching. I think with headers, a shorty intake manifold, and the custom cams that I have 300 CHP wouldn't be impossible.

[RedZMonte]

i will look for my dyno stock w/ intake and borla catback ('95 Z34)... I know i have it somewhere.... Framed i think, I put down ~6HP more then michael did in his 5spd that day! lol (Just teasing you a little michael if your reading threw here).... But he beat me by ~9ft/lbs tq IIRC.

I put down like 178hp and i think 160tq...

headers, cams, head work (springs, porting, ect) and good headers and a good tune should get over 300hp...

S

[stanleydog]

I have 2 -92 z-34 and one is a cherry with 50,000 onit the other is apart for hot rodding so I am looking for any speed stuff anyone has. I have a local to do the cams, Oregon Cam Grinders in Vancouver, Wa.Some specs on it would be appreciated, and the cylinders look alittle thin for stock bore. Am getting JE pistons but unsure what size to order. Stanleydog