306 dyno results

95Vert · Jun 19, 2006

A buddy of mine just got his 306 dynoed and made a whopping 258hp and 280tq. He's got gt40p with 3thing valve job, 1.6s roller rockers, ported, f-cam with holley systemax intake and shorty headers with h-pipe. he's got the stock inj, maf and gears with a 5-sp. He set the timing at 12*. They found a problem with his ect. They told him he was running rich because of this and causing power loss. Does this sound right? What should he be at?
Thanks

TheRedBlur · Jun 19, 2006

cars that are built, need tuning. was it a mustang dyno or dynojet? just curious.

95Vert · Jun 19, 2006

probably a dynojet. i pulled 240/260 with my combo when it was auto.

Guero · Jun 19, 2006

whats the power difference form a 302 and 306?

stprorolla49 · Jun 19, 2006

Guero said:
whats the power difference form a 302 and 306?

20hp plus or minus a few

Guero · Jun 19, 2006

hell yeah!!!!!!!! lol

bill302 · Jun 19, 2006

Guero said:
hell yeah!!!!!!!! lol

it has to be running to have the extra horse power guero.lol.

Guero · Jun 19, 2006

basterd!!lol it will be soon!!!!

95Vert · Jun 21, 2006

bill302 said:
it has to be running to have the extra horse power guero.lol.

5spd GT · Jun 21, 2006

302 to 306 hp difference is maybe 3-5hp.

Timing could probably be a bit more than that...try 14* or so...

GRGT1994 · Jun 21, 2006

Guero said:
whats the power difference form a 302 and 306?

About 4 cubic inches.

Zero Signal · Jun 21, 2006

I think the 20hp came from the assumption that you are replacing an old worn out stock shortblock with a very well built 306.

Guero · Jun 21, 2006

yeah mine had 150,ooo miles on it

5spd GT · Jun 21, 2006

Zero Signal said:
I think the 20hp came from the assumption that you are replacing an old worn out stock shortblock with a very well built 306.

I didn't gain anything with my 306 and longtubes from my old 162k bottomend.

I also added a ported intake, which I attribute to the gain of the .51 mph I gained after those additions.

The new engine was probably pretty tight, it had about 1000 miles on it.

A loose engine has less friction (lots of miles) and can free up some horsepower.

urban96 · Jun 21, 2006

ya i think any gain from 302-306 would be from bad/worn rings and going to a better rotating assembly and oiling system

TheRedBlur · Jun 21, 2006

5spd GT said:
I didn't gain anything with my 306 and longtubes from my old 162k bottomend.

I also added a ported intake, which I attribute to the gain of the .51 mph I gained after those additions.

The new engine was probably pretty tight, it had about 1000 miles on it.

A loose engine has less friction (lots of miles) and can free up some horsepower.

actually, a loose engine has more friction from improper oiling and increased vibrations.

tmoss · Jun 22, 2006

The Holley intake is not the best choice for that combo.........

5spd GT · Jun 22, 2006

TheRedBlur said:
actually, a loose engine has more friction from improper oiling and increased vibrations.

Talk to the Pure Stock guys, as 25thMustang says..."loose is fast"...

Many know tight engines can eat up a bit of power...

TheRedBlur · Jun 23, 2006

5spd GT said:
Talk to the Pure Stock guys, as 25thMustang says..."loose is fast"...

Many know tight engines can eat up a bit of power...

Loose is fast is a term referring to driving style, not sloppy engine build. Loose is when you are cornering at the car's limits, and it slides a bit, with cars like ours, we usually oversteer a bit. Loose is a term referring to oversteer. When a car is loose, you are swinging it around the corners, maintaining your momentum, making higher speeds on the straights, "tight" cars that understeer, will plow the front end through turns, scrubbing off momentum that needs to be built up again during the straights. I wll agree with you on this though, an engine with too tight of clearances will eat power, that would be an improperly built engine, but the same goes for too much slack. An engine with loose connecting rods will rattle and not sustain high rpms or horsepower. An engine with loose tolerances on the main bearings (crankshaft) will have a crank that vibrates excessively, ruining harmonic dampers and wearing the timing chain/lifters and valveguides. Not just that, but the crankshaft would walk back and forth in the block. I could go on. If loose tolerances were beneficial to engine builds, then everybody would be doing it, and burning a lot of oil in the process. I know for sure that Panoz, with thier 7000+ RPM 5.0 that they used to run a few years ago, generating about 500 N/A horsepower did not have loose engine tolerances. that goes for LeMans endurance racing as well as Trans-Am and Grand-Am cup. hell, the same goes for nascar and top fuel. If you still don't believe me, go ahead and call a local performance engine builder.

94GTLaserRC · Jun 23, 2006

tmoss said:
The Holley intake is not the best choice for that combo.........

:Word:
Make sure if it gets the right tune you post back the results.
RC

306 dyno results

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