95 Berlinetta Dyno. 2.7 vs the world! ;)

Jim, was the same dyno used on both cars. That is a significant increase in power over the later car. Aren't you glad you bought a 95? My car was built in September 1994.

 

Is your 95 a euro as well? Mine pulls very hard too, the 99 was a different power band on my experience. wonder what difference if any is in the fuel maps or other setups.

 

very nice dyno run! looks like you did the pull in 5th.
I seem to recall reading somewhere that 5th was the correct gear for 355.
whereas usually it's 4th on most cars.

how are those magnaflow cats holding up?
I remember your other thread when you installed them.
what was the company again?

when you say secondary cat delete, you deleted the y-pipe and capped off the bypass?

and what are eproms?

 

recalibration of what? the air fuel ratio?

are these chips available now.

do they actually plug into the ecu?

 

Thanks for posting those. I dyno'd my Challenge car and it produced numbers similar to your 99 car on a Dynojet as well. There is another thread here where a member with a Challenge car dyno'd in the 290 range on a Dynojet and after some tuning at the shop got it up to around 320 rwhp. I asked what they played with and was told fuel and ignition timing.
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My car has 360 Challenge headers (which have a larger diameter runners), no y pipe, high flow cats, straight pipes that x just before two custom mufflers. I would be curious to know how the exhausts play a part in power for these cars. Any idea's?

 

Looks pretty clean

Like you said leave it alone you could go more by looking at the AF

Very similar to my 97 spider powerband you have a little more down low under 4500

 

Yeah your exhaust is working for sure

Loose that single bypass valve and really see something, you will need to fatten the mixture up for sure and dial in more timing

LOL Yeah I'ma crackhead too

 

One is neat then 2 are better LOL

A guy on ebay has aftermarket ones for $130 that are the correct ID mm size
I have one left but he has dozens

 

To be honest I pulled out at the top end because I was nervous at that high wheel speed. LOL

I will have to check the cats and report back on what they are. I also might swap in a full straight pipe system just to see what the differences are.

On another note, I'm going to Monterey in August for the FCA meet. Any shops nearby that have experience with Challenge cars that I could visit with mine?

 

Multifocal PVCs
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Nice dyno run, Jim.

Barry

 

what year is your car?

 

Why is the torque figure so high? I've never seen a 355 with more than about 225-230lbs torque on a dynojet

 

The interference is caused by spark plug wire cross talk and heat. Your engines run hotter and those pesky wires are all snugged up in the valve cover channels. Have your tech do it observationally. We use a guy with a Dynapak and it seems to work fine. Yes, 4th gear in the 355's, but the F1's have a different gear set, I remember.

Chip programming for 355's is tricky since there is only a single year for Motronic 2.7's. Well, more if you include the Challenge cars. Those are the chips I'd use. Get someone to burn you a set of Challenge chips. That's 355 Challenge, not 348, in case you were wondering.

You should be able to generate over 400 HP gross adjusted with your mods. Depending on the dyno this would be about 340 on a Dynapak and maybe 305-320 on a Dynojet, but I need to check that. The 2 systems measure very differently, hence the variation. Dynapak is a hub dyno, Dynojet is wheels on the barrel type, which I think is too variable. The Dynapak has software that adjusts for the gear ratios - you just key in the model and it plugs the right numbers in.

Regardless, don't get hung up with the absolute numbers. They are highly variable. You are more concerned with the differences between your base run and successive runs as you modify.