before/after 383 dyno results

[randy331]

I'm lost until I go back to the first post and read it all again. I can't even remember what heads are on it!!!!! Old age sucks.

Brodix Tract 1s.

Randy

[Warp Speed]

Would be interesting for Warp Speed / Jay to weigh in on how much they look at BSFC since MPG does at times come into play.

Stan

Actually, we don't.

[Kevin Johnson]

https://www.sportskeeda.com/f1/f1-6-rac ... e-last-lap

Key phrase: "Such a sight is almost non-existent in the modern Formula 1."

[zums]

Is he going to complement the engine by getting the right converter and gear, will he try spacers or collector tuning, or is he the type to hang the dyno
sheet on the wall and just drive it as is, what spacer did you try, PR, open, reversion?
Tom

[randy331]

Is he going to complement the engine by getting the right converter and gear, will he try spacers or collector tuning, or is he the type to hang the dyno
sheet on the wall and just drive it as is, what spacer did you try, PR, open, reversion?
Tom

His new converter showed up today, so yes, he'll get the right converter. LOL
Sent the dyno sheet to Coan and had them make one.

Tried a 1" taper spacer and it was worth a very small amount of power, so we didn't test others.
It's making enough power for a factory block.

He'll try whatever I or his chassis guy suggests.
I'm suggesting get in and see what it runs like for now.

Randy

[Rick360]

Is he going to complement the engine by getting the right converter and gear, will he try spacers or collector tuning, or is he the type to hang the dyno
sheet on the wall and just drive it as is, what spacer did you try, PR, open, reversion?
Tom

His new converter showed up today, so yes, he'll get the right converter. LOL
Sent the dyno sheet to Coan and had them make one.

Tried a 1" taper spacer and it was worth a very small amount of power, so we didn't test others.
It's making enough power for a factory block.

He'll try whatever I or his chassis guy suggests.
I'm suggesting get in and see what it runs like for now.

Randy

Hope he's ready to hang on. With 100hp more and a good Coan stalling right should make for an interesting first pass.

Rick

[randy331]

So look in at the dyno graph, where should stall speed be ?

Randy

[zums]

If it were me, for starters i would shoot for 65-6700
Tom

[GARY C]

Is he going to complement the engine by getting the right converter and gear, will he try spacers or collector tuning, or is he the type to hang the dyno
sheet on the wall and just drive it as is, what spacer did you try, PR, open, reversion?
Tom

His new converter showed up today, so yes, he'll get the right converter. LOL
Sent the dyno sheet to Coan and had them make one.

Tried a 1" taper spacer and it was worth a very small amount of power, so we didn't test others.
It's making enough power for a factory block.

He'll try whatever I or his chassis guy suggests.
I'm suggesting get in and see what it runs like for now.

Randy

Hope he's ready to hang on. With 100hp more and a good Coan stalling right should make for an interesting first pass.

Rick

If he is like most racers he will be happy the first night out and then his only thought will be how to go faster... That gets a lot harder now.

The first port job and cam change I did of any significants was good for a little over 1 second et on my 377, everything after that was enough to piss you off and a lot more work.

[paulzig]

What did Coan give him a 6200RPM 7" converter??

[MELWAY]

What did Coan give him a 6200RPM 7" converter??

If this thing has the grunt the dyno sheet says it won’t need a 7” to get 6200 stall

[randy331]

It's an 8" converter.
Coan says 6200-6300, I was thinking a little more than that.

Randy

[KnightEngines]

I'd agree with coan, you don't want the rpm kept artificially high by the converter, you want it locked up & not slipping & sapping power to keep rpm up.
If the motor would drop below stall speed on the change without the converter keeping it up then you're wasting power.
If you think it'll run out to 8000 & not drop below power at 6500 then maybe it could use more stall.
It is very possible to have too much converter.

[Rick360]

I'd want it to stall 6500.

Rick

[Stan Weiss]

I'd agree with coan, you don't want the rpm kept artificially high by the converter, you want it locked up & not slipping & sapping power to keep rpm up.
If the motor would drop below stall speed on the change without the converter keeping it up then you're wasting power.
If you think it'll run out to 8000 & not drop below power at 6500 then maybe it could use more stall.
It is very possible to have too much converter.

I think it will. But it would have been nice to see a dyno pull that high to be positive.

Stan