Trying to help this guy out are the excrementals way off?
1.568
4.409
6.771
103.56 mph
8.83
10.584
128.73 mph
3200# sbf 400” 3.90 rear c4 trans 8” chance converter
Thank you

It appears to be crawling off the line. 1.45 60’ and 6.50 1/8 mile et are numbers that better match his 1/8th mile mph. I understand he’s racing 1/4 but more gear And/or more traction may help the time slip look more balanced.

The 60' is about a tenth or more slow for that mph in my opinion.
If the engine leaves the line cleanly, it's the convertor or suspension in my opinion.

6.50 3250 lbs is 106 - 107, ain't it?

I go 112 holding a little 6.50 index 3250 lbs. I got a home built, do-it-yourselfer sbc though.

This message has been edited. Last edited by: Mike Rietow,

Trans keeps burning high gear clutches.
Could that have some dragging effect on this?

quote:

posted January 04, 2021 06:32 AM Hide Post
Trans keeps burning high gear clutches.
Could that have some dragging effect on this?

absolutely

Converter too tight and it needs gear.

What diameter tire is it sir?

quote:

Originally posted by B.C.Malibu:
Trans keeps burning high gear clutches.
Could that have some dragging effect on this?

Assuming nothing stupid is going on such as shifter linkage not adjusted correctly or ?, find another trans builder, there is no way your combo should be hurting high gear clutches!

quote:

Originally posted by TOP38:

quote:

Originally posted by B.C.Malibu:
Trans keeps burning high gear clutches.
Could that have some dragging effect on this?

Assuming nothing stupid is going on such as shifter linkage not adjusted correctly or ?, find another trans builder, there is no way your combo should be hurting high gear clutches!

I was thinking the same thing. Who did the tranny and what do they say about burning up clutches that there is no way you should be hurting.

275/60 or 28” tall.
Traps at 6600rpm

Agree with others - look at 60' time. My much slower Chevelle was a tad quicker than you in 60', see below.

quote:

Originally posted by B.C.Malibu:
275/60 or 28” tall.
Traps at 6600rpm

6600 1/4 mile @ 128 mph, the converter is slipping 0%.

You must mean 1/8 mile? If not the converter is way too snug.

0% at 7800 - 8000 - 8200 rpm, would be an indication the converter is correct.

0% @ 6600 128 mph, says the converter is way too efficient.

Ya gotta be specific, ya gave 1/4 mile data, I can only presume you're speaking 1/4 @ 128 mph.

The info is for the 1/4 mile with the incremental numbers for the pass.

This message has been edited. Last edited by: B.C.Malibu,

quote:

Originally posted by B.C.Malibu:
The info is for the 1/4 mile with the excremental numbers for the pass.

Converter needs a stator & adjustment, this converter wasn't built for a sbf. It should cross around 7300 with the converter right for the cars sbf, slipping 10%.

Then you put a 4.30 gear in it, it'll cross 7600 slipping 6 - 7 %. It'll also et quite a bit better with the 3.90 gear slipping 10%, crossing 7300 rpm, though too.

Incrementals..as in, increments

FYI.

3.90 rear gear wow

He has a friend do his c4 who is a trans guy.
Has great luck with aode and gm stuff.
The C4 is kickin his butt though.

Broken sprag in the converter? Transbrake or footbrake? If transbrake, does it lug the engine going to the two-step?

Footbrake car