Crawford Billet Power Blocks

[P@ul]

Those are some really bizarre looking changes in the powerband. You now a higher peak torque before the dip, and gain quite a bit more torque after the dip. Gains in low end torque do make sense for longer intake runners. The parts resemble tumble delete valves to me. The idea might have come from that, even though we dont have tumble valves.

I'm curious to see how much this powerband will change with tuning. I'd imagine there are a lot of games to be played with the cam phasing.

[ck-GT86]

subscribed. next paycheck...

.ck

[nelsmar]

Originally Posted by Turdinator

Thank you for the photos. I like how you can't really see them.

I wonder if the grimmspeed strut bar would still fit. Do you know how tall the blocks are?

I had measured yesterday but I forget... iirc ~37mm.

[Hawaiian]

Originally Posted by P@ul

Those are some really bizarre looking changes in the powerband. You now a higher peak torque before the dip, and gain quite a bit more torque after the dip. Gains in low end torque do make sense for longer intake runners. The parts resemble tumble delete valves to me. The idea might have come from that, even though we dont have tumble valves.

Holy Dejavu! I was just describing these to a friend as a tvg delete knock off.
@nelsmar will these be tested with a header as well? or just stock/tune vs block/tune?

Really, 4 dynos would be the best when you get to it, but I don't want to push you.

Stock, Stock + tune, stock + blocks, Stock + blocks +tune. It will give an idea of how successful the part is vs how much of it is leaning afr out.

[Vic]

Originally Posted by Turdinator

Thank you for the photos. I like how you can't really see them.

I wonder if the grimmspeed strut bar would still fit. Do you know how tall the blocks are?

going to take my chances with this one too, I have a grimmspeed strut bar and from that picture it looks like the bar might be in the way. im scareddd

[nelsmar]

Originally Posted by Hawaiian

Holy Dejavu! I was just describing these to a friend as a tvg delete knock off.
@nelsmar will these be tested with a header as well? or just stock/tune vs block/tune?

Really, 4 dynos would be the best when you get to it, but I don't want to push you.

Stock, Stock + tune, stock + blocks, Stock + blocks +tune. It will give an idea of how successful the part is vs how much of it is leaning afr out.

I will be doing:
1. Stock
2. Stock + K&N Filter
3. Stock + K&N Filter + Tune
4. Blocks + K&N Filter
5. Blocks + K&N Filter + Tune
6. Blocks + K&N Filter + JDL UEL Header (1-2 weeks after the first testing)
7. Blocks + K&N Filter + Tune + JDL UEL header (1-2 weeks after the first testing).
8. Blocks + K&N Filter + Tune + JDL UEL Header + E85 (2-4 weeks after testing).

"Untuned" Will be a rom i modified to disable fuel trims (so learning doesn't swing things), cam profiles locked to "low detonation" and IAM set to 1.0. That way it gets the highest baseline possible.

Is that detailed enough for ya?

I want to find out precisely what it takes to get to 200WHP on 91 with a balanced powerband. Both the JDL UEL & these blocks seems to peak at similar RPM's so I am curious how it will turn out vs completely stock.

[Captain Snooze]

I'm hoping that the JDL headers will extend the peak of the blocks. If that happens it would be so sweet as to render your blood sugar level off the scale. I just hope that they don't do some weird space time continuum thing and end up cancelling each other out. Btw, if you have time could you test an LS1 swap with and without blocks?

Originally Posted by nelsmar

[Turdinator]

Originally Posted by Captain Snooze

I'm hoping that the JDL headers will extend the peak of the blocks. If that happens it would be so sweet as to render your blood sugar level off the scale. I just hope that they don't do some weird space time continuum thing and end up cancelling each other out. Btw, if you have time could you test an LS1 swap with and without blocks?

Yeah I agree that if a header can flesh out the torque curve with a tune and the power blocks it will make for a killer bolt on setup.

@nelsmar you are quickly becoming a hero of mine

[Wepeel]

That's a bizarre dyno. 2-3k RPM looks really weird, maybe like there's some knock correction going on there, but even the stock curve - normally there's a nice broad hump from 2-3k RPM.

The spacers seem to actually make the torque dip worse, extending it maybe 3-400 RPM, then it comes on strong from 5300-6300, and then drops again. So far it seems like these are good only for improving power from 5300-6300. Stock is better 4000-5300, and 6300 to redline.

[Luis_GT]

Originally Posted by Wepeel

That's a bizarre dyno. 2-3k RPM looks really weird, maybe like there's some knock correction going on there, but even the stock curve - normally there's a nice broad hump from 2-3k RPM.

The spacers seem to actually make the torque dip worse, extending it maybe 3-400 RPM, then it comes on strong from 5300-6300, and then drops again. So far it seems like these are good only for improving power from 5300-6300. Stock is better 4000-5300, and 6300 to redline.

What? I see a shortened dip on the dyno charts

[Wepeel]

Originally Posted by Luis_GT

What? I see a shortened dip on the dyno charts

Oh derp me. The flash spot tricked my eyes. Looks like a nice improvement from 4000 - 6300.

[Hawaiian]

Originally Posted by nelsmar

I will be doing:
1. Stock
2. Stock + K&N Filter
3. Stock + K&N Filter + Tune
4. Blocks + K&N Filter
5. Blocks + K&N Filter + Tune
6. Blocks + K&N Filter + JDL UEL Header (1-2 weeks after the first testing)
7. Blocks + K&N Filter + Tune + JDL UEL header (1-2 weeks after the first testing).
8. Blocks + K&N Filter + Tune + JDL UEL Header + E85 (2-4 weeks after testing).

"Untuned" Will be a rom i modified to disable fuel trims (so learning doesn't swing things), cam profiles locked to "low detonation" and IAM set to 1.0. That way it gets the highest baseline possible.

Is that detailed enough for ya?

I want to find out precisely what it takes to get to 200WHP on 91 with a balanced powerband. Both the JDL UEL & these blocks seems to peak at similar RPM's so I am curious how it will turn out vs completely stock.

[86-tundra]

Originally Posted by nelsmar

I will be doing:
1. Stock
2. Stock + K&N Filter
3. Stock + K&N Filter + Tune
4. Blocks + K&N Filter
5. Blocks + K&N Filter + Tune
6. Blocks + K&N Filter + JDL UEL Header (1-2 weeks after the first testing)
7. Blocks + K&N Filter + Tune + JDL UEL header (1-2 weeks after the first testing).
8. Blocks + K&N Filter + Tune + JDL UEL Header + E85 (2-4 weeks after testing).

"Untuned" Will be a rom i modified to disable fuel trims (so learning doesn't swing things), cam profiles locked to "low detonation" and IAM set to 1.0. That way it gets the highest baseline possible.

Is that detailed enough for ya?

I want to find out precisely what it takes to get to 200WHP on 91 with a balanced powerband. Both the JDL UEL & these blocks seems to peak at similar RPM's so I am curious how it will turn out vs completely stock.

based nelsmar

[mav1178]

Originally Posted by Thorpedo

I'm not digging that loss above 7k...

As others have stated, everything is a compromise.

I think without a tune, this is a decent mod for a street car. More usable power earlier... and you'd just short shift at 7K instead of redline.

Originally Posted by Turdinator

I wonder if the grimmspeed strut bar would still fit. Do you know how tall the blocks are?

Around 1.5" tall.

Originally Posted by Wepeel

That's a bizarre dyno. 2-3k RPM looks really weird, maybe like there's some knock correction going on there, but even the stock curve - normally there's a nice broad hump from 2-3k RPM.

The spacers seem to actually make the torque dip worse, extending it maybe 3-400 RPM, then it comes on strong from 5300-6300, and then drops again. So far it seems like these are good only for improving power from 5300-6300. Stock is better 4000-5300, and 6300 to redline.

There's definitely a better low end, but what was telling was that my car was on the dyno for about 40 total miles to test. Several other things were tested, but over the course of 2 days there were more than 30+ pulls.

MotoIQ uses a SuperFlow dyno, which apparently reads a consistent ~10HP less than a comparable DynoJet. That said, my stock car put down around 148RWHP on their dyno, compared with around ~142-144 for most of the other FRS/BRZs they've tested.

-alex