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PostPosted: Tue Apr 02, 2019 7:47 pm 
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I’m trying to get a handle on what a competitive E Prod wheel horsepower number is. In general, are these cars almost always making over 200hp or more that are winning races in the majors?

I am having a hard time getting my GSR to make a ton of power with the restrictive intake manifold.

Thank you!


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PostPosted: Tue Apr 02, 2019 9:38 pm 
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Location: Just south of Indianapolis
485 hp with the s2000 :)

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PostPosted: Wed Apr 03, 2019 3:23 am 
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A pretty decent measuring stick for EP is ~10lbs/whp. Some cars are more, some are less, but that's in the ballpark.

As for the Integra GSR in EP, I think that's a tough one for two reasons. One, the weight isn't achievable, and two, the intake manifold is less than ideal. At a base weight of 2090lbs, there's no way even a 150lbs driver is going to make that. It's true that the gear ratios could stand to be improved in that trans, so even if you do that and take the 2.5% penalty for it, I still don't think even its new weight of 2142lbs is achievable. And even if someone was able to get that light, I'm not sure they're going to make the ~215whp they'd need to really be competitive, because of the design of that weird dual-runner, butterfly-valve intake manifold, and its 60mm throttle body.

What I'd do if it were me, run the car to the Integra Type R spec instead. It adds 100lbs to the base weight, but you're probably already over by that much anyways. And in return you get the ITR's much better flowing head, intake manifold, and 62mm throttle body. It's base weight is 2190lbs, which a weight-concise build and a sub-200lbs driver could hit. (Both the 2nd and 3rd gen Integra's can be built to ~2000lbs in Prod trim.) The gear ratios of the ITR are also pretty awesome stock, so there wouldn't be any need to change them and take the 2.5% weight hit for it. So if you're able to get the car+driver down to around 2200lbs, you'd need ~220whp to be competitive, which I think is doable with the ITR head, intake manifold, and throttle body. It's an intriguing idea, which I've definitely thought about myself. Plus then you'd also get to run the sweet looking, albeit not very effective, stock ITR wing. :lol:

I see you'll be at VIR. I will too, so hit me up. I love talking about Integra's, and am always willing to help.

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PostPosted: Wed Apr 03, 2019 9:30 am 
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I think EP is anywhere in the 10-11lbs/HP range personally. Keep in mind that's a ~20hp band.

But HP/Weight, while probably 90% of the equation, shouldn't be the only considered factor.

Full disclaimer - I know nothing about Integra's.

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PostPosted: Thu Apr 04, 2019 4:46 pm 
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Kruck-

Thanks so much, this is essentially right where my head was at on this.

Am I allowed to use my c1 block with a type R head set up then slap a wing on and go?


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PostPosted: Fri Apr 05, 2019 3:52 am 
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CoyoteBlack wrote:
Kruck-

Thanks so much, this is essentially right where my head was at on this.

Am I allowed to use my c1 block with a type R head set up then slap a wing on and go?

All B18Cx blocks are completely identical.

Note that if you compete under the ITR spec-line, but still have the GSR gears in your trans, you'll have to take the 2.5% weight penalty for alt gear ratios, regardless of the fact that they're worse for track use. So you'll want to get the ITR gears too.

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PostPosted: Fri Apr 05, 2019 6:19 am 
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kruck wrote:
CoyoteBlack wrote:
Kruck-

Thanks so much, this is essentially right where my head was at on this.

Am I allowed to use my c1 block with a type R head set up then slap a wing on and go?

All B18Cx blocks are completely identical.

Note that if you compete under the ITR spec-line, but still have the GSR gears in your trans, you'll have to take the 2.5% weight penalty for alt gear ratios, regardless of the fact that they're worse for track use. So you'll want to get the ITR gears too.



Hah, well I’ll have to look at getting that transmission too. I do want the better gearing anyhow.

That said, isn’t the b16 head identical to the type r? Much more economical on my end probably too. Since technically that wasn’t in the Integra spec line is that against the rules even though it’s the exact same?


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PostPosted: Fri Apr 05, 2019 11:49 am 
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CoyoteBlack wrote:
That said, isn’t the b16 head identical to the type r?

Yes, except it doesn't have the factory porting. Which is not specified anywhere in any documentation...

The Type R trans is also the same thing as the 1999 Civic Si, just without LSD.


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