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So I have been debating on building an STS civic.  My question is what kind of horsepower #'s is everyone getting out of the 89-91 Si's? 

10 Hamster Powerz on a caged spinning wheel exercise dyno

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Nick Jackson
04 S2000 - BHP Brakes
71 240z w/some stuff

there have been a couple of threads on this subject, just search this forum. anyway, racing dyno's is pointless but ~115whp is average and will vary by dyno. you don't need the most power or the lightest weight to win either, though it doesn't hurt.

 

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Nate Whipple
NER
188/88 DSP ITR

Different dynos are so different it makes this kind of comparison very hard. You should be looking at something in the 110s or 120s whp on a DynoJet.

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Brian Davis, 89 Civic Si, 158 STS

Here is the dyno plot from my '89 civic si, from a dynojet:

http://www.briangt.com/gallery/sts/sts_dyno?full=1

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89/189 STS/STX '89 Civic Si

On a dynojet, my EG made 125whp/~102wtq.

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Nate Whipple
NER
188/88 DSP ITR

I'm very suprised the EGs are only making about 10 more hp than the EF. Makes me think there is more power to be found in my motor but I've done everything I can to that thing per rules. It's even fully rebuilt bottom end with a new top end.

Macspeed:

I'm very suprised the EGs are only making about 10 more hp than the EF. Makes me think there is more power to be found in my motor but I've done everything I can to that thing per rules. It's even fully rebuilt bottom end with a new top end.

The EF's dont' have to spin the p/s pump. Several hp lost through that pump.The lower peak torque number is a bit misleading because the z6 doesn't get that huge torque spike that the EF gets. Average torque is fairly similar.
 

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Nate Whipple
NER
188/88 DSP ITR

This thread has an overlay of an STS civic with Hytech vs. my D16z6 with a DC 4-2-1 header.

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Nate Whipple
NER
188/88 DSP ITR

My STS Scion makes about 47 from my Black & Decker Aquarium pump.

 

It's a minority in spec civic...

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"Most amateur drivers go too fast in slow corners and too slow in fast
corners"
Emerson Fittipaldi

solo-x:

This thread has an overlay of an STS civic with Hytech vs. my D16z6 with a DC 4-2-1 header.

Funny you brought this up. John at Hytech is one of my customers and I've been talking to him about a header, and I'm currently running a DC. Which header is the STS legal one? I didn't know there was such a thing.

I believe it is just a normal Hytech header with the collector shortened. However, I'm not baller enough to have one to know for sure.

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Nate Whipple
NER
188/88 DSP ITR

Well, here is my disappointing news:

 

 

 

 

 

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125 STS '89 Civic Si
RPGproduction.com/Toyo Tires/Moton/NABC-Ethanol Racing