WE MADE TARGET WHP!!!! (almost...)

[tom91ita]

40% engine multiplier coming soon! LOL

as i recall, the assumed mulitplier for the ITA honda is already over 40%.

that is, if you take the weight and work backwards, you end up in the 42-44% range, iirc.

[mossaidis]

as i recall, the assumed mulitplier for the ITA honda is already over 40%.

that is, if you take the weight and work backwards, you end up in the 42-44% range, iirc.

I believe 38% for the CRX si D16a6 engine. For the D16z6 (and probably the other VTEC D16's unless in IT it's 25% and for good reason... I have a 10/10th build and I am more or less there, within +/- 1 whp depending on the day, the dyno settings, etc.

Here's the math.

2270 lbs (process weight) - 50 lbs DW adder = 2220 lbs
2220 lbs / 0.98 FWD subractor = 2265 lbs (if unadjusted)
2265 lbs / 14.5 lb/chp ratio = 156.2 chp
156.2chp * 0.85 standard driveline ratio loss = 132.7 process whp

OR

156.2 chp - 125 stock chp = 31.2 chp upgrade via IT allowed mods
31.2 chp / 125 stock chp = 24.96% or ~ 25%

[tom91ita]

I believe 38% for the CRX si D16a6 engine. For the D16z6 (and probably the other VTEC D16's unless in IT it's 25% and for good reason... I have a 10/10th build and I am more or less there, within +/- 1 whp depending on the day, the dyno settings, etc.

Here's the math.

2270 lbs (process weight) - 50 lbs DW adder = 2220 lbs
2220 lbs / 0.98 FWD subractor = 2265 lbs (if unadjusted)
2265 lbs / 14.5 lb/chp ratio = 156.2 chp
156.2chp * 0.85 standard driveline ratio loss = 132.7 process whp

OR

156.2 chp - 125 stock chp = 31.2 chp upgrade via IT allowed mods
31.2 chp / 125 stock chp = 24.96% or ~ 25%

i'll accept your math above that is saying 156.2 Crank HP. but since the 90-91's were rated at 108 hp, then 156.2/108 = 1.446

so call it a 45% multiplier.

nice hp numbers btw. and thanks for sharing.

[mossaidis]

i'll accept your math above that is saying 156.2 Crank HP. but since the 90-91's were rated at 108 hp, then 156.2/108 = 1.446

so call it a 45% multiplier.

nice hp numbers btw. and thanks for sharing.

Tom, those numbers were posted selfishly for my car. Here is the 90-91 Civic/CRX Si/Ex as far as I know it.

2250 lbs (process weight) - 50 lbs DW adder = 2200 lbs
2200 lbs / 0.98 FWD subractor = 2244 lbs (if unadjusted)
2244 lbs / 14.5 lb/chp ratio = 154.8 chp
154.8 chp * 0.85 standard driveline ratio loss = 131.6 process whp

OR

154.8 chp - 108 stock chp = 46.8 chp upgrade via IT allowed mods
46.8 chp / 108 stock chp = 43.3% or ~ 43%

wow, that's crazy though there's probably more weight adders that I am NOT aware of. It's been posted on it.com before lots of time, it was well know that the Honda advertised lower than real chp for the D16a6.

there was a guy that knows a guy that said his CRX Si "did 135whp but on a Dynojet". That second guy was not Moser but another well respected CRX dude. if unaltered that dynojet posted 10% higher than real whp, then perhaps 122whp, about 9 whp below target. My suggestion is to talk to Moser or King Motorsports to see how much they were off the mark. Otherwise, I would call that extra 150 lbs "reward weight" for driving a d16a6. (sorry)